From e6557a19fd89a8cb434886127917dc3b6947cf41 Mon Sep 17 00:00:00 2001
From: "Carl C. Trieloff" <cctrieloff@apache.org>
Date: Fri, 11 Mar 2011 00:37:04 +0000
Subject: QPID-3138 Topic exchange perf improvement

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@1080411 13f79535-47bb-0310-9956-ffa450edef68
---
 cpp/src/qpid/broker/TopicExchange.cpp | 19 ++++++++++++++++---
 cpp/src/qpid/broker/TopicExchange.h   | 14 +++++++++++++-
 2 files changed, 29 insertions(+), 4 deletions(-)

(limited to 'cpp/src')

diff --git a/cpp/src/qpid/broker/TopicExchange.cpp b/cpp/src/qpid/broker/TopicExchange.cpp
index 1b0fe71bcf..f3baf00d1f 100644
--- a/cpp/src/qpid/broker/TopicExchange.cpp
+++ b/cpp/src/qpid/broker/TopicExchange.cpp
@@ -221,6 +221,7 @@ TopicExchange::TopicExchange(const std::string& _name, bool _durable,
 
 bool TopicExchange::bind(Queue::shared_ptr queue, const string& routingKey, const FieldTable* args)
 {
+	ClearCache cc(&cacheLock,&bindingCache); // clear the cache on function exit.
     string fedOp(args ? args->getAsString(qpidFedOp) : fedOpBind);
     string fedTags(args ? args->getAsString(qpidFedTags) : "");
     string fedOrigin(args ? args->getAsString(qpidFedOrigin) : "");
@@ -288,6 +289,7 @@ bool TopicExchange::bind(Queue::shared_ptr queue, const string& routingKey, cons
 }
 
 bool TopicExchange::unbind(Queue::shared_ptr queue, const string& constRoutingKey, const FieldTable* /*args*/){
+	ClearCache cc(&cacheLock,&bindingCache); // clear the cache on function exit.
     RWlock::ScopedWlock l(lock);
     string routingKey = normalize(constRoutingKey);
     BindingKey* bk = bindingTree.getBindingKey(routingKey);
@@ -333,13 +335,24 @@ bool TopicExchange::isBound(Queue::shared_ptr queue, const string& pattern)
 void TopicExchange::route(Deliverable& msg, const string& routingKey, const FieldTable* /*args*/)
 {
     // Note: PERFORMANCE CRITICAL!!!
-    BindingList b(new std::vector<boost::shared_ptr<qpid::broker::Exchange::Binding> >);
+    BindingList b;
+	std::map<std::string, BindingList>::iterator it;
+	{  // only lock the cache for read
+       RWlock::ScopedRlock cl(cacheLock);
+	   it = bindingCache.find(routingKey);
+	}
     PreRoute pr(msg, this);
-    BindingsFinderIter bindingsFinder(b);
+    if (it == bindingCache.end())  // no cache hit
     {
         RWlock::ScopedRlock l(lock);
+    	b = BindingList(new std::vector<boost::shared_ptr<qpid::broker::Exchange::Binding> >);
+        BindingsFinderIter bindingsFinder(b);
         bindingTree.iterateMatch(routingKey, bindingsFinder);
-    }
+	    RWlock::ScopedWlock cwl(cacheLock);
+		bindingCache[routingKey] = b; // update cache
+    }else {
+        b = it->second;
+     }
     doRoute(msg, b);
 }
 
diff --git a/cpp/src/qpid/broker/TopicExchange.h b/cpp/src/qpid/broker/TopicExchange.h
index a6c457dcb3..3d2b3a95a9 100644
--- a/cpp/src/qpid/broker/TopicExchange.h
+++ b/cpp/src/qpid/broker/TopicExchange.h
@@ -135,7 +135,19 @@ class TopicExchange : public virtual Exchange {
     BindingNode bindingTree;
     unsigned long nBindings;
     qpid::sys::RWlock lock;     // protects bindingTree and nBindings
-
+    qpid::sys::RWlock cacheLock;     // protects cache
+	std::map<std::string, BindingList> bindingCache; // cache of matched routes.
+	class ClearCache {
+	private:
+		qpid::sys::RWlock* cacheLock;
+		std::map<std::string, BindingList>* bindingCache; 
+	public:
+		ClearCache(qpid::sys::RWlock* l, std::map<std::string, BindingList>* bc): cacheLock(l),bindingCache(bc) {};
+		~ClearCache(){ 
+			qpid::sys::RWlock::ScopedWlock l(*cacheLock);
+			bindingCache->clear();   
+		};
+	};
     bool isBound(Queue::shared_ptr queue, const std::string& pattern);
 
     class ReOriginIter;
-- 
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