* Summary:

	 - Improved plugin framework and HandlerUpdater interface.
	 - Cluster handlers for traffic to/from cluster.
	 - Cluster HandlerUpdater configures channel chains for cluster.
	 - Cluster PluginProvider registers cluster objects with broker.

	* src/qpid/framing/AMQFrame.h: Made data members public. Handlers
	need to be able to modify frame data, getters/setters are just a
	nuisance here.

	* src/tests/Cluster.cpp: Updated for cluster changes, using
	handlers instead of friendship to hook test into Cluster code.

	* src/qpid/framing/amqp_types.h: Added CHANNEL_MAX and
	CHANNEL_HIGH_BIT constants.

	* src/qpid/framing/HandlerUpdater.h: Renamed ChannelInitializer,
	broke dependency on broker channel types.

	* src/qpid/framing/Handler.h: Added constructors and nextHandler()

	* src/qpid/framing/AMQFrame.h (class AMQFrame): Inlined getChannel()

	* src/qpid/cluster/ClusterPluginProvider.cpp: Provider for cluster
	plugins.

	* src/qpid/cluster/Cluster.cpp: Use ChannelManager. Factor out
	plugin details to ClusterPluginProvider.

	* src/qpid/cluster/ChannelManager.h: Insert cluster handlers
	into channel chains, route frames between cluster and channels.
	
	* src/qpid/broker/BrokerAdapter.cpp (startOk): use CHANNEL_MAX
	constant.

	* src/qpid/broker/Broker.cpp:
	 - Refactored for new plugin framework.
	 - Added getUrl().

	* src/qpid/Url.h: Added constructor from Address.

	* src/qpid/Plugin.h: Generalized plugin framework, broke
	dependency on Broker interfaces. We may want to use plug-ins for
	clients also at some point.

	* src/tests/run_test: Fix bug when VALGRIND is not set.


git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@551981 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 11 insertions, 1 deletions

diff --git a/cpp/src/qpid/framing/Handler.h b/cpp/src/qpid/framing/Handler.h
index 56e150a66d..f6b59393d9 100644
--- a/cpp/src/qpid/framing/Handler.h
+++ b/cpp/src/qpid/framing/Handler.h
@@ -40,11 +40,21 @@ template <class T> struct Handler {
         Chain out;
     };
 
+    Handler() {}
+    Handler(Chain next_) : next(next_) {}
     virtual ~Handler() {}
+
     virtual void handle(T) = 0;
+
+    /** Next handler. Public so chains can be modified by altering next. */
     Chain next;
-};
 
+  protected:
+    /** Derived handle() implementations call nextHandler to invoke the
+     * next handler in the chain. */
+    void nextHandler(T data) { if (next) next->handle(data); }
+
+};
 
 }}