Support for process-wide incidents in the safe browsing incident reporting service.

chrome/browser/safe_browsing/delayed_callback_runner.cc

+// Copyright 2014 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 "chrome/browser/safe_browsing/delayed_callback_runner.h"
+
+#include "base/location.h"
+
+namespace safe_browsing {
+
+DelayedCallbackRunner::DelayedCallbackRunner(
+    base::TimeDelta delay,
+    const scoped_refptr<base::TaskRunner>& task_runner)
+    : task_runner_(task_runner),
+      next_callback_(callbacks_.end()),
+      timer_(FROM_HERE, delay, this, &DelayedCallbackRunner::OnTimer) {
+}
+
+DelayedCallbackRunner::~DelayedCallbackRunner() {
+}
+
+void DelayedCallbackRunner::RegisterCallback(const base::Closure& callback) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  callbacks_.push_back(callback);
+}
+
+void DelayedCallbackRunner::Start() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  // Nothing to do if the runner is already running or nothing has been added.
+  if (next_callback_ != callbacks_.end() || callbacks_.empty())
+    return;
+
+  // Prime the system with the first callback.
+  next_callback_ = callbacks_.begin();
+
+  // Point the starter pistol in the air and pull the trigger.
+  timer_.Reset();
+}
+
+void DelayedCallbackRunner::OnTimer() {
+  // Run the next callback on the task runner.
+  task_runner_->PostTask(FROM_HERE, *next_callback_);
+
+  // Remove this callback and get ready for the next if there is one.
+  next_callback_ = callbacks_.erase(next_callback_);
+  if (next_callback_ != callbacks_.end())
+    timer_.Reset();
+}
+
+}  // namespace safe_browsing