Added skeleton for Netconf Flow Rule Provider.

Change-Id: Iee4389f897c438aa6cda50fb48079fdd0baefe8a

+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Copyright 2014 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.
+  -->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.onosproject</groupId>
+        <artifactId>onos-netconf-providers</artifactId>
+        <version>1.2.0-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <artifactId>onos-netconf-provider-flow</artifactId>
+    <packaging>bundle</packaging>
+
+    <description>ONOS Netconf protocol flow provider</description>
+
+</project>

+/*
+ * 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.provider.netconf.flow.impl;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.util.Collections;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.TimeUnit;
+
+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.Modified;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.jboss.netty.util.HashedWheelTimer;
+import org.jboss.netty.util.Timeout;
+import org.jboss.netty.util.TimerTask;
+import org.onlab.util.Timer;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.flow.FlowEntry;
+import org.onosproject.net.flow.FlowRule;
+import org.onosproject.net.flow.FlowRuleBatchOperation;
+import org.onosproject.net.flow.FlowRuleProvider;
+import org.onosproject.net.flow.FlowRuleProviderRegistry;
+import org.onosproject.net.flow.FlowRuleProviderService;
+import org.onosproject.net.provider.AbstractProvider;
+import org.onosproject.net.provider.ProviderId;
+import org.slf4j.Logger;
+/**
+ * Netconf provider to accept any flow and report them.
+ */
+@Component(immediate = true)
+public class NetconfFlowRuleProvider extends AbstractProvider
+        implements FlowRuleProvider {
+
+    private final Logger log = getLogger(getClass());
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected FlowRuleProviderRegistry providerRegistry;
+
+    private ConcurrentMap<DeviceId, Set<FlowEntry>> flowTable = new ConcurrentHashMap<>();
+
+    private FlowRuleProviderService providerService;
+
+    private HashedWheelTimer timer = Timer.getTimer();
+    private Timeout timeout;
+
+    public NetconfFlowRuleProvider() {
+        super(new ProviderId("null", "org.onosproject.provider.nil"));
+    }
+
+    @Activate
+    public void activate() {
+        providerService = providerRegistry.register(this);
+        timeout = timer.newTimeout(new StatisticTask(), 5, TimeUnit.SECONDS);
+        applyRule();
+
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        providerRegistry.unregister(this);
+        providerService = null;
+        timeout.cancel();
+
+        log.info("Stopped");
+    }
+
+    @Modified
+    public void modified() {
+        applyRule();
+
+    }
+
+    @Override
+    public void applyFlowRule(FlowRule... flowRules) {
+        // String editXml=parser will take schema and flowrule object to build
+        // xml
+        // execute xml command using JNC client
+    }
+
+    @Override
+    public void removeFlowRule(FlowRule... flowRules) {
+        // String editXml=parser will take schema and flowrule object to build
+        // xml
+        // execute xml command using JNC client
+    }
+
+    private void applyRule() {
+        // applyFlowRule(flowRules);//currentl
+    }
+
+    @Override
+    public void removeRulesById(ApplicationId id, FlowRule... flowRules) {
+        log.info("removal by app id not supported in null provider");
+    }
+
+    @Override
+    public void executeBatch(FlowRuleBatchOperation batch) {
+
+    }
+
+    private class StatisticTask implements TimerTask {
+
+        @Override
+        public void run(Timeout to) throws Exception {
+            for (DeviceId devId : flowTable.keySet()) {
+                providerService.pushFlowMetrics(devId, flowTable
+                        .getOrDefault(devId, Collections.emptySet()));
+            }
+            timeout = timer.newTimeout(to.getTask(), 5, TimeUnit.SECONDS);
+
+        }
+    }
+}

+/*
+ * Copyright 2014 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.
+ */
+
+/**
+ * Provider that will accept any flow rules.
+ */
+package org.onosproject.provider.netconf.flow.impl;
+