Make NotificationService an interface in the content namespace, and switch callers to use it. Move the implementation to content/browser. Stop creating it in all child processes since it's only used in the browser.

BUG=98716
Review URL: http://codereview.chromium.org/8342048

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@106403 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 92 insertions, 0 deletions

diff --git a/content/browser/notification_service_impl.h b/content/browser/notification_service_impl.h
new file mode 100644
index 0000000..0898234
--- /dev/null
+++ b/content/browser/notification_service_impl.h
@@ -0,0 +1,92 @@
+// Copyright (c) 2011 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.
+
+#ifndef CONTENT_PUBLIC_BROWSER_NOTIFICATION_SERVICE_IMPL_H_
+#define CONTENT_PUBLIC_BROWSER_NOTIFICATION_SERVICE_IMPL_H_
+#pragma once
+
+#include <map>
+
+#include "base/observer_list.h"
+#include "content/common/content_export.h"
+#include "content/public/browser/notification_service.h"
+
+namespace content {
+class NotificationObserver;
+class NotificationRegistrar;
+}
+
+class NotificationServiceImpl : public content::NotificationService {
+ public:
+  static NotificationServiceImpl* current();
+
+  // Normally instantiated when the thread is created.  Not all threads have
+  // a NotificationService.  Only one instance should be created per thread.
+  NotificationServiceImpl();
+  virtual ~NotificationServiceImpl();
+
+  // content::NotificationService
+  virtual void Notify(int type,
+              const content::NotificationSource& source,
+              const content::NotificationDetails& details);
+
+ private:
+  friend class content::NotificationRegistrar;
+
+  typedef ObserverList<content::NotificationObserver> NotificationObserverList;
+  typedef std::map<uintptr_t, NotificationObserverList*> NotificationSourceMap;
+  typedef std::map<int, NotificationSourceMap> NotificationObserverMap;
+  typedef std::map<int, int> NotificationObserverCount;
+
+  // Convenience function to determine whether a source has a
+  // NotificationObserverList in the given map;
+  static bool HasKey(const NotificationSourceMap& map,
+                     const content::NotificationSource& source);
+
+  // NOTE: Rather than using this directly, you should use a
+  // NotificationRegistrar.
+  //
+  // Registers a NotificationObserver to be called whenever a matching
+  // notification is posted.  Observer is a pointer to an object subclassing
+  // NotificationObserver to be notified when an event matching the other two
+  // parameters is posted to this service.  Type is the type of events to be
+  // notified about (or content::NOTIFICATION_ALL to receive events of all
+  // types).
+  // Source is a NotificationSource object (created using
+  // "Source<classname>(pointer)"), if this observer only wants to
+  // receive events from that object, or NotificationService::AllSources()
+  // to receive events from all sources.
+  //
+  // A given observer can be registered only once for each combination of
+  // type and source.  If the same object is registered more than once,
+  // it must be removed for each of those combinations of type and source later.
+  //
+  // The caller retains ownership of the object pointed to by observer.
+  void AddObserver(content::NotificationObserver* observer,
+                   int type, const content::NotificationSource& source);
+
+  // NOTE: Rather than using this directly, you should use a
+  // NotificationRegistrar.
+  //
+  // Removes the object pointed to by observer from receiving notifications
+  // that match type and source.  If no object matching the parameters is
+  // currently registered, this method is a no-op.
+  void RemoveObserver(content::NotificationObserver* observer,
+                      int type, const content::NotificationSource& source);
+
+  // Keeps track of the observers for each type of notification.
+  // Until we get a prohibitively large number of notification types,
+  // a simple array is probably the fastest way to dispatch.
+  NotificationObserverMap observers_;
+
+#ifndef NDEBUG
+  // Used to check to see that AddObserver and RemoveObserver calls are
+  // balanced.
+  NotificationObserverCount observer_counts_;
+#endif
+
+  DISALLOW_COPY_AND_ASSIGN(NotificationServiceImpl);
+};
+
+#endif  // CONTENT_PUBLIC_BROWSER_NOTIFICATION_SERVICE_IMPL_H_