1 /*

     2  * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 //

    25 

    26 import java.io.*;

    27 import java.util.*;

    28 

    29 

    30 public class Basic {

    31 

    32     private static PrintStream out = System.err;

    33 

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

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

    36         for (T t : it)

    37             s.add(t);

    38         return s;

    39     }

    40 

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

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

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

    44                                                      eq, s1, s2));

    45     }

    46 

    47     abstract static class TestLoader {

    48         String name;

    49 

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

    51 

    52         abstract ServiceLoader<FooService> load();

    53     }

    54 

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

    56         ServiceLoader<FooService> load() {

    57             return ServiceLoader.load(FooService.class);

    58         }

    59     };

    60 

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

    62         ServiceLoader<FooService> load() {

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

    64         }

    65     };

    66 

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

    68         ServiceLoader<FooService> load() {

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

    70         }

    71     };

    72 

    73     public static void main(String[] args) {

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

    75             test(tl);

    76         }

    77     }

    78 

    79     static void test(TestLoader tl) {

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

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

    82 

    83         // Providers are cached

    84         Set<FooService> ps = setOf(sl);

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

    86 

    87         // The cache can be flushed and reloaded

    88         sl.reload();

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

    90 

    91     }

    92 }