spring-graphql DataFetcherExceptionResolverAdapter 源码
spring-graphql DataFetcherExceptionResolverAdapter 代码
文件路径:/spring-graphql/src/main/java/org/springframework/graphql/execution/DataFetcherExceptionResolverAdapter.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.Collections;
import java.util.List;
import java.util.function.BiFunction;
import graphql.GraphQLError;
import graphql.schema.DataFetchingEnvironment;
import reactor.core.publisher.Mono;
import reactor.util.context.ContextView;
import org.springframework.lang.Nullable;
/**
* Adapter for {@link DataFetcherExceptionResolver} that pre-implements the
* asynchronous contract and exposes the following synchronous protected methods:
* <ul>
* <li>{@link #resolveToSingleError}
* <li>{@link #resolveToMultipleErrors}
* </ul>
*
* <p>Applications may also use
* {@link DataFetcherExceptionResolver#forSingleError(BiFunction)} as a shortcut
* for {@link #resolveToSingleError(Throwable, DataFetchingEnvironment)}.
*
* <p>Implementations can also express interest in ThreadLocal context
* propagation, from the underlying transport thread, via
* {@link #setThreadLocalContextAware(boolean)}.
*
* @author Rossen Stoyanchev
* @since 1.0.0
*/
public abstract class DataFetcherExceptionResolverAdapter implements DataFetcherExceptionResolver {
private boolean threadLocalContextAware;
/**
* Protected constructor since this class is meant to be extended to provide
* the actual exception resolution logic.
*/
protected DataFetcherExceptionResolverAdapter() {
}
/**
* Subclasses can set this to indicate that ThreadLocal context from the
* transport handler (e.g. HTTP handler) should be restored when resolving
* exceptions.
* <p><strong>Note:</strong> This property is applicable only if transports
* use ThreadLocal's' (e.g. Spring MVC) and if a {@link ThreadLocalAccessor}
* is registered to extract ThreadLocal values of interest. There is no
* impact from setting this property otherwise.
* <p>By default this is set to "false" in which case there is no attempt
* to propagate ThreadLocal context.
* @param threadLocalContextAware whether this resolver needs access to
* ThreadLocal context or not.
*/
public void setThreadLocalContextAware(boolean threadLocalContextAware) {
this.threadLocalContextAware = threadLocalContextAware;
}
/**
* Whether ThreadLocal context needs to be restored for this resolver.
*/
public boolean isThreadLocalContextAware() {
return this.threadLocalContextAware;
}
@Override
public final Mono<List<GraphQLError>> resolveException(Throwable ex, DataFetchingEnvironment env) {
return Mono.defer(() -> Mono.justOrEmpty(resolveInternal(ex, env)));
}
@Nullable
private List<GraphQLError> resolveInternal(Throwable ex, DataFetchingEnvironment env) {
if (!this.threadLocalContextAware) {
return resolveToMultipleErrors(ex, env);
}
ContextView contextView = ReactorContextManager.getReactorContext(env.getGraphQlContext());
try {
ReactorContextManager.restoreThreadLocalValues(contextView);
return resolveToMultipleErrors(ex, env);
}
finally {
ReactorContextManager.resetThreadLocalValues(contextView);
}
}
/**
* Override this method to resolve an Exception to multiple GraphQL errors.
* @param ex the exception to resolve
* @param env the environment for the invoked {@code DataFetcher}
* @return the resolved errors or {@code null} if unresolved
*/
@Nullable
protected List<GraphQLError> resolveToMultipleErrors(Throwable ex, DataFetchingEnvironment env) {
GraphQLError error = resolveToSingleError(ex, env);
return (error != null ? Collections.singletonList(error) : null);
}
/**
* Override this method to resolve an Exception to a single GraphQL error.
* @param ex the exception to resolve
* @param env the environment for the invoked {@code DataFetcher}
* @return the resolved error or {@code null} if unresolved
*/
@Nullable
protected GraphQLError resolveToSingleError(Throwable ex, DataFetchingEnvironment env) {
return null;
}
/**
* Factory method to create a {@link DataFetcherExceptionResolverAdapter} that
* resolves exceptions with the given {@code BiFunction}.
* @param resolver the resolver function to use
* @return the created instance
* @deprecated as of 1.0.1, please use {@link DataFetcherExceptionResolver#forSingleError(BiFunction)}
*/
@Deprecated
public static DataFetcherExceptionResolverAdapter from(
BiFunction<Throwable, DataFetchingEnvironment, GraphQLError> resolver) {
return new DataFetcherExceptionResolverAdapter() {
@Override
protected GraphQLError resolveToSingleError(Throwable ex, DataFetchingEnvironment env) {
return resolver.apply(ex, env);
}
};
}
}
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