[Emu][ONOS-2593, ONOS-2594] BGP SBI controller and session handler

Change-Id: Ia95717ff173b2e3e1198bdd0fafef7cb0aa8f734

@@ -47,288 +47,251 @@ public interface BGPCfg {
     /**
     /**
      * Returns the status of the configuration based on this state certain operations like connection is handled.
      * Returns the status of the configuration based on this state certain operations like connection is handled.
      *
      *
-     * @return
-     *          State of the configuration
+     * @return State of the configuration
      */
      */
     State getState();
     State getState();
 
 
     /**
     /**
      * To set the current state of the configuration.
      * To set the current state of the configuration.
      *
      *
-     * @param state
-     *          Configuration State enum
+     * @param state Configuration State enum
      */
      */
     void setState(State state);
     void setState(State state);
 
 
     /**
     /**
      * Get the status of the link state support for this BGP speaker.
      * Get the status of the link state support for this BGP speaker.
      *
      *
-     * @return
-     *          true if the link state is supported else false
+     * @return  true if the link state is supported else false
      */
      */
     boolean getLsCapability();
     boolean getLsCapability();
 
 
     /**
     /**
      * Set the link state support to this BGP speaker.
      * Set the link state support to this BGP speaker.
      *
      *
-     * @param lscapability
-     *                  true value if link state is supported else false
+     * @param lscapability true value if link state is supported else false
      */
      */
     void setLsCapability(boolean lscapability);
     void setLsCapability(boolean lscapability);
 
 
     /**
     /**
      * Get the status of the 32 bit AS support for this BGP speaker.
      * Get the status of the 32 bit AS support for this BGP speaker.
      *
      *
-     * @return
-     *          true if the 32 bit AS number is supported else false
+     * @return true if the 32 bit AS number is supported else false
      */
      */
     boolean getLargeASCapability();
     boolean getLargeASCapability();
 
 
     /**
     /**
      * Set the 32 bit AS support capability to this BGP speaker.
      * Set the 32 bit AS support capability to this BGP speaker.
      *
      *
-     * @param largeAs
-     *          true value if the 32 bit AS is supported else false
+     * @param largeAs  true value if the 32 bit AS is supported else false
      */
      */
     void setLargeASCapability(boolean largeAs);
     void setLargeASCapability(boolean largeAs);
 
 
     /**
     /**
      * Set the AS number to which this BGP speaker belongs.
      * Set the AS number to which this BGP speaker belongs.
      *
      *
-     * @param localAs
-     *          16 or 32 bit AS number, length is dependent on the capability
+     * @param localAs 16 or 32 bit AS number, length is dependent on the capability
      */
      */
     void setAsNumber(int localAs);
     void setAsNumber(int localAs);
 
 
     /**
     /**
      * Get the AS number to which this BGP speaker belongs.
      * Get the AS number to which this BGP speaker belongs.
      *
      *
-     * @return
-     *          16 or 32 bit AS number, length is dependent on the capability
+     * @return 16 or 32 bit AS number, length is dependent on the capability
      */
      */
     int getAsNumber();
     int getAsNumber();
 
 
     /**
     /**
      * Get the connection retry count number.
      * Get the connection retry count number.
      *
      *
-     * @return
-     *          connection retry count if there is a connection error
+     * @return connection retry count if there is a connection error
      */
      */
     int getMaxConnRetryCount();
     int getMaxConnRetryCount();
 
 
     /**
     /**
      * Set the connection retry count.
      * Set the connection retry count.
      *
      *
-     * @param retryCount
-     *          number of times to try to connect if there is any error
+     * @param retryCount number of times to try to connect if there is any error
      */
      */
     void setMaxConnRetryCout(int retryCount);
     void setMaxConnRetryCout(int retryCount);
 
 
     /**
     /**
      * Get the connection retry time in seconds.
      * Get the connection retry time in seconds.
      *
      *
-     * @return
-     *          connection retry time in seconds
+     * @return connection retry time in seconds
      */
      */
     int getMaxConnRetryTime();
     int getMaxConnRetryTime();
 
 
     /**
     /**
      * Set the connection retry time in seconds.
      * Set the connection retry time in seconds.
      *
      *
-     * @param retryTime
-     *          connection retry times in seconds
+     * @param retryTime connection retry times in seconds
      */
      */
     void setMaxConnRetryTime(int retryTime);
     void setMaxConnRetryTime(int retryTime);
 
 
     /**
     /**
      * Set the keep alive timer for the connection.
      * Set the keep alive timer for the connection.
      *
      *
-     * @param holdTime
-     *          connection hold timer in seconds
+     * @param holdTime connection hold timer in seconds
      */
      */
     void setHoldTime(short holdTime);
     void setHoldTime(short holdTime);
 
 
     /**
     /**
      * Returns the connection hold timer in seconds.
      * Returns the connection hold timer in seconds.
      *
      *
-     * @return
-     *          connection hold timer in seconds
+     * @return connection hold timer in seconds
      */
      */
     short getHoldTime();
     short getHoldTime();
 
 
     /**
     /**
      * Returns the maximum number of session supported.
      * Returns the maximum number of session supported.
      *
      *
-     * @return
-     *          maximum number of session supported
+     * @return maximum number of session supported
      */
      */
     int getMaxSession();
     int getMaxSession();
 
