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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 "qpid/sys/AggregateOutput.h"
#include "qpid/log/Statement.h"
#include <algorithm>
namespace qpid {
namespace sys {
AggregateOutput::AggregateOutput(OutputControl& c) : busy(false), control(c) {}
void AggregateOutput::abort() { control.abort(); }
void AggregateOutput::activateOutput() { control.activateOutput(); }
void AggregateOutput::giveReadCredit(int32_t credit) { control.giveReadCredit(credit); }
namespace {
// Clear the busy flag and notify waiting threads in destructor.
struct ScopedBusy {
bool& flag;
Monitor& monitor;
ScopedBusy(bool& f, Monitor& m) : flag(f), monitor(m) { f = true; }
~ScopedBusy() { flag = false; monitor.notifyAll(); }
};
}
bool AggregateOutput::doOutput() {
Mutex::ScopedLock l(lock);
ScopedBusy sb(busy, lock);
while (!tasks.empty()) {
OutputTask* t=tasks.front();
tasks.pop_front();
bool didOutput;
{
// Allow concurrent call to addOutputTask.
// removeOutputTask will wait till !busy before removing a task.
Mutex::ScopedUnlock u(lock);
didOutput = t->doOutput();
}
if (didOutput) {
tasks.push_back(t);
return true;
}
}
return false;
}
void AggregateOutput::addOutputTask(OutputTask* task) {
Mutex::ScopedLock l(lock);
tasks.push_back(task);
}
void AggregateOutput::removeOutputTask(OutputTask* task) {
Mutex::ScopedLock l(lock);
while (busy) lock.wait();
tasks.erase(std::remove(tasks.begin(), tasks.end(), task), tasks.end());
}
void AggregateOutput::removeAll()
{
Mutex::ScopedLock l(lock);
while (busy) lock.wait();
tasks.clear();
}
}} // namespace qpid::sys
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