hadoop RemoteParam 源码
haddop RemoteParam 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RemoteParam.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.hadoop.hdfs.server.federation.router;
import java.util.Map;
/**
* A dynamically assignable parameter that is location-specific.
* <p>
* There are 2 ways this mapping is determined:
* <ul>
* <li>Default: Uses the RemoteLocationContext's destination
* <li>Map: Uses the value of the RemoteLocationContext key provided in the
* parameter map.
* </ul>
*/
public class RemoteParam {
private final Map<? extends Object, ? extends Object> paramMap;
/**
* Constructs a default remote parameter. Always maps the value to the
* destination of the provided RemoveLocationContext.
*/
public RemoteParam() {
this.paramMap = null;
}
/**
* Constructs a map based remote parameter. Determines the value using the
* provided RemoteLocationContext as a key into the map.
*
* @param map Map with RemoteLocationContext keys.
*/
public RemoteParam(
Map<? extends RemoteLocationContext, ? extends Object> map) {
this.paramMap = map;
}
/**
* Determine the appropriate value for this parameter based on the location.
*
* @param context Context identifying the location.
* @return A parameter specific to this location.
*/
public Object getParameterForContext(RemoteLocationContext context) {
if (context == null) {
return null;
} else if (this.paramMap != null) {
return this.paramMap.get(context);
} else {
// Default case
return context.getDest();
}
}
@Override
public String toString() {
return new StringBuilder()
.append("RemoteParam(")
.append(this.paramMap)
.append(")")
.toString();
}
}
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