| /* |
| * Copyright 2019 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 androidx.camera.core.impl.utils.executor; |
| |
| import androidx.annotation.NonNull; |
| import androidx.camera.core.CameraXThreads; |
| |
| import java.util.concurrent.Executor; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ThreadFactory; |
| |
| /** |
| * A singleton executor used for non-blocking tasks. |
| */ |
| final class HighPriorityExecutor implements Executor { |
| private static volatile Executor sExecutor; |
| |
| private final ExecutorService mHighPriorityService = |
| Executors.newSingleThreadExecutor( |
| new ThreadFactory() { |
| private static final String THREAD_NAME = |
| CameraXThreads.TAG + "camerax_high_priority"; |
| |
| @Override |
| public Thread newThread(Runnable r) { |
| Thread t = new Thread(r); |
| t.setPriority(Thread.MAX_PRIORITY); |
| t.setName(THREAD_NAME); |
| return t; |
| } |
| }); |
| |
| static Executor getInstance() { |
| if (sExecutor != null) { |
| return sExecutor; |
| } |
| synchronized (HighPriorityExecutor.class) { |
| if (sExecutor == null) { |
| sExecutor = new HighPriorityExecutor(); |
| } |
| } |
| |
| return sExecutor; |
| } |
| |
| @Override |
| public void execute(@NonNull Runnable command) { |
| mHighPriorityService.execute(command); |
| } |
| } |