    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017package org.apache.commons.lang3.concurrent;
    018
    019import java.util.Objects;
    020import java.util.concurrent.ExecutionException;
    021import java.util.concurrent.Future;
    022import java.util.concurrent.TimeUnit;
    023import java.util.concurrent.TimeoutException;
    024
    025/**
    026 * Proxies to a {@link Future} for subclassing.
    027 *
    028 * @param <V> The result type returned by this Future's {@link #get()} and {@link #get(long, TimeUnit)} methods.
    029 * @since 3.13.0
    030 */
    031public abstract class AbstractFutureProxy<V> implements Future<V> {
    032
    033    private final Future<V> future;
    034
    035    /**
    036     * Constructs a new instance.
    037     *
    038     * @param future the delegate.
    039     */
    040    public AbstractFutureProxy(final Future<V> future) {
    041        this.future = Objects.requireNonNull(future, "future");
    042    }
    043
    044    @Override
    045    public boolean cancel(final boolean mayInterruptIfRunning) {
    046        return future.cancel(mayInterruptIfRunning);
    047    }
    048
    049    @Override
    050    public V get() throws InterruptedException, ExecutionException {
    051        return future.get();
    052    }
    053
    054    @Override
    055    public V get(final long timeout, final TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
    056        return future.get(timeout, unit);
    057    }
    058
    059    /**
    060     * Gets the delegate.
    061     *
    062     * @return the delegate.
    063     */
    064    public Future<V> getFuture() {
    065        return future;
    066    }
    067
    068    @Override
    069    public boolean isCancelled() {
    070        return future.isCancelled();
    071    }
    072
    073    @Override
    074    public boolean isDone() {
    075        return future.isDone();
    076    }
    077
    078}