QPID-1567: Initial support for asynchronous queue state replication

* Added QueueEvents class with per broker instance
* Modified qpid::broker::Queue to notify QueueEvents of enqueues and dequeues (based on configuration)
* Added replication subdir containing two plugins:
  - an event listener that registers with QueueEvents and creates messages representing received 
    events on a replication queue
  - a custom exchange type for processing messages of the format created by the listener plugin
* Added new option for controlling event generation to qpid::client::QueueOptions
* Added new queue option to qpid-config script for the same



git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@734674 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 31 insertions, 0 deletions

diff --git a/cpp/src/qpid/replication/constants.h b/cpp/src/qpid/replication/constants.h
new file mode 100644
index 0000000000..b0cef7570c
--- /dev/null
+++ b/cpp/src/qpid/replication/constants.h
@@ -0,0 +1,31 @@
+/*
+ *
+ * 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.
+ *
+ */
+namespace qpid {
+namespace replication {
+namespace constants {
+
+const std::string REPLICATION_EVENT_TYPE("qpid.replication_event_type");
+const std::string ENQUEUE("enqueue");
+const std::string DEQUEUE("dequeue");
+const std::string REPLICATION_TARGET_QUEUE("qpid.replication_target_queue");
+const std::string DEQUEUED_MESSAGE_POSITION("qpid.dequeued_message_position");
+
+}}}