Initial clustering feature

[controller.git] / opendaylight / md-sal / sal-rest-connector / src / main / java / org / opendaylight / controller / sal / streams / websockets / WebSocketServer.java

diff --git a/opendaylight/md-sal/sal-rest-connector/src/main/java/org/opendaylight/controller/sal/streams/websockets/WebSocketServer.java b/opendaylight/md-sal/sal-rest-connector/src/main/java/org/opendaylight/controller/sal/streams/websockets/WebSocketServer.java
index 67ed44f84ea86020b54553f3f0b4f108e4ada66f..0a5f5f0ff03be26086ede6a78d3ba2dd156e812c 100644 (file)
--- a/opendaylight/md-sal/sal-rest-connector/src/main/java/org/opendaylight/controller/sal/streams/websockets/WebSocketServer.java
+++ b/opendaylight/md-sal/sal-rest-connector/src/main/java/org/opendaylight/controller/sal/streams/websockets/WebSocketServer.java
@@ -16,11 +16,10 @@ import org.slf4j.LoggerFactory;
 public class WebSocketServer implements Runnable {
 
     private static final Logger logger = LoggerFactory.getLogger(WebSocketServer.class);
-    public static final String WEBSOCKET_SERVER_CONFIG_PROPERTY = "restconf.websocket.port";
     public static final int DEFAULT_PORT = 8181;
     private EventLoopGroup bossGroup;
     private EventLoopGroup workerGroup;
-    private static WebSocketServer singleton = null;
+    private static WebSocketServer instance = null;
     private int port = DEFAULT_PORT;
 
     private WebSocketServer(int port) {
@@ -35,14 +34,11 @@ public class WebSocketServer implements Runnable {
      * @return instance of {@link WebSocketServer}
      */
     public static WebSocketServer createInstance(int port) {
-        if (singleton != null) {
-            throw new IllegalStateException("createInstance() has already been called");
-        }
-        if (port < 1024) {
-            throw new IllegalArgumentException("Privileged port (below 1024) is not allowed");
-        }
-        singleton = new WebSocketServer(port);
-        return singleton;
+        Preconditions.checkState(instance == null, "createInstance() has already been called");
+        Preconditions.checkArgument(port > 1024, "Privileged port (below 1024) is not allowed");
+
+        instance = new WebSocketServer(port);
+        return instance;
     }
 
     /**
@@ -58,18 +54,18 @@ public class WebSocketServer implements Runnable {
      * @return instance of {@link WebSocketServer}
      */
     public static WebSocketServer getInstance() {
-        Preconditions.checkNotNull(singleton, "createInstance() must be called prior to getInstance()");
-        return singleton;
+        Preconditions.checkNotNull(instance, "createInstance() must be called prior to getInstance()");
+        return instance;
     }
 
     /**
      * Destroy this already created instance
      */
     public static void destroyInstance() {
-        if (singleton == null) {
-            throw new IllegalStateException("createInstance() must be called prior to destroyInstance()");
-        }
-        getInstance().stop();
+        Preconditions.checkState(instance != null, "createInstance() must be called prior to destroyInstance()");
+
+        instance.stop();
+        instance = null;
     }
 
     @Override
@@ -99,9 +95,11 @@ public class WebSocketServer implements Runnable {
         Notificator.removeAllListeners();
         if (bossGroup != null) {
             bossGroup.shutdownGracefully();
+            bossGroup = null;
         }
         if (workerGroup != null) {
             workerGroup.shutdownGracefully();
+            workerGroup = null;
         }
     }