Mercurial > hg > truffle
view graal/com.oracle.jvmci.runtime/src/com/oracle/jvmci/runtime/Services.java @ 21586:6da76343d830
Merge.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
---|---|
date | Fri, 29 May 2015 12:09:07 +0200 |
parents | d563baeca9df |
children |
line wrap: on
line source
/* * Copyright (c) 2014, 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 com.oracle.jvmci.runtime; import static java.lang.String.*; import java.util.*; /** * A mechanism on top of the standard {@link ServiceLoader} that enables a runtime to efficiently * load services marked by {@link Service}. This may be important for services loaded early in the * runtime initialization process. */ public class Services { private static final ClassValue<List<Service>> cache = new ClassValue<List<Service>>() { @Override protected List<Service> computeValue(Class<?> type) { Service[] names = getServiceImpls(type); if (names == null || names.length == 0) { throw new InternalError( 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.runtime.processor\")", type.getSimpleName(), type.getSimpleName(), Service.class, type.getSimpleName())); } return Arrays.asList(names); } }; /** * Gets an {@link Iterable} of the implementations available for a given service. */ @SuppressWarnings("unchecked") public static <S> Iterable<S> load(Class<S> service) { if (Service.class.isAssignableFrom(service)) { try { return (Iterable<S>) cache.get(service); } catch (UnsatisfiedLinkError e) { // Fall back to standard SerivceLoader } } return ServiceLoader.load(service, Services.class.getClassLoader()); } private static native <S> S[] getServiceImpls(Class<?> service); }