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 *
 * The contents of this file are subject to the terms of either the GNU
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
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package org.glassfish.jersey.client;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.logging.Logger;

import org.glassfish.jersey.client.internal.LocalizationMessages;
import org.glassfish.jersey.process.internal.RequestExecutorFactory;
import org.glassfish.jersey.spi.RequestExecutorProvider;

import org.glassfish.hk2.api.ServiceLocator;

import jersey.repackaged.com.google.common.util.concurrent.ThreadFactoryBuilder;

/**
 * {@link org.glassfish.jersey.process.internal.RequestExecutorFactory Executors factory}
 * used on the client side for asynchronous request processing.
 *
 * @author Miroslav Fuksa (miroslav.fuksa at oracle.com)
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
class ClientAsyncExecutorFactory extends RequestExecutorFactory {
    private static final Logger LOGGER = Logger.getLogger(ClientAsyncExecutorFactory.class.getName());

    /**
     * Creates a new instance.
     *
     * @param locator               HK2 service locator.
     * @param defaultThreadPoolSize size of the default executor thread pool (if used).
     *                              Zero or negative values are ignored and a
     *                              {@link java.util.concurrent.Executors#newCachedThreadPool() cached thread pool}
     *                              is created in such case instead.
     */
    public ClientAsyncExecutorFactory(final ServiceLocator locator, final int defaultThreadPoolSize) {
        super(locator, defaultThreadPoolSize);
    }

    @Override
    protected RequestExecutorProvider getDefaultProvider(final Object... initArgs) {

        return new RequestExecutorProvider() {

            @Override
            public ExecutorService getRequestingExecutor() {
                int poolSize = 0;
                if (initArgs != null && initArgs.length > 0 && initArgs[0] instanceof Integer) {
                    poolSize = (Integer)initArgs[0];
                    if (poolSize <= 0) {
                        LOGGER.config(LocalizationMessages.IGNORED_ASYNC_THREADPOOL_SIZE(poolSize));
                    }
                }

                final ThreadFactory threadFactory = new ThreadFactoryBuilder()
                        .setNameFormat("jersey-client-async-executor-%d")
                        .build();

                if (poolSize > 0) {
                    LOGGER.config(LocalizationMessages.USING_FIXED_ASYNC_THREADPOOL(poolSize));
                    return Executors.newFixedThreadPool(poolSize, threadFactory);
                } else {
                    return Executors.newCachedThreadPool(threadFactory);
                }
            }

            @Override
            public void releaseRequestingExecutor(final ExecutorService executor) {
                executor.shutdownNow();
            }
        };
    }
}