org.apache.tephra.persist

Interface TransactionVisibilityState

All Known Implementing Classes:

TransactionSnapshot

public interface TransactionVisibilityState

Transaction Visibility state contains information required by TransactionProcessor CoProcessor to determine cell visibility.

Method Summary

Methods

Modifier and Type	Method and Description
NavigableMap<Long,TransactionManager.InProgressTx>	getInProgress() Returns the map of write pointers to in-progress transactions at the time of the snapshot.
Collection<Long>	getInvalid() Returns the list of invalid write pointers at the time of the snapshot.
long	getReadPointer() Returns the read pointer at the time of the snapshot.
long	getTimestamp() Returns the timestamp from when this snapshot was created.
long	getVisibilityUpperBound()
long	getWritePointer() Returns the next write pointer at the time of the snapshot.

Method Detail

getTimestamp

long getTimestamp()

Returns the timestamp from when this snapshot was created.

getReadPointer

long getReadPointer()

Returns the read pointer at the time of the snapshot.

getWritePointer

long getWritePointer()

Returns the next write pointer at the time of the snapshot.

getInvalid

Collection<Long> getInvalid()

Returns the list of invalid write pointers at the time of the snapshot.

getInProgress

NavigableMap<Long,TransactionManager.InProgressTx> getInProgress()

Returns the map of write pointers to in-progress transactions at the time of the snapshot.

getVisibilityUpperBound

long getVisibilityUpperBound()

Returns:

transaction id X such that any of the transactions newer than X might be invisible to some of the currently in-progress transactions or to those that will be started

NOTE: the returned tx id can be invalid.