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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.
*
*/
#include <string>
#ifndef _Exchange_
#define _Exchange_
namespace qpid {
namespace client {
/**
* A 'handle' used to represent an AMQP exchange in the Channel
* methods. Exchanges are the destinations to which messages are
* published.
*
* There are different types of exchange (the standard types are
* available as static constants, see DIRECT_EXCHANGE,
* TOPIC_EXCHANGE and HEADERS_EXCHANGE). A Queue can be bound to
* an exchange using Channel::bind() and messages published to
* that exchange are then routed to the queue based on the details
* of the binding and the type of exchange.
*
* There are some standard exchange instances that are predeclared
* on all AMQP brokers. These are defined as statisc members
* STANDARD_DIRECT_EXCHANGE, STANDARD_TOPIC_EXCHANGE and
* STANDARD_HEADERS_EXCHANGE. There is also the 'default' exchange
* (member DEFAULT_EXCHANGE) which is nameless and of type
* 'direct' and has every declared queue bound to it by queue
* name.
*
* \ingroup clientapi
*/
class Exchange{
const std::string name;
const std::string type;
public:
/**
* A direct exchange routes messages published with routing
* key X to any queue bound with key X (i.e. an exact match is
* used).
*/
static const std::string DIRECT_EXCHANGE;
/**
* A topic exchange treat the key with which a queue is bound
* as a pattern and routes all messages whose routing keys
* match that pattern to the bound queue. The routing key for
* a message must consist of zero or more alpha-numeric words
* delimited by dots. The pattern is of a similar form but *
* can be used to match excatly one word and # can be used to
* match zero or more words.
*/
static const std::string TOPIC_EXCHANGE;
/**
* The headers exchange routes messages based on whether their
* headers match the binding arguments specified when
* binding. (see the AMQP spec for more details).
*/
static const std::string HEADERS_EXCHANGE;
/**
* The 'default' exchange, nameless and of type 'direct'. Has
* every declared queue bound to it by name.
*/
static const Exchange DEFAULT_EXCHANGE;
/**
* The standard direct exchange, named amq.direct.
*/
static const Exchange STANDARD_DIRECT_EXCHANGE;
/**
* The standard topic exchange, named amq.topic.
*/
static const Exchange STANDARD_TOPIC_EXCHANGE;
/**
* The standard headers exchange, named amq.header.
*/
static const Exchange STANDARD_HEADERS_EXCHANGE;
Exchange(std::string name, std::string type = DIRECT_EXCHANGE);
const std::string& getName() const;
const std::string& getType() const;
};
}
}
#endif
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