mirror of
https://github.com/DrKLO/Telegram.git
synced 2024-12-23 15:00:50 +01:00
97 lines
3.2 KiB
C++
97 lines
3.2 KiB
C++
// Copyright (c) 2013 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_DEFERRED_SEQUENCED_TASK_RUNNER_H_
|
|
#define BASE_DEFERRED_SEQUENCED_TASK_RUNNER_H_
|
|
|
|
#include <vector>
|
|
|
|
#include "base/base_export.h"
|
|
#include "base/callback.h"
|
|
#include "base/compiler_specific.h"
|
|
#include "base/macros.h"
|
|
#include "base/memory/ref_counted.h"
|
|
#include "base/sequenced_task_runner.h"
|
|
#include "base/synchronization/lock.h"
|
|
#include "base/threading/platform_thread.h"
|
|
#include "base/time/time.h"
|
|
|
|
namespace base {
|
|
|
|
// A DeferredSequencedTaskRunner is a subclass of SequencedTaskRunner that
|
|
// queues up all requests until the first call to Start() is issued.
|
|
// DeferredSequencedTaskRunner may be created in two ways:
|
|
// . with an explicit SequencedTaskRunner that the events are flushed to
|
|
// . without a SequencedTaskRunner. In this configuration the
|
|
// SequencedTaskRunner is supplied in StartWithTaskRunner().
|
|
class BASE_EXPORT DeferredSequencedTaskRunner : public SequencedTaskRunner {
|
|
public:
|
|
explicit DeferredSequencedTaskRunner(
|
|
scoped_refptr<SequencedTaskRunner> target_runner);
|
|
|
|
// Use this constructor when you don't have the target SequencedTaskRunner.
|
|
// When using this call StartWithTaskRunner().
|
|
DeferredSequencedTaskRunner();
|
|
|
|
// TaskRunner implementation
|
|
bool PostDelayedTask(const Location& from_here,
|
|
OnceClosure task,
|
|
TimeDelta delay) override;
|
|
bool RunsTasksInCurrentSequence() const override;
|
|
|
|
// SequencedTaskRunner implementation
|
|
bool PostNonNestableDelayedTask(const Location& from_here,
|
|
OnceClosure task,
|
|
TimeDelta delay) override;
|
|
|
|
// Start the execution - posts all queued tasks to the target executor. The
|
|
// deferred tasks are posted with their initial delay, meaning that the task
|
|
// execution delay is actually measured from Start.
|
|
// Fails when called a second time.
|
|
void Start();
|
|
|
|
// Same as Start(), but must be used with the no-arg constructor.
|
|
void StartWithTaskRunner(
|
|
scoped_refptr<SequencedTaskRunner> target_task_runner);
|
|
|
|
private:
|
|
struct DeferredTask {
|
|
DeferredTask();
|
|
DeferredTask(DeferredTask&& other);
|
|
~DeferredTask();
|
|
DeferredTask& operator=(DeferredTask&& other);
|
|
|
|
Location posted_from;
|
|
OnceClosure task;
|
|
// The delay this task was initially posted with.
|
|
TimeDelta delay;
|
|
bool is_non_nestable;
|
|
};
|
|
|
|
~DeferredSequencedTaskRunner() override;
|
|
|
|
// Both variants of Start() call into this.
|
|
void StartImpl();
|
|
|
|
// Creates a |Task| object and adds it to |deferred_tasks_queue_|.
|
|
void QueueDeferredTask(const Location& from_here,
|
|
OnceClosure task,
|
|
TimeDelta delay,
|
|
bool is_non_nestable);
|
|
|
|
// // Protects |started_| and |deferred_tasks_queue_|.
|
|
mutable Lock lock_;
|
|
|
|
const PlatformThreadId created_thread_id_;
|
|
|
|
bool started_ = false;
|
|
scoped_refptr<SequencedTaskRunner> target_task_runner_;
|
|
std::vector<DeferredTask> deferred_tasks_queue_;
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(DeferredSequencedTaskRunner);
|
|
};
|
|
|
|
} // namespace base
|
|
|
|
#endif // BASE_DEFERRED_SEQUENCED_TASK_RUNNER_H_
|