Package: ServiceLoaderLocator

ServiceLoaderLocator

name	instruction	branch	complexity	line	method
findService(Class)	M: 31 C: 61 66%	M: 5 C: 5 50%	M: 4 C: 2 33%	M: 4 C: 16 80%	M: 0 C: 1 100%
getLogger()	M: 0 C: 3 100%	M: 0 C: 0 100%	M: 0 C: 1 100%	M: 0 C: 1 100%	M: 0 C: 1 100%
lambda$findService$0(Object)	M: 0 C: 9 100%	M: 0 C: 2 100%	M: 0 C: 2 100%	M: 0 C: 1 100%	M: 0 C: 1 100%
lambda$lazySupplierOf$1(Class)	M: 0 C: 3 100%	M: 0 C: 0 100%	M: 0 C: 1 100%	M: 0 C: 1 100%	M: 0 C: 1 100%
lazySupplierOf(Class)	M: 0 C: 4 100%	M: 0 C: 0 100%	M: 0 C: 1 100%	M: 0 C: 1 100%	M: 0 C: 1 100%
static {...}	M: 0 C: 8 100%	M: 0 C: 0 100%	M: 0 C: 1 100%	M: 0 C: 2 100%	M: 0 C: 1 100%

Coverage

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 the License.
12: * 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 an "AS IS" BASIS, WITHOUT WARRANTIES OR
17: * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
18: *
19: * *************************************************************************************************************************************************************
20: *
21: * git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
22: * git clone https://github.com/tidalwave-it/thesefoolishthings-src
23: *
24: * *************************************************************************************************************************************************************
25: */
26: package it.tidalwave.role.impl;
27:
28: import javax.annotation.Nonnull;
29: import java.util.ServiceLoader;
30: import java.util.Spliterators;
31: import java.util.stream.StreamSupport;
32: import org.slf4j.Logger;
33: import org.slf4j.LoggerFactory;
34: import it.tidalwave.util.LazySupplier;
35: import it.tidalwave.util.PreferencesHandler;
36: import it.tidalwave.role.spi.annotation.DefaultProvider;
37: import lombok.AccessLevel;
38: import lombok.NoArgsConstructor;
39: import static java.util.stream.Collectors.*;
40:
41: /***************************************************************************************************************************************************************
42: *
43: * @author Fabrizio Giudici
44: *
45: **************************************************************************************************************************************************************/
46: @NoArgsConstructor(access = AccessLevel.PRIVATE)
47: // PreferencesHandler can be used to programmatically set the log folder, so don't inject logger
48: public class ServiceLoaderLocator
49: {
50: public static final String PROPS_BASE_NAME = PreferencesHandler.class.getPackage().getName();
51:
52: /** Suppress any console output. @since 3.2-ALPHA-21 */
53: public static final String PROP_SUPPRESS_CONSOLE = PROPS_BASE_NAME + ".suppressConsoleOutput";
54:
55: /***********************************************************************************************************************************************************
56: *
57: **********************************************************************************************************************************************************/
58: @Nonnull
59: public static <T> T findService (@Nonnull final Class<? extends T> serviceClass)
60: {
61: final var serviceClassName = serviceClass.getSimpleName();
62: final var classLoader = Thread.currentThread().getContextClassLoader();
63: final var iterator = ServiceLoader.load(serviceClass, classLoader).iterator();
64: final var spliterator = Spliterators.spliteratorUnknownSize(iterator, 0);
65: var providers = StreamSupport.stream(spliterator, false).collect(toList());
66:
67:• if (providers.isEmpty())
68: {
69: throw new RuntimeException("No ServiceProvider for " + serviceClassName);
70: }
71:
72:• if (providers.size() > 1) // filter out the default one
73: {
74: getLogger().info("Too many instances of {}, using @DefaultProvider ...", serviceClassName);
75: providers = providers.stream()
76:• .filter(p -> p.getClass().getAnnotation(DefaultProvider.class) == null)
77: .collect(toList());
78: }
79:
80:• if (providers.size() > 1)
81: {
82: throw new RuntimeException("Too many instances of " + serviceClassName + " : " + providers);
83: }
84:
85: final var provider = providers.get(0);
86:
87: // PreferencesHandler can be used to programmatically set the log folder, so don't log yet
88:• if (!serviceClass.equals(PreferencesHandler.class))
89: {
90: getLogger().info("{} instantiated from META-INF/services: {}", serviceClassName, provider);
91: }
92:• else if (!Boolean.getBoolean(PROP_SUPPRESS_CONSOLE))
93: {
94: System.out.printf("%s instantiated from META-INF/services: %s%n", serviceClassName, provider);
95: }
96:
97: return provider;
98: }
99:
100: @Nonnull
101: public static <T> LazySupplier<T> lazySupplierOf (@Nonnull final Class<? extends T> clazz)
102: {
103: return LazySupplier.of(() -> findService(clazz));
104: }
105:
106: @Nonnull
107: private static Logger getLogger()
108: {
109: return LoggerFactory.getLogger(ServiceLoaderLocator.class);
110: }
111: }