PromiseTask.java — netty Source File

Source Code

/*
 * Copyright 2013 The Netty Project
 *
 * The Netty Project 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:
 *
 *   https://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.netty.util.concurrent;

import java.util.concurrent.Callable;
import java.util.concurrent.RunnableFuture;

class PromiseTask<V> extends DefaultPromise<V> implements RunnableFuture<V> {

    private static final class RunnableAdapter<T> implements Callable<T> {
        final Runnable task;
        final T result;

        RunnableAdapter(Runnable task, T result) {
            this.task = task;
            this.result = result;
        }

        @Override
        public T call() {
            task.run();
            return result;
        }

        @Override
        public String toString() {
            return "Callable(task: " + task + ", result: " + result + ')';
        }
    }

    private static final Runnable COMPLETED = new SentinelRunnable("COMPLETED");
    private static final Runnable CANCELLED = new SentinelRunnable("CANCELLED");
    private static final Runnable FAILED = new SentinelRunnable("FAILED");

    private static class SentinelRunnable implements Runnable {
        private final String name;

        SentinelRunnable(String name) {
            this.name = name;
        }

        @Override
        public void run() { } // no-op

        @Override
        public String toString() {
            return name;
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