Detects network changes. Only for Mac OS X so far. Hooks up TCPClientSocketPool to flush idle sockets on IP address change.

BUG=http://crbug.com/26156
TEST=Run chrome with both network cable and wireless on.  Go to www.google.com, twice.  Verify second time via chrome://net-internals that the second request did not need a TCP_CONNECT_JOB, since we reused idle sockets.  Unplug network cable.  This should flush idle sockets.  Go back to www.google.com.  Check chrome://net-internals.  Verify that there is a TCP_CONNECT_JOB for that request, because there was no idle socket to reuse.

Review URL: http://codereview.chromium.org/460149

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@35107 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 56 insertions, 0 deletions

diff --git a/net/base/network_change_notifier.h b/net/base/network_change_notifier.h
new file mode 100644
index 0000000..d66830a
--- /dev/null
+++ b/net/base/network_change_notifier.h
@@ -0,0 +1,56 @@
+// Copyright (c) 2009 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 NET_BASE_NETWORK_CHANGE_NOTIFIER_H_
+#define NET_BASE_NETWORK_CHANGE_NOTIFIER_H_
+
+#include "base/basictypes.h"
+#include "base/ref_counted.h"
+
+namespace net {
+
+// NetworkChangeNotifier monitors the system for network changes, and notifies
+// observers on those events.
+class NetworkChangeNotifier : public base::RefCounted<NetworkChangeNotifier> {
+ public:
+  class Observer {
+   public:
+    virtual ~Observer() {}
+
+    // Will be called when the IP address of the primary interface changes.
+    // This includes when the primary interface itself changes.
+    virtual void OnIPAddressChanged() = 0;
+
+   protected:
+    Observer() {}
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(Observer);
+  };
+
+  NetworkChangeNotifier() {}
+
+  // These functions add and remove observers to/from the NetworkChangeNotifier.
+  // Each call to AddObserver() must be matched with a corresponding call to
+  // RemoveObserver() with the same parameter.  Observers must remove themselves
+  // before they get deleted, otherwise the NetworkChangeNotifier may try to
+  // notify the wrong object.
+  virtual void AddObserver(Observer* observer) = 0;
+  virtual void RemoveObserver(Observer* observer) = 0;
+
+  // This will create the platform specific default NetworkChangeNotifier.
+  static scoped_refptr<NetworkChangeNotifier>
+      CreateDefaultNetworkChangeNotifier();
+
+ protected:
+  friend class base::RefCounted<NetworkChangeNotifier>;
+  virtual ~NetworkChangeNotifier() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifier);
+};
+
+}  // namespace net
+
+#endif  // NET_BASE_NETWORK_CHANGE_NOTIFIER_H_