1 /** 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 */ 19 package org.apache.mina.api; 20 21 /** 22 * A listener that asynchronously receives the result of a future computation. 23 * The listeners will be called from an event pool and so any amount of 24 * significant work should not be done in this listener. 25 * 26 * @author <a href="http://mina.apache.org">Apache MINA Project</a> 27 */ 28 public interface IoFutureListener<V> { 29 30 /** 31 * Called if there was an exception by the task as it was executing. 32 * Expect {@link java.util.concurrent.CancellationException} of the 33 * future was canceled or {@link java.util.concurrent.ExecutionException} 34 * if there was an error executing the task the future was waiting on. 35 * 36 * @param t an instance of {@link Throwable} 37 */ 38 void exception(Throwable t); 39 40 /** 41 * Called when the task has completed. This method provides the result 42 * returned by the task. 43 * 44 * @param result the result returned by the task. 45 */ 46 void completed(V result); 47 }