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

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

All Implemented Interfaces:

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

Direct Known Subclasses:

LazyReplicatedMap, ReplicatedMap

public abstract class AbstractReplicatedMap<K,V>
extends java.lang.Object
implements java.util.Map<K,V>, java.io.Serializable, RpcCallback, ChannelListener, MembershipListener, Heartbeat

Version:

1.0

See Also:

Serialized Form

DEFAULT_INITIAL_CAPACITY

public static final int DEFAULT_INITIAL_CAPACITY

The default initial capacity - MUST be a power of two.

See Also:

Constant Field Values

DEFAULT_LOAD_FACTOR

public static final float DEFAULT_LOAD_FACTOR

The load factor used when none specified in constructor.

See Also:

Constant Field Values

rpcTimeout

protected transient long rpcTimeout

Timeout for RPC messages, how long we will wait for a reply

channel

protected transient Channel channel

Reference to the channel for sending messages

rpcChannel

protected transient RpcChannel rpcChannel

The RpcChannel to send RPC messages through

mapContextName

protected transient byte[] mapContextName

The Map context name makes this map unique, this allows us to have more than one map shared through one channel

stateTransferred

protected transient boolean stateTransferred

Has the state been transferred

stateMutex

protected final transient java.lang.Object stateMutex

Simple lock object for transfers

mapMembers

protected final transient java.util.HashMap<Member,java.lang.Long> mapMembers

A list of members in our map

channelSendOptions

protected transient int channelSendOptions

Our default send options

mapOwner

protected transient AbstractReplicatedMap.MapOwner mapOwner

The owner of this map, ala a SessionManager for example

externalLoaders

protected transient java.lang.ClassLoader[] externalLoaders

External class loaders if serialization and deserialization is to be performed successfully.

currentNode

protected transient int currentNode

The node we are currently backing up data to, this index will rotate on a round robin basis

accessTimeout

protected transient long accessTimeout

Since the map keeps internal membership this is the timeout for a ping message to be responded to If a remote map doesn't respond within this timeframe, its considered dead.

mapname

protected transient java.lang.String mapname

Readable string of the mapContextName value

AbstractReplicatedMap

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

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

cls - - a list of classloaders to be used for deserialization of objects.

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

getStateMessageType

protected abstract int getStateMessageType()

wrap

protected Member[] wrap(Member m)

Helper methods, wraps a single member in an array

Parameters:

m - Member

Returns:

Member[]

init

protected void init(AbstractReplicatedMap.MapOwner owner,
                    Channel channel,
                    java.lang.String mapContextName,
                    long timeout,
                    int channelSendOptions,
                    java.lang.ClassLoader[] cls,
                    boolean terminate)

Initializes the map by creating the RPC channel, registering itself as a channel listener This method is also responsible for initiating the state transfer

Parameters:

owner - Object

channel - Channel

mapContextName - String

timeout - long

channelSendOptions - int

cls - ClassLoader[]

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

ping

protected void ping(long timeout)
             throws ChannelException

Sends a ping out to all the members in the cluster, not just map members that this map is alive.

Parameters:

timeout - long

Throws:

ChannelException

memberAlive

protected void memberAlive(Member member)

We have received a member alive notification

Parameters:

member - Member

broadcast

protected void broadcast(int msgtype,
                         boolean rpc)
                  throws ChannelException

Helper method to broadcast a message to all members in a channel

Parameters:

msgtype - int

rpc - boolean

Throws:

ChannelException

breakdown

public void breakdown()

finalize

public void finalize()

Overrides:

finalize in class java.lang.Object

hashCode

public int hashCode()

Specified by:

hashCode in interface java.util.Map<K,V>

Specified by:

hashCode in interface ChannelListener

Overrides:

hashCode in class java.lang.Object

Returns:

int

See Also:

Object.hashCode()

equals

public boolean equals(java.lang.Object o)

Specified by:

equals in interface java.util.Map<K,V>

Specified by:

equals in interface ChannelListener

Overrides:

equals in class java.lang.Object

Parameters:

o - Object

Returns:

boolean

See Also:

Object.equals(Object)

getMapMembers

public Member[] getMapMembers(java.util.HashMap<Member,java.lang.Long> members)

getMapMembers

public Member[] getMapMembers()

getMapMembersExcl

public Member[] getMapMembersExcl(Member[] exclude)

replicate

public void replicate(java.lang.Object key,
                      boolean complete)

Replicates any changes to the object since the last time The object has to be primary, ie, if the object is a proxy or a backup, it will not be replicated

Parameters:

complete - - if set to true, the object is replicated to its backup if set to false, only objects that implement ReplicatedMapEntry and the isDirty() returns true will be replicated

replicate

public void replicate(boolean complete)

This can be invoked by a periodic thread to replicate out any changes. For maps that don't store objects that implement ReplicatedMapEntry, this method should be used infrequently to avoid large amounts of data transfer

Parameters:

complete - boolean

transferState

public void transferState()

replyRequest

public java.io.Serializable replyRequest(java.io.Serializable msg,
                                         Member sender)

TODO implement state transfer

Specified by:

replyRequest in interface RpcCallback

Parameters:

msg - Serializable

Returns:

Serializable - null if no reply should be sent

leftOver

public void leftOver(java.io.Serializable msg,
                     Member sender)

If the reply has already been sent to the requesting thread, the rpc callback can handle any data that comes in after the fact.

