content: package com.xxl.job.core.glue;
  
  import com.xxl.job.core.glue.impl.SpringGlueFactory;
  import com.xxl.job.core.handler.IJobHandler;
  import groovy.lang.GroovyClassLoader;
  
  import java.math.BigInteger;
  import java.security.MessageDigest;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ConcurrentMap;
  
  /**
   * glue factory, product class/object by name
   *
   * @author xuxueli 2016-1-2 20:02:27
   */
  public class GlueFactory {
  
  
  	private static GlueFactory glueFactory = new GlueFactory();
  	public static GlueFactory getInstance(){
  		return glueFactory;
  	}
  	public static void refreshInstance(int type){
  		if (type == 0) {
  			glueFactory = new GlueFactory();
  		} else if (type == 1) {
  			glueFactory = new SpringGlueFactory();
  		}
  	}
  
  
  	/**
  	 * groovy class loader
  	 */
  	private GroovyClassLoader groovyClassLoader = new GroovyClassLoader();
  	private ConcurrentMap<String, Class<?>> CLASS_CACHE = new ConcurrentHashMap<>();
  
  	/**
  	 * load new instance, prototype
  	 *
  	 * @param codeSource
  	 * @return
  	 * @throws Exception
  	 */
  	public IJobHandler loadNewInstance(String codeSource) throws Exception{
  		if (codeSource!=null && codeSource.trim().length()>0) {
  			Class<?> clazz = getCodeSourceClass(codeSource);
  			if (clazz != null) {
  				Object instance = clazz.newInstance();
  				if (instance!=null) {
  					if (instance instanceof IJobHandler) {
  						this.injectService(instance);
  						return (IJobHandler) instance;
  					} else {
  						throw new IllegalArgumentException(">>>>>>>>>>> xxl-glue, loadNewInstance error, "
  								+ "cannot convert from instance["+ instance.getClass() +"] to IJobHandler");
  					}
  				}
  			}
  		}
  		throw new IllegalArgumentException(">>>>>>>>>>> xxl-glue, loadNewInstance error, instance is null");
  	}
  	private Class<?> getCodeSourceClass(String codeSource){
  		try {
  			// md5
  			byte[] md5 = MessageDigest.getInstance("MD5").digest(codeSource.getBytes());
  			String md5Str = new BigInteger(1, md5).toString(16);
  
  			Class<?> clazz = CLASS_CACHE.get(md5Str);
  			if(clazz == null){
  				clazz = groovyClassLoader.parseClass(codeSource);
  				CLASS_CACHE.putIfAbsent(md5Str, clazz);
  			}
  			return clazz;
  		} catch (Exception e) {
  			return groovyClassLoader.parseClass(codeSource);
  		}
  	}
  
  	/**
  	 * inject service of bean field
  	 *
  	 * @param instance
  	 */
  	public void injectService(Object instance) {
  		// do something
  	}
  
  }
  