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package org.glassfish.jersey.server.internal.inject;

import java.io.Closeable;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.glassfish.jersey.process.internal.RequestScoped;
import org.glassfish.jersey.server.CloseableService;
import org.glassfish.jersey.server.internal.LocalizationMessages;

import org.glassfish.hk2.utilities.binding.AbstractBinder;

import com.google.common.collect.Sets;

/**
 * Binder and Factory implementations for {@code CloseableService}.
 *
 * @author Michal Gajdos (michal.gajdos at oracle.com)
 */
public class CloseableServiceBinder extends AbstractBinder {

    /**
     * {@code CloseableService} implementation that stores instances of {@code Closeable} into the properties map obtained from
     * {@code HttpContext}.
     */
    private static class DefaultCloseableService implements CloseableService {

        private final static Logger LOGGER = Logger.getLogger(DefaultCloseableService.class.getName());

        private final AtomicBoolean closed = new AtomicBoolean(false);

        private final Set closeables = Sets.newIdentityHashSet();

        @Override
        public void add(final Closeable closeable) {
            if (!closed.get()) {
                closeables.add(closeable);
            }
        }

        @Override
        public void close() {
            if (closed.compareAndSet(false, true)) {
                for (final Closeable closeable : closeables) {
                    try {
                        closeable.close();
                    } catch (Exception ex) {
                        LOGGER.log(Level.SEVERE,
                                LocalizationMessages.CLOSEABLE_UNABLE_TO_CLOSE(closeable.getClass().getName()), ex);
                    }
                }
            }
        }
    }

    @Override
    protected void configure() {
        bind(DefaultCloseableService.class).to(CloseableService.class).in(RequestScoped.class);
    }
}