com.lithium.flow.util.LogExecutorService.java Source code

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Here is the source code for com.lithium.flow.util.LogExecutorService.java

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/*
 * Copyright 2015 Lithium Technologies, Inc.
 *
 * 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 com.lithium.flow.util;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicInteger;

import javax.annotation.Nonnull;

import org.slf4j.Logger;

import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.MoreExecutors;

/**
 * @author Matt Ayres
 */
public class LogExecutorService {
    private static final Logger log = Logs.getLogger();

    private final ListeningExecutorService service;
    private final AtomicInteger queued = new AtomicInteger();

    public LogExecutorService() {
        this(-1);
    }

    public LogExecutorService(int threads) {
        this(threads == -1 ? Executors.newCachedThreadPool() : Executors.newFixedThreadPool(threads));
    }

    public LogExecutorService(@Nonnull ExecutorService service) {
        this.service = MoreExecutors.listeningDecorator(checkNotNull(service));
    }

    public void execute(@Nonnull String name, @Nonnull Executable executable) {
        submit(name, executable);
    }

    @Nonnull
    public <T> ListenableFuture<T> submit(@Nonnull String name, @Nonnull Callable<T> callable) {
        checkNotNull(name);
        checkNotNull(callable);

        queued.incrementAndGet();
        ListenableFuture<T> future = service.submit(callable);

        Futures.addCallback(future, new FutureCallback<T>() {
            @Override
            public void onSuccess(T object) {
                queued.decrementAndGet();
                log.debug("execution finished: {}", name);
            }

            @Override
            public void onFailure(@Nonnull Throwable throwable) {
                queued.decrementAndGet();
                log.warn("execution failed: {}", name, throwable);
            }
        });

        return future;
    }

    public void shutdown() {
        service.shutdown();
    }

    public void finish() {
        while (queued.get() > 0) {
            try {
                Thread.sleep(10);
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
            }
        }
        service.shutdown();
    }

    public boolean hasWork() {
        return queued.get() > 0;
    }
}