org.infinispan.distribution
Class DistributionManagerImpl

java.lang.Object
  org.infinispan.distribution.DistributionManagerImpl

All Implemented Interfaces:

DistributionManager

public class DistributionManagerImpl
extends Object
implements DistributionManager

The default distribution manager implementation

Since:

4.0

Author:

Manik Surtani

Nested Class Summary

class

DistributionManagerImpl.ViewChangeListener

Constructor Summary

DistributionManagerImpl()

Method Summary

void	applyReceivedState(Map<Object,InternalCacheValue> state) Applies a state map received via a RehashControlCommand.
void	applyRemoteTxLog(List<WriteCommand> txLogCommands) Applies an ordered list of modifications to the current node.
void	applyState(ConsistentHash consistentHash, Map<Object,InternalCacheValue> state)
List<Address>	getAffectedNodes(Set<Object> affectedKeys) A helper method that retrieves a list of nodes affected by operations on a set of keys.
CacheStore	getCacheStoreForRehashing() Retrieves a cache store if one is available and set up for use in rehashing.
ConsistentHash	getConsistentHash() Retrieves the consistent hash instance currently in use, which may be an instance of the configured ConsistentHash instance (which defaults to DefaultConsistentHash, or an instance of UnionConsistentHash if a rehash is in progress.
TransactionLogger	getTransactionLogger() Retrieves the transaction logger instance associated with this DistributionManager
void	informRehashOnJoin(Address joiner, boolean starting) This will cause all nodes to add the joiner to their consistent hash instance (usually by creating a UnionConsistentHash
void	init(Configuration configuration, RpcManager rpcManager, CacheManagerNotifier notifier, CommandsFactory cf, DataContainer dataContainer, InterceptorChain interceptorChain, InvocationContextContainer icc, CacheLoaderManager cacheLoaderManager)
boolean	isAffectedByRehash(Object key) Tests whether a given key is affected by a rehash that may be in progress.
boolean	isJoinComplete() Tests whether the current instance has completed joining the cluster
boolean	isLocal(Object key)
boolean	isLocatedLocally(String key)
boolean	isRehashInProgress() Tests whether a rehash is in progress
List<Address>	locate(Object key) Locates a key in a cluster.
Map<Object,List<Address>>	locateAll(Collection<Object> keys) Locates a list of keys in a cluster.
List<String>	locateKey(String key)
void	notifyJoinComplete(Address joiner) Notifies a coordinator when a join completes
void	rehash(List<Address> newMembers, List<Address> oldMembers)
List<Address>	requestPermissionToJoin(Address joiner) "Asks" a coordinator if a joiner may join.
InternalCacheEntry	retrieveFromRemoteSource(Object key) Retrieves a cache entry from a remote source.
void	setConsistentHash(ConsistentHash consistentHash) Sets the consistent hash implementation in use.
void	start()
void	stop()
String	toString()
void	transformForL1(CacheEntry entry) Transforms a cache entry so it is marked for L1 rather than the primary cache data structure.

Methods inherited from class java.lang.Object

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

Constructor Detail

DistributionManagerImpl

public DistributionManagerImpl()

Method Detail

init

public void init(Configuration configuration,
                 RpcManager rpcManager,
                 CacheManagerNotifier notifier,
                 CommandsFactory cf,
                 DataContainer dataContainer,
                 InterceptorChain interceptorChain,
                 InvocationContextContainer icc,
                 CacheLoaderManager cacheLoaderManager)

start

public void start()
           throws Exception

Throws:

Exception

stop

public void stop()

rehash

public void rehash(List<Address> newMembers,
                   List<Address> oldMembers)

isLocal

public boolean isLocal(Object key)

Specified by:

isLocal in interface DistributionManager

locate

public List<Address> locate(Object key)

Description copied from interface: DistributionManager

Locates a key in a cluster. The returned addresses may not be owners of the keys if a rehash happens to be in progress or is pending, so when querying these servers, invalid responses should be checked for and the next address checked accordingly.

Specified by:

locate in interface DistributionManager

Parameters:

key - key to test

Returns:

a list of addresses where the key may reside

locateAll

public Map<Object,List<Address>> locateAll(Collection<Object> keys)

Description copied from interface: DistributionManager

Locates a list of keys in a cluster. Like DistributionManager.locate(Object) the returned addresses may not be owners of the keys if a rehash happens to be in progress or is pending, so when querying these servers, invalid responses should be checked for and the next address checked accordingly.

Specified by:

locateAll in interface DistributionManager

Parameters:

keys - list of keys to test

Returns:

a list of addresses where the key may reside

transformForL1

public void transformForL1(CacheEntry entry)

Description copied from interface: DistributionManager

Transforms a cache entry so it is marked for L1 rather than the primary cache data structure. This should be done if it is deemed that the entry is targeted for L1 storage rather than storage in the primary data container.

Specified by:

transformForL1 in interface DistributionManager

Parameters:

entry - entry to transform

retrieveFromRemoteSource

public InternalCacheEntry retrieveFromRemoteSource(Object key)
                                            throws Exception

Description copied from interface: DistributionManager

Retrieves a cache entry from a remote source. Would typically involve an RPC call using a ClusteredGetCommand and some form of quorum of responses if the responses returned are inconsistent - often the case if there is a rehash in progress, involving nodes that the key maps to.

