/**
* this is the main method of the servlet that will service all get requests.
*
* @param request HttpServletRequest
* @param responce HttpServletResponce
*/
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
try {
res.setContentType("text/html");
ServletOutputStream out = res.getOutputStream();
hitCount++;
long totalMemory = Runtime.getRuntime().totalMemory();
long maxMemoryBeforeGC = Runtime.getRuntime().maxMemory();
long freeMemoryBeforeGC = Runtime.getRuntime().freeMemory();
long startTime = System.currentTimeMillis();
System.gc(); // Invoke the GC.
long endTime = System.currentTimeMillis();
long maxMemoryAfterGC = Runtime.getRuntime().maxMemory();
long freeMemoryAfterGC = Runtime.getRuntime().freeMemory();
out.println(
"<html><head><title>ExplicitGC</title></head>"
+ "<body><HR><BR><FONT size=\"+2\" color=\"#000066\">Explicit Garbage Collection<BR></FONT><FONT size=\"+1\" color=\"#000066\">Init time : "
+ initTime
+ "<BR><BR></FONT> <B>Hit Count: "
+ hitCount
+ "<br>"
+ "<table border=\"0\"><tr>"
+ "<td align=\"right\">Total Memory</td><td align=\"right\">"
+ totalMemory
+ "</td>"
+ "</tr></table>"
+ "<table width=\"350\"><tr><td colspan=\"2\" align=\"left\">"
+ "Statistics before GC</td></tr>"
+ "<tr><td align=\"right\">"
+ "Max Memory</td><td align=\"right\">"
+ maxMemoryBeforeGC
+ "</td></tr>"
+ "<tr><td align=\"right\">"
+ "Free Memory</td><td align=\"right\">"
+ freeMemoryBeforeGC
+ "</td></tr>"
+ "<tr><td align=\"right\">"
+ "Used Memory</td><td align=\"right\">"
+ (totalMemory - freeMemoryBeforeGC)
+ "</td></tr>"
+ "<tr><td colspan=\"2\" align=\"left\">Statistics after GC</td></tr>"
+ "<tr><td align=\"right\">"
+ "Max Memory</td><td align=\"right\">"
+ maxMemoryAfterGC
+ "</td></tr>"
+ "<tr><td align=\"right\">"
+ "Free Memory</td><td align=\"right\">"
+ freeMemoryAfterGC
+ "</td></tr>"
+ "<tr><td align=\"right\">"
+ "Used Memory</td><td align=\"right\">"
+ (totalMemory - freeMemoryAfterGC)
+ "</td></tr>"
+ "<tr><td align=\"right\">"
+ "Total Time in GC</td><td align=\"right\">"
+ Float.toString((endTime - startTime) / 1000)
+ "s</td></tr>"
+ "</table>"
+ "</body></html>");
} catch (Exception e) {
Log.error(e, "ExplicitGC.doGet(...): general exception caught");
res.sendError(500, e.toString());
}
}
