package com.vci.server.bof.event;

import com.vci.corba.common.data.VCIInvocationInfo;
import com.vci.server.base.persistence.dao.HibernateSessionFactory;
import com.vci.server.bof.event.IServerEvent;
import com.vci.server.bof.server.ServiceParams;
import com.vci.server.mw.ServerContextVariable;

public class ServerPreEvent implements IServerEvent {
	
	private static ServerPreEvent instance = null;
	
	public static ServerPreEvent getInstance() {
		if(instance == null) {
			instance = new ServerPreEvent();
		}
		return instance;
	}

	@Override
	public void doAction(ServiceParams params) throws Exception {
		String className = ServerContextVariable.getVariablebyKey(PRE_EVENT_KEY);
		if(className != null && className.length() > 0) {
			//取过数据之后把这个变量置为空字符串，避免在后置事件调用服务端方法时，再次触发前后置事件而造成迭代
			VCIInvocationInfo info = HibernateSessionFactory.getVciSessionInfo();
			String[] exAttrs = info.extAttribs;
			for (int i = 0; i < exAttrs.length; ++i) {
				if ((exAttrs[i] != null) && 
						(exAttrs[i].indexOf(PRE_EVENT_KEY + "=") == 0)) {					
					exAttrs[i] = "";
					info.extAttribs = exAttrs;
					break;
				}
			}
			String[] classNames = className.split(EVENT_SEP);
			for(String name : classNames) {				
				Class<?> c = Class.forName(name);
				Object obj = c.newInstance();
				System.out.println("触发前置事件：" + c.getSimpleName() + "!");
				c.getDeclaredMethod("doAction", ServiceParams.class).invoke(obj, params);
			}
		}
	}

}