[ONOS-3831,ONOS-3836] Load balance algorithm for sfc

Change-Id: I48a428587420ce6d782c128b835b5bb90e0cacfe

-/*
- * 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.sfc.manager;
-
-import java.util.concurrent.atomic.AtomicInteger;
-
-/**
- * Unique NSH SPI Id generator for NSH header.
- */
-public final class NshSpiIdGenerators {
-
-    private static final AtomicInteger NSH_SPI_ID_GEN = new AtomicInteger();
-    private static final int MAX_NSH_SPI_ID = 0x7FFFFFFF;
-    private static int nshSpiId;
-
-    /**
-     * Default constructor.
-     */
-    private NshSpiIdGenerators() {
-    }
-
-    /**
-     * Get the next NSH SPI id.
-     *
-     * @return NSH SPI id
-     */
-    public static int create() {
-        do {
-            if (nshSpiId >= MAX_NSH_SPI_ID) {
-                if (NSH_SPI_ID_GEN.get() >= MAX_NSH_SPI_ID) {
-                    NSH_SPI_ID_GEN.set(0);
-                }
-            }
-            nshSpiId = NSH_SPI_ID_GEN.incrementAndGet();
-        } while (nshSpiId > MAX_NSH_SPI_ID);
-        return nshSpiId;
-    }
-}

@@ -142,6 +142,14 @@ public final class DefaultPortChain implements PortChain {
     }
 
     @Override
+    public int getLoadBalancePathSize() {
+        if (sfcLoadBalanceIdMap.isEmpty()) {
+            return 0;
+        }
+        return sfcLoadBalanceIdMap.size();
+    }
+
+    @Override
     public Optional<LoadBalanceId> matchPath(List<PortPairId> path) {
 
         LoadBalanceId id = null;

@@ -113,6 +113,13 @@ public interface PortChain {
     List<PortPairId> getLoadBalancePath(FiveTuple fiveTuple);
 
     /**
+     * Get the no of load balance paths created.
+     *
+     * @return size of load balanced paths
+     */
+    int getLoadBalancePathSize();
+
+    /**
      * Match the given path with existing load balanced paths.
      *
      * @param path load balanced path

@@ -142,38 +142,37 @@ public class PortChainResourceTest extends VtnResourceTest {
 
         @Override
         public void addLoadBalancePath(FiveTuple fiveTuple, LoadBalanceId id, List<PortPairId> path) {
-            // TODO Auto-generated method stub
         }
 
         @Override
         public LoadBalanceId getLoadBalanceId(FiveTuple fiveTuple) {
-            // TODO Auto-generated method stub
             return null;
         }
 
         @Override
         public Set<FiveTuple> getLoadBalanceIdMapKeys() {
-            // TODO Auto-generated method stub
             return null;
         }
 
         @Override
         public List<PortPairId> getLoadBalancePath(LoadBalanceId id) {
-            // TODO Auto-generated method stub
             return null;
         }
 
         @Override
         public List<PortPairId> getLoadBalancePath(FiveTuple fiveTuple) {
-            // TODO Auto-generated method stub
             return null;
         }
 
         @Override
         public Optional<LoadBalanceId> matchPath(List<PortPairId> path) {
-            // TODO Auto-generated method stub
             return null;
         }
+
+        @Override
+        public int getLoadBalancePathSize() {
+            return 0;
+        }
     }
 
     /**