net.sf.ehcache.writer.writebehind.operations
Class DeleteOperation

java.lang.Object
  net.sf.ehcache.writer.writebehind.operations.DeleteOperation

All Implemented Interfaces:

KeyBasedOperation, SingleOperation

public class DeleteOperation
extends Object
implements SingleOperation

Implements the delete operation for write behind

Version:

$Id: DeleteOperation.java 5793 2012-06-13 23:53:16Z twu $

Author:

Geert Bevin

Constructor Summary

DeleteOperation(CacheEntry entry)
Create a new delete operation for a particular entry

DeleteOperation(CacheEntry entry, long creationTime)
Create a new delete operation for a particular entry and creation time

Method Summary

BatchOperation	createBatchOperation(List<SingleOperation> operations) Creates a batch operation that corresponds to the operation type of this single operation.
boolean	equals(Object other)
long	getCreationTime() Retrieves the moment when the operation was created.
CacheEntry	getEntry() Retrieves the entry that will be used for this operation
Object	getKey() Retrieves the element key for this operation.
SingleOperationType	getType() Returns a stable identifier for the type this operation can be classified in.
int	hashCode()
void	performSingleOperation(CacheWriter cacheWriter) Perform this operation as a single execution with the provided cache writer
void	throwAway(CacheWriter cacheWriter, RuntimeException e) Called when all retries have failed

Methods inherited from class java.lang.Object

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

Constructor Detail

DeleteOperation

public DeleteOperation(CacheEntry entry)

Create a new delete operation for a particular entry

Parameters:

entry - the entry to delete

DeleteOperation

public DeleteOperation(CacheEntry entry,
                       long creationTime)

Create a new delete operation for a particular entry and creation time

Parameters:

entry - the entry to delete

creationTime - the creation time of the operation

Method Detail

performSingleOperation

public void performSingleOperation(CacheWriter cacheWriter)

Perform this operation as a single execution with the provided cache writer

Specified by:

performSingleOperation in interface SingleOperation

Parameters:

cacheWriter - the cache writer this operation should be performed upon

createBatchOperation

public BatchOperation createBatchOperation(List<SingleOperation> operations)

Creates a batch operation that corresponds to the operation type of this single operation.

This batch operation will not be stored in the queue anymore and is solely used for structuring. The data from the single operation will already be processed in the final form that will be expected by the CacheWriter that will be used to execute the batch operation.

Specified by:

createBatchOperation in interface SingleOperation

Parameters:

operations - the single operations that need to be regrouped in the batch operation

Returns:

the created batch operation

getKey

public Object getKey()

Retrieves the element key for this operation.

Specified by:

getKey in interface KeyBasedOperation

Returns:

the key of the element that is concerned by the operation.

getCreationTime

public long getCreationTime()

Retrieves the moment when the operation was created.

Specified by:

getCreationTime in interface KeyBasedOperation

Returns:

the creation time in milliseconds

getEntry

public CacheEntry getEntry()

Retrieves the entry that will be used for this operation

getType

public SingleOperationType getType()

Returns a stable identifier for the type this operation can be classified in. This is used to group and order batched operations.

Specified by:

getType in interface SingleOperation

Returns:

the identifier for this operation type

throwAway

public void throwAway(CacheWriter cacheWriter,
                      RuntimeException e)

Called when all retries have failed

Specified by:

throwAway in interface SingleOperation

Parameters:

cacheWriter - the CacheWriter to delegate to

e - the last exception encountered

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object other)

Overrides:

equals in class Object