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annotate jvmci/com.oracle.jvmci.service/src/com/oracle/jvmci/service/Services.java @ 21916:3df76a0300f3

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jvmci.make remove generated source from search path; export compilers into a different directory when jvmci is disabled: jre/lib/<arch>/(server|client)-nojvmci/
author Stefan Anzinger <stefan.anzinger@oracle.com>
date Thu, 11 Jun 2015 11:07:28 +0200
parents 763db13bd6f4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 accessing {@link Service JVMCI service providers}.
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31 */
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32 public class Services {
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33
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34 private static final String SUPPRESS_PROPERTY_NAME = "jvmci.service.suppressNoClassDefFoundError";
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35
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36 /**
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37 * Determines whether to suppress the {@link NoClassDefFoundError} raised if a service provider
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38 * class specified in a {@code <jre>/jvmci/services/*} file is missing.
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39 */
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40 private static final boolean SuppressNoClassDefFoundError = Boolean.getBoolean(SUPPRESS_PROPERTY_NAME);
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41
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42 private static final ClassValue<List<?>> cache = new ClassValue<List<?>>() {
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43 @Override
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44 protected List<?> computeValue(Class<?> type) {
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45 try {
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46 return Arrays.asList(getServiceImpls(type));
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47 } catch (NoClassDefFoundError e) {
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48 if (SuppressNoClassDefFoundError) {
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49 return Collections.emptyList();
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50 } else {
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51 NoClassDefFoundError newEx = new NoClassDefFoundError(e.getMessage() + " (suppress with -D" + SUPPRESS_PROPERTY_NAME + "=true)");
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52 if (e.getCause() != null) {
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53 newEx.initCause(e.getCause());
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54 }
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55 throw newEx;
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56 }
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57 }
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58 }
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59 };
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60
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61 /**
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62 * Gets an {@link Iterable} of the JVMCI providers available for a given service.
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63 *
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64 * @throws SecurityException if a security manager is present and it denies
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65 * <tt>{@link RuntimePermission}("jvmciServices")</tt>
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66 */
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67 @SuppressWarnings("unchecked")
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68 @CallerSensitive
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69 public static <S> Iterable<S> load(Class<S> service) {
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70 SecurityManager sm = System.getSecurityManager();
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71 if (sm != null) {
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72 sm.checkPermission(new RuntimePermission("jvmciServices"));
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73 }
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74 try {
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75 return (Iterable<S>) cache.get(service);
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76 } catch (UnsatisfiedLinkError e) {
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77 return Collections.emptyList();
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78 }
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79 }
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80
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81 /**
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82 * Gets the JVMCI provider for a given service for which at most one provider must be available.
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83 *
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84 * @param service the service whose provider is being requested
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85 * @param required specifies if an {@link InternalError} should be thrown if no provider of
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86 * {@code service} is available
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87 * @throws SecurityException if a security manager is present and it denies
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88 * <tt>{@link RuntimePermission}("jvmciServices")</tt>
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89 */
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90 @SuppressWarnings({"unchecked"})
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91 @CallerSensitive
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92 public static <S> S loadSingle(Class<S> service, boolean required) {
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93 SecurityManager sm = System.getSecurityManager();
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94 if (sm != null) {
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95 sm.checkPermission(new RuntimePermission("jvmciServices"));
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96 }
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97 Iterable<S> providers;
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98 try {
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99 providers = (Iterable<S>) cache.get(service);
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100 } catch (UnsatisfiedLinkError e) {
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101 providers = Collections.emptyList();
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102 }
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103
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104 S singleProvider = null;
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105 for (S provider : providers) {
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106 if (singleProvider != null) {
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107 throw new InternalError(String.format("Multiple %s providers found: %s, %s", service.getName(), singleProvider.getClass().getName(), provider.getClass().getName()));
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108 }
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109 singleProvider = provider;
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110 }
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111 if (singleProvider == null && required) {
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112 String javaHome = System.getProperty("java.home");
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113 String vmName = System.getProperty("java.vm.name");
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114 Formatter errorMessage = new Formatter();
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115 errorMessage.format("The VM does not expose required service %s.%n", service.getName());
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116 errorMessage.format("Currently used Java home directory is %s.%n", javaHome);
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117 errorMessage.format("Currently used VM configuration is: %s", vmName);
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118 throw new UnsupportedOperationException(errorMessage.toString());
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119 }
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120 return singleProvider;
21614
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121 }
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122
21636
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123 static {
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124 Reflection.registerMethodsToFilter(Services.class, "getServiceImpls");
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125 Reflection.registerFieldsToFilter(Services.class, "cache");
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126 }
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127
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128 private static native <S> S[] getServiceImpls(Class<?> service);
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129 }