org.apache.catalina.tribes.tipis

Class ReplicatedMap<K,V>

java.lang.Object

org.apache.catalina.tribes.tipis.AbstractReplicatedMap<K,V>

org.apache.catalina.tribes.tipis.ReplicatedMap<K,V>

All Implemented Interfaces:

java.io.Serializable, java.util.Map<K,V>, ChannelListener, RpcCallback, Heartbeat, MembershipListener

public class ReplicatedMap<K,V>
extends AbstractReplicatedMap<K,V>

All-to-all replication for a hash map implementation. Each node in the cluster will carry an identical copy of the map.

This map implementation doesn't have a background thread running to replicate changes. If you do have changes without invoking put/remove then you need to invoke one of the following methods:

• replicate(Object,boolean) - replicates only the object that belongs to the key
• replicate(boolean) - Scans the entire map for changes and replicates data

the boolean value in the replicate method used to decide whether to only replicate objects that implement the ReplicatedMapEntry interface or to replicate all objects. If an object doesn't implement the ReplicatedMapEntry interface each time the object gets replicated the entire object gets serialized, hence a call to replicate(true) will replicate all objects in this map that are using this node as primary.

REMBER TO CALL breakdown() or finalize() when you are done with the map to avoid memory leaks.

TODO implement periodic sync/transfer thread

Version:

1.0 TODO memberDisappeared, should do nothing except change map membership by default it relocates the primary objects

Author:

Filip Hanik

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.catalina.tribes.tipis.AbstractReplicatedMap

AbstractReplicatedMap.MapEntry<K,V>, AbstractReplicatedMap.MapMessage, AbstractReplicatedMap.MapOwner

Nested classes/interfaces inherited from interface java.util.Map

java.util.Map.Entry<K,V>

Field Summary

Fields inherited from class org.apache.catalina.tribes.tipis.AbstractReplicatedMap

accessTimeout, channel, channelSendOptions, currentNode, DEFAULT_INITIAL_CAPACITY, DEFAULT_LOAD_FACTOR, externalLoaders, mapContextName, mapMembers, mapname, mapOwner, rpcChannel, rpcTimeout, stateMutex, stateTransferred

Constructor Summary

Constructors

Constructor and Description
ReplicatedMap(AbstractReplicatedMap.MapOwner owner, Channel channel, long timeout, java.lang.String mapContextName, java.lang.ClassLoader[] cls) Creates a new map
ReplicatedMap(AbstractReplicatedMap.MapOwner owner, Channel channel, long timeout, java.lang.String mapContextName, int initialCapacity, java.lang.ClassLoader[] cls) Creates a new map
ReplicatedMap(AbstractReplicatedMap.MapOwner owner, Channel channel, long timeout, java.lang.String mapContextName, int initialCapacity, float loadFactor, java.lang.ClassLoader[] cls) Creates a new map

Method Summary

Modifier and Type	Method and Description
protected int	getStateMessageType()
protected Member[]	publishEntryInfo(java.lang.Object key, java.lang.Object value) publish info about a map pair (key/value) to other nodes in the cluster

Methods inherited from class org.apache.catalina.tribes.tipis.AbstractReplicatedMap

accept, breakdown, broadcast, clear, clear, clone, containsKey, containsValue, entrySet, entrySetFull, equals, excludeFromSet, finalize, get, getAccessTimeout, getChannel, getChannelSendOptions, getExternalLoaders, getInternal, getMapContextName, getMapMembers, getMapMembers, getMapMembersExcl, getMapOwner, getNextBackupIndex, getNextBackupNode, getRpcChannel, getRpcTimeout, getStateMutex, hashCode, heartbeat, init, inSet, isEmpty, isStateTransferred, keySet, keySetFull, leftOver, mapMemberAdded, memberAdded, memberAlive, memberDisappeared, messageReceived, ping, printMap, put, put, putAll, remove, remove, replicate, replicate, replyRequest, setAccessTimeout, setChannelSendOptions, setExternalLoaders, setMapOwner, size, sizeFull, transferState, values, wrap

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Constructor Detail

ReplicatedMap

public ReplicatedMap(AbstractReplicatedMap.MapOwner owner,
                     Channel channel,
                     long timeout,
                     java.lang.String mapContextName,
                     int initialCapacity,
                     float loadFactor,
                     java.lang.ClassLoader[] cls)

Creates a new map

Parameters:

channel - The channel to use for communication

timeout - long - timeout for RPC messags

mapContextName - String - unique name for this map, to allow multiple maps per channel

initialCapacity - int - the size of this map, see HashMap

loadFactor - float - load factor, see HashMap

ReplicatedMap

public ReplicatedMap(AbstractReplicatedMap.MapOwner owner,
                     Channel channel,
                     long timeout,
                     java.lang.String mapContextName,
                     int initialCapacity,
                     java.lang.ClassLoader[] cls)

Creates a new map

Parameters:

channel - The channel to use for communication

timeout - long - timeout for RPC messags

mapContextName - String - unique name for this map, to allow multiple maps per channel

initialCapacity - int - the size of this map, see HashMap

ReplicatedMap

public ReplicatedMap(AbstractReplicatedMap.MapOwner owner,
                     Channel channel,
                     long timeout,
                     java.lang.String mapContextName,
                     java.lang.ClassLoader[] cls)

Creates a new map

Parameters:

channel - The channel to use for communication

timeout - long - timeout for RPC messags

mapContextName - String - unique name for this map, to allow multiple maps per channel

Method Detail

getStateMessageType

protected int getStateMessageType()

Specified by:

getStateMessageType in class AbstractReplicatedMap<K,V>

publishEntryInfo

protected Member[] publishEntryInfo(java.lang.Object key,
                                    java.lang.Object value)
                             throws ChannelException

publish info about a map pair (key/value) to other nodes in the cluster

Specified by:

publishEntryInfo in class AbstractReplicatedMap<K,V>

Parameters:

key - Object

value - Object

Returns:

Member - the backup node

Throws:

ChannelException