1 /*
   2  * Copyright (c) 2015, 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 package compiler.compilercontrol.share.scenario;
  25 
  26 import compiler.compilercontrol.share.method.MethodDescriptor;
  27 import jdk.test.lib.Utils;
  28 
  29 import java.util.List;
  30 import java.util.Random;
  31 import java.util.stream.Collectors;
  32 import java.util.stream.Stream;
  33 
  34 /**
  35  * Generates random commands
  36  */
  37 public class CommandGenerator {
  38     private static final int MAX_COMMANDS = Integer.getInteger(
  39             "compiler.compilercontrol.share.scenario.CommandGenerator.commands",
  40             100);
  41     private static final Random RANDOM = Utils.getRandomInstance();
  42 
  43     /**
  44      * Generates random command
  45      *
  46      * @return command
  47      */
  48     public Command generateCommand() {
  49         return Utils.getRandomElement(Command.values());
  50     }
  51 
  52     /**
  53      * Generates random number of random command
  54      *
  55      * @return a list of random commands
  56      */
  57     public List<Command> generateCommands() {
  58         int amount = 1 + RANDOM.nextInt(MAX_COMMANDS - 1);
  59         return generateCommands(amount);
  60     }
  61 
  62     /**
  63      * Generates specified amount of random command
  64      *
  65      * @param amount amount of commands to generate
  66      * @return a list of random commands
  67      */
  68     public List<Command> generateCommands(int amount) {
  69         return Stream.generate(this::generateCommand)
  70                 .limit(amount)
  71                 .collect(Collectors.toList());
  72     }
  73 
  74     /**
  75      * Generates random compile command {@link CompileCommand} with specified
  76      * command and method descriptor
  77      *
  78      * @param command a command type
  79      * @param md      a method descriptor
  80      * @param type    a type of the command, or null to generate any
  81      * @return the generated compile command
  82      */
  83     public CompileCommand generateCompileCommand(Command command,
  84             MethodDescriptor md, Scenario.Type type) {
  85         if (type == null) {
  86             type = Utils.getRandomElement(Scenario.Type.values());
  87         }
  88         return type.createCompileCommand(command, md, generateCompiler());
  89     }
  90 
  91     /**
  92      * Generates type of compiler that should be used for the command, or null
  93      * if any or all compilers should be used
  94      *
  95      * @return Compiler value, or null
  96      */
  97     public Scenario.Compiler generateCompiler() {
  98         Scenario.Compiler[] compilers = Scenario.Compiler.values();
  99         int compiler = RANDOM.nextInt(compilers.length + 1) - 1;
 100         return (compiler != -1) ? compilers[compiler] : null;
 101     }
 102 }