 
     /**
     /**
      * Set the maximum number of sessions to support.
      * Set the maximum number of sessions to support.
      *
      *
-     * @param maxsession
-     *          maximum number of session
+     * @param maxsession maximum number of session
      */
      */
     void setMaxSession(int maxsession);
     void setMaxSession(int maxsession);
 
 
     /**
     /**
      * Returns the Router ID of this BGP speaker.
      * Returns the Router ID of this BGP speaker.
      *
      *
-     * @return
-     *          IP address in string format
+     * @return IP address in string format
      */
      */
     String getRouterId();
     String getRouterId();
 
 
     /**
     /**
      * Set the Router ID of this BGP speaker.
      * Set the Router ID of this BGP speaker.
      *
      *
-     * @param routerid
-     *          IP address in string format
+     * @param routerid  IP address in string format
      */
      */
     void setRouterId(String routerid);
     void setRouterId(String routerid);
 
 
     /**
     /**
      * Add the BGP peer IP address and the AS number to which it belongs.
      * Add the BGP peer IP address and the AS number to which it belongs.
      *
      *
-     * @param routerid
-     *          IP address in string format
-     * @param remoteAs
-     *          AS number to which it belongs
-     * @return
-     *          true if added successfully else false
+     * @param routerid IP address in string format
+     * @param remoteAs  AS number to which it belongs
+     *
+     * @return true if added successfully else false
      */
      */
     boolean addPeer(String routerid, int remoteAs);
     boolean addPeer(String routerid, int remoteAs);
 
 
     /**
     /**
      * Add the BGP peer IP address and the keep alive time.
      * Add the BGP peer IP address and the keep alive time.
      *
      *
-     * @param routerid
-     *          IP address in string format
-     * @param holdTime
-     *          keep alive time for the connection
-     * @return
-     *          true if added successfully else false
+     * @param routerid IP address in string format
+     * @param holdTime keep alive time for the connection
+     *
+     * @return true if added successfully else false
      */
      */
     boolean addPeer(String routerid, short holdTime);
     boolean addPeer(String routerid, short holdTime);
 
 
     /**
     /**
      * Add the BGP peer IP address, the AS number to which it belongs and keep alive time.
      * Add the BGP peer IP address, the AS number to which it belongs and keep alive time.
      *
      *
-     * @param routerid
-     *          IP address in string format
-     * @param remoteAs
-     *          AS number to which it belongs
-     * @param holdTime
-     *          keep alive time for the connection
-     * @return
-     *          true if added successfully else false
+     * @param routerid IP address in string format
+     * @param remoteAs AS number to which it belongs
+     * @param holdTime keep alive time for the connection
+     *
+     * @return  true if added successfully else false
      */
      */
     boolean addPeer(String routerid, int remoteAs, short holdTime);
     boolean addPeer(String routerid, int remoteAs, short holdTime);
 
 
     /**
     /**
      * Remove the BGP peer with this IP address.
      * Remove the BGP peer with this IP address.
      *
      *
-     * @param routerid
-     *          router IP address
-     * @return
-     *          true if removed successfully else false
+     * @param routerid router IP address
+     *
+     * @return true if removed successfully else false
      */
      */
     boolean removePeer(String routerid);
     boolean removePeer(String routerid);
 
 
     /**
     /**
      * Connect to BGP peer with this IP address.
      * Connect to BGP peer with this IP address.
      *
      *
-     * @param routerid
-     *          router IP address
-     * @return
-     *          true of the configuration is found and able to connect else false
+     * @param routerid router IP address
+     *
+     * @return  true of the configuration is found and able to connect else false
      */
      */
     boolean connectPeer(String routerid);
     boolean connectPeer(String routerid);
 
 
     /**
     /**
      * Disconnect this BGP peer with this IP address.
      * Disconnect this BGP peer with this IP address.
      *
      *
-     * @param routerid
-     *          router IP address in string format
-     * @return
-     *          true if the configuration is found and able to disconnect else false
+     * @param routerid  router IP address in string format
+     *
+     * @return true if the configuration is found and able to disconnect else false
      */
      */
     boolean disconnectPeer(String routerid);
     boolean disconnectPeer(String routerid);
 
 
     /**
     /**
      * Returns the peer tree information.
      * Returns the peer tree information.
      *
      *
-     * @return
-     *          return the tree map with IP as key and BGPPeerCfg as object
+     * @return return the tree map with IP as key and BGPPeerCfg as object
      */
      */
     TreeMap<String, BGPPeerCfg> displayPeers();
     TreeMap<String, BGPPeerCfg> displayPeers();
 
 
     /**
     /**
      * Return the BGP Peer information with this matching IP.
      * Return the BGP Peer information with this matching IP.
      *
      *
-     * @param routerid
-     *          router IP address in string format
-     * @return
-     *          BGPPeerCfg object
+     * @param routerid router IP address in string format
+     *
+     * @return BGPPeerCfg object
      */
      */
     BGPPeerCfg displayPeers(String routerid);
     BGPPeerCfg displayPeers(String routerid);
 
