1 /*
   2  * Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /**
  25  * @test
  26  * @bug 8035668
  27  * @library /lib/testlibrary
  28  * @library /test/lib
  29  * @summary Test checks case when target application finishes execution and jstat didn't complete work.
  30             jstat is started with interval = 100 (jstat -compiler 100) and monitored application finishes
  31             after 500ms. This shouldn't cause crash or hang in target application or in jstat.
  32  * @modules java.management
  33  * @build jdk.testlibrary.* JStatInterval
  34  * @run main JStatInterval
  35  */
  36 
  37 import jdk.test.lib.process.ProcessTools;
  38 import jdk.testlibrary.JDKToolLauncher;
  39 
  40 import java.util.concurrent.TimeUnit;
  41 import java.util.concurrent.atomic.AtomicBoolean;
  42 
  43 public class JStatInterval {
  44     private static final String READY = "READY";
  45     private static final String ERROR = "!ERROR";
  46 
  47     public static class Application {
  48         public static void main(String[] args) {
  49             try {
  50                 System.out.println(READY);
  51                 System.out.flush();
  52                 int exitCode = System.in.read();
  53                 Thread.sleep(500);
  54                 System.exit(exitCode);
  55             } catch (Exception e) {
  56                 System.out.println(ERROR);
  57                 System.out.flush();
  58                 throw new Error(e);
  59             }
  60         }
  61     }
  62     public static void main(String[] args) throws Exception {
  63         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  64             "-cp",
  65             System.getProperty("test.class.path"),
  66             "-XX:+UsePerfData",
  67             Application.class.getName()
  68         );
  69         AtomicBoolean error = new AtomicBoolean(false);
  70         Process app = ProcessTools.startProcess(
  71             "application",
  72             pb,
  73             line -> {
  74                 if (line.equals(READY)) {
  75                     return true;
  76                 } else if (line.equals(ERROR)) {
  77                     error.set(true);
  78                     return true;
  79                 }
  80                 return false;
  81             },
  82             10,
  83             TimeUnit.SECONDS
  84         );
  85         if (error.get()) {
  86             throw new Error("Unable to start the monitored application.");
  87         }
  88 
  89         String pidStr = String.valueOf(app.pid());
  90         JDKToolLauncher l = JDKToolLauncher.createUsingTestJDK("jstat");
  91         l.addToolArg("-compiler");
  92         l.addToolArg(pidStr);
  93         l.addToolArg("100");
  94 
  95         ProcessBuilder jstatDef = new ProcessBuilder(l.getCommand());
  96         Process jstat = ProcessTools.startProcess(
  97             "jstat",
  98             jstatDef,
  99             line -> {
 100                 if (line.trim().toLowerCase().startsWith("compiled")) {
 101                     return true;
 102                 }
 103                 return false;
 104             },
 105             10,
 106             TimeUnit.SECONDS
 107         );
 108 
 109         app.getOutputStream().write(0);
 110         app.getOutputStream().flush();
 111 
 112         if (app.waitFor() != 0) {
 113             throw new Error("Error detected upon exiting the monitored application with active jstat");
 114         }
 115         if (jstat.waitFor() != 0) {
 116             throw new Error("Error detected in jstat when monitored application has exited prematurely");
 117         }
 118     }
 119 }