Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.services/src/jdk/vm/ci/services/JVMCIServiceLocator.java @ 24127:6d70d9c43369
added ResolvedJavaType.isPlatformType (JDK-8177845)
author | Doug Simon <doug.simon@oracle.com> |
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date | Sat, 15 Apr 2017 23:54:19 +0200 |
parents | 5cf445d2acf6 |
children |
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/* * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package jdk.vm.ci.services; import java.util.ArrayList; import java.util.List; /** * Service-provider class for the runtime to locate providers of JVMCI services where the latter are * not in packages exported by the JVMCI module. As part of instantiating * {@link JVMCIServiceLocator}, all JVMCI packages will be {@linkplain Services#exportJVMCITo(Class) * exported} to the module defining the class of the instantiated object. * * While the {@link #getProvider(Class)} method can be used directly, it's usually easier to use * {@link #getProviders(Class)}. */ public abstract class JVMCIServiceLocator { private static Void checkPermission() { SecurityManager sm = System.getSecurityManager(); if (sm != null) { sm.checkPermission(new JVMCIPermission()); } return null; } @SuppressWarnings("unused") private JVMCIServiceLocator(Void ignore) { } /** * Creates a capability for accessing JVMCI. Once successfully instantiated, JVMCI exports all * its packages to the module defining the type of this object. * * @throws SecurityException if a security manager has been installed and it denies * {@link JVMCIPermission} */ protected JVMCIServiceLocator() { this(checkPermission()); Services.exportJVMCITo(getClass()); } /** * Gets the provider of the service defined by {@code service} or {@code null} if this object * does not have a provider for {@code service}. */ public abstract <S> S getProvider(Class<S> service); /** * Gets the providers of the service defined by {@code service} by querying the * {@link JVMCIServiceLocator} providers obtained by {@link Services#load(Class)}. */ public static <S> List<S> getProviders(Class<S> service) { List<S> providers = new ArrayList<>(); for (JVMCIServiceLocator access : Services.load(JVMCIServiceLocator.class)) { S provider = access.getProvider(service); if (provider != null) { providers.add(provider); } } return providers; } }