com.scudata.dm.ZoneLoader Maven / Gradle / Ivy

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SPL(Structured Process Language) A programming language specially for structured data computing.
There is a newer version: 20240823
package com.scudata.dm;

import java.util.ArrayList;

import com.scudata.common.Logger;
import com.scudata.common.MessageManager;
import com.scudata.parallel.UnitClient;
import com.scudata.resources.ParallelMessage;

/**
 * ?ڴ?????????
 * hosts(;j)	ȡ?????ֻ???????j???ڴ????ţ?j??ʡ??
 * hosts(i;j)	???ñ??ֻ???????j???ڴ????ţ?i=0??ʾ???????j???ڴ?????
 * hosts(n,hs;j)	??hs???ҳ?hosts(;j)????ֵΪ1,??,n?Ŀ??÷ֻ????С???ȱʧ??????hosts()Ϊ?յķֻ?????Ӧȱʧִֵ?г?ʼ??(init.dfx)???Ҳ????㹻??ֻ????ؿ?
 * n==0ʱ???ؿ??÷ֻ????????÷ֻ???λ?????null
 * 
 * @author Joancy
 */
public class ZoneLoader {
	private Integer I = null;
	private String J = null;
	
	private int N = 0;
	private Machines hs = null;
	

	// ?Ѿ??ҵ??˼??????Ļ???????Ҫִ??dfx???صĻ??????ܰ????Ѿ??ҵ????????Ļ??????????ظ?ָ??ͬһip?˿ڵĻ???ȷҪ???ǲ?ͬ?Ļ?????
	private transient ArrayList dispatchedNodes = new ArrayList();
	static MessageManager mm = ParallelMessage.get();

	/**
	 * ????һ???ڴ?????????
	 */
	public ZoneLoader() {
	}

	/**
	 * ???ò???
	 * @param i ????????j???ڴ????ţ?i=0??ʾ???????j???ڴ?????
	 * @param j ????????ʡ????null
	 */
	public void setArgs(Integer i, String j) {
		this.I = i;
		this.J = j;
	}

	/**
	 * ???ò???
	 * @param n n==0ʱ???ؿ??÷ֻ????????÷ֻ???λ?????null
	 * @param hs ?ֻ???
	 * @param j  ??????
	 */
	public void setArgs(Integer n, Machines hs, String j) {
		if(n!=null && n>0){
			this.N = n;
		}
		this.hs = hs;
		this.J = j;
	}
	
	/**
	 * ????ָ???ķֻ??ͻ???
	 * @param nodes ?ֻ??ͻ????б?
	 * @throws Exception ???ӳ????׳??쳣
	 */
	public static void connectNodes(ArrayList nodes)
			throws Exception {
		for (int i = 0; i < nodes.size(); i++) {
			UnitClient uc = (UnitClient) nodes.get(i);
			uc.connect();
		}
	}

	/**
	 * ?ص??ֻ??ͻ??˵?????
	 * @param nodes ?ֻ??ͻ????б?
	 */
	public static void closeNodes(ArrayList nodes) {
		for (int i = 0; i < nodes.size(); i++) {
			UnitClient uc = (UnitClient) nodes.get(i);
			uc.close();
		}
	}
	
	/**
	 * ??ָ???ķֻ????????ҳ??????˵Ļ???
	 * @param deadAsNull û???????ķֻ?ʹ??null???????
	 * @return ?ֻ??ͻ????б?
	 * @throws Exception ?г????̳????׳??쳣
	 */
	public ArrayList listLiveClients( boolean deadAsNull) throws Exception {
		ArrayList liveNodes = new ArrayList();
		StringBuffer reason = new StringBuffer();
		for (int i = 0; i < hs.size(); i++) {
			UnitClient uc = new UnitClient(hs.getHost(i), hs.getPort(i));
			if (uc.isAlive(reason)) {
				liveNodes.add(uc);
			}else if( deadAsNull ){
				liveNodes.add(null);
			}
		}
		return liveNodes;
	}
	
	/**
	 * ?ɹ???????zone??Ӧ?ķֻ????У????򷵻?null
	 * @return ?ֻ?????
	 */
	public Object execute() {
		if(hs!=null){
			return getMachines();
		}
		if(I==null){
//			ȡ?????ֻ???????j???ڴ????ţ?j??ʡ??
			return Env.getAreaNo(J);
		}
		Env.setAreaNo( J, I );
		return true;
	}
	
	private Sequence getMachines(){ 
		ArrayList liveNodes = null;
		try {
			Sequence nodes = new Sequence();
//			n=0?????????л?ķֻ?,????ķֻ???nullռλ
			if( N==0 ){
				ArrayList stateNodes = listLiveClients(true);
				for(UnitClient uc:stateNodes){
					String desc = uc==null?null:uc.toString();
					nodes.add( desc );
				}
				return nodes;
			}
			
			liveNodes = listLiveClients( false );
			if (liveNodes.isEmpty()) {
				Logger.debug(new Exception(mm.getMessage("ZoneLoader.noAlives")));
				return null;
			}
			if(liveNodes.size() areaNos = new ArrayList();
			for (int i = 0; i < liveNodes.size(); i++) {
				UnitClient uc = liveNodes.get(i);
				Integer areaNo = uc.getAreaNo(J);
				areaNos.add( areaNo );
			}
			
//				?Ȱ??ڴ???˳?򣬽??Ѿ????ع??ķֻ??ҳ???
			boolean lackZone = false;
			for (int i = 1; i <= N; i++) {
				Integer zone = i;
				int index = areaNos.indexOf( zone );
				if( index==-1 ){
					nodes.add(null);
					Logger.debug("Data zone: "+i+" is not found.");
					lackZone = true;
				}else{
					UnitClient uc = liveNodes.get(index); 
					nodes.add( uc );
					Logger.debug("Found zone: "+i+" on "+uc);
					dispatchedNodes.add(uc);
				}
			}
//				?ٲ????м?????ȱʧ?ķֻ???֮????Ҫ?????沽????ɣ???Ҫ???Ѿ?ʹ?õķֻ??޳?
			if(lackZone){
				for (int i = 1; i <= N; i++) {
					UnitClient uc = (UnitClient)nodes.get(i);
					if(uc==null){
						for(int n=0;n