一起学Java(12)-[日志篇]教你分析SLF4J源码，掌握SLF4J如何与Logback无缝集成的原理

1com.example.impl.MyServiceImpl1
2com.example.impl.MyServiceImpl2

1ServiceLoader<MyService> serviceLoader = ServiceLoader.load(MyService.class);
2for (MyService service : serviceLoader) {
3    service.doSomething(); // doSomething是MyService接口中定义的方法
4}

1ch.qos.logback.classic.spi.LogbackServiceProvider

1private final static void bind() {
2        try {
3            List<SLF4JServiceProvider> providersList = findServiceProviders();
4            reportMultipleBindingAmbiguity(providersList);
5            if (providersList != null && !providersList.isEmpty()) {
6                PROVIDER = providersList.get(0);
7                // SLF4JServiceProvider.initialize() is intended to be called here and nowhere else.
8                PROVIDER.initialize();
9                INITIALIZATION_STATE = SUCCESSFUL_INITIALIZATION;
10                reportActualBinding(providersList);
11            } else {
12                INITIALIZATION_STATE = NOP_FALLBACK_INITIALIZATION;
13                Reporter.warn("No SLF4J providers were found.");
14                Reporter.warn("Defaulting to no-operation (NOP) logger implementation");
15                Reporter.warn("See " + NO_PROVIDERS_URL + " for further details.");
16
17                Set<URL> staticLoggerBinderPathSet = findPossibleStaticLoggerBinderPathSet();
18                reportIgnoredStaticLoggerBinders(staticLoggerBinderPathSet);
19            }
20            postBindCleanUp();
21        } catch (Exception e) {
22            failedBinding(e);
23            throw new IllegalStateException("Unexpected initialization failure", e);
24        }
25    }