/*

 * Copyright (c) 2005, 2012, 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.

 */

//

import java.io.*;

import java.util.*;

public class Basic {

    private static PrintStream out = System.err;

    private static <T> Set<T> setOf(Iterable<T> it) {

        Set<T> s = new HashSet<T>();

        for (T t : it)

            s.add(t);

        return s;

    }

    private static <T> void checkEquals(Set<T> s1, Set<T> s2, boolean eq) {

        if (s1.equals(s2) != eq)

            throw new RuntimeException(String.format("%b %s : %s",

                                                     eq, s1, s2));

    }

        String name;

        TestLoader(String name) { this.name = name; }

        abstract ServiceLoader<FooService> load();

    }

    static TestLoader tcclLoader = new TestLoader("Thread context class loader") {

        ServiceLoader<FooService> load() {

            return ServiceLoader.load(FooService.class);

        }

    };

    static TestLoader systemClLoader = new TestLoader("System class loader") {

        ServiceLoader<FooService> load() {

            return ServiceLoader.load(FooService.class, ClassLoader.getSystemClassLoader());

        }

    };

    static TestLoader nullClLoader = new TestLoader("null (defer to system class loader)") {

        ServiceLoader<FooService> load() {

            return ServiceLoader.load(FooService.class, null);

        }

    };

    public static void main(String[] args) {

        for (TestLoader tl : Arrays.asList(tcclLoader, systemClLoader, nullClLoader)) {

            test(tl);

        }

    }

    static void test(TestLoader tl) {

        ServiceLoader<FooService> sl = tl.load();

        out.format("%s: %s%n", tl.name, sl);

        // Providers are cached

        Set<FooService> ps = setOf(sl);

        checkEquals(ps, setOf(sl), true);

        // The cache can be flushed and reloaded

        sl.reload();

        checkEquals(ps, setOf(sl), false);

    }

}