Class TxnReadUncommitted

java.lang.Object

org.aksw.commons.txn.impl.TxnReadUncommitted

All Implemented Interfaces:

Txn

Direct Known Subclasses:

TxnSerializable

public class TxnReadUncommitted
extends Object
implements Txn

Field Summary

Fields

Modifier and Type	Field	Description
protected com.google.common.cache.LoadingCache<Path<String>, TxnResourceApi>	containerCache
protected String	txnId
protected TxnMgrImpl	txnMgr

Constructor Summary

Constructors

Constructor	Description
TxnReadUncommitted(TxnMgrImpl txnMgr, String txnId)

Method Summary

Modifier and Type	Method	Description
void	addCommit()
void	addFinalize()
void	addRollback()
boolean	claim()	Instruct this TxnMgr to try to claim (i.e.
void	cleanUpTxn()
protected TxnResourceApi	createResourceApi(Path<String> key)
Instant	getActivityDate()
Instant	getCreationDate()
TemporalAmount	getDurationToNextHeartbeat()
String	getId()	Get the id of this transaction
Instant	getMostRecentHeartbeat()
TxnResourceApi	getResourceApi(Path<String> resRelPath)	Get access to a resource as seen from this txn
TxnMgr	getTxnMgr()
boolean	isCommit()
boolean	isFinalize()
boolean	isRollback()
boolean	isStale()	Whether the transaction has become stale
boolean	isWrite()
Stream<TxnResourceApi>	listVisibleFiles(Path<String> prefix)
void	promote()	Promote a read transaction to write.
void	setActivityDate(Instant instant)	Update the transaction's most recent activity timestamp to given timestamp; Used to prevent other processes from considering the transaction stale.
Stream<Path<String>>	streamAccessedResourcePaths()
void	updateHeartbeat()

Methods inherited from class Object

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

Methods inherited from interface Txn

updateActivityDate

Field Details

txnMgr

protected TxnMgrImpl txnMgr

txnId

protected String txnId

containerCache

protected com.google.common.cache.LoadingCache<Path<String>, TxnResourceApi> containerCache

Constructor Details

TxnReadUncommitted

public TxnReadUncommitted(TxnMgrImpl txnMgr,
 String txnId)

Method Details

createResourceApi

protected TxnResourceApi createResourceApi(Path<String> key)

getId

public String getId()

Description copied from interface: Txn

Get the id of this transaction

Specified by:

getId in interface Txn

promote

public void promote()

Description copied from interface: Txn

Promote a read transaction to write.

Specified by:

promote in interface Txn

getTxnMgr

public TxnMgr getTxnMgr()

Specified by:

getTxnMgr in interface Txn

listVisibleFiles

public Stream<TxnResourceApi> listVisibleFiles(Path<String> prefix)

Specified by:

listVisibleFiles in interface Txn

getCreationDate

public Instant getCreationDate()

Specified by:

getCreationDate in interface Txn

getResourceApi

public TxnResourceApi getResourceApi(Path<String> resRelPath)

Description copied from interface: Txn

Get access to a resource as seen from this txn

Specified by:

getResourceApi in interface Txn

isWrite

public boolean isWrite()

Specified by:

isWrite in interface Txn

cleanUpTxn

public void cleanUpTxn()
                throws IOException

Specified by:

cleanUpTxn in interface Txn

Throws:

IOException

addCommit

public void addCommit()
               throws IOException

Specified by:

addCommit in interface Txn

Throws:

IOException

addFinalize

public void addFinalize()
                 throws IOException

Specified by:

addFinalize in interface Txn

Throws:

IOException

addRollback

public void addRollback()
                 throws IOException

Specified by:

addRollback in interface Txn

Throws:

IOException

isFinalize

public boolean isFinalize()
                   throws IOException

Specified by:

isFinalize in interface Txn

Throws:

IOException

isCommit

public boolean isCommit()
                 throws IOException

Specified by:

isCommit in interface Txn

Throws:

IOException

isRollback

public boolean isRollback()
                   throws IOException

Specified by:

isRollback in interface Txn

Throws:

IOException

streamAccessedResourcePaths

public Stream<Path<String>> streamAccessedResourcePaths()
                                                 throws IOException

Specified by:

streamAccessedResourcePaths in interface Txn

Throws:

IOException

setActivityDate

public void setActivityDate(Instant instant)
                     throws IOException

Description copied from interface: Txn

Update the transaction's most recent activity timestamp to given timestamp; Used to prevent other processes from considering the transaction stale.

Specified by:

setActivityDate in interface Txn

Throws:

IOException

getActivityDate

public Instant getActivityDate()
                        throws IOException

Specified by:

getActivityDate in interface Txn

Throws:

IOException

isStale

public boolean isStale()
                throws IOException

Description copied from interface: Txn

Whether the transaction has become stale

Specified by:

isStale in interface Txn

Throws:

IOException

claim

public boolean claim()
              throws IOException

Description copied from interface: Txn

Instruct this TxnMgr to try to claim (i.e. take ownership) of this txn. Should only be used on stale transactions. A claim fails - indicated by a return value of false - if the txn's heartbeat timeout has not been reached. This condition also occurs if another thread won the competition for claiming a txn.

Specified by:

claim in interface Txn

Throws:

IOException

updateHeartbeat

public void updateHeartbeat()
                     throws IOException

Specified by:

updateHeartbeat in interface Txn

Throws:

IOException

getMostRecentHeartbeat

public Instant getMostRecentHeartbeat()
                               throws IOException

Specified by:

getMostRecentHeartbeat in interface Txn

Throws:

IOException

getDurationToNextHeartbeat

public TemporalAmount getDurationToNextHeartbeat()
                                          throws IOException

Specified by:

getDurationToNextHeartbeat in interface Txn

Throws:

IOException