1 files changed, 114 insertions, 0 deletions
diff --git a/trunk/qpid/java/broker/src/main/java/org/apache/qpid/server/exchange/Index.java b/trunk/qpid/java/broker/src/main/java/org/apache/qpid/server/exchange/Index.java
new file mode 100644
index 0000000000..90d04c814a
--- /dev/null
+++ b/trunk/qpid/java/broker/src/main/java/org/apache/qpid/server/exchange/Index.java
@@ -0,0 +1,114 @@
+/*
+ *
+ * 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.exchange;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.ArrayList;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+import org.apache.qpid.framing.AMQShortString;
+import org.apache.qpid.server.queue.AMQQueue;
+
+/**
+ * An index of queues against routing key. Allows multiple queues to be stored
+ * against the same key. Used in the DirectExchange.
+ */
+class Index
+{
+    private ConcurrentMap<AMQShortString, ArrayList<AMQQueue>> _index
+            = new ConcurrentHashMap<AMQShortString, ArrayList<AMQQueue>>();
+    private ConcurrentMap<String, ArrayList<AMQQueue>> _stringIndex
+            = new ConcurrentHashMap<String, ArrayList<AMQQueue>>();
+
+
+    synchronized boolean add(AMQShortString key, AMQQueue queue)
+    {
+        ArrayList<AMQQueue> queues = _index.get(key);
+        if(queues == null)
+        {
+            queues = new ArrayList<AMQQueue>();
+        }
+        else
+        {
+            queues = new ArrayList<AMQQueue>(queues);
+        }
+
+        //next call is atomic, so there is no race to create the list
+        _index.put(key, queues);
+        _stringIndex.put(key.toString(), queues);
+
+        if(queues.contains(queue))
+        {
+            return false;
+        }
+        else
+        {
+            return queues.add(queue);
+        }
+    }
+
+
+
+    synchronized boolean remove(AMQShortString key, AMQQueue queue)
+    {
+        ArrayList<AMQQueue> queues = _index.get(key);
+        if (queues != null)
+        {
+            queues = new ArrayList<AMQQueue>(queues);
+            boolean removed = queues.remove(queue);
+            if(removed)
+            {
+                if (queues.size() == 0)
+                {
+                    _index.remove(key);
+                    _stringIndex.remove(key.toString());
+                }
+                else
+                {
+                    _index.put(key, queues);
+                    _stringIndex.put(key.toString(), queues);
+                }
+            }
+            return removed;
+        }
+        return false;
+    }
+
+    ArrayList<AMQQueue> get(AMQShortString key)
+    {
+        return _index.get(key);
+    }
+
+    ArrayList<AMQQueue> get(String key)
+    {
+        return _stringIndex.get(key);
+    }
+
+
+    Map<AMQShortString, List<AMQQueue>> getBindingsMap()
+    {
+        return new HashMap<AMQShortString, List<AMQQueue>>(_index);
+    }
+}