/* * Copyright (C) 2008 David Kellum * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.gravitext.testservlets; import java.io.IOException; import java.io.PrintWriter; import java.math.BigInteger; import java.util.Random; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Servlet for perform and chunked output testing. * @author David Kellum */ public class PerfTestServlet extends HttpServlet { @Override protected void doGet( HttpServletRequest req, HttpServletResponse resp ) throws ServletException, IOException { int delayConst = getParam( req, "delay", 0 ); int delayRandom = getParam( req, "rdelay", 0 ); int burnConst = getParam( req, "burn", 0 ); int burnRandom = getParam( req, "rburn", 0 ); int size = getParam( req, "size", 0 ); int sizeRandom = getParam( req, "rsize", 0 ); int count = getParam( req, "count", 0 ); count += random( getParam( req, "rcount", 0 ) ); resp.setContentType("text/html; charset=ISO-8859-1" ); PrintWriter out = resp.getWriter(); out.println( "" ); out.println( "" ); out.println( "Wait/Flush Test" ); out.println( "" ); out.println( "" ); out.println( "

Usage

" ); out.println( "" ); out.println( "" ); out.println( "" ); out.println( "" ); out.println( "" ); out.println( "" ); out.println( "" ); out.println( "
GET ParameterMeaning
sizeChunk constant size ~characters.
rsizeChunk random [0,n) size ~characters.
delayConstant chunk delay in ms
rdelayRandom [0,n) chunk delay in ms
burnConstant chunk CPU burn time in ms
rburnRandom [0,n) chunk burn time in ms
" ); out.println( "

Output

" ); out.flush(); out.println( "

Writing " + count + " (delayed) chunks...

" ); out.flush(); try { for( int b = 0; b < count; ++b ) { long delay = delayConst + random( delayRandom ); if( delay > 0 ) Thread.sleep( delay ); int burn = burnConst + random ( burnRandom ); if( burn > 0 ) { delay += burnTime( burn ); } out.println( "

(Delayed " + delay + " ms) " ); int f = size + random( sizeRandom ); while( f > 0 ) { out.print( FILLER ); f -= FILLER.length(); } out.println( "

" ); out.flush(); } } catch( InterruptedException x ) {} out.println( "" ); out.println( "" ); out.flush(); } private long burnTime( int burn_ms ) { long prime = 2; long begin = System.currentTimeMillis(); long endTime = begin + burn_ms; long last = 0; do { prime = BigInteger.probablePrime( 64, new Random() ).longValue(); last = System.currentTimeMillis(); } while( last < endTime ); if( prime == 2 ) { throw new IllegalStateException( "Not a prime!" ); } return last - begin; } private int getParam( HttpServletRequest req, String name, int defVal ) { int value = defVal; String strVal = req.getParameter( name ); if( strVal != null ) { value = Integer.parseInt( strVal ); } return value; } private int random( int range ) { Random _random = new Random(); if( range > 0 ) return _random.nextInt( range ); return 0; } private static final String FILLER = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, " + "sed do eiusmod tempor incididunt ut labore et dolore magna " + "aliqua. Ut enim ad minim veniam, quis nostrud exercitation " + "ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis " + "aute irure dolor in reprehenderit in voluptate velit esse cillum " + "dolore eu fugiat nulla pariatur. Excepteur sint occaecat " + "cupidatat non proident, sunt in culpa qui officia deserunt " + "mollit anim id est laborum. "; private static final long serialVersionUID = 1L; }