EnvironmentFactory.java

package org.jboss.capedwarf.common.env;

import java.util.ServiceLoader;

/**
 * The environment utils.
 *
 * @author <a href="mailto:ales.justin@jboss.org">Ales Justin</a>
 */
public class EnvironmentFactory {
    /**
     * The env
     */
    private static volatile Environment env;

    /**
     * For test purposes only!
     *
     * @param id the user id
     */
    static void setUserId(long id) {
        DefaultEnvironment.setUserId(id);
    }

    /**
     * For test purposes only!
     *
     * @param token the user token
     */
    static void setUserToken(String token) {
        DefaultEnvironment.setUserToken(token);
    }

    /**
     * Get environment.
     *
     * @return the environment
     */
    public static Environment getEnvironment() {
        return getEnvironment(Environment.class.getClassLoader());
    }

    /**
     * Get environment.
     *
     * @param cl the classloader to do the lookup
     * @return the environment
     */
    public static Environment getEnvironment(ClassLoader cl) {
        if (env == null) {
            if (cl == null)
                cl = Environment.class.getClassLoader();

            ServiceLoader<Environment> envs = ServiceLoader.load(Environment.class, cl);
            for (Environment e : envs) {
                try {
                    e.touch(); // test
                    env = e;
                    return env;
                } catch (Throwable ignored) {
                }
            }
            // fall back to gae / simple env
            env = new DefaultEnvironment();
        }
        return env;
    }
}