/**
* 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.net;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/** The interface defines a node in a network topology.
* A node may be a leave representing a data node or an inner
* node representing a datacenter or rack.
* Each data has a name and its location in the network is
* decided by a string with syntax similar to a file name.
* For example, a data node's name is hostname:port# and if it's located at
* rack "orange" in datacenter "dog", the string representation of its
* network location is /dog/orange
*/
@InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"})
@InterfaceStability.Unstable
public interface Node {
/** @return the string representation of this node's network location */
public String getNetworkLocation();
/** Set this node's network location
* @param location the location
*/
public void setNetworkLocation(String location);
/** @return this node's name */
public String getName();
/** @return this node's parent */
public Node getParent();
/** Set this node's parent
* @param parent the parent
*/
public void setParent(Node parent);
/** @return this node's level in the tree.
* E.g. the root of a tree returns 0 and its children return 1
*/
public int getLevel();
/** Set this node's level in the tree
* @param i the level
*/
public void setLevel(int i);
}