Use lambda expression to simplify statements

Change-Id: Ib8ddac6e93327ade9d42984d8eba66be7047d051
diff --git a/apps/routing/src/main/java/org/onosproject/routing/bgp/BgpSessionManager.java b/apps/routing/src/main/java/org/onosproject/routing/bgp/BgpSessionManager.java
index 57481c2..ab8a049 100644
--- a/apps/routing/src/main/java/org/onosproject/routing/bgp/BgpSessionManager.java
+++ b/apps/routing/src/main/java/org/onosproject/routing/bgp/BgpSessionManager.java
@@ -300,21 +300,18 @@
         ChannelFactory channelFactory = new NioServerSocketChannelFactory(
                 newCachedThreadPool(groupedThreads("onos/bgp", "sm-boss-%d")),
                 newCachedThreadPool(groupedThreads("onos/bgp", "sm-worker-%d")));
-        ChannelPipelineFactory pipelineFactory = new ChannelPipelineFactory() {
-            @Override
-            public ChannelPipeline getPipeline() throws Exception {
-                // Allocate a new session per connection
-                BgpSession bgpSessionHandler =
-                        new BgpSession(BgpSessionManager.this);
-                BgpFrameDecoder bgpFrameDecoder =
-                        new BgpFrameDecoder(bgpSessionHandler);
+        ChannelPipelineFactory pipelineFactory = () -> {
+            // Allocate a new session per connection
+            BgpSession bgpSessionHandler =
+                    new BgpSession(BgpSessionManager.this);
+            BgpFrameDecoder bgpFrameDecoder =
+                    new BgpFrameDecoder(bgpSessionHandler);
 
-                // Setup the processing pipeline
-                ChannelPipeline pipeline = Channels.pipeline();
-                pipeline.addLast("BgpFrameDecoder", bgpFrameDecoder);
-                pipeline.addLast("BgpSession", bgpSessionHandler);
-                return pipeline;
-            }
+            // Setup the processing pipeline
+            ChannelPipeline pipeline = Channels.pipeline();
+            pipeline.addLast("BgpFrameDecoder", bgpFrameDecoder);
+            pipeline.addLast("BgpSession", bgpSessionHandler);
+            return pipeline;
         };
         InetSocketAddress listenAddress =
                 new InetSocketAddress(bgpPort);