Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -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 | */ |
Pavel Maltsev | 0477e29 | 2016-05-27 12:22:36 -0700 | [diff] [blame^] | 16 | package android.car.cluster.renderer; |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 17 | |
| 18 | import android.annotation.Nullable; |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 19 | import android.car.navigation.CarNavigationInstrumentCluster; |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 20 | import android.graphics.Bitmap; |
| 21 | import android.os.Handler; |
| 22 | import android.os.Looper; |
| 23 | import android.os.Message; |
| 24 | |
Pavel Maltsev | 0477e29 | 2016-05-27 12:22:36 -0700 | [diff] [blame^] | 25 | import java.lang.ref.WeakReference; |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 26 | import java.util.concurrent.CountDownLatch; |
| 27 | |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 28 | /** |
| 29 | * A wrapper over {@link NavigationRenderer} that runs all its methods in the context of provided |
| 30 | * looper. It is guaranteed that all calls will be invoked in order they were called. |
| 31 | */ |
Pavel Maltsev | 0477e29 | 2016-05-27 12:22:36 -0700 | [diff] [blame^] | 32 | /* package */ class ThreadSafeNavigationRenderer extends NavigationRenderer { |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 33 | |
| 34 | private final Handler mHandler; |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 35 | private final NavigationRenderer mRenderer; |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 36 | |
| 37 | private final static int MSG_NAV_START = 1; |
| 38 | private final static int MSG_NAV_STOP = 2; |
| 39 | private final static int MSG_NAV_NEXT_TURN = 3; |
| 40 | private final static int MSG_NAV_NEXT_TURN_DISTANCE = 4; |
| 41 | |
| 42 | /** Creates thread-safe {@link NavigationRenderer}. Returns null if renderer == null */ |
| 43 | @Nullable |
Pavel Maltsev | 0477e29 | 2016-05-27 12:22:36 -0700 | [diff] [blame^] | 44 | static NavigationRenderer createFor(Looper looper, NavigationRenderer renderer) { |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 45 | return renderer == null ? null : new ThreadSafeNavigationRenderer(looper, renderer); |
| 46 | } |
| 47 | |
| 48 | private ThreadSafeNavigationRenderer(Looper looper, NavigationRenderer renderer) { |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 49 | mRenderer = renderer; |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 50 | mHandler = new NavigationRendererHandler(looper, renderer); |
| 51 | } |
| 52 | |
| 53 | @Override |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 54 | public CarNavigationInstrumentCluster getNavigationProperties() { |
Pavel Maltsev | 0477e29 | 2016-05-27 12:22:36 -0700 | [diff] [blame^] | 55 | if (mHandler.getLooper() == Looper.myLooper()) { |
| 56 | return mRenderer.getNavigationProperties(); |
| 57 | } else { |
| 58 | return runAndWaitResult(mHandler, |
| 59 | new RunnableWithResult<CarNavigationInstrumentCluster>() { |
| 60 | @Override |
| 61 | protected CarNavigationInstrumentCluster createResult() { |
| 62 | return mRenderer.getNavigationProperties(); |
| 63 | } |
| 64 | }); |
| 65 | } |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 66 | } |
| 67 | |
| 68 | @Override |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 69 | public void onStartNavigation() { |
| 70 | mHandler.sendMessage(mHandler.obtainMessage(MSG_NAV_START)); |
| 71 | } |
| 72 | |
| 73 | @Override |
| 74 | public void onStopNavigation() { |
| 75 | mHandler.sendMessage(mHandler.obtainMessage(MSG_NAV_STOP)); |
| 76 | } |
| 77 | |
| 78 | @Override |
| 79 | public void onNextTurnChanged(int event, String road, int turnAngle, int turnNumber, |
| 80 | Bitmap image, int turnSide) { |
| 81 | mHandler.sendMessage(mHandler.obtainMessage(MSG_NAV_NEXT_TURN, |
| 82 | new NextTurn(event, road, turnAngle, turnNumber, image, turnSide))); |
| 83 | } |
| 84 | |
| 85 | @Override |
