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annotate jvmci/jdk.vm.ci.services/src/jdk/vm/ci/services/Services.java @ 24110:a8378ff1936d

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remove use of cache in jdk.vm.ci.services.Services (GR-3293)
author Doug Simon <doug.simon@oracle.com>
date Mon, 20 Mar 2017 10:46:02 +0100
parents 93be30973b26
children c6b5d927e67f
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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.Collections;
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26 import java.util.Formatter;
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27 import java.util.ServiceLoader;
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28
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29 import sun.reflect.Reflection;
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30
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31 /**
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32 * An mechanism for accessing service providers via JVMCI. These providers are loaded via a JVMCI
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33 * class loader that is hidden from application code. Hence the {@link SecurityManager} checks in
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34 * {@link #load(Class)} and {@link #loadSingle(Class, boolean)}.
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35 */
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36 public final class Services {
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37
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38 private Services() {
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39 }
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40
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41 private static boolean jvmciEnabled = true;
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42
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43 private static <S> Iterable<S> load0(Class<S> service) {
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44 if (jvmciEnabled) {
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45 ClassLoader cl = null;
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46 try {
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47 cl = getJVMCIClassLoader();
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48 return ServiceLoader.load(service, cl);
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49 } catch (UnsatisfiedLinkError e) {
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50 jvmciEnabled = false;
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51 } catch (InternalError e) {
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52 if (e.getMessage().equals("JVMCI is not enabled")) {
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53 jvmciEnabled = false;
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54 } else {
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55 throw e;
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56 }
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57 }
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58 }
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59 return Collections.emptyList();
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60 }
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61
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62 /**
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63 * Performs any required security checks and dynamic reconfiguration to allow the module of a
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64 * given class to access the classes in the JVMCI module.
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65 *
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66 * Note: This API exists to provide backwards compatibility for JVMCI clients compiled against a
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67 * JDK release earlier than 9.
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68 *
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69 * @param requestor a class requesting access to the JVMCI module for its module
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70 * @throws SecurityException if a security manager is present and it denies
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71 * {@link JVMCIPermission}
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72 */
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73 public static void exportJVMCITo(Class<?> requestor) {
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74 // There are no modules in JVMCI-8.
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75 }
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76
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77 /**
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78 * Gets an {@link Iterable} of the JVMCI providers available for a given service.
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79 *
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80 * @throws SecurityException if a security manager is present and it denies <tt>
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81 * {@link RuntimePermission}("jvmci")</tt>
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82 */
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83 public static <S> Iterable<S> load(Class<S> service) {
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84 SecurityManager sm = System.getSecurityManager();
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85 if (sm != null) {
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86 sm.checkPermission(new JVMCIPermission());
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87 }
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88 return load0(service);
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89 }
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90
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91 /**
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92 * Gets the JVMCI provider for a given service for which at most one provider must be available.
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93 *
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94 * @param service the service whose provider is being requested
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95 * @param required specifies if an {@link InternalError} should be thrown if no provider of
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96 * {@code service} is available
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97 * @throws SecurityException if a security manager is present and it denies <tt>
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98 * {@link RuntimePermission}("jvmci")</tt>
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99 */
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100 public static <S> S loadSingle(Class<S> service, boolean required) {
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101 SecurityManager sm = System.getSecurityManager();
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102 if (sm != null) {
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103 sm.checkPermission(new JVMCIPermission());
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104 }
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105 Iterable<S> providers = load0(service);
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106
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107 S singleProvider = null;
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108 for (S provider : providers) {
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109 if (singleProvider != null) {
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110 throw new InternalError(String.format("Multiple %s providers found: %s, %s", service.getName(), singleProvider.getClass().getName(), provider.getClass().getName()));
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111 }
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112 singleProvider = provider;
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113 }
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114 if (singleProvider == null && required) {
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115 String javaHome = System.getProperty("java.home");
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116 String vmName = System.getProperty("java.vm.name");
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117 Formatter errorMessage = new Formatter();
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118 errorMessage.format("The VM does not expose required service %s.%n", service.getName());
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119 errorMessage.format("Currently used Java home directory is %s.%n", javaHome);
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120 errorMessage.format("Currently used VM configuration is: %s", vmName);
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121 throw new UnsupportedOperationException(errorMessage.toString());
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122 }
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123 return singleProvider;
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124 }
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125
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126 static {
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127 Reflection.registerMethodsToFilter(Services.class, "getJVMCIClassLoader");
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128 }
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129
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130 /**
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131 * Gets the JVMCI class loader.
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132 *
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133 * @throws InternalError with the {@linkplain Throwable#getMessage() message}
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134 * {@code "JVMCI is not enabled"} iff JVMCI is not enabled
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135 */
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136 private static native ClassLoader getJVMCIClassLoader();
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137 }