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#ifndef _sys_ThreadSafeQueue_h
#define _sys_ThreadSafeQueue_h
/*
*
* Copyright (c) 2006 The Apache Software Foundation
*
* Licensed 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 <deque>
#include "ProducerConsumer.h"
#include "Exception.h"
namespace qpid {
namespace sys {
/**
* A thread safe queue template.
*/
template <class T, class ContainerType=std::deque<T> >
class ThreadSafeQueue
{
public:
ThreadSafeQueue() {}
/** Push a value onto the back of the queue */
void push(const T& value) {
ProducerConsumer::ProducerLock producer(pc);
if (producer.isOk()) {
producer.confirm();
container.push_back(value);
}
}
/** Pop a value from the front of the queue. Waits till value is available.
*@throw ShutdownException if queue is stopped while waiting.
*/
T pop() {
ProducerConsumer::ConsumerLock consumer(pc);
if (consumer.isOk()) {
consumer.confirm();
T value(container.front());
container.pop_front();
return value;
}
throw ShutdownException();
}
/**
* If a value becomes available within the timeout, set outValue
* and return true. Otherwise return false;
*/
bool pop(T& outValue, const Time& timeout) {
ProducerConsumer::ConsumerLock consumer(pc, timeout);
if (consumer.isOk()) {
consumer.confirm();
outValue = container.front();
container.pop_front();
return true;
}
return false;
}
/** Interrupt threads waiting in pop() */
void stop() { pc.stop(); }
/** True if queue is stopped */
bool isStopped() { return pc.isStopped(); }
/** Size of the queue */
size_t size() { ProducerConsumer::Lock l(pc); return container.size(); }
/** True if queue is empty */
bool empty() { ProducerConsumer::Lock l(pc); return container.empty(); }
private:
ProducerConsumer pc;
ContainerType container;
};
}} // namespace qpid::sys
#endif /*!_sys_ThreadSafeQueue_h*/
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