dubbo AttachmentsAdapter 源码
dubbo AttachmentsAdapter 代码
文件路径：/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/AttachmentsAdapter.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.rpc;
import java.util.HashMap;
import java.util.Map;
/**
* This class provides map adapters to support attachments in RpcContext, Invocation and Result switch from
* <String, String> to <String, Object>
*/
public class AttachmentsAdapter {
public static class ObjectToStringMap extends HashMap<String, String> {
private Map<String, Object> attachments;
public ObjectToStringMap(Map<String, Object> attachments) {
for (Entry<String, Object> entry : attachments.entrySet()) {
String convertResult = convert(entry.getValue());
if (convertResult != null) {
super.put(entry.getKey(), convertResult);
}
}
this.attachments = attachments;
}
@Override
public String put(String key, String value) {
attachments.put(key, value);
return super.put(key, value);
}
@Override
public String remove(Object key) {
attachments.remove(key);
return super.remove(key);
}
private String convert(Object obj) {
if (obj instanceof String) {
return (String) obj;
}
return null; // or JSON.toString(obj);
}
@Override
public void clear() {
attachments.clear();
super.clear();
}
@Override
public void putAll(Map<? extends String, ? extends String> map) {
attachments.putAll(map);
super.putAll(map);
}
}
}
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