hadoop RackNode 源码
haddop RackNode 代码
文件路径：/hadoop-tools/hadoop-rumen/src/main/java/org/apache/hadoop/tools/rumen/RackNode.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.tools.rumen;
import java.util.Set;
/**
* {@link RackNode} represents a rack node in the cluster topology.
*/
public final class RackNode extends Node {
public RackNode(String name, int level) {
// Hack: ensuring rack name starts with "/".
super(name.startsWith("/") ? name : "/" + name, level);
}
@Override
public synchronized boolean addChild(Node child) {
if (!(child instanceof MachineNode)) {
throw new IllegalArgumentException(
"Only MachineNode can be added to RackNode");
}
return super.addChild(child);
}
/**
* Get the machine nodes that belong to the rack.
* @return The machine nodes that belong to the rack.
*/
@SuppressWarnings({ "cast", "unchecked" })
public Set<MachineNode> getMachinesInRack() {
return (Set<MachineNode>)(Set)getChildren();
}
}
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