| /* |
| * Copyright (C) 2014 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; |
| |
| import android.content.Context; |
| import android.os.Handler; |
| import android.os.Looper; |
| import android.os.Message; |
| import android.os.Messenger; |
| import android.os.Parcel; |
| import android.os.Parcelable; |
| import android.util.Log; |
| |
| import com.android.internal.util.AsyncChannel; |
| import com.android.internal.util.Protocol; |
| |
| import java.util.ArrayList; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| /** |
| * A Utility class for handling for communicating between bearer-specific |
| * code and ConnectivityService. |
| * |
| * A bearer may have more than one NetworkAgent if it can simultaneously |
| * support separate networks (IMS / Internet / MMS Apns on cellular, or |
| * perhaps connections with different SSID or P2P for Wi-Fi). |
| * |
| * @hide |
| */ |
| public abstract class NetworkAgent extends Handler { |
| private volatile AsyncChannel mAsyncChannel; |
| private final String LOG_TAG; |
| private static final boolean DBG = true; |
| private static final boolean VDBG = true; |
| private final Context mContext; |
| private final ArrayList<Message>mPreConnectedQueue = new ArrayList<Message>(); |
| |
| private static final int BASE = Protocol.BASE_NETWORK_AGENT; |
| |
| /** |
| * Sent by ConnectivityService to the NetworkAgent to inform it of |
| * suspected connectivity problems on its network. The NetworkAgent |
| * should take steps to verify and correct connectivity. |
| */ |
| public static final int CMD_SUSPECT_BAD = BASE; |
| |
| /** |
| * Sent by the NetworkAgent (note the EVENT vs CMD prefix) to |
| * ConnectivityService to pass the current NetworkInfo (connection state). |
| * Sent when the NetworkInfo changes, mainly due to change of state. |
| * obj = NetworkInfo |
| */ |
| public static final int EVENT_NETWORK_INFO_CHANGED = BASE + 1; |
| |
| /** |
| * Sent by the NetworkAgent to ConnectivityService to pass the current |
| * NetworkCapabilties. |
| * obj = NetworkCapabilities |
| */ |
| public static final int EVENT_NETWORK_CAPABILITIES_CHANGED = BASE + 2; |
| |
| /** |
| * Sent by the NetworkAgent to ConnectivityService to pass the current |
| * NetworkProperties. |
| * obj = NetworkProperties |
| */ |
| public static final int EVENT_NETWORK_PROPERTIES_CHANGED = BASE + 3; |
| |
| /** |
| * Sent by the NetworkAgent to ConnectivityService to pass the current |
| * network score. |
| * obj = network score Integer |
| */ |
| public static final int EVENT_NETWORK_SCORE_CHANGED = BASE + 4; |
| |
| public NetworkAgent(Looper looper, Context context, String logTag, NetworkInfo ni, |
| NetworkCapabilities nc, LinkProperties lp, int score) { |
| super(looper); |
| LOG_TAG = logTag; |
| mContext = context; |
| if (ni == null || nc == null || lp == null) { |
| throw new IllegalArgumentException(); |
| } |
| |
| if (DBG) log("Registering NetworkAgent"); |
| ConnectivityManager cm = (ConnectivityManager)mContext.getSystemService( |
| Context.CONNECTIVITY_SERVICE); |
| cm.registerNetworkAgent(new Messenger(this), new NetworkInfo(ni), |
| new LinkProperties(lp), new NetworkCapabilities(nc), score); |
| } |
| |
| @Override |
| public void handleMessage(Message msg) { |
| switch (msg.what) { |
| case AsyncChannel.CMD_CHANNEL_FULL_CONNECTION: { |
| if (mAsyncChannel != null) { |
| log("Received new connection while already connected!"); |
| } else { |
| if (DBG) log("NetworkAgent fully connected"); |
| AsyncChannel ac = new AsyncChannel(); |
| ac.connected(null, this, msg.replyTo); |
| ac.replyToMessage(msg, AsyncChannel.CMD_CHANNEL_FULLY_CONNECTED, |
| AsyncChannel.STATUS_SUCCESSFUL); |
| synchronized (mPreConnectedQueue) { |
| mAsyncChannel = ac; |
| for (Message m : mPreConnectedQueue) { |
| ac.sendMessage(m); |
| } |
| mPreConnectedQueue.clear(); |
| } |
| } |
| break; |
| } |
| case AsyncChannel.CMD_CHANNEL_DISCONNECT: { |
| if (DBG) log("CMD_CHANNEL_DISCONNECT"); |
| if (mAsyncChannel != null) mAsyncChannel.disconnect(); |
| break; |
| } |
| case AsyncChannel.CMD_CHANNEL_DISCONNECTED: { |
| if (DBG) log("NetworkAgent channel lost"); |
| // let the client know CS is done with us. |
| unwanted(); |
| synchronized (mPreConnectedQueue) { |
| mAsyncChannel = null; |
| } |
| break; |
| } |
| case CMD_SUSPECT_BAD: { |
| log("Unhandled Message " + msg); |
| break; |
| } |
| } |
| } |
| |
| private void queueOrSendMessage(int what, Object obj) { |
| synchronized (mPreConnectedQueue) { |
| if (mAsyncChannel != null) { |
| mAsyncChannel.sendMessage(what, obj); |
| } else { |
| Message msg = Message.obtain(); |
| msg.what = what; |
| msg.obj = obj; |
| mPreConnectedQueue.add(msg); |
| } |
| } |
| } |
| |
| /** |
| * Called by the bearer code when it has new LinkProperties data. |
| */ |
| public void sendLinkProperties(LinkProperties linkProperties) { |
| queueOrSendMessage(EVENT_NETWORK_PROPERTIES_CHANGED, new LinkProperties(linkProperties)); |
| } |
| |
| /** |
| * Called by the bearer code when it has new NetworkInfo data. |
| */ |
| public void sendNetworkInfo(NetworkInfo networkInfo) { |
| queueOrSendMessage(EVENT_NETWORK_INFO_CHANGED, new NetworkInfo(networkInfo)); |
| } |
| |
| /** |
| * Called by the bearer code when it has new NetworkCapabilities data. |
| */ |
| public void sendNetworkCapabilities(NetworkCapabilities networkCapabilities) { |
| queueOrSendMessage(EVENT_NETWORK_CAPABILITIES_CHANGED, |
| new NetworkCapabilities(networkCapabilities)); |
| } |
| |
| /** |
| * Called by the bearer code when it has a new score for this network. |
| */ |
| public void sendNetworkScore(int score) { |
| queueOrSendMessage(EVENT_NETWORK_SCORE_CHANGED, new Integer(score)); |
| } |
| |
| /** |
| * Called when ConnectivityService has indicated they no longer want this network. |
| * The parent factory should (previously) have received indication of the change |
| * as well, either canceling NetworkRequests or altering their score such that this |
| * network won't be immediately requested again. |
| */ |
| abstract protected void unwanted(); |
| |
| protected void log(String s) { |
| Log.d(LOG_TAG, "NetworkAgent: " + s); |
| } |
| } |