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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_TASK_QUEUE_H_
#define BASE_TASK_QUEUE_H_
#pragma once
#include <deque>
#include "base/base_api.h"
#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 BASE_API TaskQueue : public Task {
public:
TaskQueue();
~TaskQueue();
// 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 IsEmpty() const;
// 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();
private:
// The list of tasks we are waiting to run.
std::deque<Task*> queue_;
};
#endif // BASE_TASK_QUEUE_H_