mirror of https://github.com/apache/activemq.git
78 lines
2.8 KiB
C
78 lines
2.8 KiB
C
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/*
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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*/
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#ifndef ACTIVEMQ_NONBLOCKINGMSGCONSUMER_H
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#define ACTIVEMQ_NONBLOCKINGMSGCONSUMER_H
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#include <deque>
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#include <memory>
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#include "MessageConsumer.h"
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namespace ActiveMQ {
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class CoreLib;
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/// Message vendor with nonblocking semantics. (private)
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/**
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This class holds messages that have been received by a
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BrokerSession object but not delivered to the application. It
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contains an internal queue and an event file descriptor.
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When a Message is enqueued, it is stored internally and the
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event file descriptor is made read active. The receive() call
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will return NULL if no message is ready. If a message is
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ready, it will return the message (the fd will remain read
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active as long as there are messages ready).
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<b>The user of the API never actually owns one of these.</b>
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The library vends instances of NonBlockingMessageConsumerRef.
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The NonBlockingMessageConsumer object is destroyed when all of
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its references have been destroyed.
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See NonBlockingMessageConsumerRef for usage details.
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<b>Unlike the BlockingMessageConsumer, this class does not do
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thread synchronization for you.</b> This is to allow use of a
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MessageConsumer without requiring that pthreads be compiled in.
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@version $Id$
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*/
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class NonBlockingMessageConsumer : public MessageConsumer {
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private:
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int eventpipe_[2];
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std::deque<Message *> messages_;
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NonBlockingMessageConsumer(const NonBlockingMessageConsumer& oth);
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const NonBlockingMessageConsumer& operator=(const NonBlockingMessageConsumer& oth);
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friend class CoreLibImpl;
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NonBlockingMessageConsumer();
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virtual ~NonBlockingMessageConsumer();
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void enqueue(Message *msg);
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void removeQueued(const Destination &d);
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friend class NonBlockingMessageConsumerRef;
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int getEventFD() const { return eventpipe_[0]; }
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unsigned int getNumReadyMessages() const;
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std::auto_ptr<Message> receive();
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};
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};
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#endif // ACTIVEMQ_NONBLOCKINGMSGCONSUMER_H
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