hadoop InnerNodeImpl 源码
haddop InnerNodeImpl 代码
文件路径:/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/InnerNodeImpl.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.net;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/** InnerNode represents a switch/router of a data center or rack.
* Different from a leaf node, it has non-null children.
*/
public class InnerNodeImpl extends NodeBase implements InnerNode {
protected static class Factory implements InnerNode.Factory<InnerNodeImpl> {
protected Factory() {}
@Override
public InnerNodeImpl newInnerNode(String path) {
return new InnerNodeImpl(path);
}
}
static final Factory FACTORY = new Factory();
protected final List<Node> children = new ArrayList<>();
protected final Map<String, Node> childrenMap = new HashMap<>();
protected int numOfLeaves;
/**
* Construct an InnerNode from a path-like string.
* @param path input path.
*/
protected InnerNodeImpl(String path) {
super(path);
}
/**
* Construct an InnerNode
* from its name, its network location, its parent, and its level.
* @param name input name.
* @param location input location.
* @param parent input parent.
* @param level input level.
*/
protected InnerNodeImpl(String name, String location,
InnerNode parent, int level) {
super(name, location, parent, level);
}
@Override
public List<Node> getChildren() {
return children;
}
/** @return the number of children this node has. */
@Override
public int getNumOfChildren() {
return children.size();
}
/** Judge if this node represents a rack.
* @return true if it has no child or its children are not InnerNodes
*/
public boolean isRack() {
if (children.isEmpty()) {
return true;
}
Node firstChild = children.get(0);
if (firstChild instanceof InnerNode) {
return false;
}
return true;
}
/** Judge if this node is an ancestor of node <i>n</i>.
*
* @param n a node
* @return true if this node is an ancestor of <i>n</i>
*/
public boolean isAncestor(Node n) {
return getPath(this).equals(NodeBase.PATH_SEPARATOR_STR) ||
(n.getNetworkLocation()+NodeBase.PATH_SEPARATOR_STR).
startsWith(getPath(this)+NodeBase.PATH_SEPARATOR_STR);
}
/** Judge if this node is the parent of node <i>n</i>.
*
* @param n a node
* @return true if this node is the parent of <i>n</i>
*/
public boolean isParent(Node n) {
return n.getNetworkLocation().equals(getPath(this));
}
/* Return a child name of this node who is an ancestor of node <i>n</i> */
public String getNextAncestorName(Node n) {
if (!isAncestor(n)) {
throw new IllegalArgumentException(
this + "is not an ancestor of " + n);
}
String name = n.getNetworkLocation().substring(getPath(this).length());
if (name.charAt(0) == PATH_SEPARATOR) {
name = name.substring(1);
}
int index=name.indexOf(PATH_SEPARATOR);
if (index != -1) {
name = name.substring(0, index);
}
return name;
}
@Override
public boolean add(Node n) {
if (!isAncestor(n)) {
throw new IllegalArgumentException(n.getName()
+ ", which is located at " + n.getNetworkLocation()
+ ", is not a descendant of " + getPath(this));
}
if (isParent(n)) {
// this node is the parent of n; add n directly
n.setParent(this);
n.setLevel(this.level+1);
Node prev = childrenMap.put(n.getName(), n);
if (prev != null) {
for(int i=0; i<children.size(); i++) {
if (children.get(i).getName().equals(n.getName())) {
children.set(i, n);
return false;
}
}
}
children.add(n);
numOfLeaves++;
return true;
} else {
// find the next ancestor node
String parentName = getNextAncestorName(n);
InnerNode parentNode = (InnerNode)childrenMap.get(parentName);
if (parentNode == null) {
// create a new InnerNode
parentNode = createParentNode(parentName);
children.add(parentNode);
childrenMap.put(parentNode.getName(), parentNode);
}
// add n to the subtree of the next ancestor node
if (parentNode.add(n)) {
numOfLeaves++;
return true;
} else {
return false;
}
}
}
/**
* Creates a parent node to be added to the list of children.
* Creates a node using the InnerNode four argument constructor specifying
* the name, location, parent, and level of this node.
