6、异常报告器解析

• Z时代
• 2024-01-10
• 分类：综合

public ConfigurableApplicationContext run(String... args) {  
     Collection<springbootexceptionreporter> exceptionReporters = new ArrayList<>();  
     // 删去了部分代码,在调用run方法时会初始化异常报告器集合
     exceptionReporters = getSpringFactoriesInstances(SpringBootExceptionReporter.class,  
                                                new Class[] { ConfigurableApplicationContext.class }, context);
     return context;  
}
private <t> Collection<t> getSpringFactoriesInstances(Class<t> type, Class<?>[] parameterTypes, Object... args) {  
     ClassLoader classLoader = getClassLoader();  
     // Use names and ensure unique to protect against duplicates  
     Set<string> names = new LinkedHashSet<>(SpringFactoriesLoader.loadFactoryNames(type, classLoader));  
     // 也是通过SpringFactoriesLoader技术来加载,见下图,默认就一个,这边实例化会调用其构造函数
     List<t> instances = createSpringFactoriesInstances(type, parameterTypes, classLoader, args, names);  
     AnnotationAwareOrderComparator.sort(instances);  
     return instances;  
}

FailureAnalyzers(ConfigurableApplicationContext context, ClassLoader classLoader) {  
    this.classLoader = (classLoader != null) ? classLoader : context.getClassLoader();  
    // 获取容器中FailureAnalyzer实例对象并排序
    this.analyzers = loadFailureAnalyzers(this.classLoader);  
    prepareFailureAnalyzers(this.analyzers, context);  
}

private List<failureanalyzer> loadFailureAnalyzers(ClassLoader classLoader) {  
    List<string> analyzerNames = SpringFactoriesLoader.loadFactoryNames(FailureAnalyzer.class, classLoader);  
    List<failureanalyzer> analyzers = new ArrayList<>();  
    for (String analyzerName : analyzerNames) {  
        try {  
            Constructor<?> constructor = ClassUtils.forName(analyzerName, classLoader).getDeclaredConstructor();  
            ReflectionUtils.makeAccessible(constructor);  
            analyzers.add((FailureAnalyzer) constructor.newInstance());  
        }  
    }  
    AnnotationAwareOrderComparator.sort(analyzers);  
    return analyzers;  
}

private void prepareFailureAnalyzers(List<failureanalyzer> analyzers, ConfigurableApplicationContext context) {  
    for (FailureAnalyzer analyzer : analyzers) {  
         prepareAnalyzer(context, analyzer);  
    }  
}  
private void prepareAnalyzer(ConfigurableApplicationContext context, FailureAnalyzer analyzer) {  
    if (analyzer instanceof BeanFactoryAware) {  
        ((BeanFactoryAware) analyzer).setBeanFactory(context.getBeanFactory());  
    }  
    if (analyzer instanceof EnvironmentAware) {  
        ((EnvironmentAware) analyzer).setEnvironment(context.getEnvironment());  
    }  
}

```</failureanalyzer></failureanalyzer></string></failureanalyzer></t></string></t></t></t></springbootexceptionreporter>

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