1 /*
   2  * Copyright (c) 2013, 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 import jdk.testlibrary.OutputAnalyzer;
  26 import jdk.testlibrary.ProcessTools;
  27 import jdk.testlibrary.Utils;
  28 
  29 import java.util.UUID;
  30 
  31 
  32 /**
  33  * This class will try to find an unused port and run a JdpTestCase using it.
  34  * The unused port is needed for jmxremote.port.
  35  * The problem with busy ports arises when running many automated tests on the same host.
  36  * Note that jdp.port is a multicast port and thus it can be binded by different processes at the same time.
  37  */
  38 public abstract class DynamicLauncher {
  39 
  40     final String jdpName = UUID.randomUUID().toString();
  41     int jmxPort;
  42 
  43     protected void run() throws Exception {
  44         OutputAnalyzer out;
  45         int retries = 1;
  46         boolean tryAgain;
  47 
  48         do {
  49             tryAgain = false;
  50             jmxPort = Utils.getFreePort();
  51             out = runVM();
  52             try {
  53                 out.shouldNotContain("Port already in use");
  54             } catch (RuntimeException e) {
  55                 if (retries < 3) {
  56                     retries++;
  57                     tryAgain = true;
  58                 }
  59             }
  60         } while (tryAgain);
  61     }
  62 
  63     protected OutputAnalyzer runVM() throws Exception {
  64         String[] options = this.options();
  65         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(options);
  66         OutputAnalyzer out = new OutputAnalyzer(pb.start());
  67         System.out.println(out.getStdout());
  68         System.err.println(out.getStderr());
  69         return out;
  70     }
  71 
  72     protected abstract String[] options();
  73 
  74 }