| /* |
| * Copyright (C) 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 com.android.car.connecteddevice.util; |
| |
| import androidx.annotation.NonNull; |
| |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.Executor; |
| import java.util.function.Consumer; |
| |
| /** |
| * Class for invoking thread-safe callbacks. |
| * |
| * @param <T> Callback type. |
| */ |
| public class ThreadSafeCallbacks<T> { |
| |
| private final ConcurrentHashMap<T, Executor> mCallbacks = new ConcurrentHashMap<>(); |
| |
| /** Add a callback to be notified on its executor. */ |
| public void add(@NonNull T callback, @NonNull Executor executor) { |
| mCallbacks.put(callback, executor); |
| } |
| |
| /** Remove a callback from the collection. */ |
| public void remove(@NonNull T callback) { |
| mCallbacks.remove(callback); |
| } |
| |
| /** Clear all callbacks from the collection. */ |
| public void clear() { |
| mCallbacks.clear(); |
| } |
| |
| /** Return the number of callbacks in collection. */ |
| public int size() { |
| return mCallbacks.size(); |
| } |
| |
| /** Invoke notification on all callbacks with their supplied {@link Executor}. */ |
| public void invoke(Consumer<T> notification) { |
| mCallbacks.forEach((callback, executor) -> |
| executor.execute(() -> notification.accept(callback))); |
| } |
| } |