NetworkManagementService: Introduce INetworkManagementEventObserver

  Introduce a callback event observer which can be registered on the
INetworkManagementService instance to receive events from the service.

Signed-off-by: San Mehat <san@google.com>
diff --git a/core/java/android/net/INetworkManagementEventObserver.aidl b/core/java/android/net/INetworkManagementEventObserver.aidl
new file mode 100644
index 0000000..d30b63d
--- /dev/null
+++ b/core/java/android/net/INetworkManagementEventObserver.aidl
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.net;
+
+/**
+ * Callback class for receiving events from an INetworkManagementService
+ *
+ * @hide
+ */
+interface INetworkManagementEventObserver {
+    /**
+     * Interface link status has changed.
+     *
+     * @param iface The interface.
+     * @param link True if link is up.
+     */
+    void interfaceLinkStatusChanged(String iface, boolean link);
+
+    /**
+     * An interface has been added to the system
+     *
+     * @param iface The interface.
+     */
+    void interfaceAdded(String iface);
+
+    /**
+     * An interface has been removed from the system
+     *
+     * @param iface The interface.
+     */
+    void interfaceRemoved(String iface);
+}
diff --git a/core/java/android/os/INetworkManagementService.aidl b/core/java/android/os/INetworkManagementService.aidl
index 49abb4d..e4ec098 100644
--- a/core/java/android/os/INetworkManagementService.aidl
+++ b/core/java/android/os/INetworkManagementService.aidl
@@ -18,6 +18,7 @@
 package android.os;
 
 import android.net.InterfaceConfiguration;
+import android.net.INetworkManagementEventObserver;
 
 /**
  * @hide
@@ -29,6 +30,16 @@
      **/
 
     /**
+     * Register an observer to receive events
+     */
+    void registerObserver(INetworkManagementEventObserver obs);
+
+    /**
+     * Unregister an observer from receiving events.
+     */
+    void unregisterObserver(INetworkManagementEventObserver obs);
+
+    /**
      * Returns a list of currently known network interfaces
      */
     String[] listInterfaces();