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package com.sun.enterprise.resource.pool.waitqueue;

import com.sun.appserv.connectors.internal.api.PoolingException;
import com.sun.logging.LogDomains;

import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Factory to create appropriate Pool Wait Queue
 *
 * @author Jagadish Ramu
 */
public class PoolWaitQueueFactory {

    private final static Logger _logger = LogDomains.getLogger(PoolWaitQueueFactory.class, LogDomains.RSR_LOGGER);

    public static PoolWaitQueue createPoolWaitQueue(String className) throws PoolingException {
        PoolWaitQueue waitQueue;

        if (className != null) {
            waitQueue = initializeCustomWaitQueueInPrivilegedMode(className);
        } else {
            waitQueue = new DefaultPoolWaitQueue();
            debug("Initializing Default Pool Wait Queue");
        }
        return waitQueue;
    }

    private static PoolWaitQueue initializeCustomWaitQueueInPrivilegedMode(final String className) throws PoolingException {
        Object result = AccessController.doPrivileged(new PrivilegedAction() {
            public Object run() {

                Object result = null;
                try {
                    result = initializeCustomWaitQueue(className);
                } catch (Exception e) {
                    _logger.log(Level.WARNING, "pool.waitqueue.init.failure", className);
                    _logger.log(Level.WARNING, "pool.waitqueue.init.failure.exception", e);
                }
                return result;
            }
        });
        if (result != null) {
            return (PoolWaitQueue) result;
        } else {
            throw new PoolingException("Unable to initalize custom PoolWaitQueue : " + className);
        }
    }

    private static PoolWaitQueue initializeCustomWaitQueue(String className) throws Exception {
        PoolWaitQueue waitQueue;
        Class class1 = Thread.currentThread().getContextClassLoader().loadClass(className);
        waitQueue = (PoolWaitQueue) class1.newInstance();
        if(_logger.isLoggable(Level.FINEST)) {
            _logger.log(Level.FINEST, "Using Pool Wait Queue class : ", className);
        }
        return waitQueue;
    }

    private static void debug(String debugStatement) {
        if(_logger.isLoggable(Level.FINE)) {
            _logger.log(Level.FINE, debugStatement);
        }
    }
}