spring-graphql ThreadLocalAccessor 源码
spring-graphql ThreadLocalAccessor 代码
文件路径：/spring-graphql/src/main/java/org/springframework/graphql/execution/ThreadLocalAccessor.java
/*
* Copyright 2002-2022 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.graphql.execution;
import java.util.List;
import java.util.Map;
import org.springframework.beans.factory.ObjectProvider;
/**
* Interface to be implemented to assist with the extraction of ThreadLocal
* values at the start of GraphQL request execution, e.g. in the web layer.
* Those values are saved in {@link graphql.ExecutionInput} and restored later
* around the invocation of data fetchers and exception resolvers which may be
* in a different thread.
*
* <p>Implementations of this interface are typically declared as beans in
* Spring configuration and are invoked in order as defined in
* {@link ObjectProvider#orderedStream()}.
*
* <p>Currently supported for GraphQL requests over HTTP and WebSocket in
* Spring MVC applications.
*
* @author Rossen Stoyanchev
* @since 1.0.0
* @see org.springframework.graphql.server.WebGraphQlHandler.Builder#threadLocalAccessor(ThreadLocalAccessor...)
*/
public interface ThreadLocalAccessor {
/**
* Extract ThreadLocal values and add them to the given Map, so they can be
* saved and subsequently {@link #restoreValues(Map) restored} around the
* invocation of data fetchers and exception resolvers.
* @param container to add extracted ThreadLocal values to
*/
void extractValues(Map<String, Object> container);
/**
* Restore ThreadLocal context by looking up previously
* {@link #extractValues(Map) extracted} values.
* @param values previously extracted saved ThreadLocal values
*/
void restoreValues(Map<String, Object> values);
/**
* Reset ThreadLocal context for the given, previously
* {@link #extractValues(Map) extracted} and then
* {@link #restoreValues(Map) restored} values.
* @param values previously extracted saved ThreadLocal values
*/
void resetValues(Map<String, Object> values);
/**
* Create a composite accessor that applies all of the given ThreadLocal accessors.
* @param accessors the accessors to apply
* @return the composite accessor
*/
static ThreadLocalAccessor composite(List<ThreadLocalAccessor> accessors) {
return new CompositeThreadLocalAccessor(accessors);
}
}
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