Mercurial > hg > truffle
annotate graal/com.oracle.jvmci.service/src/com/oracle/jvmci/service/Services.java @ 21776:0c60e14e7796
include package-info.java in mx driven Java compilation
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 08 Jun 2015 11:47:32 +0200 |
parents | 55058b8000ea |
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1 /* |
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.oracle.jvmci.service; |
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24 |
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25 import java.util.*; |
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26 |
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27 import sun.reflect.*; |
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28 |
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29 /** |
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30 * An mechanism for loading {@linkplain Service JVMCI services}. |
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31 */ |
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32 public class Services { |
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33 |
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34 /** |
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35 * Determines whether to suppress the {@link NoClassDefFoundError} raised if a service |
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36 * implementation class specified in a {@code <jre>/jvmci/services/*} file is missing. |
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37 */ |
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38 private static final boolean SuppressNoClassDefFoundError = Boolean.getBoolean("jvmci.service.suppressNoClassDefFoundError"); |
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39 |
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40 private static final ClassValue<List<Service>> cache = new ClassValue<List<Service>>() { |
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41 @Override |
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42 protected List<Service> computeValue(Class<?> type) { |
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43 try { |
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44 return Arrays.asList(getServiceImpls(type)); |
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45 } catch (NoClassDefFoundError e) { |
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46 if (SuppressNoClassDefFoundError) { |
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47 return Collections.emptyList(); |
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48 } |
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49 throw e; |
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50 } |
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51 } |
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52 }; |
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53 |
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54 /** |
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55 * Gets an {@link Iterable} of the implementations available for a given JVMCI service. |
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56 * |
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57 * @throws SecurityException if a security manager is present and it denies |
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58 * <tt>{@link RuntimePermission}("jvmciServices")</tt> |
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59 */ |
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60 @SuppressWarnings("unchecked") |
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61 @CallerSensitive |
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62 public static <S extends Service> Iterable<S> load(Class<S> service) { |
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63 SecurityManager sm = System.getSecurityManager(); |
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64 if (sm != null) { |
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65 sm.checkPermission(new RuntimePermission("jvmciServices")); |
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66 } |
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67 try { |
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68 return (Iterable<S>) cache.get(service); |
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69 } catch (UnsatisfiedLinkError e) { |
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70 return Collections.emptyList(); |
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71 } |
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72 } |
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73 |
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74 /** |
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75 * Gets the implementation for a given service for which at most one implementation must be |
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76 * available. |
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77 * |
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78 * @param service the service whose implementation is being requested |
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79 * @param required specifies if an {@link InternalError} should be thrown if no implementation |
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80 * of {@code service} is available |
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81 * @throws SecurityException if a security manager is present and it denies |
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82 * <tt>{@link RuntimePermission}("jvmciServices")</tt> |
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83 */ |
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84 @SuppressWarnings("unchecked") |
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85 @CallerSensitive |
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86 public static <S extends Service> S loadSingle(Class<S> service, boolean required) { |
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87 SecurityManager sm = System.getSecurityManager(); |
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88 if (sm != null) { |
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89 sm.checkPermission(new RuntimePermission("jvmciServices")); |
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90 } |
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91 Iterable<S> impls; |
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92 try { |
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93 impls = (Iterable<S>) cache.get(service); |
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94 } catch (UnsatisfiedLinkError e) { |
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95 impls = Collections.emptyList(); |
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96 } |
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97 |
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98 S singleImpl = null; |
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99 for (S impl : impls) { |
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100 if (singleImpl != null) { |
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101 throw new InternalError(String.format("Multiple %s implementations found: %s, %s", service.getName(), singleImpl.getClass().getName(), impl.getClass().getName())); |
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102 } |
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103 singleImpl = impl; |
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104 } |
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105 if (singleImpl == null && required) { |
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106 String javaHome = System.getProperty("java.home"); |
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107 String vmName = System.getProperty("java.vm.name"); |
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108 Formatter errorMessage = new Formatter(); |
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109 errorMessage.format("The VM does not expose required service %s.%n", service.getName()); |
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110 errorMessage.format("Currently used Java home directory is %s.%n", javaHome); |
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111 errorMessage.format("Currently used VM configuration is: %s", vmName); |
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112 throw new UnsupportedOperationException(errorMessage.toString()); |
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113 } |
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114 return singleImpl; |
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115 } |
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116 |
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117 static { |
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118 Reflection.registerMethodsToFilter(Services.class, "getServiceImpls"); |
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119 Reflection.registerFieldsToFilter(Services.class, "cache"); |
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120 } |
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121 |
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122 private static native <S> S[] getServiceImpls(Class<?> service); |
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123 } |