| /* |
| * Copyright (c) 2016, 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; |
| } |
| } |