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package com.sun.grizzly.threadpool;

import com.sun.grizzly.Grizzly;
import com.sun.grizzly.attributes.AttributeBuilder;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Level;

/**
 * Thread Pool implementation, based on {@link ThreadPoolExecutor}
 *
 * @author Alexey Stashok
 */
public class DefaultThreadPool extends ThreadPoolExecutor
        implements ExtendedThreadPool, Thread.UncaughtExceptionHandler {
    // Min number of worker threads in a pool
    private static int DEFAULT_MIN_THREAD_COUNT = 5;
    
    // Max number of worker threads in a pool
    private static int DEFAULT_MAX_THREAD_COUNT = 20;
    
    // Max number of tasks thread pool can enqueue
    private static int DEFAULT_MAX_TASKS_QUEUED = Integer.MAX_VALUE;
    
    // Timeout, after which idle thread will be stopped and excluded from pool
    private static int DEFAULT_IDLE_THREAD_KEEPALIVE_TIMEOUT = 30000;
    
    /**
     * AttributeBuilder to index WorkerThread attributes
     */
    protected AttributeBuilder attributeBuilder =
            Grizzly.DEFAULT_ATTRIBUTE_BUILDER;
    
    private String name = "Grizzly";
    
    private int maxTasksCount;
    
    private AtomicInteger workerThreadCounter = new AtomicInteger();

    public DefaultThreadPool() {
        this(DEFAULT_MIN_THREAD_COUNT, DEFAULT_MAX_THREAD_COUNT,
                DEFAULT_MAX_TASKS_QUEUED, DEFAULT_IDLE_THREAD_KEEPALIVE_TIMEOUT,
                TimeUnit.MILLISECONDS);
    }
    
    public DefaultThreadPool(int corePoolSize, int maximumPoolSize,
            int maxTasksCount, long keepAliveTime, TimeUnit unit) {
        super(corePoolSize, maximumPoolSize, keepAliveTime, unit, 
                new LinkedBlockingQueue(maxTasksCount));
        setThreadFactory(new DefaultWorkerThreadFactory(this));
        this.maxTasksCount = maxTasksCount;
    }

    public int getQueuedTasksCount() {
        return getQueue().size();
    }

    public int getMaxQueuedTasksCount() {
        return maxTasksCount;
    }

    public void setMaxQueuedTasksCount(int maxTasksCount) {
        throw new UnsupportedOperationException("Value could not be changed!");
    }
    
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getQueueSize() {
        return getQueue().size();
    }

    public void start() {
        this.prestartCoreThread();
    }

    public void stop() {
        shutdownNow();
    }

    public AttributeBuilder getAttributeBuilder() {
        return attributeBuilder;
    }

    public void setAttributeBuilder(AttributeBuilder attributeBuilder) {
        this.attributeBuilder = attributeBuilder;
    }

    public void uncaughtException(Thread thread, Throwable throwable) {
        Grizzly.logger.log(Level.WARNING,
                "Uncaught thread exception. Thread: " + thread, throwable);
    }

    @Override
    protected void beforeExecute(Thread t, Runnable r) {
        ((DefaultWorkerThread) t).onBeforeRun();
    }

    @Override
    protected void afterExecute(Runnable r, Throwable t) {
        ((DefaultWorkerThread) Thread.currentThread()).onAfterRun();
    }

    private static class DefaultWorkerThreadFactory implements ThreadFactory {
        private DefaultThreadPool threadPool;

        public DefaultWorkerThreadFactory(DefaultThreadPool threadPool) {
            this.threadPool = threadPool;
        }

        public Thread newThread(Runnable r) {
            Thread thread = new DefaultWorkerThread(
                    threadPool.getAttributeBuilder(),
                    threadPool.getName() + "-WorkerThread(" + 
                    threadPool.workerThreadCounter.getAndIncrement() + ")", r);
            thread.setUncaughtExceptionHandler(threadPool);

            return thread;
        }
    }
}