 
     /**
     /**
      * Check if this BGP peer is configured.
      * Check if this BGP peer is configured.
      *
      *
-     * @param routerid
-     *          router IP address in string format
-     * @return
-     *          true if configured exists else false
+     * @param routerid  router IP address in string format
+     *
+     * @return  true if configured exists else false
      */
      */
     boolean isPeerConfigured(String routerid);
     boolean isPeerConfigured(String routerid);
 
 
     /**
     /**
      * Check if this BGP speaker is having connection with the peer.
      * Check if this BGP speaker is having connection with the peer.
      *
      *
-     * @param routerid
-     *          router IP address in string format
-     * @return
-     *          true if the connection exists else false
+     * @param routerid router IP address in string format
+     *
+     * @return true if the connection exists else false
      */
      */
     boolean isPeerConnected(String routerid);
     boolean isPeerConnected(String routerid);
 
 
     /**
     /**
      * Return the peer tree map.
      * Return the peer tree map.
      *
      *
-     * @return
-     *          return the tree map with IP as key and BGPPeerCfg as object
+     * @return return the tree map with IP as key and BGPPeerCfg as object
      */
      */
     TreeMap<String, BGPPeerCfg> getPeerTree();
     TreeMap<String, BGPPeerCfg> getPeerTree();
 
 
     /**
     /**
      * Set the current connection state information.
      * Set the current connection state information.
      *
      *
-     * @param routerid
-     *          router IP address in string format
-     * @param state
-     *          state information
+     * @param routerid  router IP address in string format
+     * @param state state information
      */
      */
     void setPeerConnState(String routerid, BGPPeerCfg.State state);
     void setPeerConnState(String routerid, BGPPeerCfg.State state);
 
 
     /**
     /**
      * Check if the peer can be connected or not.
      * Check if the peer can be connected or not.
      *
      *
-     * @param routerid
-     *          router IP address in string format
-     * @return
-     *          true if the peer can be connected else false
+     * @param routerid  router IP address in string format
+     *
+     * @return  true if the peer can be connected else false
      */
      */
     boolean isPeerConnectable(String routerid);
     boolean isPeerConnectable(String routerid);
 
 
     /**
     /**
      * Get the current peer connection state information.
      * Get the current peer connection state information.
      *
      *
-     * @param routerid
-     *          router IP address in string format
-     * @return
-     *          state information
+     * @param routerid router IP address in string format
+     *
+     * @return state information
      */
      */
     BGPPeerCfg.State getPeerConnState(String routerid);
     BGPPeerCfg.State getPeerConnState(String routerid);
 }
 }