Specified by:

leftOver in interface RpcCallback

Parameters:

msg - Serializable

sender - Member

messageReceived

public void messageReceived(java.io.Serializable msg,
                            Member sender)

Description copied from interface: ChannelListener

Receive a message from the channel

Specified by:

messageReceived in interface ChannelListener

Parameters:

msg - Serializable

sender - - the source of the message

accept

public boolean accept(java.io.Serializable msg,
                      Member sender)

Description copied from interface: ChannelListener

Invoked by the channel to determine if the listener will process this message or not.

Specified by:

accept in interface ChannelListener

Parameters:

msg - Serializable

sender - Member

Returns:

boolean

mapMemberAdded

public void mapMemberAdded(Member member)

inSet

public boolean inSet(Member m,
                     Member[] set)

excludeFromSet

public Member[] excludeFromSet(Member[] mbrs,
                               Member[] set)

memberAdded

public void memberAdded(Member member)

Description copied from interface: MembershipListener

A member was added to the group

Specified by:

memberAdded in interface MembershipListener

Parameters:

member - Member - the member that was added

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

Parameters:

member - Member

See Also:

Member.SHUTDOWN_PAYLOAD

getNextBackupIndex

public int getNextBackupIndex()

getNextBackupNode

public Member getNextBackupNode()

publishEntryInfo

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

Throws:

ChannelException

heartbeat

public void heartbeat()

Description copied from interface: Heartbeat

Heartbeat invokation for resources cleanup etc

Specified by:

heartbeat in interface Heartbeat

remove

public V remove(java.lang.Object key)

Removes an object from this map, it will also remove it from

Specified by:

remove in interface java.util.Map<K,V>

Parameters:

key - Object

Returns:

Object

remove

public V remove(java.lang.Object key,
                boolean notify)

getInternal

public AbstractReplicatedMap.MapEntry<K,V> getInternal(java.lang.Object key)

get

public V get(java.lang.Object key)

Specified by:

get in interface java.util.Map<K,V>

printMap

protected void printMap(java.lang.String header)

containsKey

public boolean containsKey(java.lang.Object key)

Returns true if the key has an entry in the map. The entry can be a proxy or a backup entry, invoking get(key) will make this entry primary for the group

Specified by:

containsKey in interface java.util.Map<K,V>

Parameters:

key - Object

Returns:

boolean

put

public V put(K key,
             V value)

Specified by:

put in interface java.util.Map<K,V>

put

public V put(K key,
             V value,
             boolean notify)

putAll

public void putAll(java.util.Map<? extends K,? extends V> m)

Copies all values from one map to this instance

Specified by:

putAll in interface java.util.Map<K,V>

Parameters:

m - Map

clear

public void clear()

Specified by:

clear in interface java.util.Map<K,V>

clear

public void clear(boolean notify)

containsValue

public boolean containsValue(java.lang.Object value)

Specified by:

containsValue in interface java.util.Map<K,V>

clone

public java.lang.Object clone()

Overrides:

clone in class java.lang.Object

entrySetFull

public java.util.Set<java.util.Map.Entry<K,AbstractReplicatedMap.MapEntry<K,V>>> entrySetFull()

Returns the entire contents of the map Map.Entry.getValue() will return a LazyReplicatedMap.MapEntry object containing all the information about the object.

Returns:

Set

keySetFull

public java.util.Set<K> keySetFull()

sizeFull

public int sizeFull()

entrySet

public java.util.Set<java.util.Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface java.util.Map<K,V>

keySet

public java.util.Set<K> keySet()

Specified by:

keySet in interface java.util.Map<K,V>

size

public int size()

Specified by:

size in interface java.util.Map<K,V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Map<K,V>

values

public java.util.Collection<V> values()

Specified by:

values in interface java.util.Map<K,V>

getChannel

public Channel getChannel()

getMapContextName

public byte[] getMapContextName()

getRpcChannel

public RpcChannel getRpcChannel()

getRpcTimeout

public long getRpcTimeout()

getStateMutex

public java.lang.Object getStateMutex()

isStateTransferred

public boolean isStateTransferred()

getMapOwner

public AbstractReplicatedMap.MapOwner getMapOwner()

getExternalLoaders

public java.lang.ClassLoader[] getExternalLoaders()

getChannelSendOptions

public int getChannelSendOptions()

getAccessTimeout

public long getAccessTimeout()

setMapOwner

public void setMapOwner(AbstractReplicatedMap.MapOwner mapOwner)

setExternalLoaders

public void setExternalLoaders(java.lang.ClassLoader[] externalLoaders)

setChannelSendOptions

public void setChannelSendOptions(int channelSendOptions)

setAccessTimeout

public void setAccessTimeout(long accessTimeout)