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package org.quartz.commonj;

import commonj.work.Work;
import commonj.work.WorkManager;
import org.quartz.spi.ThreadExecutor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.naming.InitialContext;
import javax.naming.NamingException;

/**
 * CommonJ WorkManager implementation of hacked Quartz ThreadExecutor class.
 * This class schedules work on a WorkManager which is looked up in JNDI. The
 * advantage is that all the work performed is done on a managed thread which is
 * required by WebSphere, see QUARTZ-743 for
 * details.
 *
 * @author matt.accola
 * @version $Revision$ $Date$
 */
public class WorkManagerThreadExecutor implements ThreadExecutor {
    private final Logger log = LoggerFactory.getLogger(getClass());

    private String workManagerName;
    private WorkManager workManager;

    public void execute(Thread thread) {
        Work work = new org.quartz.commonj.DelegatingWork(thread);
        try {
            this.workManager.schedule(work);
        } catch (Exception e) {
            log.error("Error attempting to schedule QuartzSchedulerThread: " + e.getMessage(), e);
        }
    }

    public void initialize() {
        try {
            this.workManager = (WorkManager) new InitialContext().lookup(workManagerName);
        } catch (NamingException e) {
            throw new IllegalStateException("Could not locate WorkManager: " + e.getMessage(), e);
        }
    }

    /**
     * Sets the JNDI name of the work manager to use.
     *
     * @param workManagerName the JNDI name to use to lookup the work manager
     */
    public void setWorkManagerName(String workManagerName) {
        this.workManagerName = workManagerName;
    }

}

class DelegatingWork implements Work {

    private final Runnable delegate;

    /**
     * Create a new DelegatingWork.
     *
     * @param delegate the Runnable implementation to delegate to
     */
    public DelegatingWork(Runnable delegate) {
        this.delegate = delegate;
    }

    /**
     * @return the wrapped Runnable implementation.
     */
    public final Runnable getDelegate() {
        return this.delegate;
    }

    /**
     * Delegates execution to the underlying Runnable.
     */
    public void run() {
        this.delegate.run();
    }

    public boolean isDaemon() {
        return false;
    }

    /**
     * This implementation is empty, since we expect the Runnable to terminate
     * based on some specific shutdown signal.
     */
    public void release() {
    }

}