| /* |
| * 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 "CompositeTaskRunner.h" |
| |
| #include <memory> |
| |
| #include <activemq/exceptions/ActiveMQException.h> |
| |
| using namespace std; |
| using namespace activemq; |
| using namespace activemq::threads; |
| using namespace activemq::exceptions; |
| using namespace decaf; |
| using namespace decaf::util; |
| using namespace decaf::lang; |
| using namespace decaf::lang::exceptions; |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| namespace activemq { |
| namespace threads { |
| |
| class CompositeTaskRunnerImpl { |
| private: |
| |
| CompositeTaskRunnerImpl(const CompositeTaskRunnerImpl&); |
| CompositeTaskRunnerImpl& operator= (const CompositeTaskRunnerImpl&); |
| |
| public: |
| |
| decaf::util::LinkedList<CompositeTask*> tasks; |
| mutable decaf::util::concurrent::Mutex mutex; |
| |
| decaf::lang::Pointer<decaf::lang::Thread> thread; |
| |
| bool threadTerminated; |
| bool pending; |
| bool shutdown; |
| |
| public: |
| |
| CompositeTaskRunnerImpl() : tasks(), |
| mutex(), |
| thread(), |
| threadTerminated(false), |
| pending(false), |
| shutdown(false) { |
| } |
| |
| }; |
| |
| }} |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| CompositeTaskRunner::CompositeTaskRunner() : impl(new CompositeTaskRunnerImpl) { |
| this->impl->thread.reset(new Thread(this, "ActiveMQ CompositeTaskRunner Thread")); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| CompositeTaskRunner::~CompositeTaskRunner() { |
| try { |
| shutdown(); |
| impl->thread->join(); |
| impl->thread.reset(NULL); |
| } |
| AMQ_CATCHALL_NOTHROW() |
| |
| try { |
| delete this->impl; |
| } |
| AMQ_CATCHALL_NOTHROW() |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void CompositeTaskRunner::start() { |
| |
| synchronized(&impl->mutex) { |
| if (!impl->shutdown && !this->impl->thread->isAlive()) { |
| this->impl->thread->start(); |
| this->wakeup(); |
| } |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| bool CompositeTaskRunner::isStarted() const { |
| |
| bool result = false; |
| |
| synchronized(&impl->mutex) { |
| if (this->impl->thread != NULL && this->impl->thread->isAlive()) { |
| result = true; |
| } |
| } |
| |
| return result; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void CompositeTaskRunner::shutdown(long long timeout) { |
| |
| synchronized(&impl->mutex) { |
| impl->shutdown = true; |
| impl->pending = true; |
| impl->mutex.notifyAll(); |
| } |
| |
| // Wait till the thread stops ( no need to wait if shutdown |
| // is called from thread that is shutting down) |
| if (Thread::currentThread() != this->impl->thread.get() && !impl->threadTerminated) { |
| this->impl->thread->join(timeout); |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void CompositeTaskRunner::shutdown() { |
| |
| synchronized(&impl->mutex) { |
| impl->shutdown = true; |
| impl->pending = true; |
| impl->mutex.notifyAll(); |
| } |
| |
| // Wait till the thread stops ( no need to wait if shutdown |
| // is called from thread that is shutting down) |
| if (Thread::currentThread() != this->impl->thread.get() && !impl->threadTerminated) { |
| impl->thread->join(); |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void CompositeTaskRunner::wakeup() { |
| |
| synchronized(&impl->mutex) { |
| if (impl->shutdown) { |
| return; |
| } |
| impl->pending = true; |
| impl->mutex.notifyAll(); |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void CompositeTaskRunner::run() { |
| |
| try { |
| |
| while (true) { |
| synchronized(&impl->mutex) { |
| impl->pending = false; |
| if (impl->shutdown) { |
| return; |
| } |
| } |
| |
| if (!this->iterate()) { |
| // wait to be notified. |
| synchronized(&impl->mutex) { |
| if (impl->shutdown) { |
| return; |
| } |
| while (!impl->pending && !impl->shutdown) { |
| impl->mutex.wait(); |
| } |
| } |
| } |
| } |
| } |
| AMQ_CATCHALL_NOTHROW() |
| |
| // Make sure we notify any waiting threads that thread |
| // has terminated. |
| synchronized(&impl->mutex) { |
| impl->threadTerminated = true; |
| impl->mutex.notifyAll(); |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void CompositeTaskRunner::addTask(CompositeTask* task) { |
| |
| if (task != NULL) { |
| synchronized(&impl->tasks) { |
| impl->tasks.add(task); |
| wakeup(); |
| } |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void CompositeTaskRunner::removeTask(CompositeTask* task) { |
| |
| if (task != NULL) { |
| synchronized(&impl->tasks) { |
| impl->tasks.remove(task); |
| wakeup(); |
| } |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| bool CompositeTaskRunner::iterate() { |
| |
| synchronized(&impl->tasks) { |
| |
| for (int i = 0; i < impl->tasks.size(); ++i) { |
| CompositeTask* task = impl->tasks.pop(); |
| |
| if (task->isPending()) { |
| task->iterate(); |
| impl->tasks.addLast(task); |
| |
| // Always return true, so that we check again for any of |
| // the other tasks that might now be pending. |
| return true; |
| } else { |
| impl->tasks.addLast(task); |
| } |
| } |
| } |
| |
| return false; |
| } |