Fix for https://issues.apache.org/activemq/browse/AMQ-1928

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@692009 13f79535-47bb-0310-9956-ffa450edef68

activemq-core/src/main/java/org/apache/activemq/transport/tcp/TcpTransportServer.java

@@ -33,6 +33,7 @@ import java.util.concurrent.TimeUnit;
 
 import javax.net.ServerSocketFactory;
 
+import org.apache.activemq.Service;
 import org.apache.activemq.ThreadPriorities;
 import org.apache.activemq.command.BrokerInfo;
 import org.apache.activemq.openwire.OpenWireFormatFactory;
@@ -41,7 +42,9 @@ import org.apache.activemq.transport.TransportLoggerFactory;
 import org.apache.activemq.transport.TransportServer;
 import org.apache.activemq.transport.TransportServerThreadSupport;
 import org.apache.activemq.util.IOExceptionSupport;
+import org.apache.activemq.util.ServiceListener;
 import org.apache.activemq.util.ServiceStopper;
+import org.apache.activemq.util.ServiceSupport;
 import org.apache.activemq.wireformat.WireFormat;
 import org.apache.activemq.wireformat.WireFormatFactory;
 import org.apache.commons.logging.Log;
@@ -54,7 +57,7 @@ import org.apache.commons.logging.LogFactory;
  * @version $Revision: 1.1 $
  */
 
-public class TcpTransportServer extends TransportServerThreadSupport {
+public class TcpTransportServer extends TransportServerThreadSupport implements ServiceListener{
 
     private static final Log LOG = LogFactory.getLog(TcpTransportServer.class);
     protected ServerSocket serverSocket;
@@ -64,7 +67,7 @@ public class TcpTransportServer extends TransportServerThreadSupport {
     protected long maxInactivityDuration = 30000;
     protected int minmumWireFormatVersion;
     protected boolean useQueueForAccept=true;
-   
+       
     /**
      * trace=true -> the Transport stack where this TcpTransport
      * object will be, will have a TransportLogger layer
@@ -104,6 +107,11 @@ public class TcpTransportServer extends TransportServerThreadSupport {
     protected final ServerSocketFactory serverSocketFactory;
     protected BlockingQueue<Socket> socketQueue = new LinkedBlockingQueue<Socket>();
     protected Thread socketHandlerThread;
+    /**
+     * The maximum number of sockets allowed for this server
+     */
+    protected int maximumConnections = Integer.MAX_VALUE;
+    protected int currentTransportCount=0;
   
     public TcpTransportServer(TcpTransportFactory transportFactory, URI location, ServerSocketFactory serverSocketFactory) throws IOException, URISyntaxException {
         super(location);
@@ -287,7 +295,7 @@ public class TcpTransportServer extends TransportServerThreadSupport {
      * @return
      * @throws IOException
      */
-    protected Transport createTransport(Socket socket, WireFormat format) throws IOException {
+    protected  Transport createTransport(Socket socket, WireFormat format) throws IOException {
         return new TcpTransport(format, socket);
     }
 
@@ -360,8 +368,11 @@ public class TcpTransportServer extends TransportServerThreadSupport {
         this.transportOptions = transportOptions;
     }
     
-    protected void handleSocket(Socket socket) {
+    protected final void handleSocket(Socket socket) {
         try {
+            if (this.currentTransportCount >= this.maximumConnections) {
+                
+            }else {
             HashMap<String, Object> options = new HashMap<String, Object>();
             options.put("maxInactivityDuration", Long
                     .valueOf(maxInactivityDuration));
@@ -380,9 +391,13 @@ public class TcpTransportServer extends TransportServerThreadSupport {
             options.putAll(transportOptions);
             WireFormat format = wireFormatFactory.createWireFormat();
             Transport transport = createTransport(socket, format);
+            if (transport instanceof ServiceSupport) {
+                ((ServiceSupport) transport).addServiceListener(this);
+            }
             Transport configuredTransport = transportFactory.serverConfigure(
                     transport, format, options);
             getAcceptListener().onAccept(configuredTransport);
+            }
         } catch (SocketTimeoutException ste) {
             // expect this to happen
         } catch (Exception e) {
@@ -393,6 +408,7 @@ public class TcpTransportServer extends TransportServerThreadSupport {
                 onAcceptError(e);
             }
         }
+        
     }    
 
 	public int getSoTimeout() {
@@ -418,4 +434,27 @@ public class TcpTransportServer extends TransportServerThreadSupport {
 	public void setConnectionTimeout(int connectionTimeout) {
 		this.connectionTimeout = connectionTimeout;
 	}
+
+    /**
+     * @return the maximumConnections
+     */
+    public int getMaximumConnections() {
+        return maximumConnections;
+    }
+
+    /**
+     * @param maximumConnections the maximumConnections to set
+     */
+    public void setMaximumConnections(int maximumConnections) {
+        this.maximumConnections = maximumConnections;
+    }
+
+    
+    public void started(Service service) {
+       this.currentTransportCount++;
+    }
+
+    public void stopped(Service service) {
+        this.currentTransportCount--;
+    }
 }

activemq-core/src/main/java/org/apache/activemq/util/ServiceListener.java

@@ -0,0 +1,31 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.apache.activemq.util;
+
+import org.apache.activemq.Service;
+
+/**
+ * A listener for service start, stop events
+ * 
+ * @version $Revision: 1.1 $
+ */
+public interface ServiceListener{
+    
+    public void started(Service service);
+    
+    public void stopped(Service service);
+}

activemq-core/src/main/java/org/apache/activemq/util/ServiceSupport.java

@@ -16,6 +16,8 @@
  */
 package org.apache.activemq.util;
 
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.atomic.AtomicBoolean;
 
 import org.apache.activemq.Service;
@@ -34,6 +36,7 @@ public abstract class ServiceSupport implements Service {
     private AtomicBoolean started = new AtomicBoolean(false);
     private AtomicBoolean stopping = new AtomicBoolean(false);
     private AtomicBoolean stopped = new AtomicBoolean(false);
+    private List<ServiceListener>serviceListeners = new CopyOnWriteArrayList<ServiceListener>();
 
     public static void dispose(Service service) {
         try {
@@ -52,6 +55,9 @@ public abstract class ServiceSupport implements Service {
             } finally {
                 started.set(success);
             }
+            for(ServiceListener l:this.serviceListeners) {
+                l.started(this);
+            }
         }
     }
 
@@ -67,6 +73,9 @@ public abstract class ServiceSupport implements Service {
             stopped.set(true);
             started.set(false);
             stopping.set(false);
+            for(ServiceListener l:this.serviceListeners) {
+                l.stopped(this);
+            }
             stopper.throwFirstException();
         }
     }
@@ -91,6 +100,14 @@ public abstract class ServiceSupport implements Service {
     public boolean isStopped() {
         return stopped.get();
     }
+    
+    public void addServiceListener(ServiceListener l) {
+        this.serviceListeners.add(l);
+    }
+    
+    public void removeServiceListener(ServiceListener l) {
+        this.serviceListeners.remove(l);
+    }
 
     protected abstract void doStop(ServiceStopper stopper) throws Exception;