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 // Copyright (c) 2006-2008 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 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__