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100 lines
3.2 KiB
C++
100 lines
3.2 KiB
C++
// Copyright 2016 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_TASK_SCHEDULER_TEST_TASK_FACTORY_H_
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#define BASE_TASK_SCHEDULER_TEST_TASK_FACTORY_H_
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#include <stddef.h>
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#include <unordered_set>
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#include "base/callback_forward.h"
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#include "base/macros.h"
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#include "base/memory/ref_counted.h"
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#include "base/synchronization/condition_variable.h"
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#include "base/synchronization/lock.h"
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#include "base/task_runner.h"
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#include "base/task_scheduler/task_traits.h"
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#include "base/task_scheduler/test_utils.h"
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#include "base/threading/thread_checker_impl.h"
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namespace base {
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namespace internal {
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namespace test {
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// A TestTaskFactory posts tasks to a TaskRunner and verifies that they run as
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// expected. Generates a test failure when:
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// - The RunsTasksInCurrentSequence() method of the TaskRunner returns false on
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// a thread on which a Task is run.
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// - The TaskRunnerHandles set in the context of the task don't match what's
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// expected for the tested ExecutionMode.
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// - The ExecutionMode of the TaskRunner is SEQUENCED or SINGLE_THREADED and
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// Tasks don't run in posting order.
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// - The ExecutionMode of the TaskRunner is SINGLE_THREADED and Tasks don't run
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// on the same thread.
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// - A Task runs more than once.
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class TestTaskFactory {
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public:
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enum class PostNestedTask {
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YES,
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NO,
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};
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// Constructs a TestTaskFactory that posts tasks to |task_runner|.
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// |execution_mode| is the ExecutionMode of |task_runner|.
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TestTaskFactory(scoped_refptr<TaskRunner> task_runner,
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ExecutionMode execution_mode);
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~TestTaskFactory();
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// Posts a task. The posted task will:
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// - Post a new task if |post_nested_task| is YES. The nested task won't run
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// |after_task_closure|.
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// - Verify conditions in which the task runs (see potential failures above).
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// - Run |after_task_closure| if it is not null.
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bool PostTask(PostNestedTask post_nested_task,
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const Closure& after_task_closure);
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// Waits for all tasks posted by PostTask() to start running. It is not
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// guaranteed that the tasks have completed their execution when this returns.
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void WaitForAllTasksToRun() const;
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const TaskRunner* task_runner() const { return task_runner_.get(); }
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private:
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void RunTaskCallback(size_t task_index,
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PostNestedTask post_nested_task,
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const Closure& after_task_closure);
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// Synchronizes access to all members.
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mutable Lock lock_;
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// Condition variable signaled when a task runs.
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mutable ConditionVariable cv_;
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// Task runner through which this factory posts tasks.
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const scoped_refptr<TaskRunner> task_runner_;
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// Execution mode of |task_runner_|.
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const ExecutionMode execution_mode_;
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// Number of tasks posted by PostTask().
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size_t num_posted_tasks_ = 0;
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// Indexes of tasks that ran.
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std::unordered_set<size_t> ran_tasks_;
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// Used to verify that all tasks run on the same thread when |execution_mode_|
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// is SINGLE_THREADED.
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ThreadCheckerImpl thread_checker_;
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DISALLOW_COPY_AND_ASSIGN(TestTaskFactory);
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};
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} // namespace test
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} // namespace internal
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} // namespace base
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#endif // BASE_TASK_SCHEDULER_TEST_TASK_FACTORY_H_
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