spring CachingResourceTransformer 源码
spring CachingResourceTransformer 代码
文件路径：/spring-webflux/src/main/java/org/springframework/web/reactive/resource/CachingResourceTransformer.java
/*
* Copyright 2002-2019 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.web.reactive.resource;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import reactor.core.publisher.Mono;
import org.springframework.cache.Cache;
import org.springframework.cache.CacheManager;
import org.springframework.core.io.Resource;
import org.springframework.util.Assert;
import org.springframework.web.server.ServerWebExchange;
/**
* A {@link ResourceTransformer} that checks a {@link Cache} to see if a
* previously transformed resource exists in the cache and returns it if found,
* or otherwise delegates to the resolver chain and caches the result.
*
* @author Rossen Stoyanchev
* @since 5.0
*/
public class CachingResourceTransformer implements ResourceTransformer {
private static final Log logger = LogFactory.getLog(CachingResourceTransformer.class);
private final Cache cache;
public CachingResourceTransformer(Cache cache) {
Assert.notNull(cache, "Cache is required");
this.cache = cache;
}
public CachingResourceTransformer(CacheManager cacheManager, String cacheName) {
Cache cache = cacheManager.getCache(cacheName);
if (cache == null) {
throw new IllegalArgumentException("Cache '" + cacheName + "' not found");
}
this.cache = cache;
}
/**
* Return the configured {@code Cache}.
*/
public Cache getCache() {
return this.cache;
}
@Override
public Mono<Resource> transform(ServerWebExchange exchange, Resource resource,
ResourceTransformerChain transformerChain) {
Resource cachedResource = this.cache.get(resource, Resource.class);
if (cachedResource != null) {
if (logger.isTraceEnabled()) {
logger.trace(exchange.getLogPrefix() + "Resource resolved from cache");
}
return Mono.just(cachedResource);
}
return transformerChain.transform(exchange, resource)
.doOnNext(transformed -> this.cache.put(resource, transformed));
}
}
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