方法调用：

(Class<? extends T>) ResolvableType.forClass(AbstractFailureAnalyzer.class, getClass()).resolveGeneric();

其中参数 getClass() 的值：class org.springframework.boot.diagnostics.AbstractFailureAnalyzer


/********** org.springframework.core.ResolvableType ******************/
public static ResolvableType forClass(Class<?> baseType, Class<?> implementationClass) {Assert.notNull(baseType, "Base type must not be null");// implementationClass : PortInUseFailureAnalyzer// baseType : AbstractFailureAnalyzerResolvableType asType = forType(implementationClass).as(baseType);return (asType == NONE ? forType(baseType) : asType);
}
static ResolvableType forType(@Nullable Type type, @Nullable TypeProvider typeProvider, @Nullable VariableResolver variableResolver) {if (type == null && typeProvider != null) {type = SerializableTypeWrapper.forTypeProvider(typeProvider);}if (type == null) {return NONE;}// For simple Class references, build the wrapper right away -// no expensive resolution necessary, so not worth caching...if (type instanceof Class) {// 端口占用异常直接在这里返回return new ResolvableType(type, typeProvider, variableResolver, (ResolvableType) null);}// Purge empty entries on access since we don't have a clean-up thread or the like.cache.purgeUnreferencedEntries();// Check the cache - we may have a ResolvableType which has been resolved before...ResolvableType resultType = new ResolvableType(type, typeProvider, variableResolver);ResolvableType cachedType = cache.get(resultType);if (cachedType == null) {cachedType = new ResolvableType(type, typeProvider, variableResolver, resultType.hash);cache.put(cachedType, cachedType);}resultType.resolved = cachedType.resolved;return resultType;
}private ResolvableType(Type type, @Nullable TypeProvider typeProvider,@Nullable VariableResolver variableResolver, @Nullable ResolvableType componentType) {this.type = type;this.typeProvider = typeProvider;this.variableResolver = variableResolver;this.componentType = componentType;this.hash = null;this.resolved = resolveClass();
}
@Nullable
private Class<?> resolveClass() {if (this.type == EmptyType.INSTANCE) {return null;}if (this.type instanceof Class) {// 本例直接在这里返回this.type,也就是实际的类型return (Class<?>) this.type;}if (this.type instanceof GenericArrayType) {Class<?> resolvedComponent = getComponentType().resolve();return (resolvedComponent != null ? Array.newInstance(resolvedComponent, 0).getClass() : null);}return resolveType().resolve();
}

public ResolvableType getGeneric(@Nullable int... indexes) {ResolvableType[] generics = getGenerics();if (indexes == null || indexes.length == 0) {return (generics.length == 0 ? NONE : generics[0]);}ResolvableType generic = this;for (int index : indexes) {generics = generic.getGenerics();if (index < 0 || index >= generics.length) {return NONE;}generic = generics[index];}return generic;
}
public ResolvableType[] getGenerics() {if (this == NONE) {return EMPTY_TYPES_ARRAY;}ResolvableType[] generics = this.generics;if (generics == null) {if (this.type instanceof Class) {Type[] typeParams = ((Class<?>) this.type).getTypeParameters();generics = new ResolvableType[typeParams.length];for (int i = 0; i < generics.length; i++) {generics[i] = ResolvableType.forType(typeParams[i], this);}}else if (this.type instanceof ParameterizedType) {Type[] actualTypeArguments = ((ParameterizedType) this.type).getActualTypeArguments();generics = new ResolvableType[actualTypeArguments.length];for (int i = 0; i < actualTypeArguments.length; i++) {generics[i] = forType(actualTypeArguments[i], this.variableResolver);}}else {generics = resolveType().getGenerics();}this.generics = generics;}return generics;
}

