Use a weak pointer to post service control events and session change notifications.

remoting/base/stoppable.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 "remoting/base/stoppable.h"
-
-#include "base/message_loop.h"
-#include "base/single_thread_task_runner.h"
-
-namespace remoting {
-
-Stoppable::Stoppable(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
-    const base::Closure& stopped_callback)
-    : state_(kRunning),
-      stopped_callback_(stopped_callback),
-      task_runner_(task_runner) {
-}
-
-Stoppable::~Stoppable() {
-  CHECK_EQ(state_, kStopped);
-}
-
-void Stoppable::Stop() {
-  DCHECK(task_runner_->BelongsToCurrentThread());
-
-  if (state_ == kRunning) {
-    state_ = kStopping;
-  }
-
-  // DoStop() can be called multiple times.
-  DoStop();
-}
-
-void Stoppable::CompleteStopping() {
-  DCHECK(task_runner_->BelongsToCurrentThread());
-  DCHECK_EQ(state_, kStopping);
-
-  state_ = kStopped;
-  task_runner_->PostTask(FROM_HERE, stopped_callback_);
-}
-
-}  // namespace remoting