// Threaddump_p.java 
// -----------------------
// part of YACY
// (C) by Michael Peter Christen; mc@anomic.de
// first published on http://www.anomic.de
// Frankfurt, Germany, 2004
//
// This File is contributed by Alexander Fieger
//
// $LastChangedDate: 2008-01-22 12:51:43 +0100 (Di, 22 Jan 2008) $
// $LastChangedRevision: 4374 $
// $LastChangedBy: low012 $
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program 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
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// Using this software in any meaning (reading, learning, copying, compiling,
// running) means that you agree that the Author(s) is (are) not responsible
// for cost, loss of data or any harm that may be caused directly or indirectly
// by usage of this softare or this documentation. The usage of this software
// is on your own risk. The installation and usage (starting/running) of this
// software may allow other people or application to access your computer and
// any attached devices and is highly dependent on the configuration of the
// software which must be done by the user of the software; the author(s) is
// (are) also not responsible for proper configuration and usage of the
// software, even if provoked by documentation provided together with
// the software.
//
// Any changes to this file according to the GPL as documented in the file
// gpl.txt aside this file in the shipment you received can be done to the
// lines that follows this copyright notice here, but changes must not be
// done inside the copyright notive above. A re-distribution must contain
// the intact and unchanged copyright notice.
// Contributions and changes to the program code must be marked as such.

// You must compile this file with
// javac -classpath .:../Classes Blacklist_p.java
// if the shell's current path is HTROOT

import de.anomic.data.htmlTools;
import de.anomic.http.httpHeader;
import de.anomic.plasma.plasmaSwitchboard;
import de.anomic.server.serverFileUtils;
import de.anomic.server.serverObjects;
import de.anomic.server.serverSwitch;
import de.anomic.tools.nxTools;
import de.anomic.yacy.yacyVersion;

import java.util.Map;
import java.lang.StringBuffer;
import java.util.Date;
import java.io.File;
import java.io.IOException;

public class Threaddump_p {

	private static serverObjects prop;
	private static plasmaSwitchboard sb;

    public static serverObjects respond(httpHeader header, serverObjects post, serverSwitch<?> env) {

    	prop = new serverObjects();
    	sb = (plasmaSwitchboard) env;
    	StringBuffer buffer = new StringBuffer(1000);
    	
    	if (post != null && post.containsKey("createThreaddump")) {
    	    prop.put("dump", "1");
        	// Thread dump
        	Map<Thread,StackTraceElement[]> stackTraces = Thread.getAllStackTraces();
        	Date dt = new Date();
        	String versionstring = yacyVersion.combined2prettyVersion(sb.getConfig("version","0.1"));
        	
        	buffer.append("************* Start Thread Dump " + dt + " *******************").append("<br />");
            buffer.append("<br /> YaCy Version: " + versionstring + "<br />");
        	buffer.append("Total Memory = " + (Runtime.getRuntime().totalMemory())).append("<br />");
        	buffer.append("Used&nbsp;&nbsp;Memory = " + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory())).append("<br />");
        	buffer.append("Free&nbsp;&nbsp;Memory = " + (Runtime.getRuntime().freeMemory())).append("<br />");
        	buffer.append(" --- --- --- --- <br /><br />");
        	
        	appendStackTraces(sb.getRootPath(), buffer, stackTraces, Thread.State.BLOCKED);
        	appendStackTraces(sb.getRootPath(), buffer, stackTraces, Thread.State.RUNNABLE);
        	appendStackTraces(sb.getRootPath(), buffer, stackTraces, Thread.State.TIMED_WAITING);
        	appendStackTraces(sb.getRootPath(), buffer, stackTraces, Thread.State.WAITING);
        	appendStackTraces(sb.getRootPath(), buffer, stackTraces, Thread.State.NEW);
        	appendStackTraces(sb.getRootPath(), buffer, stackTraces, Thread.State.TERMINATED);
            
        	buffer.append("************* End Thread Dump " + dt + " *******************").append("<br />");       	
        
        	prop.put("dump_content", buffer.toString());
    	} else {
    	    prop.put("dump", "0");
    	}
    	
       	return prop;    // return from serverObjects respond()
    }    
    
    private static void appendStackTraces(File rootPath, StringBuffer buffer, Map<Thread,StackTraceElement[]> stackTraces, Thread.State stateIn) {
        buffer.append("THREADS WITH STATES: " + stateIn.toString()).append("<br />").append("<br />");
        File classPath = new File(rootPath, "source");
        
        for (Thread thread: stackTraces.keySet()) {
            StackTraceElement[] stackTraceElements = stackTraces.get(thread);
            StackTraceElement ste;
            String line;
            if (stateIn.equals(thread.getState())) {
                buffer.append("Thread= " + thread.getName() + " " + (thread.isDaemon()?"daemon":"") + " id=" + thread.getId() + " " + thread.getState().toString()).append("<br />");
                for (int i = 0; i < stackTraceElements.length; i++) {
                    ste = stackTraceElements[i];
                    if (i == 0) {
                        line = getLine(classPath, ste.getClassName(), ste.getLineNumber());
                    } else {
                        line = null;
                    }
                    if ((line != null) && (line.length() > 0)) {
                        buffer.append("at " + htmlTools.encodeUnicode2html(ste.toString(), true)).append(" [").append(line).append("]<br />");
                    } else {
                        buffer.append("at " + htmlTools.encodeUnicode2html(ste.toString(), true)).append("<br />");
                    }
                }
                buffer.append("<br />");
            }
        }
        buffer.append("<br />");
    }
    
    private static String getLine(File sourcePath, String classname, int line) {
        // find class
        String classPath = classname.replace('.', '/') + ".java";
        File file = new File(sourcePath, classPath);
        if (!file.exists()) return "";
        try {
            String lineString = nxTools.line(serverFileUtils.read(file), line);
            if (lineString == null) return "@ERROR";
            return lineString;
        } catch (IOException e) {
            return "@EXCEPTION: " + e.getMessage();
        }
    }
}