dubbo ConfigurationCache 源码
dubbo ConfigurationCache 代码
文件路径：/dubbo-common/src/main/java/org/apache/dubbo/common/config/ConfigurationCache.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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
*
* http://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.apache.dubbo.common.config;
import org.apache.dubbo.rpc.model.ScopeModel;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
/**
* Properties Cache of Configuration {@link ConfigurationUtils#getCachedDynamicProperty(ScopeModel, String, String)}
*/
public class ConfigurationCache {
private final Map<String, String> cache = new ConcurrentHashMap<>();
/**
* Get Cached Value
*
* @param key key
* @param function function to produce value, should not return `null`
* @return value
*/
public String computeIfAbsent(String key, Function<String, String> function) {
String value = cache.get(key);
// value might be empty here!
// empty value from config center will be cached here
if (value == null) {
// lock free, tolerate repeat apply, will return previous value
cache.putIfAbsent(key, function.apply(key));
value = cache.get(key);
}
return value;
}
}
相关信息
相关文章
dubbo CompositeConfiguration 源码
dubbo EnvironmentConfiguration 源码
dubbo InmemoryConfiguration 源码
dubbo OrderedPropertiesConfiguration 源码
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
8、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