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// 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.
#include "base/deferred_sequenced_task_runner.h"
#include "base/bind.h"
#include "base/logging.h"
namespace base {
DeferredSequencedTaskRunner::DeferredTask::DeferredTask()
: is_non_nestable(false) {
}
DeferredSequencedTaskRunner::DeferredTask::~DeferredTask() {
}
DeferredSequencedTaskRunner::DeferredSequencedTaskRunner(
const scoped_refptr<SequencedTaskRunner>& target_task_runner)
: started_(false),
target_task_runner_(target_task_runner) {
}
DeferredSequencedTaskRunner::~DeferredSequencedTaskRunner() {
}
bool DeferredSequencedTaskRunner::PostDelayedTask(
const tracked_objects::Location& from_here,
const Closure& task,
TimeDelta delay) {
AutoLock lock(lock_);
if (started_) {
DCHECK(deferred_tasks_queue_.empty());
return target_task_runner_->PostDelayedTask(from_here, task, delay);
}
QueueDeferredTask(from_here, task, delay, false /* is_non_nestable */);
return true;
}
bool DeferredSequencedTaskRunner::RunsTasksOnCurrentThread() const {
return target_task_runner_->RunsTasksOnCurrentThread();
}
bool DeferredSequencedTaskRunner::PostNonNestableDelayedTask(
const tracked_objects::Location& from_here,
const Closure& task,
TimeDelta delay) {
AutoLock lock(lock_);
if (started_) {
DCHECK(deferred_tasks_queue_.empty());
return target_task_runner_->PostNonNestableDelayedTask(from_here,
task,
delay);
}
QueueDeferredTask(from_here, task, delay, true /* is_non_nestable */);
return true;
}
void DeferredSequencedTaskRunner::QueueDeferredTask(
const tracked_objects::Location& from_here,
const Closure& task,
TimeDelta delay,
bool is_non_nestable) {
DeferredTask deferred_task;
deferred_task.posted_from = from_here;
deferred_task.task = task;
deferred_task.delay = delay;
deferred_task.is_non_nestable = is_non_nestable;
deferred_tasks_queue_.push_back(deferred_task);
}
void DeferredSequencedTaskRunner::Start() {
AutoLock lock(lock_);
DCHECK(!started_);
started_ = true;
for (std::vector<DeferredTask>::iterator i = deferred_tasks_queue_.begin();
i != deferred_tasks_queue_.end();
++i) {
const DeferredTask& task = *i;
if (task.is_non_nestable) {
target_task_runner_->PostNonNestableDelayedTask(task.posted_from,
task.task,
task.delay);
} else {
target_task_runner_->PostDelayedTask(task.posted_from,
task.task,
task.delay);
}
// Replace the i-th element in the |deferred_tasks_queue_| with an empty
// |DelayedTask| to ensure that |task| is destroyed before the next task
// is posted.
*i = DeferredTask();
}
deferred_tasks_queue_.clear();
}
} // namespace base
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