*
* <p>To be overridden in subclasses for specific InnerNode implementations,
* as alternative to overriding the full {@link #add(Node)} method.
*
* @param parentName The name of the parent node
* @return A new inner node
* @see InnerNodeImpl(String, String, InnerNode, int)
*/
private InnerNodeImpl createParentNode(String parentName) {
return new InnerNodeImpl(parentName,
getPath(this), this, this.getLevel() + 1);
}
@Override
public boolean remove(Node n) {
if (!isAncestor(n)) {
throw new IllegalArgumentException(n.getName()
+ ", which is located at " + n.getNetworkLocation()
+ ", is not a descendant of " + getPath(this));
}
if (isParent(n)) {
// this node is the parent of n; remove n directly
if (childrenMap.containsKey(n.getName())) {
for (int i=0; i<children.size(); i++) {
if (children.get(i).getName().equals(n.getName())) {
children.remove(i);
childrenMap.remove(n.getName());
numOfLeaves--;
n.setParent(null);
return true;
}
}
}
return false;
} else {
// find the next ancestor node: the parent node
String parentName = getNextAncestorName(n);
InnerNodeImpl parentNode = (InnerNodeImpl)childrenMap.get(parentName);
if (parentNode == null) {
return false;
}
// remove n from the parent node
boolean isRemoved = parentNode.remove(n);
// if the parent node has no children, remove the parent node too
if (isRemoved) {
if (parentNode.getNumOfChildren() == 0) {
for(int i=0; i < children.size(); i++) {
if (children.get(i).getName().equals(parentName)) {
children.remove(i);
childrenMap.remove(parentName);
break;
}
}
}
numOfLeaves--;
}
return isRemoved;
}
} // end of remove
@Override
public Node getLoc(String loc) {
if (loc == null || loc.length() == 0) {
return this;
}
String[] path = loc.split(PATH_SEPARATOR_STR, 2);
Node childNode = childrenMap.get(path[0]);
if (childNode == null || path.length == 1) {
return childNode;
} else if (childNode instanceof InnerNode) {
return ((InnerNode)childNode).getLoc(path[1]);
} else {
return null;
}
}
@Override
public Node getLeaf(int leafIndex, Node excludedNode) {
int count=0;
// check if the excluded node a leaf
boolean isLeaf = !(excludedNode instanceof InnerNode);
// calculate the total number of excluded leaf nodes
int numOfExcludedLeaves =
isLeaf ? 1 : ((InnerNode)excludedNode).getNumOfLeaves();
if (isLeafParent()) { // children are leaves
if (isLeaf) { // excluded node is a leaf node
if (excludedNode != null &&
childrenMap.containsKey(excludedNode.getName())) {
int excludedIndex = children.indexOf(excludedNode);
if (excludedIndex != -1 && leafIndex >= 0) {
// excluded node is one of the children so adjust the leaf index
leafIndex = leafIndex>=excludedIndex ? leafIndex+1 : leafIndex;
}
}
}
// range check
if (leafIndex<0 || leafIndex>=this.getNumOfChildren()) {
return null;
}
return children.get(leafIndex);
} else {
for(int i=0; i<children.size(); i++) {
InnerNodeImpl child = (InnerNodeImpl)children.get(i);
if (excludedNode == null || excludedNode != child) {
// not the excludedNode
int numOfLeaves = child.getNumOfLeaves();
if (excludedNode != null && child.isAncestor(excludedNode)) {
numOfLeaves -= numOfExcludedLeaves;
}
if (count+numOfLeaves > leafIndex) {
// the leaf is in the child subtree
return child.getLeaf(leafIndex-count, excludedNode);
} else {
// go to the next child
count = count+numOfLeaves;
}
} else { // it is the excluededNode
// skip it and set the excludedNode to be null
excludedNode = null;
}
}
return null;
}
}
private boolean isLeafParent() {
return isRack();
}
@Override
public int getNumOfLeaves() {
return numOfLeaves;
}
@Override
public int hashCode() {
return super.hashCode();
}
@Override
public boolean equals(Object to) {
return super.equals(to);
}
}
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