com.hazelcast.concurrent.idgen

Class IdGeneratorImpl

java.lang.Object

com.hazelcast.concurrent.idgen.IdGeneratorImpl

All Implemented Interfaces:

DistributedObject, IdGenerator

public class IdGeneratorImpl
extends Object
implements IdGenerator

Generates blocks with the help of an IAtomicLong.

For each block, ID generation is simply a volatile increment.

Field Summary

Fields

Modifier and Type	Field and Description
static int	BLOCK_SIZE

Constructor Summary

Constructors

Constructor and Description
IdGeneratorImpl(IAtomicLong blockGenerator)

Method Summary

Modifier and Type	Method and Description
void	destroy() Destroys this object cluster-wide.
String	getName() Returns the unique name for this DistributedObject.
String	getPartitionKey() Returns the key of the partition that this DistributedObject is assigned to.
String	getServiceName() Returns the service name for this object.
boolean	init(long id) Tries to initialize this IdGenerator instance with the given ID.
long	newId() Generates and returns a cluster-wide unique ID.

Methods inherited from class java.lang.Object

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

Field Detail

BLOCK_SIZE

public static final int BLOCK_SIZE

See Also:

Constant Field Values

Constructor Detail

IdGeneratorImpl

public IdGeneratorImpl(IAtomicLong blockGenerator)

Method Detail

init

public boolean init(long id)

Description copied from interface: IdGenerator

Tries to initialize this IdGenerator instance with the given ID.

The first generated ID will be 1 greater than ID.

Specified by:

init in interface IdGenerator

Returns:

true if initialization succeeded, false if ID is less than 0.

newId

public long newId()

Description copied from interface: IdGenerator

Generates and returns a cluster-wide unique ID.

Generated IDs are guaranteed to be unique for the entire cluster as long as the cluster is live. If the cluster restarts, then ID generation will start from 0.

Specified by:

newId in interface IdGenerator

Returns:

the cluster-wide new unique ID

getPartitionKey

public String getPartitionKey()

Description copied from interface: DistributedObject

Returns the key of the partition that this DistributedObject is assigned to. The returned value only has meaning for a non-partitioned data structure like an IAtomicLong. For a partitioned data structure like an IMap, the returned value will not be null, but otherwise undefined.

Specified by:

getPartitionKey in interface DistributedObject

Returns:

the partition key.

getName

public String getName()

Description copied from interface: DistributedObject

Returns the unique name for this DistributedObject. The returned value will never be null. The suggested way for getting name is retrieving it through DistributedObjectUtil.getName(DistributedObject) because this might be also a PrefixedDistributedObject.

Specified by:

getName in interface DistributedObject

Returns:

the unique name for this object.

getServiceName

public String getServiceName()

Description copied from interface: DistributedObject

Returns the service name for this object.

Specified by:

getServiceName in interface DistributedObject

Returns:

the service name for this object.

destroy

public void destroy()

Description copied from interface: DistributedObject

Destroys this object cluster-wide. Clears and releases all resources for this object.

Specified by:

destroy in interface DistributedObject