Java同步代码转异步代码

Java同步代码转异步代码

Kagula

2009-11-18

摘要

Thread Thread Group

概要

利用Java源码，介绍同步代码转异步代码框架的使用，下半部份附框架源代码，阅读本文之前可以参考《Java多线程_编程模型研究》http://blog.csdn.net/lee353086/archive/2008/01/10/2033587.aspx

正文

TestThreads.java源码 用来示范异步调用

import kagula.multithread.MsgManagement; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; public class testThreads { private static Log log = LogFactory.getLog(testThreads.class); static public void main(String args[]) { log.debug("-Test thread.begin!"); try { Object lockMain=new Object(); //用来锁住主线程，可以用来等待branch thread返回运算结果。 MsgManagement mm=new MsgManagement("MsgProc1",lockMain); //MsgManagement的实例化 String sTN =mm.invoke("t_main",new Class[] {String.class},new Object[] {new String("FirstT")}); String sTN2 =mm.invoke("t_main",new Class[] {String.class},new Object[] {new String("SecondT")}); log.debug("sTN="+sTN+" sTN2="+sTN2); if(mm.activeCount()>0) { mm.setMaxPriority(Thread.MAX_PRIORITY); synchronized(lockMain) { lockMain.wait(100); } mm.interrupt(); } log.debug("mm.getResult(sTN) "+mm.getResult(sTN)); log.debug("mm.getResult(sTN2) "+mm.getResult(sTN2)); }catch(Exception ex) { ex.printStackTrace(); } log.debug("-Test thread.end!"); } }

MsgManagement.java Original Thread.java源码 ，是异步框架

package kagula.multithread; import java.util.Collections; import java.util.HashMap; import java.util.Map; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * 线程管理器 * * Requirement: JDK1.6.x or above * * @author Jun Li * */ public class MsgManagement extends ThreadGroup{ protected static Log log = LogFactory.getLog(MsgManagement.class); private int nID=1; //auxiliary thread counter flag private Map mapResults=Collections.synchronizedMap(new HashMap()); //store threads processing result. private Object lockMain; // -----------------below methods using only by main callers.begin----------------- public MsgManagement(String strGroupName,Object pLock) { //Initialization the attributes super(strGroupName); lockMain=pLock; } /** * After send processing request,will be return soon. * @param msg * Message * @param nParam * First Parameter * @param secondParam * Second Parameter * @return */ public synchronized String invoke(String pMethodName,Class pClass[],Object pObject[]) throws Exception { return invoke(pMethodName,pClass,pObject,lockMain); } public synchronized String invoke(String pMethodName,Class pClass[],Object pObject[],Object pLock) throws Exception { String strThreadName=new String("MsgManagement's No."+nID+" thread"); MyThread thread=new MyThread(this,strThreadName); thread.setLockMain(pLock); thread.setMethodName(pMethodName); thread.setClassParams(pClass); thread.setObjParams(pObject); thread.start(); nID++; return strThreadName; } /** * Get result by thread name * @param pThreadName * @return */ public Object getResult(String pThreadName) { return mapResults.get(pThreadName); } // -----------------above methods using only by main callers.end----------------- //-----------------below methods using only by threads.begin----------------- public void setNResult(String pName,Object pObj) { mapResults.put(pName, pObj); } // -----------------above methods using only by threads.begin----------------- }

package kagula.multithread; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * Your object need derived from it to implement asynchronous method! * @author Lijun * */ public abstract class OriginalThread extends Thread{ protected static Log log = LogFactory.getLog(OriginalThread.class); protected String MethodName=new String("default"); protected Object objParams[]; protected Class classParams[]; protected Object lockMain; public OriginalThread(ThreadGroup tg,String name) { super(tg,name); } public void run() { log.debug("["+getName()+"] instance of OriginalThread: Before Invoke the method ["+MethodName+"]"); Method method=null; Object objR=null; try { method=this.getClass().getMethod(MethodName, classParams); }catch(NoSuchMethodException e) { log.error(e.toString()); return; } if(method!=null) { try { objR=method.invoke(this, objParams); }catch(IllegalAccessException e) { log.error(e.toString()); return; }catch(InvocationTargetException e) { log.error(e.toString()); return; }catch(IllegalArgumentException e) { log.error(e); return; } catch(Exception e) { log.error(e); return; } } log.debug("["+getName()+"] instance of OriginalThread: After Invoke the method ["+MethodName+"] return value is ["+objR+"]"); setNResult(objR); //put setNResult before setNFlag,because assure after nFlag==SUCCESS,caller will get proper result! synchronized(lockMain) { lockMain.notifyAll(); } } //---------------------below methods only should be used by MsgManagement--------------------- private void setNResult(Object pObj) { MsgManagement mm=(MsgManagement)this.getThreadGroup(); mm.setNResult(this.getName(), pObj); } public void setMethodName(String pMethodName) { this.MethodName = pMethodName; } public void setObjParams(Object[] objParams) { this.objParams = objParams; } public void setClassParams(Class[] classParams) { this.classParams = classParams; } public void setLockMain(Object pLock) { lockMain=pLock; } }

MyThread.java是，你同步代码存放的地方

package kagula.multithread; import org.apache.commons.logging.LogFactory; public class MyThread extends OriginalThread{ public MyThread(ThreadGroup tg,String name) { super(tg,name); log=LogFactory.getLog(this.getClass()); } public String t_main(String sT) { final long nWaitTime=1*1*5*1000; //H*M*S,once,more than nWaitTime hours String s=null;; try{ log.debug("before sleep "+sT); sleep(nWaitTime); log.debug("after sleep "+sT); s="I will return. "+sT; return s; }catch(InterruptedException e) { log.error("kagula("+getId()+"):"+e.toString()); } return s; } }