gr.uoa.di.madgik.grs.store.event

Class FileEventStore

java.lang.Object

gr.uoa.di.madgik.grs.store.event.FileEventStore

All Implemented Interfaces:

IEventStore

public class FileEventStore
extends Object
implements IEventStore

Implementation of the IEventStore using a RandomAccessFile over a local file as the persistency medium

Author:

gpapanikos

Constructor Summary

Constructors

Constructor and Description
FileEventStore() Creates a new instance

Method Summary

Modifier and Type	Method and Description
void	dispose() Disposes the IEventStore instance as well as any permanent storage resources occupied
long	getEventCount() Retrieves the number of BufferEvents stored using this IEventStore
void	persist(BufferEvent event) Persists the provided BufferEvent
BufferEvent	retrieveByIndex(long eventIndex) Retrieve a previously stored BufferEvent based on the index by which it was stored

Methods inherited from class java.lang.Object

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

Constructor Detail

FileEventStore

public FileEventStore()
               throws IOException

Creates a new instance

Throws:

IOException

Method Detail

getEventCount

public long getEventCount()

Retrieves the number of BufferEvents stored using this IEventStore

Specified by:

getEventCount in interface IEventStore

Returns:

the number of BufferEvents stored

See Also:

IEventStore.getEventCount()

dispose

public void dispose()
             throws GRS2EventStoreException

Disposes the IEventStore instance as well as any permanent storage resources occupied

Specified by:

dispose in interface IEventStore

Throws:

GRS2EventStoreException - the state of the IEventStore does not allow for this operation to be completed

See Also:

IEventStore.dispose()

persist

public void persist(BufferEvent event)
             throws GRS2EventStoreException

Persists the provided BufferEvent

Specified by:

persist in interface IEventStore

Parameters:

event - the BufferEvent to persist

Throws:

GRS2EventStoreException - the state of the IEventStore does not allow for this operation to be completed

See Also:

IEventStore.persist(BufferEvent)

retrieveByIndex

public BufferEvent retrieveByIndex(long eventIndex)
                            throws GRS2EventStoreException

Retrieve a previously stored BufferEvent based on the index by which it was stored

Specified by:

retrieveByIndex in interface IEventStore

Parameters:

eventIndex - The index by which the BufferEvent to be retrieved was stored

Returns:

the BufferEvent retrieved

Throws:

GRS2EventStoreException - the state of the IEventStore does not allow for this operation to be completed

See Also:

IEventStore.retrieveByIndex(long)