Method: static {...}

1: /*
2: * *********************************************************************************************************************
3: *
4: * TheseFoolishThings: Miscellaneous utilities
5: * http://tidalwave.it/projects/thesefoolishthings
6: *
7: * Copyright (C) 2009 - 2024 by Tidalwave s.a.s. (http://tidalwave.it)
8: *
9: * *********************************************************************************************************************
10: *
11: * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
12: * the License. You may obtain a copy of the License at
13: *
14: * http://www.apache.org/licenses/LICENSE-2.0
15: *
16: * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
17: * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
18: * specific language governing permissions and limitations under the License.
19: *
20: * *********************************************************************************************************************
21: *
22: * git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
23: * git clone https://github.com/tidalwave-it/thesefoolishthings-src
24: *
25: * *********************************************************************************************************************
26: */
27: package it.tidalwave.role.spi;
28:
29: import javax.annotation.Nonnull;
30: import java.util.List;
31: import it.tidalwave.util.LazySupplier;
32: import static it.tidalwave.role.impl.ServiceLoaderLocator.lazySupplierOf;
33:
34: /***********************************************************************************************************************
35: *
36: * A service which retrieves DCI Roles for a given object.
37: *
38: * @author Fabrizio Giudici
39: *
40: **********************************************************************************************************************/
41: @FunctionalInterface
42: public interface SystemRoleFactory
43: {
44: static class Inner
45: {
46: private static final LazySupplier<SystemRoleFactory> INSTANCE_REF =
47: LazySupplier.of(() -> Inner.PROVIDER_REF.get().getSystemRoleFactory());
48:
49: private static final LazySupplier<SystemRoleFactoryProvider> PROVIDER_REF =
50: lazySupplierOf(SystemRoleFactoryProvider.class);
51: }
52:
53: /*******************************************************************************************************************
54: *
55: ******************************************************************************************************************/
56: @Nonnull
57: public static SystemRoleFactory getInstance()
58: {
59: return Inner.INSTANCE_REF.get();
60: }
61:
62: /*******************************************************************************************************************
63: *
64: * Removes a previously installed {@link SystemRoleFactory}. <b>This method is for testing only (used to clean up a
65: * testing context).</b>
66: *
67: * @see #set(SystemRoleFactory)
68: *
69: ******************************************************************************************************************/
70: public static void reset()
71: {
72: Inner.PROVIDER_REF.clear();
73: Inner.INSTANCE_REF.clear();
74: }
75:
76: /*******************************************************************************************************************
77: *
78: * Installs a {@link SystemRoleFactory}. <b>This method is for testing only (used to set up a testing context).</b>
79: *
80: * @param systemRoleFactory the {@link SystemRoleFactory}
81: * @see #reset()
82: *
83: ******************************************************************************************************************/
84: public static void set (@Nonnull final SystemRoleFactory systemRoleFactory)
85: {
86: Inner.PROVIDER_REF.set(() -> systemRoleFactory);
87: }
88:
89: /*******************************************************************************************************************
90: *
91: * Retrieves the roles of the given class for the given owner object.
92: *
93: * @param <T> the static type of the roles
94: * @param owner the owner object
95: * @param roleType the dynamic type of the roles
96: * @return a list of roles
97: *
98: ******************************************************************************************************************/
99: @Nonnull
100: public <T> List<T> findRoles (@Nonnull Object owner, @Nonnull Class<? extends T> roleType);
101: }