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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 _AggregateOutput_
#define _AggregateOutput_
#include "qpid/sys/Monitor.h"
#include "qpid/sys/OutputControl.h"
#include "qpid/sys/OutputTask.h"
#include "qpid/CommonImportExport.h"
#include <algorithm>
#include <deque>
namespace qpid {
namespace sys {
/**
* Holds a collection of output tasks, doOutput picks the next one to execute.
*
* Tasks are automatically removed if their doOutput() or hasOutput() returns false.
*
* Thread safe. addOutputTask may be called in one connection thread while
* doOutput is called in another.
*/
class AggregateOutput : public OutputTask, public OutputControl
{
typedef std::deque<OutputTask*> TaskList;
Monitor lock;
TaskList tasks;
bool busy;
OutputControl& control;
public:
QPID_COMMON_EXTERN AggregateOutput(OutputControl& c);
// These may be called concurrently with any function.
QPID_COMMON_EXTERN void abort();
QPID_COMMON_EXTERN void activateOutput();
QPID_COMMON_EXTERN void giveReadCredit(int32_t);
QPID_COMMON_EXTERN void addOutputTask(OutputTask* t);
// These functions must not be called concurrently with each other.
QPID_COMMON_EXTERN bool doOutput();
QPID_COMMON_EXTERN bool hasOutput();
QPID_COMMON_EXTERN void removeOutputTask(OutputTask* t);
QPID_COMMON_EXTERN void removeAll();
/** Apply f to each OutputTask* in the tasks list */
template <class F> void eachOutput(F f) {
Mutex::ScopedLock l(lock);
std::for_each(tasks.begin(), tasks.end(), f);
}
};
}} // namespace qpid::sys
#endif
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