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 hoursString 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;}}