Yao Chen | dacd724 | 2016-01-26 14:42:42 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package com.android.car; |
| 17 | |
| 18 | import android.os.Handler; |
| 19 | import android.os.Message; |
| 20 | import android.util.Log; |
| 21 | |
| 22 | import com.android.internal.annotations.GuardedBy; |
| 23 | import com.android.internal.annotations.VisibleForTesting; |
| 24 | |
| 25 | import java.lang.ref.WeakReference; |
| 26 | |
| 27 | /** |
| 28 | * An wrapper class that can be backed by a real DeviceIdleController or a mocked one. |
| 29 | */ |
| 30 | public abstract class DeviceIdleControllerWrapper { |
| 31 | private static final String TAG = "Garage_DeviceIdleWrapper"; |
| 32 | |
| 33 | private static final int MSG_REPORT_ACTIVE = 1; |
| 34 | |
| 35 | @VisibleForTesting |
| 36 | protected WeakReference<DeviceMaintenanceActivityListener> mListener; |
| 37 | |
| 38 | public interface DeviceMaintenanceActivityListener { |
| 39 | public void onMaintenanceActivityChanged(boolean active); |
| 40 | } |
| 41 | private final Object mLock = new Object(); |
| 42 | @GuardedBy("mLock") |
| 43 | private boolean mActive; |
| 44 | |
| 45 | private Handler mHandler = new IdleControllerHandler(); |
| 46 | |
| 47 | private class IdleControllerHandler extends Handler { |
| 48 | @Override |
| 49 | public void handleMessage(Message msg) { |
| 50 | switch (msg.what) { |
| 51 | case MSG_REPORT_ACTIVE: |
| 52 | boolean active = msg.arg1 == 1; |
| 53 | if (mListener.get() != null) { |
| 54 | mListener.get().onMaintenanceActivityChanged(active); |
| 55 | } |
| 56 | break; |
| 57 | } |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | public boolean startTracking(DeviceMaintenanceActivityListener listener) { |
| 62 | synchronized (mLock) { |
| 63 | mListener = new WeakReference<DeviceMaintenanceActivityListener>(listener); |
| 64 | mActive = startLocked(); |
| 65 | return mActive; |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | protected abstract boolean startLocked(); |
| 70 | |
| 71 | public abstract void stopTracking(); |
| 72 | |
| 73 | @VisibleForTesting |
| 74 | protected void reportActiveLocked(final boolean active) { |
| 75 | // post to a handler instead of calling the callback directly to avoid potential deadlock. |
| 76 | mHandler.sendMessage(mHandler.obtainMessage(MSG_REPORT_ACTIVE, active ? 1 : 0, 0)); |
| 77 | } |
| 78 | |
| 79 | @VisibleForTesting |
| 80 | protected void setMaintenanceActivity(final boolean active) { |
| 81 | synchronized (mLock) { |
| 82 | if (mActive == active) { |
| 83 | return; |
| 84 | } |
| 85 | mActive = active; |
| 86 | |
| 87 | if (mListener.get() == null) { |
| 88 | // do cleanup if the listener has gone and did not call release. |
| 89 | stopTracking(); |
| 90 | return; |
| 91 | } |
| 92 | reportActiveLocked(active); |
| 93 | } |
| 94 | } |
| 95 | } |