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annotate jvmci/jdk.internal.jvmci.service/src/jdk/internal/jvmci/service/Services.java @ 22569:ec96f33a101d

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updated imports to be explicit and added checkstyle rule to forbid * imports
author Doug Simon <doug.simon@oracle.com>
date Wed, 16 Sep 2015 13:40:05 +0200
parents 0666b6a8f33b
children
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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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0e095e2c24e2 Rename com.oracle.jvmci to jdk.internal.jvmci
twisti
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23 package jdk.internal.jvmci.service;
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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 }