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annotate graal/com.oracle.jvmci.service/src/com/oracle/jvmci/service/Services.java @ 21614:2f92172fa320

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Truffle and NFI implementations are now accessed via JVMCI services instead of being hard coded in the VM (JBS:GRAAL-51)
author Doug Simon <doug.simon@oracle.com>
date Sun, 31 May 2015 13:42:47 +0200
parents 71b338926f2e
children 9966b358bc2b
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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 static java.lang.String.*;
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26
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27 import java.util.*;
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28
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29 import sun.reflect.*;
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30
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31 /**
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32 * A mechanism on top of the standard {@link ServiceLoader} that enables JVMCI enabled runtime to
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33 * efficiently load services marked by {@link Service}. This is important to avoid the performance
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34 * overhead of the standard service loader mechanism for services loaded in the runtime
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35 * initialization process.
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36 */
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37 public class Services {
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38
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39 private static final ClassValue<List<Service>> cache = new ClassValue<List<Service>>() {
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40 @Override
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41 protected List<Service> computeValue(Class<?> type) {
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42 Service[] names = getServiceImpls(type);
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43 if (names == null || names.length == 0) {
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44 throw new InternalError(
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45 format("No implementations for %s found (ensure %s extends %s and that in suite.py the \"annotationProcessors\" attribute for the project enclosing %s includes \"com.oracle.jvmci.service.processor\")",
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46 type.getSimpleName(), type.getSimpleName(), Service.class, type.getSimpleName()));
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47 }
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48 return Arrays.asList(names);
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49 }
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50 };
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51
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52 /**
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53 * Gets an {@link Iterable} of the implementations available for a given service.
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54 */
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55 @SuppressWarnings("unchecked")
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56 @CallerSensitive
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57 public static <S> Iterable<S> load(Class<S> service) {
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58 // TODO(ds): add SecurityManager checks
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59 if (Service.class.isAssignableFrom(service)) {
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60 try {
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61 return (Iterable<S>) cache.get(service);
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62 } catch (UnsatisfiedLinkError e) {
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63 // Fall back to standard ServiceLoader
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64 }
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65 }
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66
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67 // Need to use the ClassLoader of the caller
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68 ClassLoader cl = Reflection.getCallerClass().getClassLoader();
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69 return ServiceLoader.load(service, cl);
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70 }
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71
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72 /**
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73 * Gets the implementation for a given service for which at most one implementation must be
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74 * available.
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75 *
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76 * @param service the service whose implementation is being requested
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77 * @param required specifies if an {@link InternalError} should be thrown if no implementation
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78 * of {@code service} is available
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79 */
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80 @SuppressWarnings("unchecked")
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81 @CallerSensitive
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82 public static <S> S loadSingle(Class<S> service, boolean required) {
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83 // TODO(ds): add SecurityManager checks
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84 Iterable<S> impls = null;
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85 if (Service.class.isAssignableFrom(service)) {
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86 try {
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87 impls = (Iterable<S>) cache.get(service);
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88 } catch (UnsatisfiedLinkError e) {
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89 // Fall back to standard ServiceLoader
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90 }
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91 }
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92
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93 if (impls == null) {
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94 // Need to use the ClassLoader of the caller
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95 ClassLoader cl = Reflection.getCallerClass().getClassLoader();
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96 impls = ServiceLoader.load(service, cl);
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97 }
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98 S singleImpl = null;
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99 for (S impl : impls) {
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100 if (singleImpl != null) {
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101 throw new InternalError(String.format("Multiple %s implementations found: %s, %s", service.getName(), singleImpl.getClass().getName(), impl.getClass().getName()));
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102 }
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103 singleImpl = impl;
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104 }
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105 if (singleImpl == null && required) {
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106 String javaHome = System.getProperty("java.home");
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107 String vmName = System.getProperty("java.vm.name");
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108 Formatter errorMessage = new Formatter();
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109 errorMessage.format("The VM does not expose required service %s.%n", service.getName());
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110 errorMessage.format("Currently used Java home directory is %s.%n", javaHome);
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111 errorMessage.format("Currently used VM configuration is: %s", vmName);
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112 throw new UnsupportedOperationException(errorMessage.toString());
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113 }
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114 return singleImpl;
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115 }
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116
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117 private static native <S> S[] getServiceImpls(Class<?> service);
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118 }