Fixed issue with producer flow control in a cluster.

Producer flow control uses a Timer and other clock-based calculations to send flow control commands.
These commands are not predictably ordered from the clusters point of view.

Added getClusterOrderProxy() to SessionState. In a cluster it returns
a proxy that defers sending a command to the client until it is
multicast to the cluster.  In a stand alone broker it is just the
normal proxy. Updated producer flow control to use this proxy.

Cluster flow control is turned off in shadow connections. Only the
directly connected node does flow control calculations and multicasts
the commands to send. All nodes sending of the commands thru SessionState
to ensure consistent session state (e.g. command numbering.)


git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@747528 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 46 insertions, 0 deletions

diff --git a/cpp/src/qpid/cluster/McastFrameHandler.h b/cpp/src/qpid/cluster/McastFrameHandler.h
new file mode 100644
index 0000000000..5127c31c84
--- /dev/null
+++ b/cpp/src/qpid/cluster/McastFrameHandler.h
@@ -0,0 +1,46 @@
+#ifndef QPID_CLUSTER_MCASTFRAMEHANDLER_H
+#define QPID_CLUSTER_MCASTFRAMEHANDLER_H
+
+/*
+ *
+ * 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.
+ *
+ */
+
+#include "types.h"
+#include "Multicaster.h"
+#include "qpid/framing/FrameHandler.h"
+
+namespace qpid {
+namespace cluster {
+
+/**
+ * A frame handler that multicasts frames as CONTROL events.
+ */
+class McastFrameHandler : public framing::FrameHandler
+{
+  public:
+    McastFrameHandler(Multicaster& m, const ConnectionId& cid) : mcast(m), connection(cid) {}
+    void handle(framing::AMQFrame& frame) { mcast.mcastControl(frame, connection); }
+  private:
+    Multicaster& mcast;
+    ConnectionId connection;
+};
+}} // namespace qpid::cluster
+
+#endif  /*!QPID_CLUSTER_MCASTFRAMEHANDLER_H*/