Java tutorial
/** * Copyright 2016-2018 The Thingsboard Authors * * 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 org.thingsboard.rule.engine.api.util; import com.google.common.util.concurrent.FutureCallback; import com.google.common.util.concurrent.Futures; import com.google.common.util.concurrent.ListenableFuture; import javax.annotation.Nullable; import java.util.concurrent.Executor; import java.util.function.Consumer; public class DonAsynchron { public static <T> void withCallback(ListenableFuture<T> future, Consumer<T> onSuccess, Consumer<Throwable> onFailure) { withCallback(future, onSuccess, onFailure, null); } public static <T> void withCallback(ListenableFuture<T> future, Consumer<T> onSuccess, Consumer<Throwable> onFailure, Executor executor) { FutureCallback<T> callback = new FutureCallback<T>() { @Override public void onSuccess(@Nullable T result) { try { onSuccess.accept(result); } catch (Throwable th) { onFailure(th); } } @Override public void onFailure(Throwable t) { onFailure.accept(t); } }; if (executor != null) { Futures.addCallback(future, callback, executor); } else { Futures.addCallback(future, callback); } } }