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.bgp.controller;
+
+import org.onosproject.bgpio.protocol.BGPMessage;
+
+/**
+ * Abstraction of an BGP controller. Serves as a one stop shop for obtaining BGP devices and (un)register listeners
+ * on bgp events
+ */
+public interface BGPController {
+
+    /**
+     * Send a message to a particular bgp peer.
+     *
+     * @param bgpId the id of the peer to send message.
+     * @param msg the message to send
+     */
+    void writeMsg(BGPId bgpId, BGPMessage msg);
+
+    /**
+     * Process a message and notify the appropriate listeners.
+     *
+     * @param bgpId id of the peer the message arrived on
+     * @param msg the message to process.
+     */
+    void processBGPPacket(BGPId bgpId, BGPMessage msg);
+
+    /**
+     * Get the BGPConfig class to the caller.
+     *
+     * @return configuration object
+     */
+    BGPCfg getConfig();
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.bgp.controller;
+
+import org.onlab.packet.IpAddress;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.Objects;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+/**
+ * The class representing a network peer bgp ip.
+ * This class is immutable.
+ */
+public final class BGPId {
+
+    private static final String SCHEME = "bgp";
+    private static final long UNKNOWN = 0;
+    private final IpAddress ipAddress;
+
+    /**
+     * Private constructor.
+     */
+    private BGPId(IpAddress ipAddress) {
+        this.ipAddress = ipAddress;
+    }
+
+    /**
+     * Create a BGPId from ip address.
+     *
+     * @param ipAddress IP address
+     * @return object of BGPId
+     */
+    public static BGPId bgpId(IpAddress ipAddress) {
+        return new BGPId(ipAddress);
+    }
+
+    /**
+     * Returns the ip address.
+     *
+     * @return ipAddress
+     */
+    public IpAddress ipAddress() {
+        return ipAddress;
+    }
+
+    /**
+     * Convert the BGPId value to a ':' separated hexadecimal string.
+     *
+     * @return the BGPId value as a ':' separated hexadecimal string.
+     */
+    @Override
+    public String toString() {
+        return ipAddress.toString();
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if (!(other instanceof BGPId)) {
+            return false;
+        }
+
+        BGPId otherBGPid = (BGPId) other;
+        return Objects.equals(ipAddress, otherBGPid.ipAddress);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(ipAddress);
+    }
+
+    /**
+     * Returns BGPId created from the given device URI.
+     *
+     * @param uri device URI
+     * @return object of BGPId
+     */
+    public static BGPId bgpId(URI uri) {
+        checkArgument(uri.getScheme().equals(SCHEME), "Unsupported URI scheme");
+        return new BGPId(IpAddress.valueOf(uri.getSchemeSpecificPart()));
+    }
+
+    /**
+     * Produces device URI from the given DPID.
+     *
+     * @param bgpId device bgpId
+     * @return device URI
+     */
+    public static URI uri(BGPId bgpId) {
+        return uri(bgpId.ipAddress());
+    }
+
+    /**
+     * Produces device URI from the given DPID long.
+     *
+     * @param ipAddress device ip address
+     * @return device URI
+     */
+    public static URI uri(IpAddress ipAddress) {
+        try {
+            return new URI(SCHEME, ipAddress.toString(), null);
+        } catch (URISyntaxException e) {
+            return null;
+        }
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.bgp.controller;
+
+/**
+ * A representation of a packet context which allows any provider to view a packet in event, but may block the response
+ * to the event if blocked has been called. This packet context can be used to react to the packet in event with a
+ * packet out.
+ */
+public interface BGPPacketStats {
+    /**
+     * Returns the count for no of packets sent out.
+     *
+     * @return int value of no of packets sent
+     */
+    int outPacketCount();
+
+    /**
+     * Returns the count for no of packets received.
+     *
+     * @return int value of no of packets sent
+     */
+    int inPacketCount();
+
+    /**
+     * Returns the count for no of wrong packets received.
+     *
+     * @return int value of no of wrong packets received
+     */
+    int wrongPacketCount();
+
+    /**
+     * Returns the time.
+     *
+     * @return the time
+     */
+    long getTime();
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.bgpio.exceptions;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+
+/**
+ * Custom Exception for BGP IO.
+ */
+public class BGPParseException extends Exception {
+
+    private static final long serialVersionUID = 1L;
+    private byte errorCode;
+    private byte errorSubCode;
+    private ChannelBuffer data;
+
+    /**
+     * Default constructor to create a new exception.
+     */
+    public BGPParseException() {
+        super();
+    }
+
+    /**
+     * Constructor to create exception from message and cause.
+     *
+     * @param message  the detail of exception in string
+     * @param cause underlying cause of the error
+     */
+    public BGPParseException(final String message, final Throwable cause) {
+        super(message, cause);
+    }
+
+    /**
+     * Constructor to create exception from message.
+     *
+     * @param message the detail of exception in string
+     */
+    public BGPParseException(final String message) {
+        super(message);
+    }
+
+    /**
+     * Constructor to create exception from cause.
+     *
+     * @param cause underlying cause of the error
+     */
+    public BGPParseException(final Throwable cause) {
+        super(cause);
+    }
+
+    /**
+     * Constructor to create exception from error code and error subcode.
+     *
+     * @param errorCode error code of BGP message
+     * @param errorSubCode error subcode of BGP message
+     * @param data error data of BGP message
+     */
+    public BGPParseException(final byte errorCode, final byte errorSubCode, final ChannelBuffer data) {
+        super();
+        this.errorCode = errorCode;
+        this.errorSubCode = errorSubCode;
+        this.data = data;
+    }
+
+    /**
+     * Returns errorcode for this exception.
+     *
+     * @return errorcode for this exception
+     */
