com.rackspacecloud.blueflood.concurrent.ThreadPoolBuilder Maven / Gradle / Ivy

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/*
 * Copyright 2013 Rackspace
 *
 *    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.rackspacecloud.blueflood.concurrent;

import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class ThreadPoolBuilder {
    private static final Logger log = LoggerFactory.getLogger(ThreadPoolBuilder.class);
    
    private int corePoolSize = 10;
    private int maxPoolSize = 10;
    private BlockingQueue workQueue = new LinkedBlockingQueue();
    private RejectedExecutionHandler rejectedHandler = new ThreadPoolExecutor.CallerRunsPolicy();
    private Thread.UncaughtExceptionHandler exceptionHandler = new Thread.UncaughtExceptionHandler() {
        public void uncaughtException(Thread t, Throwable e) {
            log.error(e.getMessage(), e);
        }
    }; 
    private String name = "Thread";
    
    public ThreadPoolBuilder() {
        
    }
    
    public ThreadPoolBuilder withCorePoolSize(int size) {
        this.corePoolSize = size;
        return this;
    }
    
    public ThreadPoolBuilder withMaxPoolSize(int size) {
        this.maxPoolSize = size;
        return this;
    }
    
    public ThreadPoolBuilder withUnboundedQueue() {
        this.workQueue = new LinkedBlockingQueue();
        return this;
    }
    
    public ThreadPoolBuilder withBoundedQueue(int size) {
        this.workQueue = new ArrayBlockingQueue(size);
        return this;
    }
    
    public ThreadPoolBuilder withRejectedHandler(RejectedExecutionHandler rejectedHandler) {
        this.rejectedHandler = rejectedHandler;
        return this;
    }
    
    public ThreadPoolBuilder withName(String name) {
        // ensure we've got a spot to put the thread id.
        if (name.indexOf("%d") < 0) {
            name = name + "-%d";
        }
        this.name = name;
        return this;
        
    }
    
    public ThreadPoolBuilder withExeptionHandler(Thread.UncaughtExceptionHandler exceptionHandler) {
        this.exceptionHandler = exceptionHandler;
        return this;
    }
    
    public ThreadPoolExecutor build() {
        return new ThreadPoolExecutor(
                corePoolSize,
                maxPoolSize,
                30, TimeUnit.SECONDS, // hard code the timeout.
                workQueue,
                new ThreadFactoryBuilder().setNameFormat(name).setPriority(Thread.NORM_PRIORITY).setUncaughtExceptionHandler(exceptionHandler).build(),
                rejectedHandler);
    }
}