Introducing ResumeLibrary to track system resume signal

chrome/browser/chromeos/cros/resume_library.cc

+// Copyright (c) 2010 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/chromeos/cros/resume_library.h"
+
+#include "base/message_loop.h"
+#include "base/observer_list.h"
+#include "chrome/browser/browser_thread.h"
+#include "chrome/browser/chromeos/cros/cros_library.h"
+#include "third_party/cros/chromeos_resume.h"
+
+namespace chromeos {
+
+class ResumeLibraryImpl : public ResumeLibrary {
+ public:
+  ResumeLibraryImpl() : connection_(NULL) {
+    if (CrosLibrary::Get()->EnsureLoaded())
+      Init();
+  }
+
+  ~ResumeLibraryImpl() {
+    if (connection_) {
+      chromeos::DisconnectResume(connection_);
+      connection_ = NULL;
+    }
+  }
+
+  void AddObserver(Observer* observer) {
+    observers_.AddObserver(observer);
+  }
+
+  void RemoveObserver(Observer* observer) {
+    observers_.RemoveObserver(observer);
+  }
+
+ private:
+  static void OnSystemResumedHandler(void* object) {
+    ResumeLibraryImpl* self = static_cast<ResumeLibraryImpl*>(object);
+    self->OnSystemResumed();
+  }
+
+  void Init() {
+    DCHECK(!connection_) << "Already intialized";
+    connection_ = chromeos::MonitorResume(&OnSystemResumedHandler, this);
+  }
+
+  void OnSystemResumed() {
+    // Make sure we run on the UI thread.
+    if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
+      BrowserThread::PostTask(
+          BrowserThread::UI, FROM_HERE,
+          NewRunnableMethod(this,
+                            &ResumeLibraryImpl::OnSystemResumed));
+      return;
+    }
+
+    FOR_EACH_OBSERVER(Observer,

[Nikita (slow), 2011/02/11 11:54:51]

nit: could fit into 1 line?

[glotov, 2011/02/11 18:20:56]

Done.

+                      observers_,
+                      SystemResumed());
+  }
+
+  chromeos::ResumeConnection connection_;
+
+  ObserverList<Observer> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(ResumeLibraryImpl);
+};
+
+class ResumeLibraryStubImpl : public ResumeLibrary {
+ public:
+  ResumeLibraryStubImpl() {}
+  ~ResumeLibraryStubImpl() {}
+  void AddObserver(Observer* observer) {}
+  void RemoveObserver(Observer* observer) {}
+};
+
+// static
+ResumeLibrary* ResumeLibrary::GetImpl(bool stub) {
+  if (stub)
+    return new ResumeLibraryStubImpl();
+  else
+    return new ResumeLibraryImpl();
+}
+
+}  // namespace chromeos
+
+// Needed for NewRunnableMethod() call above.

[Nikita (slow), 2011/02/11 11:54:51]

Should mention that this class is Singleton.

[glotov, 2011/02/11 18:20:56]

Done.

+DISABLE_RUNNABLE_METHOD_REFCOUNT(chromeos::ResumeLibraryImpl);