com.bigdata.service

Interface ITxState

All Superinterfaces:

ITxState0

All Known Subinterfaces:

ITx

All Known Implementing Classes:

AbstractTransactionService.TxState, Tx

public interface ITxState
extends ITxState0

Interface for the state associated with a transaction in an ITransactionService.

Author:

Bryan Thompson

Method Summary

Methods

Modifier and Type	Method and Description
boolean	isAborted() A transaction is "aborted" iff it has successfully aborted.
boolean	isActive() A transaction is "active" when it is created and remains active until it prepares or aborts.
boolean	isCommitted() A transaction is "committed" iff it has successfully committed.
boolean	isComplete() A transaction is "complete" once has either committed or aborted.
boolean	isPrepared() A transaction is "prepared" once it has been successfully validated and has fulfilled its pre-commit contract for a multi-stage commit protocol.
boolean	isReadOnly() Return true iff this is a read-only transaction.

Methods inherited from interface com.bigdata.service.ITxState0

getReadsOnCommitTime, getStartTimestamp

Method Detail

isActive

boolean isActive()

A transaction is "active" when it is created and remains active until it prepares or aborts. An active transaction accepts READ, WRITE, DELETE, PREPARE and ABORT requests.

Returns:

True iff the transaction is active.

isPrepared

boolean isPrepared()

A transaction is "prepared" once it has been successfully validated and has fulfilled its pre-commit contract for a multi-stage commit protocol. An prepared transaction accepts COMMIT and ABORT requests.

Note: This is a transient state. Once the transaction has prepared it will transition to either COMMIT or ABORT and this method will no longer report true.

Returns:

True iff the transaction is prepared to commit.

isComplete

boolean isComplete()

A transaction is "complete" once has either committed or aborted. A completed transaction does not accept any requests.

Returns:

True iff the transaction is completed.

isCommitted

boolean isCommitted()

A transaction is "committed" iff it has successfully committed. A committed transaction does not accept any requests.

Returns:

True iff the transaction is committed.

isAborted

boolean isAborted()

A transaction is "aborted" iff it has successfully aborted. An aborted transaction does not accept any requests.

Returns:

True iff the transaction is aborted.

isReadOnly

boolean isReadOnly()

Return true iff this is a read-only transaction.