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; |
Pavel Maltsev | 1fd2ff6 | 2017-07-05 19:09:07 -0700 | [diff] [blame] | 21 | import android.os.Bundle; |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 22 | import android.os.Handler; |
| 23 | import android.os.Looper; |
| 24 | import android.os.Message; |
| 25 | |
Pavel Maltsev | 0477e29 | 2016-05-27 12:22:36 -0700 | [diff] [blame] | 26 | import java.lang.ref.WeakReference; |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 27 | import java.util.concurrent.CountDownLatch; |
| 28 | |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 29 | /** |
| 30 | * A wrapper over {@link NavigationRenderer} that runs all its methods in the context of provided |
| 31 | * looper. It is guaranteed that all calls will be invoked in order they were called. |
| 32 | */ |
Dean Harding | 8099f2f | 2018-02-07 15:00:21 -0800 | [diff] [blame^] | 33 | // TODO(deanh): Does this class even need to exist? |
Pavel Maltsev | 0477e29 | 2016-05-27 12:22:36 -0700 | [diff] [blame] | 34 | /* package */ class ThreadSafeNavigationRenderer extends NavigationRenderer { |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 35 | |
| 36 | private final Handler mHandler; |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 37 | private final NavigationRenderer mRenderer; |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 38 | |
Dean Harding | 8099f2f | 2018-02-07 15:00:21 -0800 | [diff] [blame^] | 39 | private final static int MSG_EVENT = 1; |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 40 | |
| 41 | /** Creates thread-safe {@link NavigationRenderer}. Returns null if renderer == null */ |
| 42 | @Nullable |
Pavel Maltsev | 0477e29 | 2016-05-27 12:22:36 -0700 | [diff] [blame] | 43 | static NavigationRenderer createFor(Looper looper, NavigationRenderer renderer) { |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 44 | return renderer == null ? null : new ThreadSafeNavigationRenderer(looper, renderer); |
| 45 | } |
| 46 | |
| 47 | private ThreadSafeNavigationRenderer(Looper looper, NavigationRenderer renderer) { |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 48 | mRenderer = renderer; |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 49 | mHandler = new NavigationRendererHandler(looper, renderer); |
| 50 | } |
| 51 | |
| 52 | @Override |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 53 | public CarNavigationInstrumentCluster getNavigationProperties() { |
Pavel Maltsev | 0477e29 | 2016-05-27 12:22:36 -0700 | [diff] [blame] | 54 | if (mHandler.getLooper() == Looper.myLooper()) { |
| 55 | return mRenderer.getNavigationProperties(); |
| 56 | } else { |
| 57 | return runAndWaitResult(mHandler, |
| 58 | new RunnableWithResult<CarNavigationInstrumentCluster>() { |
| 59 | @Override |
| 60 | protected CarNavigationInstrumentCluster createResult() { |
| 61 | return mRenderer.getNavigationProperties(); |
| 62 | } |
| 63 | }); |
| 64 | } |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 65 | } |
| 66 | |
| 67 | @Override |
Pavel Maltsev | 1fd2ff6 | 2017-07-05 19:09:07 -0700 | [diff] [blame] | 68 | public void onEvent(int eventType, Bundle bundle) { |
| 69 | mHandler.sendMessage(mHandler.obtainMessage(MSG_EVENT, eventType, 0, bundle)); |
| 70 | } |
| 71 | |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 72 | private static class NavigationRendererHandler extends RendererHandler<NavigationRenderer> { |
| 73 | |
| 74 | NavigationRendererHandler(Looper looper, NavigationRenderer renderer) { |
| 75 | super(looper, renderer); |
| 76 | } |
| 77 | |
| 78 | @Override |
| 79 | public void handleMessage(Message msg, NavigationRenderer renderer) { |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 80 | switch (msg.what) { |
Pavel Maltsev | 1fd2ff6 | 2017-07-05 19:09:07 -0700 | [diff] [blame] | 81 | case MSG_EVENT: |
| 82 | Bundle bundle = (Bundle) msg.obj; |
| 83 | renderer.onEvent(msg.arg1, bundle); |
| 84 | break; |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 85 | default: |
| 86 | throw new IllegalArgumentException("Msg: " + msg.what); |
| 87 | } |
| 88 | } |
| 89 | } |
| 90 | |
Jason Tholstrup | 6ad2b51 | 2016-07-14 14:27:37 -0700 | [diff] [blame] | 91 | private static <E> E runAndWaitResult(Handler handler, final RunnableWithResult<E> runnable) { |
Pavel Maltsev | 0477e29 | 2016-05-27 12:22:36 -0700 | [diff] [blame] | 92 | final CountDownLatch latch = new CountDownLatch(1); |
Jason Tholstrup | 6ad2b51 | 2016-07-14 14:27:37 -0700 | [diff] [blame] | 93 | |
| 94 | Runnable wrappedRunnable = new Runnable() { |
| 95 | @Override |
| 96 | public void run() { |
| 97 | runnable.run(); |
| 98 | latch.countDown(); |
| 99 | } |
| 100 | }; |
| 101 | |
| 102 | handler.post(wrappedRunnable); |
| 103 | |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 104 | try { |
Pavel Maltsev | 0477e29 | 2016-05-27 12:22:36 -0700 | [diff] [blame] | 105 | latch.await(); |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 106 | } catch (InterruptedException e) { |
| 107 | throw new RuntimeException(e); |
| 108 | } |
| 109 | return runnable.getResult(); |
| 110 | } |
| 111 | |
Pavel Maltsev | 0477e29 | 2016-05-27 12:22:36 -0700 | [diff] [blame] | 112 | private static abstract class RunnableWithResult<T> implements Runnable { |
Pavel Maltsev | 8cf8691 | 2016-04-01 18:01:51 -0700 | [diff] [blame] | 113 | private volatile T result; |
| 114 | |
| 115 | protected abstract T createResult(); |
| 116 | |
| 117 | @Override |
| 118 | public void run() { |
| 119 | result = createResult(); |
| 120 | } |
| 121 | |
| 122 | public T getResult() { |
| 123 | return result; |
| 124 | } |
| 125 | } |
Pavel Maltsev | 0477e29 | 2016-05-27 12:22:36 -0700 | [diff] [blame] | 126 | |
| 127 | private static abstract class RendererHandler<T> extends Handler { |
| 128 | |
| 129 | private final WeakReference<T> mRendererRef; |
| 130 | |
| 131 | RendererHandler(Looper looper, T renderer) { |
| 132 | super(looper); |
| 133 | mRendererRef = new WeakReference<>(renderer); |
| 134 | } |
| 135 | |
| 136 | @Override |
| 137 | public void handleMessage(Message msg) { |
| 138 | T renderer = mRendererRef.get(); |
| 139 | if (renderer != null) { |
| 140 | handleMessage(msg, renderer); |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | public abstract void handleMessage(Message msg, T renderer); |
| 145 | } |
Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame] | 146 | } |