1 files changed, 34 insertions, 0 deletions
diff --git a/qpid/java/common/src/main/java/org/apache/qpid/util/concurrent/AlreadyUnblockedException.java b/qpid/java/common/src/main/java/org/apache/qpid/util/concurrent/AlreadyUnblockedException.java
new file mode 100644
index 0000000000..e0c0337898
--- /dev/null
+++ b/qpid/java/common/src/main/java/org/apache/qpid/util/concurrent/AlreadyUnblockedException.java
@@ -0,0 +1,34 @@
+package org.apache.qpid.util.concurrent;
+/*
+ * 
+ * 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.
+ * 
+ */
+
+
+/**
+ * Used to signal that a data element and its producer cannot be requeued or sent an error message when using a
+ * {@link BatchSynchQueue} because the producer has already been unblocked by an unblocking take on the queue.
+ *
+ * <p/><table id="crc"><caption>CRC Card</caption>
+ * <tr><th> Responsibilities <th> Collaborations
+ * <tr><td> Signal that an unblocking take has already occurred.
+ * </table>
+ */
+public class AlreadyUnblockedException extends RuntimeException
+{ }