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/*
* 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 com.android.server.task.controllers;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.ServiceManager;
import android.os.UserHandle;
import android.util.Slog;
import com.android.server.ConnectivityService;
import com.android.server.task.StateChangedListener;
import com.android.server.task.TaskManagerService;
import java.io.PrintWriter;
import java.util.LinkedList;
import java.util.List;
/**
* Handles changes in connectivity.
* We are only interested in metered vs. unmetered networks, and we're interested in them on a
* per-user basis.
*/
public class ConnectivityController extends StateController implements
ConnectivityManager.OnNetworkActiveListener {
private static final String TAG = "TaskManager.Conn";
private final List<TaskStatus> mTrackedTasks = new LinkedList<TaskStatus>();
private final BroadcastReceiver mConnectivityChangedReceiver =
new ConnectivityChangedReceiver();
/** Singleton. */
private static ConnectivityController mSingleton;
private static Object sCreationLock = new Object();
/** Track whether the latest active network is metered. */
private boolean mNetworkUnmetered;
/** Track whether the latest active network is connected. */
private boolean mNetworkConnected;
public static ConnectivityController get(TaskManagerService taskManager) {
synchronized (sCreationLock) {
if (mSingleton == null) {
mSingleton = new ConnectivityController(taskManager, taskManager.getContext());
}
return mSingleton;
}
}
private ConnectivityController(StateChangedListener stateChangedListener, Context context) {
super(stateChangedListener, context);
// Register connectivity changed BR.
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
mContext.registerReceiverAsUser(
mConnectivityChangedReceiver, UserHandle.ALL, intentFilter, null, null);
ConnectivityService cs =
(ConnectivityService)ServiceManager.getService(Context.CONNECTIVITY_SERVICE);
if (cs != null) {
if (cs.getActiveNetworkInfo() != null) {
mNetworkConnected = cs.getActiveNetworkInfo().isConnected();
}
mNetworkUnmetered = mNetworkConnected && !cs.isActiveNetworkMetered();
}
}
@Override
public void maybeStartTrackingTask(TaskStatus taskStatus) {
if (taskStatus.hasConnectivityConstraint() || taskStatus.hasUnmeteredConstraint()) {
synchronized (mTrackedTasks) {
taskStatus.connectivityConstraintSatisfied.set(mNetworkConnected);
taskStatus.unmeteredConstraintSatisfied.set(mNetworkUnmetered);
mTrackedTasks.add(taskStatus);
}
}
}
@Override
public void maybeStopTrackingTask(TaskStatus taskStatus) {
if (taskStatus.hasConnectivityConstraint() || taskStatus.hasUnmeteredConstraint()) {
synchronized (mTrackedTasks) {
mTrackedTasks.remove(taskStatus);
}
}
}
/**
* @param userId Id of the user for whom we are updating the connectivity state.
*/
private void updateTrackedTasks(int userId) {
synchronized (mTrackedTasks) {
boolean changed = false;
for (TaskStatus ts : mTrackedTasks) {
if (ts.getUserId() != userId) {
continue;
}
boolean prevIsConnected =
ts.connectivityConstraintSatisfied.getAndSet(mNetworkConnected);
boolean prevIsMetered = ts.unmeteredConstraintSatisfied.getAndSet(mNetworkUnmetered);
if (prevIsConnected != mNetworkConnected || prevIsMetered != mNetworkUnmetered) {
changed = true;
}
}
if (changed) {
mStateChangedListener.onControllerStateChanged();
}
}
}
/**
* We know the network has just come up. We want to run any tasks that are ready.
*/
public synchronized void onNetworkActive() {
synchronized (mTrackedTasks) {
for (TaskStatus ts : mTrackedTasks) {
if (ts.isReady()) {
if (DEBUG) {
Slog.d(TAG, "Running " + ts + " due to network activity.");
}
mStateChangedListener.onRunTaskNow(ts);
}
}
}
}
class ConnectivityChangedReceiver extends BroadcastReceiver {
/**
* We'll receive connectivity changes for each user here, which we process independently.
* We are only interested in the active network here. We're only interested in the active
* network, b/c the end result of this will be for apps to try to hit the network.
* @param context The Context in which the receiver is running.
* @param intent The Intent being received.
*/
// TODO: Test whether this will be called twice for each user.
@Override
public void onReceive(Context context, Intent intent) {
if (DEBUG) {
Slog.d(TAG, "Received connectivity event: " + intent.getAction() + " u"
+ context.getUserId());
}
final String action = intent.getAction();
if (action.equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
final int networkType =
intent.getIntExtra(ConnectivityManager.EXTRA_NETWORK_TYPE,
ConnectivityManager.TYPE_NONE);
// Connectivity manager for THIS context - important!
final ConnectivityManager connManager = (ConnectivityManager)
context.getSystemService(Context.CONNECTIVITY_SERVICE);
final NetworkInfo activeNetwork = connManager.getActiveNetworkInfo();
final int userid = context.getUserId();
// This broadcast gets sent a lot, only update if the active network has changed.
if (activeNetwork == null) {
mNetworkUnmetered = false;
mNetworkConnected = false;
updateTrackedTasks(userid);
} else if (activeNetwork.getType() == networkType) {
mNetworkUnmetered = false;
mNetworkConnected = !intent.getBooleanExtra(
ConnectivityManager.EXTRA_NO_CONNECTIVITY, false);
if (mNetworkConnected) { // No point making the call if we know there's no conn.
mNetworkUnmetered = !connManager.isActiveNetworkMetered();
}
updateTrackedTasks(userid);
}
} else {
if (DEBUG) {
Slog.d(TAG, "Unrecognised action in intent: " + action);
}
}
}
};
@Override
public void dumpControllerState(PrintWriter pw) {
pw.println("Conn.");
pw.println("connected: " + mNetworkConnected + " unmetered: " + mNetworkUnmetered);
for (TaskStatus ts: mTrackedTasks) {
pw.println(String.valueOf(ts.hashCode()).substring(0, 3) + ".."
+ ": C=" + ts.hasConnectivityConstraint()
+ ", UM=" + ts.hasUnmeteredConstraint());
}
}
}
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