LogHelper - ISA actions &_RFC calls tracing

package com.pcf;

import java.io.File;
import java.io.FilenameFilter;
import java.io.RandomAccessFile;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.pcf.isa.core.util.SystemUtils;

/*
  It's quite difficult to 
 follow the struts/layout flow and/or RFC calls from
  the huge config.xml.
  It's easier to track it at run time in the log file to see what happens
  when you take an action on the website.

	However it is difficult to read the SAP log files because the output is huge.

	So i wrote this little utility here, which will tail the sap log file 
	and only print out the relevant Struts actions or RFC logs 
	(one or the other or both, see the booleans)
	It's quick and dirty but very useful. 
 */

/* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 * For this to work with 5.0+ you need to apply SAP note: 975115
 * or see: 
 * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
 */
public class LogHelper implements FilenameFilter
{	
        // sometimes logs endup in this (weird) location (some early 5.0 versions)
        public static final boolean LOGS_ARE_IN_IPC_FOLDER=false;
	// change those as needed
	// possible instance names.
	static String[] SIDS={"ZTB/JC00","ZDA/JC01","ZMS/JC01"};
	static String SID=SIDS[0];
	
	static boolean showRFC=false;
	static boolean showStruts=true;
	// and maybe that one too if on linux, or different instance number etc ...
	static String logFolder=null;
	static String sapRoot=null;

	static Pattern patternStruts=Pattern.compile("\\[actionclass\\]=.*");
	static Pattern patternRFC=Pattern.compile("\\[funcname\\]=.*");

	static
	{
		int sidid=0;
		String root="";
		
		if(SystemUtils.isLinux())
		{
			sapRoot="/usr/sap/";
		}
		else
		{
			sapRoot="C:/usr/sap/";
		}
		
		while( logFolder==null || ! new File(logFolder).exists())
		{
			SID=SIDS[sidid];
                        if(!LOGS_ARE_IN_IPC_FOLDER)
                            logFolder=sapRoot+SID+"/j2ee/cluster/server0/log/";			
                        else
                            // what a stupid folder to put the logs in !!!!
                            logFolder=sapRoot+SID+"/j2ee/cluster/server0/apps/sap.com/crm~ipcpricing/servlet_jsp/ipcpricing/root/WEB-INF/logs/";			
                            
			// if none found it will crap out (out of bound), which is fine.
			sidid++;
		}
		System.out.println("Found Log Folder: "+logFolder);
	}
	
	public void tail() throws Exception
	{
		String lastRecent="";
		String mostRecent="";
		long lastModified=0;
		long length=0;
		
		while (true)
		{
			// finding most recently modified file
			String[] files=new File(logFolder).list(this);
			for(int i=0;i!=files.length;i++)
			{
				long modifDate=new File(logFolder,files[i]).lastModified();
				if(modifDate > lastModified)
				{
					lastModified=modifDate;
					mostRecent=files[i];
				}
			}
			if(!mostRecent.equals(lastRecent))
			{
				System.out.println("\n**Switching to : "+mostRecent+" **\n");	
				lastRecent=mostRecent;
				length=new File(logFolder,mostRecent).length();
			}
			
			File file=new File(logFolder,mostRecent);
			
			String s="";

			// reading the file.
			RandomAccessFile f=new RandomAccessFile(file,"r");
			if(f.length()>length)
			{
			f.seek(length);
			while((s=f.readLine())!=null)
			{
				//matches struts actions
				Matcher matcher=patternStruts.matcher(s);
				if(showStruts && matcher.find())
				{
					s=matcher.group();
					System.out.println(s);
				}
				// matches RFC calls
				matcher=patternRFC.matcher(s);
				if(showRFC && matcher.find())
				{
					s=matcher.group();
					System.out.println(s);
				}
			}
			length=f.length();
			}
			
			f.close();

			Thread.sleep(1000);
		}
		//System.out.println("done");
	}
	
	public boolean accept(File dir, String fileName)
	{
            if(!LOGS_ARE_IN_IPC_FOLDER)
		return fileName.startsWith("defaultTrace");
            else
                return fileName.startsWith("isaruntime");
                
	}
	
	/**
	 * @param args
	 */
	public static void main(String[] args)
	{
		System.out.println("starting");
		LogHelper helper=new LogHelper();
		try
		{
			helper.tail();
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		System.out.println("stopping");
	}

}

**************Start Live input*****************
[actionclass]='com.sap.isa.isacore.action.b2c.order.MaintainBasketB2CDispatcherAction' [path]='/b2c/maintainBasket'#
[actionclass]='com.sap.isa.isacore.action.b2c.order.MaintainBasketB2CDispatcherAction' [path]='/b2c/maintainBasket' [forward]='/b2c/basketcheckout.do' [exectime]='0'#
[actionclass]='com.sap.isa.isacore.action.b2c.order.MaintainBasketB2CCheckoutAction' [path]='/b2c/basketcheckout'#
[actionclass]='com.sap.isa.isacore.action.b2c.order.MaintainBasketB2CCheckoutAction' [path]='/b2c/basketcheckout' [forward]='UIStoreLayout;UIStoreForward:basketorder;UIAction:/b2c/secureLogin.do' [exectime]='1516'#
[actionclass]='com.sap.isa.core.action.StartSecureAction' [path]='/b2c/secureLogin'#
[actionclass]='com.sap.isa.core.action.StartSecureAction' [path]='/b2c/secureLogin' [forward]='UILayout:loginLayout[workarea=login]' [exectime]='16'#