Specified by:

retrieveFromRemoteSource in interface DistributionManager

Parameters:

key - key to look up

Returns:

an internal cache entry, or null if it cannot be located

Throws:

Exception - if something bad happens

getConsistentHash

public ConsistentHash getConsistentHash()

Description copied from interface: DistributionManager

Retrieves the consistent hash instance currently in use, which may be an instance of the configured ConsistentHash instance (which defaults to DefaultConsistentHash, or an instance of UnionConsistentHash if a rehash is in progress.

Specified by:

getConsistentHash in interface DistributionManager

Returns:

a ConsistentHash instance

setConsistentHash

public void setConsistentHash(ConsistentHash consistentHash)

Description copied from interface: DistributionManager

Sets the consistent hash implementation in use.

Specified by:

setConsistentHash in interface DistributionManager

Parameters:

consistentHash - consistent hash to set to

isAffectedByRehash

public boolean isAffectedByRehash(Object key)

Description copied from interface: DistributionManager

Tests whether a given key is affected by a rehash that may be in progress. If no rehash is in progress, this method returns false. Helps determine whether additional steps are necessary in handling an operation with a given key.

Specified by:

isAffectedByRehash in interface DistributionManager

Parameters:

key - key to test

Returns:

whether a key is affected by a rehash

getTransactionLogger

public TransactionLogger getTransactionLogger()

Description copied from interface: DistributionManager

Retrieves the transaction logger instance associated with this DistributionManager

Specified by:

getTransactionLogger in interface DistributionManager

Returns:

a TransactionLogger

requestPermissionToJoin

public List<Address> requestPermissionToJoin(Address joiner)

Description copied from interface: DistributionManager

"Asks" a coordinator if a joiner may join. Used to serialize joins such that only a single joiner comes in at any given time.

Specified by:

requestPermissionToJoin in interface DistributionManager

Parameters:

joiner - joiner who wants to join

Returns:

a consistent hash prior to the joiner joining (if the joiner is allowed to join), otherwise null.

notifyJoinComplete

public void notifyJoinComplete(Address joiner)

Description copied from interface: DistributionManager

Notifies a coordinator when a join completes

Specified by:

notifyJoinComplete in interface DistributionManager

Parameters:

joiner - joiner who has completed.

informRehashOnJoin

public void informRehashOnJoin(Address joiner,
                               boolean starting)

Description copied from interface: DistributionManager

This will cause all nodes to add the joiner to their consistent hash instance (usually by creating a UnionConsistentHash

Specified by:

informRehashOnJoin in interface DistributionManager

Parameters:

joiner - address of joiner

starting - if true, the joiner is reporting that it is starting the join process. If false, the joiner is reporting that it has completed the join process.

applyState

public void applyState(ConsistentHash consistentHash,
                       Map<Object,InternalCacheValue> state)

getCacheStoreForRehashing

public CacheStore getCacheStoreForRehashing()

Description copied from interface: DistributionManager

Retrieves a cache store if one is available and set up for use in rehashing. May return null!

Specified by:

getCacheStoreForRehashing in interface DistributionManager

Returns:

a cache store is one is available and configured for use in rehashing, or null otherwise.

isRehashInProgress

public boolean isRehashInProgress()

Description copied from interface: DistributionManager

Tests whether a rehash is in progress

Specified by:

isRehashInProgress in interface DistributionManager

Returns:

true if a rehash is in progress, false otherwise

applyReceivedState

public void applyReceivedState(Map<Object,InternalCacheValue> state)

Description copied from interface: DistributionManager

Applies a state map received via a RehashControlCommand. Usually this means state has been pushed to the current node probably due to another node leaving the cluster.

Specified by:

applyReceivedState in interface DistributionManager

Parameters:

state - state to apply

isJoinComplete

public boolean isJoinComplete()

Description copied from interface: DistributionManager

Tests whether the current instance has completed joining the cluster

Specified by:

isJoinComplete in interface DistributionManager

Returns:

true if join is in progress, false otherwise

getAffectedNodes

public List<Address> getAffectedNodes(Set<Object> affectedKeys)

Description copied from interface: DistributionManager

A helper method that retrieves a list of nodes affected by operations on a set of keys. This helper will in turn call DistributionManager.locateAll(java.util.Collection) and then combine the result addresses.

Specified by:

getAffectedNodes in interface DistributionManager

Parameters:

affectedKeys - keys to locate

Returns:

a list of addresses which represent a combined set of all addresses affected by the set of keys.

applyRemoteTxLog

public void applyRemoteTxLog(List<WriteCommand> txLogCommands)

Description copied from interface: DistributionManager

Applies an ordered list of modifications to the current node. Typically used when state is pushed to the node (i.e., anotehr node leaves the cluster) and the transaction log needs to be flushed after pushing state.

Specified by:

applyRemoteTxLog in interface DistributionManager

Parameters:

txLogCommands - ordered list of mods

isLocatedLocally

public boolean isLocatedLocally(String key)

locateKey

public List<String> locateKey(String key)

toString

public String toString()

Overrides:

toString in class Object