Package org.apache.zookeeper.server

Class NodeHashMapImpl

java.lang.Object

org.apache.zookeeper.server.NodeHashMapImpl

All Implemented Interfaces:

NodeHashMap

public class NodeHashMapImpl
extends Object
implements NodeHashMap

a simple wrapper to ConcurrentHashMap that recalculates a digest after each mutation.

Constructor Summary

Constructors

Constructor	Description
NodeHashMapImpl(DigestCalculator digestCalculator)

Method Summary

Modifier and Type	Method	Description
void	clear()	Clear all the items stored inside this map.
Set<Map.Entry<String,DataNode>>	entrySet()	Return all the entries inside this map.
DataNode	get(String path)	Return the data node associated with the path.
long	getDigest()	Return the digest value.
void	postChange(String path, DataNode node)	Called after making the changes on the node, which will update the digest.
void	preChange(String path, DataNode node)	Called before we made the change on the node, which will clear the digest associated with it.
DataNode	put(String path, DataNode node)	Add the node into the map and update the digest with the new node.
DataNode	putWithoutDigest(String path, DataNode node)	Add the node into the map without update the digest.
DataNode	remove(String path)	Remove the path from the internal nodes map.
int	size()	Return the size of the nodes stored in this map.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NodeHashMapImpl

public NodeHashMapImpl(DigestCalculator digestCalculator)

Method Detail

put

public DataNode put(String path,
                    DataNode node)

Description copied from interface: NodeHashMap

Add the node into the map and update the digest with the new node.

Specified by:

put in interface NodeHashMap

Parameters:

path - the path of the node

node - the actual node associated with this path

putWithoutDigest

public DataNode putWithoutDigest(String path,
                                 DataNode node)

Description copied from interface: NodeHashMap

Add the node into the map without update the digest.

Specified by:

putWithoutDigest in interface NodeHashMap

Parameters:

path - the path of the node

node - the actual node associated with this path

get

public DataNode get(String path)

Description copied from interface: NodeHashMap

Return the data node associated with the path.

Specified by:

get in interface NodeHashMap

Parameters:

path - the path to read from

remove

public DataNode remove(String path)

Description copied from interface: NodeHashMap

Remove the path from the internal nodes map.

Specified by:

remove in interface NodeHashMap

Parameters:

path - the path to remove

Returns:

the node being removed

entrySet

public Set<Map.Entry<String,DataNode>> entrySet()

Description copied from interface: NodeHashMap

Return all the entries inside this map.

Specified by:

entrySet in interface NodeHashMap

clear

public void clear()

Description copied from interface: NodeHashMap

Clear all the items stored inside this map.

Specified by:

clear in interface NodeHashMap

size

public int size()

Description copied from interface: NodeHashMap

Return the size of the nodes stored in this map.

Specified by:

size in interface NodeHashMap

preChange

public void preChange(String path,
                      DataNode node)

Description copied from interface: NodeHashMap

Called before we made the change on the node, which will clear the digest associated with it.

Specified by:

preChange in interface NodeHashMap

Parameters:

path - the path being changed

node - the node associated with the path

postChange

public void postChange(String path,
                       DataNode node)

Description copied from interface: NodeHashMap

Called after making the changes on the node, which will update the digest.

Specified by:

postChange in interface NodeHashMap

Parameters:

path - the path being changed

node - the node associated with the path

getDigest

public long getDigest()

Description copied from interface: NodeHashMap

Return the digest value.

Specified by:

getDigest in interface NodeHashMap