io.amient.affinity.core.util.CompletedJavaFuture Maven / Gradle / Ivy

Go to download
/*
 * Copyright 2016-2018 Michal Harish, [email protected]
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 io.amient.affinity.core.util;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.function.Supplier;
import java.util.function.UnaryOperator;

final public class CompletedJavaFuture implements Future {

    private final Supplier resultSupplier;

    public CompletedJavaFuture() {
        this.resultSupplier = () -> null;
    }
    public CompletedJavaFuture(T result) {
        this.resultSupplier = () -> result;
    }

    public CompletedJavaFuture(Supplier resultSupplier) {
        this.resultSupplier = resultSupplier;
    }

    @Override
    public boolean isCancelled() {
        return false;
    }

    public T get() throws ExecutionException, InterruptedException {
        return resultSupplier.get();
    }

    @Override
    public T get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
        return resultSupplier.get();
    }

    @Override
    public boolean cancel(boolean mayInterruptIfRunning) {
        return false;
    }

    @Override
    public boolean isDone() {
        return true;
    }
}