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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_TASK_THREAD_POOL_POOLED_TASK_RUNNER_DELEGATE_H_
#define BASE_TASK_THREAD_POOL_POOLED_TASK_RUNNER_DELEGATE_H_
#include "base/base_export.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool/job_task_source.h"
#include "base/task/thread_pool/sequence.h"
#include "base/task/thread_pool/task.h"
#include "base/task/thread_pool/task_source.h"
namespace base {
namespace internal {
// Delegate interface for PooledParallelTaskRunner and
// PooledSequencedTaskRunner.
class BASE_EXPORT PooledTaskRunnerDelegate {
public:
PooledTaskRunnerDelegate();
virtual ~PooledTaskRunnerDelegate();
// Returns true if the current PooledTaskRunnerDelegate instance in the
// process matches `delegate`. This is needed in case of unit tests wherein
// a TaskRunner outlives the ThreadPoolInstance that created it, in which case
// the current delegate would be null (and not match) or even have been
// re-initialized to a new delegate in a following test.
static bool MatchesCurrentDelegate(PooledTaskRunnerDelegate* delegate);
// Returns true if |task_source| currently running *must* return ASAP.
// Thread-safe but may return an outdated result (if a task unnecessarily
// yields due to this, it will simply be re-scheduled).
virtual bool ShouldYield(const TaskSource* task_source) = 0;
// Invoked when a |task| is posted to the PooledParallelTaskRunner or
// PooledSequencedTaskRunner. The implementation must post |task| to
// |sequence| within the appropriate priority queue, depending on |sequence|
// traits. Returns true if task was successfully posted.
virtual bool PostTaskWithSequence(Task task,
scoped_refptr<Sequence> sequence) = 0;
// Invoked when a task is posted as a Job. The implementation must add
// |task_source| to the appropriate priority queue, depending on |task_source|
// traits, if it's not there already. Returns true if task source was
// successfully enqueued or was already enqueued.
virtual bool EnqueueJobTaskSource(
scoped_refptr<JobTaskSource> task_source) = 0;
// Removes |task_source| from the priority queue.
virtual void RemoveJobTaskSource(
scoped_refptr<JobTaskSource> task_source) = 0;
// Invoked when the priority of |sequence|'s TaskRunner is updated. The
// implementation must update |sequence|'s priority to |priority|, then place
// |sequence| in the correct priority-queue position within the appropriate
// thread group.
virtual void UpdatePriority(scoped_refptr<TaskSource> task_source,
TaskPriority priority) = 0;
virtual void UpdateJobPriority(scoped_refptr<TaskSource> task_source,
TaskPriority priority) = 0;
};
} // namespace internal
} // namespace base
#endif // BASE_TASK_THREAD_POOL_POOLED_TASK_RUNNER_DELEGATE_H_
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