com.hazelcast.concurrent.lock

Class InternalLockNamespace

java.lang.Object

com.hazelcast.concurrent.lock.InternalLockNamespace

All Implemented Interfaces:

DataSerializable, ObjectNamespace, ServiceNamespace

public final class InternalLockNamespace
extends Object
implements ObjectNamespace

A specialization of ObjectNamespace intended to be used by ILock proxies. It intentionally does not use name field in equals() and hashcode() methods. This is a hack to share a single instance of LockStore for all ILocks proxies (per partition). Discussion: If we included the name in equals()/hashcode() methods then each ILock would create its own LockStoreImpl. Each LockStoreImpl contains additional mapping key -> LockResource. However ILock proxies always use a single key only thus creating a LockStoreImpl for each ILock would introduce an unnecessary indirection and memory waster. Also each LockStoreImpl is maintaining its own scheduler for lock eviction purposes, etc. I originally wanted to remove the name field and use a constant, but it has side-effects - for example when a ILock proxy is destroyed then you want to destroy all pending BlockingOperation

See Also:

LockStoreContainer.getOrCreateLockStore(ObjectNamespace), OperationParkerImpl.cancelParkedOperations(String, Object, Throwable)

Constructor Summary

Constructors

Constructor and Description
InternalLockNamespace()
InternalLockNamespace(String name)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
String	getObjectName() Gets the object name within the service.
String	getServiceName() Name of the service
int	hashCode()
void	readData(ObjectDataInput in) Reads fields from the input stream
String	toString()
void	writeData(ObjectDataOutput out) Writes object fields to output stream

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

InternalLockNamespace

public InternalLockNamespace()

InternalLockNamespace

public InternalLockNamespace(String name)

Method Detail

getServiceName

public String getServiceName()

Description copied from interface: ServiceNamespace

Name of the service

Specified by:

getServiceName in interface ServiceNamespace

Returns:

name of the service

getObjectName

public String getObjectName()

Description copied from interface: ObjectNamespace

Gets the object name within the service.

Specified by:

getObjectName in interface ObjectNamespace

Returns:

the object name within the service

writeData

public void writeData(ObjectDataOutput out)
               throws IOException

Description copied from interface: DataSerializable

Writes object fields to output stream

Specified by:

writeData in interface DataSerializable

Parameters:

out - output

Throws:

IOException - if an I/O error occurs. In particular, an IOException may be thrown if the output stream has been closed.

readData

public void readData(ObjectDataInput in)
              throws IOException

Description copied from interface: DataSerializable

Reads fields from the input stream

Specified by:

readData in interface DataSerializable

Parameters:

in - input

Throws:

IOException - if an I/O error occurs. In particular, an IOException may be thrown if the input stream has been closed.

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object