1 files changed, 130 insertions, 0 deletions
diff --git a/java/java/cluster/src/org/apache/qpid/server/cluster/handler/ReplicatingHandler.java b/java/java/cluster/src/org/apache/qpid/server/cluster/handler/ReplicatingHandler.java
new file mode 100644
index 0000000000..db340c6a61
--- /dev/null
+++ b/java/java/cluster/src/org/apache/qpid/server/cluster/handler/ReplicatingHandler.java
@@ -0,0 +1,130 @@
+/*
+ *
+ * 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.qpid.server.cluster.handler;
+
+import org.apache.log4j.Logger;
+import org.apache.qpid.AMQException;
+import org.apache.qpid.framing.AMQMethodBody;
+import org.apache.qpid.server.cluster.BroadcastPolicy;
+import org.apache.qpid.server.cluster.ClusteredProtocolSession;
+import org.apache.qpid.server.cluster.GroupManager;
+import org.apache.qpid.server.cluster.GroupResponseHandler;
+import org.apache.qpid.server.cluster.util.LogMessage;
+import org.apache.qpid.server.cluster.Member;
+import org.apache.qpid.server.cluster.SimpleSendable;
+import org.apache.qpid.server.cluster.policy.StandardPolicies;
+import org.apache.qpid.server.exchange.ExchangeRegistry;
+import org.apache.qpid.server.protocol.AMQMethodEvent;
+import org.apache.qpid.server.protocol.AMQProtocolSession;
+import org.apache.qpid.server.queue.QueueRegistry;
+import org.apache.qpid.server.state.AMQStateManager;
+import org.apache.qpid.server.state.StateAwareMethodListener;
+
+import java.util.List;
+
+/**
+ * Basic template for handling methods that should be broadcast to the group and
+ * processed locally after 'completion' of this broadcast.
+ *
+ */
+class ReplicatingHandler<A extends AMQMethodBody> extends ClusterMethodHandler<A> implements StandardPolicies
+{
+    protected static final Logger _logger = Logger.getLogger(ReplicatingHandler.class);
+
+    private final StateAwareMethodListener<A> _base;
+    private final GroupManager _groupMgr;
+    private final BroadcastPolicy _policy;
+
+    ReplicatingHandler(GroupManager groupMgr, StateAwareMethodListener<A> base)
+    {
+        this(groupMgr, base, null);
+    }
+
+    ReplicatingHandler(GroupManager groupMgr, StateAwareMethodListener<A> base, BroadcastPolicy policy)
+    {
+        _groupMgr = groupMgr;
+        _base = base;
+        _policy = policy;
+    }
+
+    protected void peer(AMQStateManager stateMgr, QueueRegistry queues, ExchangeRegistry exchanges, AMQProtocolSession session, AMQMethodEvent<A> evt) throws AMQException
+    {
+        local(stateMgr, queues, exchanges, session, evt);
+        _logger.debug(new LogMessage("Handled {0} locally", evt.getMethod()));
+    }
+
+    protected void client(AMQStateManager stateMgr, QueueRegistry queues, ExchangeRegistry exchanges, AMQProtocolSession session, AMQMethodEvent<A> evt) throws AMQException
+    {
+        replicate(stateMgr, queues, exchanges, session, evt);
+    }
+
+    protected void replicate(AMQStateManager stateMgr, QueueRegistry queues, ExchangeRegistry exchanges, AMQProtocolSession session, AMQMethodEvent<A> evt) throws AMQException
+    {
+        if (_policy == null)
+        {
+            //asynch delivery
+            _groupMgr.broadcast(new SimpleSendable(evt.getMethod()));
+            local(stateMgr, queues, exchanges, session, evt);
+        }
+        else
+        {
+            Callback callback = new Callback(stateMgr, queues, exchanges, session, evt);
+            _groupMgr.broadcast(new SimpleSendable(evt.getMethod()), _policy, callback);
+        }
+        _logger.debug(new LogMessage("Replicated {0} to peers", evt.getMethod()));
+    }
+
+    protected void local(AMQStateManager stateMgr, QueueRegistry queues, ExchangeRegistry exchanges, AMQProtocolSession session, AMQMethodEvent<A> evt) throws AMQException
+    {
+        _base.methodReceived(stateMgr, queues, exchanges, session, evt);
+    }
+
+    private class Callback implements GroupResponseHandler
+    {
+        private final AMQStateManager _stateMgr;
+        private final QueueRegistry _queues;
+        private final ExchangeRegistry _exchanges;
+        private final AMQProtocolSession _session;
+        private final AMQMethodEvent<A> _evt;
+
+        Callback(AMQStateManager stateMgr, QueueRegistry queues, ExchangeRegistry exchanges, AMQProtocolSession session, AMQMethodEvent<A> evt)
+        {
+            _stateMgr = stateMgr;
+            _queues = queues;
+            _exchanges = exchanges;
+            _session = session;
+            _evt = evt;
+        }
+
+        public void response(List<AMQMethodBody> responses, List<Member> members)
+        {
+            try
+            {
+                local(_stateMgr, _queues, _exchanges, _session, _evt);
+                _logger.debug(new LogMessage("Handled {0} locally, in response to completion of replication", _evt.getMethod()));
+            }
+            catch (AMQException e)
+            {
+                _logger.error(new LogMessage("Error handling {0}:{1}", _evt.getMethod(), e), e);
+            }
+        }
+    }
+}