给this.generics赋值的调用栈

getGenerics:712, ResolvableType (org.springframework.core)
getGeneric:661, ResolvableType (org.springframework.core)
resolveGeneric:763, ResolvableType (org.springframework.core)
getCauseType:56, AbstractFailureAnalyzer (org.springframework.boot.diagnostics)
analyze:33, AbstractFailureAnalyzer (org.springframework.boot.diagnostics)
analyze:111, FailureAnalyzers (org.springframework.boot.diagnostics)
reportException:104, FailureAnalyzers (org.springframework.boot.diagnostics)
reportFailure:816, SpringApplication (org.springframework.boot)
handleRunFailure:801, SpringApplication (org.springframework.boot)
run:325, SpringApplication (org.springframework.boot)
setInitializer:30, HelloSpringBootApplication (com.yh.stu.springboot)
main:24, HelloSpringBootApplication (com.yh.stu.springboot)getGenerics:693, ResolvableType (org.springframework.core)
getGeneric:661, ResolvableType (org.springframework.core)
resolveGeneric:763, ResolvableType (org.springframework.core)
getCauseType:56, AbstractFailureAnalyzer (org.springframework.boot.diagnostics)
analyze:33, AbstractFailureAnalyzer (org.springframework.boot.diagnostics)
analyze:111, FailureAnalyzers (org.springframework.boot.diagnostics)
reportException:104, FailureAnalyzers (org.springframework.boot.diagnostics)
reportFailure:816, SpringApplication (org.springframework.boot)
handleRunFailure:801, SpringApplication (org.springframework.boot)
run:325, SpringApplication (org.springframework.boot)
setInitializer:30, HelloSpringBootApplication (com.yh.stu.springboot)
main:24, HelloSpringBootApplication (com.yh.stu.springboot)

案例1 PortInUseFailureAnalyzer.getCauseType

getCauseType 在父类 AbstractFailureAnalyzer 中

/********** org.springframework.boot.diagnostics.AbstractFailureAnalyzer ******************/protected Class<? extends T> getCauseType() {// getClass() 调用的是子类PortInUseFailureAnalyzer的 classreturn (Class<? extends T>) ResolvableType.forClass(AbstractFailureAnalyzer.class, getClass()).resolveGeneric();
}/********** org.springframework.core.ResolvableType ******************/
public static ResolvableType forClass(Class<?> baseType, Class<?> implementationClass) {Assert.notNull(baseType, "Base type must not be null");ResolvableType asType = forType(implementationClass).as(baseType);return (asType == NONE ? forType(baseType) : asType);
}

我们将 ResolvableType asType = forType(implementationClass).as(baseType) 这行代码拆分一下：

// implementationClass 就是 PortInUseFailureAnalyzer.class
ResolvableType forType= forType(implementationClass);
// baseType 就是 AbstractFailureAnalyzer.class
ResolvableType asType = forType.as(baseType);

1、创建 PortInUseFailureAnalyzer 的 ResolvableType

this.type = PortInUseFailureAnalyzer.class
this.resolved = PortInUseFailureAnalyzer.class

2、创建父类 AbstractFailureAnalyzer 的 ResolvableType

/********** org.springframework.core.ResolvableType ******************/
public ResolvableType as(Class<?> type) {if (this == NONE) {return NONE;}Class<?> resolved = resolve();// 方法就是 return this.resolved，PortInUseFailureAnalyzer.classif (resolved == null || resolved == type) {return this;}for (ResolvableType interfaceType : getInterfaces()) { // 方法返回空集合ResolvableType interfaceAsType = interfaceType.as(type);if (interfaceAsType != NONE) {return interfaceAsType;}}return getSuperType().as(type);
}public ResolvableType getSuperType() {Class<?> resolved = resolve();// 方法就是 return this.resolved，PortInUseFailureAnalyzer.classif (resolved == null || resolved.getGenericSuperclass() == null) {return NONE;}ResolvableType superType = this.superType;if (superType == null) {// 创建superType = forType(resolved.getGenericSuperclass(), this);this.superType = superType;}return superType;
}public static ResolvableType forType(@Nullable Type type, @Nullable ResolvableType owner) {VariableResolver variableResolver = null;if (owner != null) {variableResolver = owner.asVariableResolver();}return forType(type, variableResolver);
}

ResolvableType asType = rt.as(AbstractFailureAnalyzer.class)

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A 附录、ResolvableType

案例1 PortInUseFailureAnalyzer.getCauseType

1、创建 PortInUseFailureAnalyzer 的 ResolvableType

2、创建父类 AbstractFailureAnalyzer 的 ResolvableType

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