Package 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>

Type Parameters:

K - The type of Key

V - The type of Value

All Implemented Interfaces:

Serializable, 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.

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

TODO implement periodic sync/transfer thread
TODO memberDisappeared, should do nothing except change map membership by default it relocates the primary objects

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

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, innerMap, mapContextName, mapMembers, mapname, mapOwner, rpcChannel, rpcTimeout, sm, stateMutex, stateTransferred

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
protected int	getReplicateMessageType()
protected int	getStateMessageType()
void	mapMemberAdded(Member member)
void	memberDisappeared(Member member)	A member was removed from the group If the member left voluntarily, the Member.getCommand will contain the Member.SHUTDOWN_PAYLOAD data
protected Member[]	publishEntryInfo(Object key, 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, containsKey, containsValue, entrySet, entrySetFull, equals, excludeFromSet, 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, memberAdded, memberAlive, 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

clone, finalize, 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 Details

ReplicatedMap

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

Creates a new map

Parameters:

owner - The map owner

channel - The channel to use for communication

timeout - long - timeout for RPC messages

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

cls - Class loaders

ReplicatedMap

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

Creates a new map

Parameters:

owner - The map owner

channel - The channel to use for communication

timeout - long - timeout for RPC messages

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

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

cls - Class loaders

ReplicatedMap

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

Creates a new map

Parameters:

owner - The map owner

channel - The channel to use for communication

timeout - long - timeout for RPC messages

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

cls - Class loaders

ReplicatedMap

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

Creates a new map

Parameters:

owner - The map owner

channel - The channel to use for communication

timeout - long - timeout for RPC messages

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

cls - Class loaders

terminate - boolean - Flag for whether to terminate this map that failed to start.

Method Details

getStateMessageType

protected int getStateMessageType()

Specified by:

getStateMessageType in class AbstractReplicatedMap<K,V>

getReplicateMessageType

protected int getReplicateMessageType()

Specified by:

getReplicateMessageType in class AbstractReplicatedMap<K,V>

publishEntryInfo

protected Member[] publishEntryInfo(Object key,
 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 - Cluster error

memberDisappeared

public void memberDisappeared(Member member)

Description copied from interface: MembershipListener

A member was removed from the group
If the member left voluntarily, the Member.getCommand will contain the Member.SHUTDOWN_PAYLOAD data

Specified by:

memberDisappeared in interface MembershipListener

Overrides:

memberDisappeared in class AbstractReplicatedMap<K,V>

Parameters:

member - Member

See Also:

• Member.SHUTDOWN_PAYLOAD

mapMemberAdded

public void mapMemberAdded(Member member)

Overrides:

mapMemberAdded in class AbstractReplicatedMap<K,V>