+    public byte getErrorCode() {
+        return this.errorCode;
+    }
+
+    /**
+     * Returns error Subcode for this exception.
+     *
+     * @return error Subcode for this exception
+     */
+    public byte getErrorSubCode() {
+        return this.errorSubCode;
+    }
+
+    /**
+     * Returns error data for this exception.
+     *
+     * @return error data for this exception
+     */
+    public ChannelBuffer getData() {
+        return this.data;
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.bgpio.protocol;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.bgpio.exceptions.BGPParseException;
+import org.onosproject.bgpio.types.BGPHeader;
+
+/**
+ * Abstraction of an entity providing BGP Messages.
+ */
+public interface BGPMessage extends Writeable {
+    /**
+     * Returns BGP Header of BGP Message.
+     *
+     * @return BGP Header of BGP Message
+     */
+    BGPHeader getHeader();
+
+    /**
+     * Returns version of BGP Message.
+     *
+     * @return version of BGP Message
+     */
+    BGPVersion getVersion();
+
+    /**
+     * Returns BGP Type of BGP Message.
+     *
+     * @return BGP Type of BGP Message
+     */
+    BGPType getType();
+
+    @Override
+    void writeTo(ChannelBuffer cb) throws BGPParseException;
+
+    /**
+     * Builder interface with get and set functions to build BGP Message.
+     */
+    interface Builder {
+        /**
+         * Builds BGP Message.
+         *
+         * @return BGP Message
+         * @throws BGPParseException while building bgp message
+         */
+        BGPMessage build() throws BGPParseException;
+
+        /**
+         * Returns BGP Version of BGP Message.
+         *
+         * @return BGP Version of BGP Message
+         */
+        BGPVersion getVersion();
+
+        /**
+         * Returns BGP Type of BGP Message.
+         *
+         * @return BGP Type of BGP Message
+         */
+        BGPType getType();
+
+        /**
+         * Returns BGP Header of BGP Message.
+         *
+         * @return BGP Header of BGP Message
+         */
+        BGPHeader getHeader();
+
+        /**
+         * Sets BgpHeader and return its builder.
+         *
+         * @param bgpMsgHeader BGP Message Header
+         * @return builder by setting BGP message header
+         */
+        Builder setHeader(BGPHeader bgpMsgHeader);
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.bgpio.protocol;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.bgpio.exceptions.BGPParseException;
+import org.onosproject.bgpio.types.BGPHeader;
+
+/**
+ * Abstraction of an entity providing BGP Message Reader.
+ */
+public interface BGPMessageReader<T> {
+
+    /**
+     * Reads the Objects in the BGP Message and Returns BGP Message.
+     *
+     * @param cb Channel Buffer
+     * @param bgpHeader BGP message header
+     * @return BGP Message
+     * @throws BGPParseException while parsing BGP message.
+     */
+    T readFrom(ChannelBuffer cb, BGPHeader bgpHeader) throws BGPParseException;
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.bgpio.protocol;
+
+/**
+ * Enum to Provide the Different types of BGP messages.
+ */
+public enum BGPType {
+
+    NONE(0), OPEN(1), UPDATE(2), NOTIFICATION(3), KEEP_ALIVE(4);
+
+    int value;
+
+    /**
+     * Assign value with the value val as the types of BGP message.
+     *
+     * @param val type of BGP message
+     */
+    BGPType(int val) {
+        value = val;
+    }
+
+    /**
+     * Returns value as type of BGP message.
+     *
+     * @return value type of BGP message
+     */
+    public byte getType() {
+        return (byte) value;
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.bgpio.protocol;
+
+/**
+ * Enum to provide BGP Message Version.
+ */
+public enum BGPVersion {
+
+    BGP_4(4);
+
+    public final int packetVersion;
+
+    /**
+     * Assign BGP PacketVersion with specified packetVersion.
+     *
+     * @param packetVersion version of BGP
+     */
+    BGPVersion(final int packetVersion) {
+        this.packetVersion = packetVersion;
+    }
+
+    /**
+     * Returns Packet version of BGP Message.
+     *
+     * @return packetVersion
+     */
+    public int getPacketVersion() {
+        return packetVersion;
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.bgpio.protocol;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.bgpio.exceptions.BGPParseException;
+
+/**
+ * Abstraction of an entity providing functionality to write byte streams of
+ * Messages to channel buffer.
+ */
+public interface Writeable {
+
+    /**
+     * Writes byte streams of messages to channel buffer.
+     *
+     * @param cb channelBuffer
+     * @throws BGPParseException when error occurs while writing BGP message to channel buffer
+     */
+    void writeTo(ChannelBuffer cb) throws BGPParseException;
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.bgpio.types;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Provides BGP Message Header which is common for all the Messages.
+ */
+
+public class BGPHeader {
+
+    /*      0                   1                   2                   3
+          0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+          +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+          |                                                               |
+          +                                                               +
+          |                                                               |
+          +                                                               +
+          |                           Marker                              |
+          +                                                               +
+          |                                                               |
+          +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+          |          Length               |      Type     |
+          +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    */
+
+    protected static final Logger log = LoggerFactory.getLogger(BGPHeader.class);
+
+    public static final int MARKER_LENGTH = 16;
+    public static final short DEFAULT_HEADER_LENGTH = 19;
+
+    private byte[] marker;
+    private byte type;
+    private short length;
+
+    /**
