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annotate jvmci/jdk.vm.ci.services/src/jdk/vm/ci/services/Services.java @ 23692:93be30973b26

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don't crash if Services is used but -XX:-EnableJVMCI - just return null
author Doug Simon <doug.simon@oracle.com>
date Thu, 16 Jun 2016 18:23:03 +0200
parents f84a5ac3be22
children a8378ff1936d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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.ArrayList;
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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 import java.util.ServiceLoader;
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30
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31 import sun.reflect.Reflection;
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32
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33 /**
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34 * An mechanism for accessing service providers via JVMCI. These providers are loaded via a JVMCI
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35 * class loader that is hidden from application code. Hence the {@link SecurityManager} checks in
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36 * {@link #load(Class)} and {@link #loadSingle(Class, boolean)}.
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37 */
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38 public final class Services {
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39
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40 private Services() {
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41 }
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42
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43 private static boolean jvmciEnabled = true;
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44
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45 private static final ClassValue<List<?>> cache = new ClassValue<List<?>>() {
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46 @Override
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47 protected List<?> computeValue(Class<?> type) {
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48 List<Object> impls = new ArrayList<>();
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49 if (jvmciEnabled) {
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50 try {
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51 for (Object impl : ServiceLoader.load(type, getJVMCIClassLoader())) {
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52 impls.add(impl);
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53 }
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54 } catch (InternalError e) {
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55 if (e.getMessage().equals("JVMCI is not enabled")) {
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56 jvmciEnabled = false;
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57 } else {
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58 throw e;
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59 }
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60 }
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61 }
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62 return impls;
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63 }
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64 };
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65
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66 /**
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67 * Performs any required security checks and dynamic reconfiguration to allow the module of a
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68 * given class to access the classes in the JVMCI module.
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69 *
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70 * Note: This API exists to provide backwards compatibility for JVMCI clients compiled against a
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71 * JDK release earlier than 9.
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72 *
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73 * @param requestor a class requesting access to the JVMCI module for its module
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74 * @throws SecurityException if a security manager is present and it denies
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75 * {@link JVMCIPermission}
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76 */
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77 public static void exportJVMCITo(Class<?> requestor) {
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78 // There are no modules in JVMCI-8.
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79 }
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80
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81 /**
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82 * Gets an {@link Iterable} of the JVMCI providers available for a given service.
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83 *
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84 * @throws SecurityException if a security manager is present and it denies <tt>
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85 * {@link RuntimePermission}("jvmci")</tt>
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86 */
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87 @SuppressWarnings("unchecked")
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88 public static <S> Iterable<S> load(Class<S> service) {
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89 SecurityManager sm = System.getSecurityManager();
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90 if (sm != null) {
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91 sm.checkPermission(new JVMCIPermission());
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92 }
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93 try {
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94 return (Iterable<S>) cache.get(service);
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95 } catch (UnsatisfiedLinkError e) {
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96 return Collections.emptyList();
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97 }
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98 }
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99
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100 /**
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101 * Gets the JVMCI provider for a given service for which at most one provider must be available.
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102 *
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103 * @param service the service whose provider is being requested
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104 * @param required specifies if an {@link InternalError} should be thrown if no provider of
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105 * {@code service} is available
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106 * @throws SecurityException if a security manager is present and it denies <tt>
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107 * {@link RuntimePermission}("jvmci")</tt>
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108 */
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109 @SuppressWarnings({"unchecked"})
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110 public static <S> S loadSingle(Class<S> service, boolean required) {
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111 SecurityManager sm = System.getSecurityManager();
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112 if (sm != null) {
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113 sm.checkPermission(new JVMCIPermission());
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114 }
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115 Iterable<S> providers;
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116 try {
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117 providers = (Iterable<S>) cache.get(service);
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118 } catch (UnsatisfiedLinkError e) {
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119 providers = Collections.emptyList();
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120 }
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121
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122 S singleProvider = null;
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123 for (S provider : providers) {
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124 if (singleProvider != null) {
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125 throw new InternalError(String.format("Multiple %s providers found: %s, %s", service.getName(), singleProvider.getClass().getName(), provider.getClass().getName()));
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126 }
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127 singleProvider = provider;
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128 }
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129 if (singleProvider == null && required) {
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130 String javaHome = System.getProperty("java.home");
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131 String vmName = System.getProperty("java.vm.name");
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132 Formatter errorMessage = new Formatter();
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133 errorMessage.format("The VM does not expose required service %s.%n", service.getName());
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134 errorMessage.format("Currently used Java home directory is %s.%n", javaHome);
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135 errorMessage.format("Currently used VM configuration is: %s", vmName);
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136 throw new UnsupportedOperationException(errorMessage.toString());
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137 }
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138 return singleProvider;
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139 }
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140
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141 static {
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142 Reflection.registerMethodsToFilter(Services.class, "getJVMCIClassLoader");
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143 Reflection.registerFieldsToFilter(Services.class, "cache");
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144 }
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145
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146 /**
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147 * Gets the JVMCI class loader.
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148 *
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149 * @throws InternalError with the {@linkplain Throwable#getMessage() message}
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150 * {@code "JVMCI is not enabled"} iff JVMCI is not enabled
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151 */
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152 private static native ClassLoader getJVMCIClassLoader();
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153 }