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// Copyright (c) 2012 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_TEST_TEST_SIMPLE_TASK_RUNNER_H_
#define BASE_TEST_TEST_SIMPLE_TASK_RUNNER_H_
#include <deque>
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/single_thread_task_runner.h"
#include "base/synchronization/lock.h"
#include "base/test/test_pending_task.h"
#include "base/threading/platform_thread.h"
namespace base {
class TimeDelta;
// TestSimpleTaskRunner is a simple TaskRunner implementation that can
// be used for testing. It implements SingleThreadTaskRunner as that
// interface implements SequencedTaskRunner, which in turn implements
// TaskRunner, so TestSimpleTaskRunner can be passed in to a function
// that accepts any *TaskRunner object.
//
// TestSimpleTaskRunner has the following properties which make it simple:
//
// - Tasks are simply stored in a queue in FIFO order, ignoring delay
// and nestability.
// - Tasks aren't guaranteed to be destroyed immediately after
// they're run.
//
// However, TestSimpleTaskRunner allows for reentrancy, in that it
// handles the running of tasks that in turn call back into itself
// (e.g., to post more tasks).
//
// Note that, like any TaskRunner, TestSimpleTaskRunner is
// ref-counted.
class TestSimpleTaskRunner : public SingleThreadTaskRunner {
public:
TestSimpleTaskRunner();
// SingleThreadTaskRunner implementation.
bool PostDelayedTask(const tracked_objects::Location& from_here,
OnceClosure task,
TimeDelta delay) override;
bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
OnceClosure task,
TimeDelta delay) override;
bool RunsTasksOnCurrentThread() const override;
std::deque<TestPendingTask> TakePendingTasks();
size_t NumPendingTasks() const;
bool HasPendingTask() const;
base::TimeDelta NextPendingTaskDelay() const;
base::TimeDelta FinalPendingTaskDelay() const;
// Clears the queue of pending tasks without running them.
void ClearPendingTasks();
// Runs each current pending task in order and clears the queue. Tasks posted
// by the tasks that run within this call do not run within this call. Can
// only be called on the thread that created this TestSimpleTaskRunner.
void RunPendingTasks();
// Runs pending tasks until the queue is empty. Can only be called on the
// thread that created this TestSimpleTaskRunner.
void RunUntilIdle();
protected:
~TestSimpleTaskRunner() override;
private:
// Thread on which this was instantiated.
const PlatformThreadRef thread_ref_ = PlatformThread::CurrentRef();
// Synchronizes access to |pending_tasks_|.
mutable Lock lock_;
std::deque<TestPendingTask> pending_tasks_;
DISALLOW_COPY_AND_ASSIGN(TestSimpleTaskRunner);
};
} // namespace base
#endif // BASE_TEST_TEST_SIMPLE_TASK_RUNNER_H_
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