Mercurial > hg > graal-jvmci-8
annotate jvmci/jdk.vm.ci.services/src/jdk/vm/ci/services/Services.java @ 22761:f2206f5bb62e
removed @ServiceProvider mechanism (GRAAL-1380)
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 30 Dec 2015 17:55:07 +0100 |
parents | jvmci/jdk.vm.ci.service/src/jdk/vm/ci/service/Services.java@1bbd4a7c274b |
children | 4b58c92e939b |
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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 jdk.vm.ci.services; |
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24 |
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25 import java.util.Arrays; |
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26 import java.util.Collections; |
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27 import java.util.Formatter; |
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28 import java.util.List; |
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29 |
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30 import sun.reflect.Reflection; |
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31 |
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32 /** |
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33 * An mechanism for accessing service providers via JVMCI. These providers are loaded via a JVMCI |
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34 * class loader that is hidden from application code. Hence the {@link SecurityManager} checks in |
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35 * {@link #load(Class)} and {@link #loadSingle(Class, boolean)}. |
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36 */ |
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37 public final class Services { |
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38 |
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39 private Services() { |
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40 } |
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41 |
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42 private static final String SUPPRESS_PROPERTY_NAME = "jvmci.service.suppressNoClassDefFoundError"; |
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43 |
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44 /** |
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45 * Determines whether to suppress the {@link NoClassDefFoundError} raised if a service provider |
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46 * class specified in a {@code <jre>/jvmci/services/*} file is missing. |
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47 */ |
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48 private static final boolean SuppressNoClassDefFoundError = Boolean.getBoolean(SUPPRESS_PROPERTY_NAME); |
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49 |
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50 private static final ClassValue<List<?>> cache = new ClassValue<List<?>>() { |
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51 @Override |
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52 protected List<?> computeValue(Class<?> type) { |
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53 try { |
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54 return Arrays.asList(getServiceImpls(type)); |
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55 } catch (NoClassDefFoundError e) { |
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56 if (SuppressNoClassDefFoundError) { |
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57 return Collections.emptyList(); |
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58 } else { |
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59 NoClassDefFoundError newEx = new NoClassDefFoundError(e.getMessage() + " (suppress with -D" + SUPPRESS_PROPERTY_NAME + "=true)"); |
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60 if (e.getCause() != null) { |
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61 newEx.initCause(e.getCause()); |
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62 } |
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63 throw newEx; |
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64 } |
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65 } |
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66 } |
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67 }; |
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68 |
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69 /** |
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70 * Gets an {@link Iterable} of the JVMCI providers available for a given service. |
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71 * |
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72 * @throws SecurityException if a security manager is present and it denies |
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73 * <tt>{@link RuntimePermission}("jvmciServices")</tt> |
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74 */ |
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75 @SuppressWarnings("unchecked") |
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76 public static <S> Iterable<S> load(Class<S> service) { |
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77 SecurityManager sm = System.getSecurityManager(); |
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78 if (sm != null) { |
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79 sm.checkPermission(new RuntimePermission("jvmciServices")); |
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80 } |
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81 try { |
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82 return (Iterable<S>) cache.get(service); |
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83 } catch (UnsatisfiedLinkError e) { |
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84 return Collections.emptyList(); |
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85 } |
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86 } |
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87 |
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88 /** |
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89 * Gets the JVMCI provider for a given service for which at most one provider must be available. |
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90 * |
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91 * @param service the service whose provider is being requested |
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92 * @param required specifies if an {@link InternalError} should be thrown if no provider of |
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93 * {@code service} is available |
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94 * @throws SecurityException if a security manager is present and it denies |
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95 * <tt>{@link RuntimePermission}("jvmciServices")</tt> |
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96 */ |
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97 @SuppressWarnings({"unchecked"}) |
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98 public static <S> S loadSingle(Class<S> service, boolean required) { |
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99 SecurityManager sm = System.getSecurityManager(); |
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100 if (sm != null) { |
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101 sm.checkPermission(new RuntimePermission("jvmciServices")); |
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102 } |
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103 Iterable<S> providers; |
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104 try { |
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105 providers = (Iterable<S>) cache.get(service); |
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106 } catch (UnsatisfiedLinkError e) { |
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107 providers = Collections.emptyList(); |
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108 } |
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109 |
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110 S singleProvider = null; |
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111 for (S provider : providers) { |
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112 if (singleProvider != null) { |
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113 throw new InternalError(String.format("Multiple %s providers found: %s, %s", service.getName(), singleProvider.getClass().getName(), provider.getClass().getName())); |
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114 } |
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115 singleProvider = provider; |
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116 } |
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117 if (singleProvider == null && required) { |
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118 String javaHome = System.getProperty("java.home"); |
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119 String vmName = System.getProperty("java.vm.name"); |
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120 Formatter errorMessage = new Formatter(); |
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121 errorMessage.format("The VM does not expose required service %s.%n", service.getName()); |
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122 errorMessage.format("Currently used Java home directory is %s.%n", javaHome); |
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123 errorMessage.format("Currently used VM configuration is: %s", vmName); |
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124 throw new UnsupportedOperationException(errorMessage.toString()); |
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125 } |
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126 return singleProvider; |
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127 } |
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128 |
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129 static { |
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130 Reflection.registerMethodsToFilter(Services.class, "getServiceImpls"); |
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131 Reflection.registerFieldsToFilter(Services.class, "cache"); |
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132 } |
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133 |
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134 private static native <S> S[] getServiceImpls(Class<?> service); |
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135 } |