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/*
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 * and Distribution License("CDDL") (collectively, the "License").  You
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 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
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package org.glassfish.jersey.process.internal;

import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.logging.Logger;

import org.glassfish.jersey.internal.inject.Providers;
import org.glassfish.jersey.spi.ProcessingExecutorsProvider;

import org.glassfish.hk2.Services;
import org.glassfish.hk2.scopes.Singleton;

import org.jvnet.hk2.annotations.Inject;
import org.jvnet.hk2.annotations.Scoped;

import com.google.common.util.concurrent.MoreExecutors;

/**
 * Aggregate {@link ProcessingExecutorsProvider processing executors provider}
 * used directly in the {@link RequestInvoker request invoker} to get the pluggable
 * processing executor services.
 *
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
@Scoped(Singleton.class)
public class ProcessingExecutorsFactory implements ProcessingExecutorsProvider {

    private static final Logger LOGGER = Logger.getLogger(ProcessingExecutorsFactory.class.getName());
    //
    private final ExecutorService requestingExecutor;
    private final ExecutorService respondingExecutor;

    ProcessingExecutorsFactory(@Inject Services services) {
        final Set providers = Providers.getProviders(services, ProcessingExecutorsProvider.class);
        requestingExecutor = createRequestingExecutor(providers);
        respondingExecutor = createRespondingExecutor(providers);
    }

    private static ExecutorService createRequestingExecutor(final Set providers) {
        for (ProcessingExecutorsProvider provider : providers) {
            ExecutorService es = provider.getRequestingExecutor();
            if (es != null) {
                LOGGER.config(String.format("Using custom requesting executor [%s] provided by [%s].",
                        es.getClass().getName(), provider.getClass().getName()));
                return es;
            }
        }

        LOGGER.config("Using default requesting executor.");
        return MoreExecutors.sameThreadExecutor();
    }

    private static ExecutorService createRespondingExecutor(final Set providers) {
        for (ProcessingExecutorsProvider provider : providers) {
            ExecutorService es = provider.getRespondingExecutor();
            if (es != null) {
                LOGGER.config(String.format("Using custom responding executor [%s] provided by [%s].",
                        es.getClass().getName(), provider.getClass().getName()));
                return es;
            }
        }

        LOGGER.config("Using default responding executor.");
        return MoreExecutors.sameThreadExecutor();
    }

    // ProcessingExecutorsProvider
    @Override
    public ExecutorService getRequestingExecutor() {
        return requestingExecutor;
    }

    @Override
    public ExecutorService getRespondingExecutor() {
        return respondingExecutor;
    }
}