1 files changed, 90 insertions, 0 deletions
diff --git a/java/java/cluster/src/org/apache/qpid/server/cluster/InductionBuffer.java b/java/java/cluster/src/org/apache/qpid/server/cluster/InductionBuffer.java
new file mode 100644
index 0000000000..586d7d4ae8
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+++ b/java/java/cluster/src/org/apache/qpid/server/cluster/InductionBuffer.java
@@ -0,0 +1,90 @@
+/*
+ *
+ * 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;
+
+import org.apache.mina.common.IoSession;
+
+import java.util.LinkedList;
+import java.util.Queue;
+
+/**
+ * Buffers any received messages until join completes.
+ *
+ */
+class InductionBuffer
+{
+    private final Queue<Message> _buffer = new LinkedList<Message>();
+    private final MessageHandler _handler;
+    private boolean _buffering = true;
+
+    InductionBuffer(MessageHandler handler)
+    {
+        _handler = handler;
+    }
+
+    private void process() throws Exception
+    {
+        for (Message o = _buffer.poll(); o != null; o = _buffer.poll())
+        {
+            o.deliver(_handler);
+        }
+        _buffering = false;
+    }
+
+    synchronized void deliver() throws Exception
+    {
+        process();
+    }
+
+    synchronized void receive(IoSession session, Object msg) throws Exception
+    {
+        if (_buffering)
+        {
+            _buffer.offer(new Message(session, msg));
+        }
+        else
+        {
+            _handler.deliver(session, msg);
+        }
+    }
+
+    private static class Message
+    {
+        private final IoSession _session;
+        private final Object _msg;
+
+        Message(IoSession session, Object msg)
+        {
+            _session = session;
+            _msg = msg;
+        }
+
+        void deliver(MessageHandler handler) throws Exception
+        {
+            handler.deliver(_session, _msg);
+        }
+    }
+
+    static interface MessageHandler
+    {
+        public void deliver(IoSession session, Object msg) throws Exception;
+    }
+}