Westty.java

/**
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.deephacks.westty;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class Westty {
    private static final String WESTTY_CORE = "org.deephacks.westty.internal.core.WesttyCore";
    private static Object WESTTY;
    private String serverName;
    public static void main(String[] args) throws Throwable {
        Westty westty = new Westty();
        westty.startup();
    }
    public Westty() {
        if (WESTTY == null) {
            ClassLoader cl = Thread.currentThread().getContextClassLoader();
            try {
                WESTTY = cl.loadClass(WESTTY_CORE).newInstance();
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }

    public Westty(String serverName){
        this();
        this.serverName = serverName;
    }

    public synchronized void startup() throws Throwable {
        if(serverName != null){
            call("setServerName", serverName);
        }
        call("startup");
    }

    public synchronized void shutdown() throws Throwable {
        call("shutdown");
    }

    public synchronized <V> V getInstance(Class<V> cls) throws Throwable {
        return (V) call("getInstance", cls);
    }

    public synchronized void stop() throws Throwable {
        call("shutdown");
    }

    private Object call(String method, Object... args) throws Throwable {
        try {
            Class<?> cls = WESTTY.getClass();
            if (args == null || args.length == 0) {
                return cls.getMethod(method).invoke(WESTTY);
            } else {
                Class<?>[] classes = new Class<?>[args.length];
                for (int i = 0; i < args.length; i++) {
                    classes[i] = args[i].getClass();
                }
                Method m = cls.getMethod(method, classes);
                return m.invoke(WESTTY, args);
            }
        } catch (InvocationTargetException e) {
            Throwable t = e.getTargetException();
            if (t instanceof ExceptionInInitializerError) {
                ExceptionInInitializerError err = (ExceptionInInitializerError) t;
                throw err.getCause();
            }
            throw t;

        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}