org.gcube.documentstore.persistence

Class FallbackPersistenceBackend

java.lang.Object

org.gcube.documentstore.persistence.PersistenceBackend

org.gcube.documentstore.persistence.FallbackPersistenceBackend

public class FallbackPersistenceBackend
extends PersistenceBackend

Author:

Luca Frosini (ISTI - CNR)

Field Summary

Fields inherited from class org.gcube.documentstore.persistence.PersistenceBackend

aggregationScheduler, fallbackPersistence, fallbackUseCounter, fallbackUseStartTime, forceFallbackUse, MAX_FALLBACK_RETRY, MAX_TIME_TO_FALLBACK, persistenceBackendMonitor

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	FallbackPersistenceBackend(File fallbackFile)

Method Summary

Modifier and Type	Method and Description
protected void	accountWithFallback(Record... records)
protected void	clean() This method is used to allow PersistenceBackend implementations to clean a global status if any (or to renew it) when to much exceptions occurs trying to persist Records.
void	close() This method is used to close
protected void	closeConnection() This method is used to close db connection
protected File	getFallbackFile()
protected File	getOldFallbackFile() Deprecated.
boolean	isConnectionActive() Check the Connection state
protected File	moveFallbackFile(String suffix) Move the fallbackFile to a new file with the same name by appending a suffix
protected void	openConnection() This method is used to open db connection
void	prepareConnection(PersistenceBackendConfiguration configuration) Prepare the connection to persistence.
protected void	printLine(String line) This method is synchronized on fallbackFile.
protected void	reallyAccount(Record record) This method contains the code to save the Record

Methods inherited from class org.gcube.documentstore.persistence.PersistenceBackend

account, accountValidateAggregate, flush, flush, getAggregationScheduler, getFallbackPersistence, setAggregationScheduler, setFallback

Methods inherited from class java.lang.Object

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

Constructor Detail

FallbackPersistenceBackend

protected FallbackPersistenceBackend(File fallbackFile)

Method Detail

getFallbackFile

protected File getFallbackFile()

Returns:

the fallbackFile

getOldFallbackFile

@Deprecated
protected File getOldFallbackFile()

Deprecated.

moveFallbackFile

protected File moveFallbackFile(String suffix)

Move the fallbackFile to a new file with the same name by appending a suffix

Parameters:

suffix -

Returns:

the moved file if any, null otherwise

prepareConnection

public void prepareConnection(PersistenceBackendConfiguration configuration)

Prepare the connection to persistence. This method must be used by implementation class to prepare the connection with the persistence storage, DB, file etc.

Specified by:

prepareConnection in class PersistenceBackend

Parameters:

configuration - The configuration to create the connection

openConnection

protected void openConnection()
                       throws Exception

Description copied from class: PersistenceBackend

This method is used to open db connection

Specified by:

openConnection in class PersistenceBackend

Throws:

Exception

close

public void close()
           throws Exception

This method is used to close

Overrides:

close in class PersistenceBackend

Throws:

Exception

accountWithFallback

protected void accountWithFallback(Record... records)
                            throws Exception

Overrides:

accountWithFallback in class PersistenceBackend

Throws:

Exception

reallyAccount

protected void reallyAccount(Record record)

This method contains the code to save the Record

Specified by:

reallyAccount in class PersistenceBackend

printLine

protected void printLine(String line)
                  throws Exception

This method is synchronized on fallbackFile. Any actions which has to modify, rename or delete the file must be synchronized on this file. To retrieve it use getFallbackFile() method. This is intended for internal library usage only so that is protected. It

Throws:

Exception

closeConnection

protected void closeConnection()
                        throws Exception

Description copied from class: PersistenceBackend

This method is used to close db connection

Specified by:

closeConnection in class PersistenceBackend

Throws:

Exception

isConnectionActive

public boolean isConnectionActive()
                           throws Exception

Description copied from class: PersistenceBackend

Check the Connection state

Specified by:

isConnectionActive in class PersistenceBackend

Returns:

true if the connection is active, false otherwise

Throws:

Exception

clean

protected void clean()
              throws Exception

Description copied from class: PersistenceBackend

This method is used to allow PersistenceBackend implementations to clean a global status if any (or to renew it) when to much exceptions occurs trying to persist Records.

Specified by:

clean in class PersistenceBackend

Throws:

Exception