1 /* 2 * Copyright (C) 2015 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 17 package com.android.camera.async; 18 19 import com.android.camera.util.Callback; 20 21 import java.util.concurrent.Executor; 22 23 import javax.annotation.ParametersAreNonnullByDefault; 24 import javax.annotation.concurrent.ThreadSafe; 25 26 /** 27 * Wraps a not-necessarily-thread-safe callback into a thread-safe callback 28 * which runs it on an executor. 29 */ 30 @ThreadSafe 31 @ParametersAreNonnullByDefault 32 public class ExecutorCallback<T> implements Updatable<T> { 33 private final Callback<T> mCallback; 34 private final Executor mExecutor; 35 36 /** 37 * @param callback The callback to wrap. 38 * @param executor The executor on which to invoke the callback. 39 */ ExecutorCallback(Callback<T> callback, Executor executor)40 public ExecutorCallback(Callback<T> callback, Executor executor) { 41 mCallback = callback; 42 mExecutor = executor; 43 } 44 45 @Override update(final T t)46 public void update(final T t) { 47 mExecutor.execute(new Runnable() { 48 @Override 49 public void run() { 50 mCallback.onCallback(t); 51 } 52 }); 53 } 54 } 55