russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
94 lines
2.9 KiB
Java
94 lines
2.9 KiB
Java
/*
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package p;
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import java.util.List;
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import java.util.ServiceLoader;
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import java.util.stream.Collectors;
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/**
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* Basic test of ServiceLoader with a provider interface and 3 provider
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* implementations.
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*
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* The provider interface (test.Main.Provider) defines a static factory method
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* name "provider" that locates a provider implementation. At least one of the
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* provider implementations does not define a static "provider" method.
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*/
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public class Main {
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public static void main(String[] args) {
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List<S> providers = ServiceLoader.load(S.class).stream()
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.map(ServiceLoader.Provider::get)
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.collect(Collectors.toList());
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if (providers.size() != 3)
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throw new RuntimeException("Expected 3 providers");
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}
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/**
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* Service type
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*/
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public static interface S {
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}
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/**
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* Base implementation, its static provider method should never be called
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*/
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public static class BaseProvider implements S {
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protected BaseProvider() { }
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public static S provider() {
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throw new RuntimeException("Should not get here");
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}
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}
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/**
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* Provider implementation with public constructor.
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*/
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public static class P1 extends BaseProvider {
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public P1() { }
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}
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/**
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* Provider implementation with static factory method.
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*/
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public static class P2 extends BaseProvider {
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private P2() { }
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public static P2 provider() {
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return new P2();
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}
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}
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/**
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* Provider implementation with static factory method and public
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* constructor.
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*/
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public static class P3 extends BaseProvider {
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public P3() {
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throw new RuntimeException("Should not get here");
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}
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private P3(int x) { }
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public static S provider() {
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return new P3(0);
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}
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}
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}
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