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package nabble.view.web.tools;

import com.yourkit.api.Controller;
import com.yourkit.api.ProfilingModes;
import fschmidt.util.java.HtmlUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;


public final class Profile extends HttpServlet {

	private static final Logger logger = LoggerFactory.getLogger(Profile.class);

	private static Controller profiler;
	static {
		try {
			profiler = new com.yourkit.api.Controller();
		} catch (Exception e) {
			logger.info("Profiler error: " + e);
		}
	}

	protected void service(HttpServletRequest request,HttpServletResponse response)
		throws ServletException, IOException
	{
		PrintWriter out = response.getWriter();

		float oneMega = 1024f * 1024f;
		float free = Runtime.getRuntime().freeMemory() / oneMega;
		float total = Runtime.getRuntime().totalMemory() / oneMega;
		float used = total - free;

		String action = request.getParameter("action");
		if ("gc".equals(action)) {
			System.gc();
			response.sendRedirect("/tools/Profile.jtp");
			return;
		} else if ("memory".equals(action)) {
			String file;
			try {
				file = profiler.captureSnapshot(ProfilingModes.SNAPSHOT_WITH_HEAP);
			} catch(Exception e) {
				throw new RuntimeException(e);
			}
			response.sendRedirect("/tools/Profile.jtp?file="+HtmlUtils.urlEncode(file));
			return;
		} else if ("cpu".equals(action)) {
			long seconds = Long.valueOf( request.getParameter("seconds") );
			String file;
			try {
				profiler.startCPUProfiling(ProfilingModes.CPU_SAMPLING, null);
				Thread.sleep(seconds*1000L);
				profiler.stopCPUProfiling();
				file = profiler.captureSnapshot(ProfilingModes.SNAPSHOT_WITHOUT_HEAP);
			} catch(Exception e) {
				throw new RuntimeException(e);
			}
			response.sendRedirect("/tools/Profile.jtp?file="+HtmlUtils.urlEncode(file));
			return;
		}

		out.print( "\n<html>\n	<head>\n		<title>Profiler</title>\n		<style type=\"text/css\">\n			body {\n				font-family:Verdana, Arial, Serif;\n				font-size:.74em;\n			}\n			.gray {\n				background-color: #eeeeee;\n				padding: .5em;\n				margin: .5em;\n				font-size:100%;\n			}\n		</style>\n	</head>\n	<body>\n		<div>\n			<a href=\"/tools/\">Tools</a>\n		</div>\n		" );

				String file = request.getParameter("file");
				if( file != null ) {

		out.print( "\n<div style=\"margin:1em .5em .5em;padding:.3em\">\n	<b>Snapshot File</b>: " );
		out.print( (file) );
		out.print( "\n</div>\n" );

				}

		out.print( "\n<table class=\"gray\">\n	<tr>\n		<td class=\"row-label\">Free Memory</td>\n		<td>\n			" );
		out.print( (String.format("%.2f",free)) );
		out.print( " Mb\n		</td>\n	</tr>\n	<tr>\n		<td class=\"row-label\">Used Memory</td>\n		<td>" );
		out.print( (String.format("%.2f",used)) );
		out.print( " Mb</td>\n	</tr>\n	<tr>\n		<td class=\"row-label\">Total Memory</td>\n		<td>" );
		out.print( (String.format("%.2f",total)) );
		out.print( " Mb</td>\n	</tr>\n</table>\n<input type=\"button\" onclick=\"location='/tools/Profile.jtp?action=gc'\" value=\"Run GC\"/>\n" );
 if (profiler == null) {
		out.print( "\n	<div style=\"margin:1em 0\">\n		Yourkit profiler is disabled on this server.\n	</div>\n" );
 } else {
		out.print( "\n	<div style=\"margin:1em 0\">\n		<input type=\"button\" onclick=\"location='/tools/Profile.jtp?action=memory'\" value=\"Capture Memory Snapshot\"/>\n	</div>\n	<div style=\"margin:1em 0\">\n		<form>\n			<input type=\"hidden\" name=\"action\" value=\"cpu\">\n			<input type=\"text\" name=\"seconds\" value=\"5\" size=\"2\"> seconds\n			<input type=\"submit\" value=\"CPU Profiling\">\n		</form>\n	</div>\n" );
 }
		out.print( "\n</body>\n</html>\n" );

	}

}
author	Franklin Schmidt <fschmidt@gmail.com>
date	Thu, 21 Mar 2019 19:15:52 -0600
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