Class BeginXact

java.lang.Object

org.apache.derby.impl.store.raw.xact.BeginXact

All Implemented Interfaces:

Externalizable, Serializable, Formatable, TypedFormat, Loggable

public class BeginXact
extends Object
implements Loggable

This operation indicates the beginning of a transaction.

See Also:

• Loggable
• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected int	transactionStatus
protected GlobalTransactionId	xactId

Fields inherited from interface Loggable

ABORT, BI_LOG, CHECKSUM, COMMIT, COMPENSATION, FILE_RESOURCE, FIRST, LAST, PREPARE, RAWSTORE, XA_NEEDLOCK

Constructor Summary

Constructors

Constructor	Description
BeginXact()
BeginXact(GlobalTransactionId xid, int s)

Method Summary

Modifier and Type	Method	Description
void	doMe(Transaction xact, LogInstant instant, LimitObjectInput in)	Apply the change indicated by this operation and optional data.
GlobalTransactionId	getGlobalId()	BeginXact method
ByteArray	getPreparedLog()	the default for prepared log is always null for all the operations that don't have optionalData.
int	getTypeFormatId()	Return my format identifier.
int	group()	BeginXact is both a FIRST and a RAWSTORE log record
boolean	needsRedo(Transaction xact)	Always redo a BeginXact.
void	readExternal(ObjectInput in)
void	releaseResource(Transaction xact)	BeginXact has no resource to release
String	toString()	DEBUG: Print self.
void	writeExternal(ObjectOutput out)

Methods inherited from class Object

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

Field Details

transactionStatus

protected int transactionStatus

xactId

protected GlobalTransactionId xactId

Constructor Details

BeginXact

public BeginXact(GlobalTransactionId xid,
 int s)

BeginXact

public BeginXact()

Method Details

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Throws:

IOException

ClassNotFoundException

getTypeFormatId

public int getTypeFormatId()

Return my format identifier.

Specified by:

getTypeFormatId in interface TypedFormat

Returns:

The identifier. (A UUID stuffed in an array of 16 bytes).

doMe

public void doMe(Transaction xact,
 LogInstant instant,
 LimitObjectInput in)

Apply the change indicated by this operation and optional data.

Specified by:

doMe in interface Loggable

Parameters:

xact - the Transaction

instant - the log instant of this operation

in - optional data

getPreparedLog

public ByteArray getPreparedLog()

the default for prepared log is always null for all the operations that don't have optionalData. If an operation has optional data, the operation need to prepare the optional data for this method. BeginXact has no optional data to write out

Specified by:

getPreparedLog in interface Loggable

See Also:

• ObjectOutput

needsRedo

public boolean needsRedo(Transaction xact)

Always redo a BeginXact.

Specified by:

needsRedo in interface Loggable

Parameters:

xact - The transaction trying to redo this operation

Returns:

true if operation needs redoing, false if not.

See Also:

• Loggable.releaseResource(Transaction)

releaseResource

public void releaseResource(Transaction xact)

BeginXact has no resource to release

Specified by:

releaseResource in interface Loggable

group

public int group()

BeginXact is both a FIRST and a RAWSTORE log record

Specified by:

group in interface Loggable

toString

public String toString()

DEBUG: Print self.

Overrides:

toString in class Object

getGlobalId

public GlobalTransactionId getGlobalId()

BeginXact method