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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef CHROME_COMMON_TASK_QUEUE_H__
#define CHROME_COMMON_TASK_QUEUE_H__
#include <deque>
#include "base/task.h"
// A TaskQueue is a queue of tasks waiting to be run. To run the tasks, call
// the Run method. A task queue is itself a Task so that it can be placed in a
// message loop or another task queue.
class TaskQueue : public Task {
public:
TaskQueue();
~TaskQueue();
// Run all the tasks in the queue. New tasks pushed onto the queue during
// a run will be run next time |Run| is called.
virtual void Run();
// Push the specified task onto the queue. When the queue is run, the tasks
// will be run in the order they are pushed.
//
// This method takes ownership of |task| and will delete task after it is run
// (or when the TaskQueue is destroyed, if we never got a chance to run it).
void Push(Task* task);
// Remove all tasks from the queue. The tasks are deleted.
void Clear();
// Returns true if this queue contains no tasks.
bool Empty() const;
private:
// The list of tasks we are waiting to run.
std::deque<Task*> queue_;
};
#endif // CHROME_COMMON_TASK_QUEUE_H__
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