spring InvocationContext 源码
springboot InvocationContext 代码
文件路径:/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/InvocationContext.java
/*
* Copyright 2012-2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* 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 CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.boot.actuate.endpoint;
import java.security.Principal;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import org.springframework.boot.actuate.endpoint.invoke.OperationInvoker;
import org.springframework.util.Assert;
/**
* The context for the {@link OperationInvoker invocation of an operation}.
*
* @author Andy Wilkinson
* @author Phillip Webb
* @since 2.0.0
*/
public class InvocationContext {
private final Map<String, Object> arguments;
private final List<OperationArgumentResolver> argumentResolvers;
/**
* Creates a new context for an operation being invoked by the given
* {@code securityContext} with the given available {@code arguments}.
* @param securityContext the current security context. Never {@code null}
* @param arguments the arguments available to the operation. Never {@code null}
* @param argumentResolvers resolvers for additional arguments should be available to
* the operation.
*/
public InvocationContext(SecurityContext securityContext, Map<String, Object> arguments,
OperationArgumentResolver... argumentResolvers) {
Assert.notNull(securityContext, "SecurityContext must not be null");
Assert.notNull(arguments, "Arguments must not be null");
this.arguments = arguments;
this.argumentResolvers = new ArrayList<>();
if (argumentResolvers != null) {
this.argumentResolvers.addAll(Arrays.asList(argumentResolvers));
}
this.argumentResolvers.add(OperationArgumentResolver.of(SecurityContext.class, () -> securityContext));
this.argumentResolvers.add(OperationArgumentResolver.of(Principal.class, securityContext::getPrincipal));
this.argumentResolvers.add(OperationArgumentResolver.of(ApiVersion.class, () -> ApiVersion.LATEST));
}
/**
* Return the invocation arguments.
* @return the arguments
*/
public Map<String, Object> getArguments() {
return this.arguments;
}
/**
* Resolves an argument with the given {@code argumentType}.
* @param <T> type of the argument
* @param argumentType type of the argument
* @return resolved argument of the required type or {@code null}
* @since 2.5.0
* @see #canResolve(Class)
*/
public <T> T resolveArgument(Class<T> argumentType) {
for (OperationArgumentResolver argumentResolver : this.argumentResolvers) {
if (argumentResolver.canResolve(argumentType)) {
T result = argumentResolver.resolve(argumentType);
if (result != null) {
return result;
}
}
}
return null;
}
/**
* Returns whether the context is capable of resolving an argument of the given
* {@code type}. Note that, even when {@code true} is returned,
* {@link #resolveArgument argument resolution} will return {@code null} if no
* argument of the required type is available.
* @param type argument type
* @return {@code true} if resolution of arguments of the given type is possible,
* otherwise {@code false}.
* @since 2.5.0
* @see #resolveArgument(Class)
*/
public boolean canResolve(Class<?> type) {
for (OperationArgumentResolver argumentResolver : this.argumentResolvers) {
if (argumentResolver.canResolve(type)) {
return true;
}
}
return false;
}
}
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- 本文标签: Spring Boot Spring Java
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