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annotate jvmci/jdk.vm.ci.services/src/jdk/vm/ci/services/JVMCIServiceLocator.java @ 24234:ea6f94ab283b default tip

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Added tag jvmci-0.36 for changeset 8128b98d4736
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Mon, 18 Sep 2017 18:49:45 +0200
parents 5cf445d2acf6
children
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1 /*
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2 * Copyright (c) 2015, 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.ArrayList;
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26 import java.util.List;
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27
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28 /**
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29 * Service-provider class for the runtime to locate providers of JVMCI services where the latter are
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30 * not in packages exported by the JVMCI module. As part of instantiating
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31 * {@link JVMCIServiceLocator}, all JVMCI packages will be {@linkplain Services#exportJVMCITo(Class)
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32 * exported} to the module defining the class of the instantiated object.
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33 *
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34 * While the {@link #getProvider(Class)} method can be used directly, it's usually easier to use
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35 * {@link #getProviders(Class)}.
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36 */
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37 public abstract class JVMCIServiceLocator {
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38
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39 private static Void checkPermission() {
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40 SecurityManager sm = System.getSecurityManager();
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41 if (sm != null) {
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42 sm.checkPermission(new JVMCIPermission());
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43 }
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44 return null;
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45 }
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46
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47 @SuppressWarnings("unused")
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48 private JVMCIServiceLocator(Void ignore) {
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49 }
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50
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51 /**
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52 * Creates a capability for accessing JVMCI. Once successfully instantiated, JVMCI exports all
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53 * its packages to the module defining the type of this object.
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54 *
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55 * @throws SecurityException if a security manager has been installed and it denies
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56 * {@link JVMCIPermission}
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57 */
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58 protected JVMCIServiceLocator() {
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59 this(checkPermission());
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60 Services.exportJVMCITo(getClass());
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61 }
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62
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63 /**
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64 * Gets the provider of the service defined by {@code service} or {@code null} if this object
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65 * does not have a provider for {@code service}.
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66 */
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67 public abstract <S> S getProvider(Class<S> service);
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68
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69 /**
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70 * Gets the providers of the service defined by {@code service} by querying the
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71 * {@link JVMCIServiceLocator} providers obtained by {@link Services#load(Class)}.
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72 */
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73 public static <S> List<S> getProviders(Class<S> service) {
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74 List<S> providers = new ArrayList<>();
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75 for (JVMCIServiceLocator access : Services.load(JVMCIServiceLocator.class)) {
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76 S provider = access.getProvider(service);
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77 if (provider != null) {
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78 providers.add(provider);
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79 }
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80 }
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81 return providers;
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82 }
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83 }