Implement a listener for host deletion notifications.

The directory server notifies the host (via the bot) when an entry is deleted (e.g. by clicking X on the webapp), and the host exits immediately (rather than up to 5 minutes later, when its next heartbeat failed).

BUG=163572


Review URL: https://chromiumcodereview.appspot.com/12045085

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@179533 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 59 insertions, 0 deletions

diff --git a/remoting/host/host_change_notification_listener.h b/remoting/host/host_change_notification_listener.h
new file mode 100644
index 0000000..19ee106
--- /dev/null
+++ b/remoting/host/host_change_notification_listener.h
@@ -0,0 +1,59 @@
+// Copyright (c) 2013 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 REMOTING_HOST_HOST_CHANGE_NOTIFICATION_LISTENER_H
+#define REMOTING_HOST_HOST_CHANGE_NOTIFICATION_LISTENER_H
+
+#include <string>
+
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "remoting/jingle_glue/signal_strategy.h"
+
+namespace buzz {
+class XmlElement;
+}  // namespace buzz
+
+namespace remoting {
+
+// HostChangeNotificationListener listens for messages from the remoting bot
+// indicating that its host entry has been changed in the directory.
+// If a message is received indicating that the host was deleted, it uses the
+// OnHostDeleted callback to shut down the host.
+class HostChangeNotificationListener : public SignalStrategy::Listener {
+ public:
+  class Listener {
+   protected:
+    virtual ~Listener() {}
+    // Invoked when a notification that the host was deleted is received.
+   public:
+    virtual void OnHostDeleted() = 0;
+  };
+
+  // Both listener and signal_strategy are expected to outlive this object.
+  HostChangeNotificationListener(Listener* listener,
+                                 const std::string& host_id,
+                                 SignalStrategy* signal_strategy);
+  virtual ~HostChangeNotificationListener();
+
+  // SignalStrategy::Listener interface.
+  virtual void OnSignalStrategyStateChange(
+      SignalStrategy::State state) OVERRIDE;
+  virtual bool OnSignalStrategyIncomingStanza(
+      const buzz::XmlElement* stanza) OVERRIDE;
+
+ private:
+  void OnHostDeleted();
+
+  Listener* listener_;
+  std::string host_id_;
+  SignalStrategy* signal_strategy_;
+  base::WeakPtrFactory<HostChangeNotificationListener> weak_factory_;
+  DISALLOW_COPY_AND_ASSIGN(HostChangeNotificationListener);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_HOST_CHANGE_NOTIFICATION_LISTENER_H