+     * Reset fields.
+     */
+    public BGPHeader() {
+        this.marker = null;
+        this.length = 0;
+        this.type = 0;
+    }
+
+    /**
+     * Constructors to initialize parameters.
+     *
+     * @param marker field in BGP header
+     * @param length message length
+     * @param type message type
+     */
+    public BGPHeader(byte[] marker, short length, byte type) {
+        this.marker = marker;
+        this.length = length;
+        this.type = type;
+    }
+
+    /**
+     * Sets marker field.
+     *
+     * @param value marker field
+     */
+    public void setMarker(byte[] value) {
+        this.marker = value;
+    }
+
+    /**
+     * Sets message type.
+     *
+     * @param value message type
+     */
+    public void setType(byte value) {
+        this.type = value;
+    }
+
+    /**
+     * Sets message length.
+     *
+     * @param value message length
+     */
+    public void setLength(short value) {
+        this.length = value;
+    }
+
+    /**
+     * Returns message length.
+     *
+     * @return message length
+     */
+    public short getLength() {
+        return this.length;
+    }
+
+    /**
+     * Returns message marker.
+     *
+     * @return message marker
+     */
+    public byte[] getMarker() {
+        return this.marker;
+    }
+
+    /**
+     * Returns message type.
+     *
+     * @return message type
+     */
+    public byte getType() {
+        return this.type;
+    }
+
+    /**
+     * Writes Byte stream of BGP header to channel buffer.
+     *
+     * @param cb ChannelBuffer
+     * @return length index of message header
+     */
+    public int write(ChannelBuffer cb) {
+
+        cb.writeBytes(getMarker(), 0, MARKER_LENGTH);
+
+        int headerLenIndex = cb.writerIndex();
+        cb.writeShort((short) 0);
+        cb.writeByte(type);
+
+        return headerLenIndex;
+    }
+
+    /**
+     * Read from channel buffer and Returns BGP header.
+     *
+     * @param cb ChannelBuffer
+     * @return object of BGPHeader
+     */
+    public static BGPHeader read(ChannelBuffer cb) {
+
+        byte[] marker = new byte[MARKER_LENGTH];
+        byte type;
+        short length;
+        cb.readBytes(marker, 0, MARKER_LENGTH);
+        length = cb.readShort();
+        type = cb.readByte();
+        return new BGPHeader(marker, length, type);
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.bgpio.types;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+
+/**
+ * Abstraction which Provides the BGP of TLV format.
+ */
+public interface BGPValueType {
+    /**
+     * Returns the Type of BGP Message.
+     *
+     * @return short value of type
+     */
+    short getType();
+
+    /**
+     * Writes the byte Stream of BGP Message to channel buffer.
+     *
+     * @param cb channel buffer
+     * @return length written to channel buffer
+     */
+    int write(ChannelBuffer cb);
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.bgp.controller.impl;
+
+import org.jboss.netty.handler.timeout.IdleStateAwareChannelHandler;
+
+/**
+ * Channel handler deals with the bgp peer connection and dispatches messages from peer to the appropriate locations.
+ */
+class BGPChannelHandler extends IdleStateAwareChannelHandler {
+
+    // TODO: implement FSM and session handling mechanism
+    /**
+     * Create a new unconnected BGPChannelHandler.
+     *
+     * @param bgpCtrlImpl bgp controller implementation object
+     */
+    BGPChannelHandler(BGPControllerImpl bgpCtrlImpl) {
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.bgp.controller.impl;
+
+import static org.onlab.util.Tools.groupedThreads;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Service;
+import org.onosproject.bgp.controller.BGPCfg;
+import org.onosproject.bgp.controller.BGPController;
+import org.onosproject.bgp.controller.BGPId;
+import org.onosproject.bgpio.protocol.BGPMessage;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+@Component(immediate = true)
+@Service
+public class BGPControllerImpl implements BGPController {
+
+    private static final Logger log = LoggerFactory.getLogger(BGPControllerImpl.class);
+
+    private final ExecutorService executorMsgs = Executors.newFixedThreadPool(32,
+                                                                              groupedThreads("onos/bgp",
+                                                                                      "event-stats-%d"));
+
+    private final ExecutorService executorBarrier = Executors.newFixedThreadPool(4,
+                                                                                 groupedThreads("onos/bgp",
+                                                                                         "event-barrier-%d"));
+
+    final Controller ctrl = new Controller(this);
+
+    private BGPConfig bgpconfig = new BGPConfig();
+
+    @Activate
+    public void activate() {
+        this.ctrl.start();
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        // Close all connected peers
+        this.ctrl.stop();
+        log.info("Stopped");
+    }
+
+    @Override
+    public void writeMsg(BGPId bgpId, BGPMessage msg) {
+        // TODO: Send message
+    }
+
+    @Override
+    public void processBGPPacket(BGPId bgpId, BGPMessage msg) {
+
+        switch (msg.getType()) {
+        case OPEN:
+            // TODO: Process Open message
+            break;
+        case KEEP_ALIVE:
+            // TODO: Process keepalive message
+            break;
+        case NOTIFICATION:
+            // TODO: Process notificatoin message
+            break;
+        case UPDATE:
+            // TODO: Process update message
+            break;
+        default:
+            // TODO: Process other message
+            break;
+        }
+    }
+
+    /**
+     * Get controller instance.
+     *
+     * @return ctrl the controller.
+     */
+    public Controller getController() {
+        return ctrl;
+    }
+
+    @Override
+    public BGPCfg getConfig() {
+        return this.bgpconfig;
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.bgp.controller.impl;
+
+import java.util.LinkedList;
+import java.util.List;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.frame.FrameDecoder;
+import org.onosproject.bgpio.protocol.BGPMessage;
