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/*
*
* 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.
*
*/
#ifndef _TopicExchange_
#define _TopicExchange_
#include <map>
#include <vector>
#include "qpid/broker/BrokerImportExport.h"
#include "qpid/broker/Exchange.h"
#include "qpid/framing/FieldTable.h"
#include "qpid/sys/Monitor.h"
#include "qpid/broker/Queue.h"
namespace qpid {
namespace broker {
class QPID_BROKER_CLASS_EXTERN TopicExchange : public virtual Exchange {
struct TokenIterator;
class Normalizer;
struct BindingKey { // binding for this node
Binding::vector bindingVector;
FedBinding fedBinding;
};
// Binding database:
// The dotted form of a binding key is broken up and stored in a directed tree graph.
// Common binding prefix are merged. This allows the route match alogrithm to quickly
// isolate those sub-trees that match a given routingKey.
// For example, given the routes:
// a.b.c.<...>
// a.b.d.<...>
// a.x.y.<...>
// The resulting tree would be:
// a-->b-->c-->...
// | +-->d-->...
// +-->x-->y-->...
//
class QPID_BROKER_CLASS_EXTERN BindingNode {
public:
typedef boost::shared_ptr<BindingNode> shared_ptr;
// for database transversal (visit a node).
class TreeIterator {
public:
TreeIterator() {};
virtual ~TreeIterator() {};
virtual bool visit(BindingNode& node) = 0;
};
BindingNode() {};
BindingNode(const std::string& token) : token(token) {};
QPID_BROKER_EXTERN virtual ~BindingNode();
// add normalizedRoute to tree, return associated BindingKey
QPID_BROKER_EXTERN BindingKey* addBindingKey(const std::string& normalizedRoute);
// return BindingKey associated with normalizedRoute
QPID_BROKER_EXTERN BindingKey* getBindingKey(const std::string& normalizedRoute);
// remove BindingKey associated with normalizedRoute
QPID_BROKER_EXTERN void removeBindingKey(const std::string& normalizedRoute);
// applies iter against each node in tree until iter returns false
QPID_BROKER_EXTERN bool iterateAll(TreeIterator& iter);
// applies iter against only matching nodes until iter returns false
QPID_BROKER_EXTERN bool iterateMatch(const std::string& routingKey, TreeIterator& iter);
std::string routePattern; // normalized binding that matches this node
BindingKey bindings; // for matches against this node
protected:
std::string token; // portion of pattern represented by this node
// children
typedef std::map<const std::string, BindingNode::shared_ptr> ChildMap;
ChildMap childTokens;
BindingNode::shared_ptr starChild; // "*" subtree
BindingNode::shared_ptr hashChild; // "#" subtree
unsigned int getChildCount() { return childTokens.size() +
(starChild ? 1 : 0) + (hashChild ? 1 : 0); }
BindingKey* addBindingKey(TokenIterator& bKey,
const std::string& fullPattern);
bool removeBindingKey(TokenIterator& bKey,
const std::string& fullPattern);
BindingKey* getBindingKey(TokenIterator& bKey);
QPID_BROKER_EXTERN virtual bool iterateMatch(TokenIterator& rKey, TreeIterator& iter);
bool iterateMatchChildren(const TokenIterator& key, TreeIterator& iter);
};
// Special case: ("*" token) Node in the tree for a match exactly one wildcard
class StarNode : public BindingNode {
public:
StarNode();
~StarNode() {};
protected:
virtual bool iterateMatch(TokenIterator& key, TreeIterator& iter);
};
// Special case: ("#" token) Node in the tree for a match zero or more
class HashNode : public BindingNode {
public:
HashNode();
~HashNode() {};
protected:
virtual bool iterateMatch(TokenIterator& key, TreeIterator& iter);
};
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;
bool cleared;
public:
ClearCache(qpid::sys::RWlock* l, std::map<std::string, BindingList>* bc): cacheLock(l),
bindingCache(bc),cleared(false) {};
void clearCache() {
qpid::sys::RWlock::ScopedWlock l(*cacheLock);
if (!cleared) {
bindingCache->clear();
cleared =true;
}
};
~ClearCache(){
clearCache();
};
};
BindingKey *getQueueBinding(Queue::shared_ptr queue, const std::string& pattern);
bool deleteBinding(Queue::shared_ptr queue,
const std::string& routingKey,
BindingKey *bk);
class ReOriginIter;
class BindingsFinderIter;
class QueueFinderIter;
public:
static const std::string typeName;
static QPID_BROKER_EXTERN std::string normalize(const std::string& pattern);
QPID_BROKER_EXTERN TopicExchange(const std::string& name,
management::Manageable* parent = 0, Broker* broker = 0);
QPID_BROKER_EXTERN TopicExchange(const std::string& _name,
bool _durable,
const qpid::framing::FieldTable& _args,
management::Manageable* parent = 0, Broker* broker = 0);
virtual std::string getType() const { return typeName; }
QPID_BROKER_EXTERN virtual bool bind(Queue::shared_ptr queue,
const std::string& routingKey,
const qpid::framing::FieldTable* args);
virtual bool unbind(Queue::shared_ptr queue, const std::string& routingKey, const qpid::framing::FieldTable* args);
QPID_BROKER_EXTERN virtual void route(Deliverable& msg,
const std::string& routingKey,
const qpid::framing::FieldTable* args);
QPID_BROKER_EXTERN virtual bool isBound(Queue::shared_ptr queue,
const std::string* const routingKey,
const qpid::framing::FieldTable* const args);
QPID_BROKER_EXTERN virtual ~TopicExchange();
virtual bool supportsDynamicBinding() { return true; }
class TopicExchangeTester;
friend class TopicExchangeTester;
};
}
}
#endif
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