DumpParserFactory.java

/*
 * DumpParserFactory.java
 *
 * This file is part of TDA - Thread Dump Analysis Tool.
 *
 * TDA is free software; you can redistribute it and/or modify
 * it under the terms of the Lesser GNU General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * TDA is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * Lesser GNU General Public License for more details.
 *
 * You should have received a copy of the Lesser GNU General Public License
 * along with TDA; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * $Id: DumpParserFactory.java,v 1.11 2008-02-14 14:36:08 irockel Exp $
 */

package com.pironet.tda.parser;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Map;

import com.pironet.tda.parser.impl.BeaJDKParser;
import com.pironet.tda.parser.impl.SunJDKParser;
import com.pironet.tda.parser.impl.WrappedSunJDKParser;
import com.pironet.tda.utils.DateMatcher;
import com.pironet.tda.utils.PrefManager;

import fr.loicmathieu.bobbin.parser.impl.AppdynamicsParser;

/**
 * Factory for the dump parsers.
 *
 * @author irockel
 * @author lmathieu
 */
public class DumpParserFactory {
	private static DumpParserFactory instance = null;

	/**
	 * singleton private constructor
	 */
	private DumpParserFactory() {
	}

	/**
	 * get the singleton instance of the factory
	 * @return singleton instance
	 */
	public static DumpParserFactory get() {
		if(instance == null) {
			instance = new DumpParserFactory();
		}

		return(instance);
	}

	/**
	 * parses the given logfile for thread dumps and return a proper jdk parser (either for Sun VM's or
	 * for JRockit/Bea VM's) and initializes the DumpParser with the stream.
	 * @param dumpFileStream the file stream to use for dump parsing.
	 * @param threadStore the map to store the found thread dumps.
	 * @param withCurrentTimeStamp only used by SunJDKParser for running in JConsole-Plugin-Mode,  it then uses
	 *                             the current time stamp instead of a parsed one.
	 * @return a proper dump parser for the given log file, null if no proper parser was found.
	 */
	public DumpParser getDumpParserForLogfile(InputStream dumpFileStream, Map<String, Map<String, String>> threadStore, boolean withCurrentTimeStamp, int startCounter) {
		BufferedReader bis = null;
		int readAheadLimit = PrefManager.get().getStreamResetBuffer();
		int lineCounter = 0;
		DumpParser currentDumpParser = null;

		try {
			bis = new BufferedReader(new InputStreamReader(dumpFileStream));

			// reset current dump parser
			DateMatcher dm = new DateMatcher();
			while (bis.ready() && (currentDumpParser == null)) {
				bis.mark(readAheadLimit);
				String line = bis.readLine();
				dm.checkForDateMatch(line);
				if (WrappedSunJDKParser.checkForSupportedThreadDump(line)) {
					currentDumpParser = new WrappedSunJDKParser(bis, threadStore, lineCounter, withCurrentTimeStamp, startCounter, dm);
				} else if(SunJDKParser.checkForSupportedThreadDump(line)) {
					currentDumpParser = new SunJDKParser(bis, threadStore, lineCounter, withCurrentTimeStamp, startCounter, dm);
				} else if(BeaJDKParser.checkForSupportedThreadDump(line)) {
					currentDumpParser = new BeaJDKParser(bis, threadStore, lineCounter, dm);
				}
				else if(AppdynamicsParser.checkForSupportedThreadDump(line)){//LMA appdynamics parser
					currentDumpParser = new AppdynamicsParser(bis, threadStore, lineCounter, withCurrentTimeStamp, startCounter, dm);
				}
				lineCounter++;
			}
			//System.out.println("Selected Dump Parser: " + currentDumpParser.getClass().getName());
			if ((currentDumpParser != null) && (bis != null)) {
				bis.reset();
			}
		} catch (IOException ex) {
			ex.printStackTrace();
		}
		return currentDumpParser;
	}
}