+import org.onlab.util.HexDump;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Decode an bgp message from a Channel, for use in a netty pipeline.
+ */
+public class BGPMessageDecoder extends FrameDecoder {
+
+    protected static final Logger log = LoggerFactory.getLogger(BGPMessageDecoder.class);
+
+    @Override
+    protected Object decode(ChannelHandlerContext ctx, Channel channel, ChannelBuffer buffer) throws Exception {
+
+        List<BGPMessage> msgList = new LinkedList<BGPMessage>();
+
+        log.debug("MESSAGE IS RECEIVED.");
+        if (!channel.isConnected()) {
+            log.info("Channel is not connected.");
+            return null;
+        }
+
+        HexDump.dump(buffer);
+
+        // TODO: decode bgp messages
+        return msgList;
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.bgp.controller.impl;
+
+import java.util.List;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.oneone.OneToOneEncoder;
+import org.onosproject.bgpio.protocol.BGPMessage;
+import org.onlab.util.HexDump;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Encode an bgp message for output into a ChannelBuffer, for use in a
+ * netty pipeline.
+ */
+public class BGPMessageEncoder extends OneToOneEncoder {
+    protected static final Logger log = LoggerFactory.getLogger(BGPMessageEncoder.class);
+
+    @Override
+    protected Object encode(ChannelHandlerContext ctx, Channel channel, Object msg) throws Exception {
+        log.debug("BGPMessageEncoder::encode");
+        if (!(msg instanceof List)) {
+            log.debug("Invalid msg.");
+            return msg;
+        }
+
+        @SuppressWarnings("unchecked")
+        List<BGPMessage> msglist = (List<BGPMessage>) msg;
+
+        ChannelBuffer buf = ChannelBuffers.dynamicBuffer();
+
+        log.debug("SENDING MESSAGE");
+        for (BGPMessage pm : msglist) {
+            pm.writeTo(buf);
+        }
+
+        HexDump.dump(buf);
+
+        return buf;
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.bgp.controller.impl;
+
+import org.onosproject.bgp.controller.BGPPacketStats;
+
+/**
+ * A representation of a packet context which allows any provider
+ * to view a packet in event, but may block the response to the
+ * event if blocked has been called. This packet context can be used
+ * to react to the packet in event with a packet out.
+ */
+public class BGPPacketStatsImpl implements BGPPacketStats {
+
+    private int inPacketCount;
+    private int outPacketCount;
+    private int wrongPacketCount;
+    private long time;
+
+    /**
+     * Resets parameter.
+     */
+    public BGPPacketStatsImpl() {
+        this.inPacketCount = 0;
+        this.outPacketCount = 0;
+        this.wrongPacketCount = 0;
+        this.time = 0;
+    }
+
+    /**
+     * Get the outgoing packet count number.
+     *
+     * @return
+     *          packet count
+     */
+    public int outPacketCount() {
+        return outPacketCount;
+    }
+
+    /**
+     * Get the incoming packet count number.
+     *
+     * @return
+     *          packet count
+     */
+    public int inPacketCount() {
+        return inPacketCount;
+    }
+
+    /**
+     * Get the wrong packet count number.
+     *
+     * @return
+     *          packet count
+     */
+    public int wrongPacketCount() {
+        return wrongPacketCount;
+    }
+
+    /**
+     * Increments the received packet counter.
+     */
+    public void addInPacket() {
+        this.inPacketCount++;
+    }
+
+    /**
+     * Increments the sent packet counter.
+     */
+    public void addOutPacket() {
+        this.outPacketCount++;
+    }
+
+    /**
+     * Increments the sent packet counter by specified value.
+     *
+     * @param value of no of packets sent
+     */
+    public void addOutPacket(int value) {
+        this.outPacketCount = this.outPacketCount + value;
+    }
+
+    /**
+     * Increments the wrong packet counter.
+     */
+    public void addWrongPacket() {
+        this.wrongPacketCount++;
+    }
+
+    /**
+     * Resets wrong packet count.
+     */
+    public void resetWrongPacket() {
+        this.wrongPacketCount = 0;
+    }
+
+    /**
+     * Get the time.
+     *
+     * @return
+     *          time
+     */
+    public long getTime() {
+        return this.time;
+    }
+
+    /**
+     * Sets the time.
+     *
+     * @param time value to set
+     */
+    public void setTime(long time) {
+        this.time = time;
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.bgp.controller.impl;
+
+import org.jboss.netty.channel.ChannelPipeline;
+import org.jboss.netty.channel.ChannelPipelineFactory;
+import org.jboss.netty.channel.Channels;
+import org.jboss.netty.handler.timeout.ReadTimeoutHandler;
+import org.jboss.netty.util.ExternalResourceReleasable;
+import org.jboss.netty.util.HashedWheelTimer;
+import org.jboss.netty.util.Timer;
+
+/**
+ * Creates a ChannelPipeline for a server-side bgp channel.
+ */
+public class BGPPipelineFactory
+    implements ChannelPipelineFactory, ExternalResourceReleasable {
+
+    static final Timer TIMER = new HashedWheelTimer();
+    protected ReadTimeoutHandler readTimeoutHandler;
+    BGPControllerImpl bgpCtrlImpl;
+
+    /**
+     * Constructor to initialize the values.
+     *
+     * @param ctrlImpl parent ctrlImpl
+     * @param isServBgp if it is a server or not
+     */
+    public BGPPipelineFactory(BGPControllerImpl ctrlImpl, boolean isServBgp) {
+        super();
+        bgpCtrlImpl = ctrlImpl;
+        /* hold time*/
+        readTimeoutHandler = new ReadTimeoutHandler(TIMER, bgpCtrlImpl.getConfig().getHoldTime());
+    }
+
+    @Override
+    public ChannelPipeline getPipeline() throws Exception {
+        BGPChannelHandler handler = new BGPChannelHandler(bgpCtrlImpl);
+
+        ChannelPipeline pipeline = Channels.pipeline();
+        pipeline.addLast("bgpmessagedecoder", new BGPMessageDecoder());
+        pipeline.addLast("bgpmessageencoder", new BGPMessageEncoder());
+        pipeline.addLast("holdTime", readTimeoutHandler);
+        pipeline.addLast("PassiveHandler", handler);
+
+        return pipeline;
+    }
+
+    @Override
+    public void releaseExternalResources() {
+        TIMER.stop();
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.bgp.controller.impl;
