1 files changed, 52 insertions, 0 deletions
diff --git a/java/java/client/src/org/apache/qpid/client/Closeable.java b/java/java/client/src/org/apache/qpid/client/Closeable.java
new file mode 100644
index 0000000000..873cb55726
--- /dev/null
+++ b/java/java/client/src/org/apache/qpid/client/Closeable.java
@@ -0,0 +1,52 @@
+/*
+ *
+ * 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.client;
+
+import javax.jms.IllegalStateException;
+import javax.jms.JMSException;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/**
+ * Provides support for orderly shutdown of an object.
+ */
+public abstract class Closeable
+{
+    /**
+     * We use an atomic boolean so that we do not have to synchronized access to this flag. Synchronizing
+     * access to this flag would mean have a synchronized block in every method.
+     */
+    protected final AtomicBoolean _closed = new AtomicBoolean(false);
+
+    protected void checkNotClosed() throws JMSException
+    {
+        if (_closed.get())
+        {
+            throw new IllegalStateException("Object " + toString() + " has been closed");
+        }
+    }
+
+    public boolean isClosed()
+    {
+        return _closed.get();
+    }
+
+    public abstract void close() throws JMSException;
+}