spring-graphql CachingDocumentSource 源码
spring-graphql CachingDocumentSource 代码
文件路径：/spring-graphql/src/main/java/org/springframework/graphql/support/CachingDocumentSource.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.support;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import reactor.core.publisher.Mono;
/**
* Base class for {@link DocumentSource} implementations providing support for
* caching loaded documents.
*
* @author Rossen Stoyanchev
* @since 1.0.0
*/
public class CachingDocumentSource implements DocumentSource {
private final DocumentSource delegate;
private boolean cacheEnabled = true;
private final Map<String, Mono<String>> documentCache = new ConcurrentHashMap<>();
/**
* Constructor with the {@code DocumentSource} to actually load documents.
*/
public CachingDocumentSource(DocumentSource delegate) {
this.delegate = delegate;
}
/**
* Enable or disable caching of resolved documents.
* <p>By default, set to {@code true}.
* @param cacheEnabled enable if {@code true} and disable if {@code false}
*/
public void setCacheEnabled(boolean cacheEnabled) {
this.cacheEnabled = cacheEnabled;
if (!cacheEnabled) {
this.documentCache.clear();
}
}
/**
* Whether {@link #setCacheEnabled(boolean) caching} is enabled.
*/
public boolean isCacheEnabled() {
return cacheEnabled;
}
@Override
public Mono<String> getDocument(String name) {
return (isCacheEnabled() ?
this.documentCache.computeIfAbsent(name, k -> this.delegate.getDocument(name).cache()) :
this.delegate.getDocument(name));
}
/**
* Remove all entries from the document cache.
*/
public void clearCache() {
this.documentCache.clear();
}
}
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