+
+import static org.onlab.util.Tools.groupedThreads;
+
+import java.lang.management.ManagementFactory;
+import java.lang.management.RuntimeMXBean;
+import java.net.InetSocketAddress;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.Executors;
+
+import org.jboss.netty.bootstrap.ServerBootstrap;
+import org.jboss.netty.channel.ChannelPipelineFactory;
+import org.jboss.netty.channel.group.ChannelGroup;
+import org.jboss.netty.channel.group.DefaultChannelGroup;
+import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * The main controller class. Handles all setup and network listeners - Distributed ownership control of bgp peer
+ * through IControllerRegistryService
+ */
+public class Controller {
+
+    protected static final Logger log = LoggerFactory.getLogger(Controller.class);
+
+    private ChannelGroup cg;
+
+    // Configuration options
+    private static final short BGP_PORT_NUM = 179;
+    private int workerThreads = 16;
+
+    // Start time of the controller
+    protected long systemStartTime;
+
+    private NioServerSocketChannelFactory serverExecFactory;
+
+    // Perf. related configuration
+    protected static final int SEND_BUFFER_SIZE = 4 * 1024 * 1024;
+
+    BGPControllerImpl bgpCtrlImpl;
+
+    /**
+     * Constructor to initialize parameter.
+     *
+     * @param bgpCtrlImpl BGP controller Impl instance
+     */
+    public Controller(BGPControllerImpl bgpCtrlImpl) {
+        this.bgpCtrlImpl = bgpCtrlImpl;
+    }
+
+    // ***************
+    // Getters/Setters
+    // ***************
+
+    /**
+     * To get system start time.
+     *
+     * @return system start time in milliseconds
+     */
+    public long getSystemStartTime() {
+        return (this.systemStartTime);
+    }
+
+    // **************
+    // Initialization
+    // **************
+
+    /**
+     * Tell controller that we're ready to accept bgp peer connections.
+     */
+    public void run() {
+
+        try {
+            final ServerBootstrap bootstrap = createServerBootStrap();
+
+            bootstrap.setOption("reuseAddr", true);
+            bootstrap.setOption("child.keepAlive", true);
+            bootstrap.setOption("child.tcpNoDelay", true);
+            bootstrap.setOption("child.sendBufferSize", Controller.SEND_BUFFER_SIZE);
+
+            ChannelPipelineFactory pfact = new BGPPipelineFactory(bgpCtrlImpl, true);
+
+            bootstrap.setPipelineFactory(pfact);
+            InetSocketAddress sa = new InetSocketAddress(getBgpPortNum());
+            cg = new DefaultChannelGroup();
+            cg.add(bootstrap.bind(sa));
+            log.info("Listening for Peer connection on {}", sa);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    /**
+     * Creates server boot strap.
+     *
+     * @return ServerBootStrap
+     */
+    private ServerBootstrap createServerBootStrap() {
+
+        if (workerThreads == 0) {
+            serverExecFactory = new NioServerSocketChannelFactory(
+                                    Executors.newCachedThreadPool(groupedThreads("onos/bgp", "boss-%d")),
+                                    Executors.newCachedThreadPool(groupedThreads("onos/bgp", "worker-%d")));
+            return new ServerBootstrap(serverExecFactory);
+        } else {
+            serverExecFactory = new NioServerSocketChannelFactory(
+                                    Executors.newCachedThreadPool(groupedThreads("onos/bgp", "boss-%d")),
+                                    Executors.newCachedThreadPool(groupedThreads("onos/bgp", "worker-%d")),
+                                                                  workerThreads);
+            return new ServerBootstrap(serverExecFactory);
+        }
+    }
+
+    /**
+     * Initialize internal data structures.
+     */
+    public void init() {
+        // These data structures are initialized here because other
+        // module's startUp() might be called before ours
+        this.systemStartTime = System.currentTimeMillis();
+    }
+
+    // **************
+    // Utility methods
+    // **************
+
+    public Map<String, Long> getMemory() {
+        Map<String, Long> m = new HashMap<>();
+        Runtime runtime = Runtime.getRuntime();
+        m.put("total", runtime.totalMemory());
+        m.put("free", runtime.freeMemory());
+        return m;
+    }
+
+    public Long getUptime() {
+        RuntimeMXBean rb = ManagementFactory.getRuntimeMXBean();
+        return rb.getUptime();
+    }
+
+    /**
+     * Starts the BGP controller.
+     */
+    public void start() {
+        log.info("Started");
+        this.init();
+        this.run();
+    }
+
+    /**
+     * Stops the BGP controller.
+     */
+    public void stop() {
+        log.info("Stopped");
+        serverExecFactory.shutdown();
+        cg.close();
+    }
+
+    /**
+     * Returns port number.
+     *
+     * @return port number
+     */
+    public static short getBgpPortNum() {
+        return BGP_PORT_NUM;
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onlab.util;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * HexDump class an utility to dump buffer in hex format.
+ */
+public final class HexDump {
+    protected static final Logger log = LoggerFactory.getLogger(HexDump.class);
+
+    private HexDump() {
+    }
+
+    /**
+     * Dump the buffer content in hex format.
+     *
+     * @param buff buffer content to dump in hex format
+     */
+    public static void dump(ChannelBuffer buff) {
+        try {
+            byte[] yTemp;
+            yTemp = buff.array();
+
+            int iStartIndex = buff.readerIndex();
+            int iEndIndex = buff.writerIndex();
+            do {
+                StringBuilder sb = new StringBuilder();
+                for (int k = 0; (k < 16) && (iStartIndex < iEndIndex); ++k) {
+                    if (0 == k % 4) {
+                        sb.append(String.format(" ")); // blank after 4 bytes
+                    }
+                    sb.append(String.format("%02X ", yTemp[iStartIndex++]));
+                }
+                log.debug(sb.toString());
+            } while (iStartIndex < iEndIndex);
+        } catch (Exception e) {
+            log.error("[HexDump] Invalid buffer: " + e.toString());
+        }
+    }
+}