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annotate graal/com.oracle.jvmci.service/src/com/oracle/jvmci/service/Services.java @ 21607:71b338926f2e

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moved JVMCI classes into their own distributions (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Fri, 29 May 2015 22:27:38 +0200
parents 93f282187d90
children 2f92172fa320
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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 a runtime to efficiently
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33 * load services marked by {@link Service}. This may be important for services loaded early in the
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34 * runtime initialization process.
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35 */
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36 public class Services {
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37
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38 private static final ClassValue<List<Service>> cache = new ClassValue<List<Service>>() {
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39 @Override
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40 protected List<Service> computeValue(Class<?> type) {
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41 Service[] names = getServiceImpls(type);
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42 if (names == null || names.length == 0) {
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43 throw new InternalError(
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44 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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45 type.getSimpleName(), type.getSimpleName(), Service.class, type.getSimpleName()));
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46 }
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47 return Arrays.asList(names);
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48 }
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49 };
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50
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51 /**
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52 * Gets an {@link Iterable} of the implementations available for a given service.
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53 */
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54 @SuppressWarnings("unchecked")
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55 @CallerSensitive
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56 public static <S> Iterable<S> load(Class<S> service) {
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57 if (Service.class.isAssignableFrom(service)) {
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58 try {
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59 return (Iterable<S>) cache.get(service);
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60 } catch (UnsatisfiedLinkError e) {
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61 // Fall back to standard ServiceLoader
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62 }
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63 }
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64
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65 // Need to use the ClassLoader of the caller
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66 ClassLoader cl = Reflection.getCallerClass().getClassLoader();
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67 return ServiceLoader.load(service, cl);
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68 }
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69
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70 private static native <S> S[] getServiceImpls(Class<?> service);
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71 }