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