| 86 | public void onNextTurnDistanceChanged(int distanceMeters, int timeSeconds) { |
| 87 | mHandler.sendMessage(mHandler.obtainMessage( |
| 88 | MSG_NAV_NEXT_TURN_DISTANCE, distanceMeters, timeSeconds)); |
| 89 | } |
| 90 | |
| 91 | private static class NavigationRendererHandler extends RendererHandler<NavigationRenderer> { |
| 92 | |
| 93 | NavigationRendererHandler(Looper looper, NavigationRenderer renderer) { |
| 94 | super(looper, renderer); |
| 95 | } |
| 96 | |
| 97 | @Override |
| 98 | public void handleMessage(Message msg, NavigationRenderer renderer) { |
| 99 | |
| 100 | switch (msg.what) { |
| 101 | case MSG_NAV_START: |
| 102 | renderer.onStartNavigation(); |
| 103 | break; |
| 104 | case MSG_NAV_STOP: |
| 105 | renderer.onStopNavigation(); |
| 106 | break; |
| 107 | case MSG_NAV_NEXT_TURN: |
| 108 | NextTurn nt = (NextTurn) msg.obj; |
| 109 | renderer.onNextTurnChanged(nt.event, nt.road, nt.turnAngle, nt.turnNumber, |
| 110 | nt.bitmap, nt.turnSide); |
| 111 | break; |
| 112 | case MSG_NAV_NEXT_TURN_DISTANCE: |
| 113 | renderer.onNextTurnDistanceChanged(msg.arg1, msg.arg2); |
| 114 | break; |
| 115 | default: |
| 116 | throw new IllegalArgumentException("Msg: " + msg.what); |
| 117 | } |
| 118 | } |
| 119 | } |
| 120 | |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 121 | private static <E> E runAndWaitResult(Handler handler, RunnableWithResult<E> runnable) { |
Pavel Maltsev | 0477e29 | 2016-05-27 12:22:36 -0700 | [diff] [blame^] | 122 | final CountDownLatch latch = new CountDownLatch(1); |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 123 | handler.post(() -> { |
| 124 | runnable.run(); |
| 125 | latch.countDown(); |
| 126 | }); |
| 127 | try { |
Pavel Maltsev | 0477e29 | 2016-05-27 12:22:36 -0700 | [diff] [blame^] | 128 | latch.await(); |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 129 | } catch (InterruptedException e) { |
| 130 | throw new RuntimeException(e); |
| 131 | } |
| 132 | return runnable.getResult(); |
| 133 | } |
| 134 | |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 135 | private static class NextTurn { |
| 136 | private final int event; |
| 137 | private final String road; |
| 138 | private final int turnAngle; |
| 139 | private final int turnNumber; |
| 140 | private final Bitmap bitmap; |
| 141 | private final int turnSide; |
| 142 | |
| 143 | NextTurn(int event, String road, int turnAngle, int turnNumber, Bitmap bitmap, |
| 144 | int turnSide) { |
| 145 | this.event = event; |
| 146 | this.road = road; |
| 147 | this.turnAngle = turnAngle; |
| 148 | this.turnNumber = turnNumber; |
| 149 | this.bitmap = bitmap; |
| 150 | this.turnSide = turnSide; |
| 151 | } |
| 152 | } |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 153 | |
Pavel Maltsev | 0477e29 | 2016-05-27 12:22:36 -0700 | [diff] [blame^] | 154 | private static abstract class RunnableWithResult<T> implements Runnable { |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 155 | private volatile T result; |
| 156 | |
| 157 | protected abstract T createResult(); |
| 158 | |
| 159 | @Override |
| 160 | public void run() { |
| 161 | result = createResult(); |
| 162 | } |
| 163 | |
| 164 | public T getResult() { |
| 165 | return result; |
| 166 | } |
| 167 | } |
Pavel Maltsev | 0477e29 | 2016-05-27 12:22:36 -0700 | [diff] [blame^] | 168 | |
| 169 | private static abstract class RendererHandler<T> extends Handler { |
| 170 | |
| 171 | private final WeakReference<T> mRendererRef; |
| 172 | |
| 173 | RendererHandler(Looper looper, T renderer) { |
| 174 | super(looper); |
| 175 | mRendererRef = new WeakReference<>(renderer); |
| 176 | } |
| 177 | |
| 178 | @Override |
| 179 | public void handleMessage(Message msg) { |
| 180 | T renderer = mRendererRef.get(); |
| 181 | if (renderer != null) { |
| 182 | handleMessage(msg, renderer); |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | public abstract void handleMessage(Message msg, T renderer); |
| 187 | } |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 188 | } |