Implementation of SequencedTaskRunner based on SequencedWorkerPool.

base/threading/sequenced_worker_pool_task_runner.cc

+// 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.
+
+#include "base/threading/sequenced_worker_pool_task_runner.h"
+
+#include "base/callback.h"
+#include "base/location.h"
+#include "base/logging.h"
+
+namespace base {
+
+SequencedWorkerPoolTaskRunner::SequencedWorkerPoolTaskRunner(
+    const scoped_refptr<SequencedWorkerPool>& pool,
+    SequencedWorkerPool::SequenceToken token)
+    : pool_(pool),
+      token_(token) {
+}
+
+SequencedWorkerPoolTaskRunner::~SequencedWorkerPoolTaskRunner() {
+}
+
+bool SequencedWorkerPoolTaskRunner::PostDelayedTask(
+    const tracked_objects::Location& from_here,
+    const Closure& task,
+    int64 delay_ms) {
+  return PostDelayedTaskAssertZeroDelay(from_here, task, delay_ms);
+}
+
+bool SequencedWorkerPoolTaskRunner::PostDelayedTask(
+    const tracked_objects::Location& from_here,
+    const Closure& task,
+    TimeDelta delay) {
+  return PostDelayedTaskAssertZeroDelay(from_here, task, delay);
+}
+
+bool SequencedWorkerPoolTaskRunner::RunsTasksOnCurrentThread() const {
+  return pool_->RunsTasksOnCurrentThread();
+}
+
+bool SequencedWorkerPoolTaskRunner::PostNonNestableDelayedTask(
+    const tracked_objects::Location& from_here,
+    const Closure& task,
+    int64 delay_ms) {
+  return PostDelayedTaskAssertZeroDelay(from_here, task, delay_ms);
+}
+
+bool SequencedWorkerPoolTaskRunner::PostNonNestableDelayedTask(
+    const tracked_objects::Location& from_here,
+    const Closure& task,
+    TimeDelta delay) {
+  return PostDelayedTaskAssertZeroDelay(from_here, task, delay);
+}
+
+bool SequencedWorkerPoolTaskRunner::PostDelayedTaskAssertZeroDelay(
+    const tracked_objects::Location& from_here,
+    const Closure& task,
+    int64 delay_ms) {
+  // TODO(francoisk777@gmail.com): Change the following two statements once
+  // SequencedWorkerPool supports non-zero delays.
+  DCHECK_EQ(delay_ms, 0)
+      << "SequencedWorkerPoolTaskRunner does not yet support non-zero delays";
+  return pool_->PostSequencedWorkerTask(token_, from_here, task);
+}
+
+bool SequencedWorkerPoolTaskRunner::PostDelayedTaskAssertZeroDelay(
+    const tracked_objects::Location& from_here,
+    const Closure& task,
+    TimeDelta delay) {
+  return PostDelayedTaskAssertZeroDelay(from_here,
+                                        task,
+                                        delay.InMillisecondsRoundedUp());
+}
+
+}  // namespace base