BeginXact (Apache Derby V10.14 Internals)

java.lang.Object
- org.apache.derby.impl.store.raw.xact.BeginXact

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, Formatable, TypedFormat, Loggable
```
public class BeginXact
extends java.lang.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 org.apache.derby.iapi.store.raw.Loggable
  ABORT, BI_LOG, CHECKSUM, COMMIT, COMPENSATION, FILE_RESOURCE, FIRST, LAST, PREPARE, RAWSTORE, XA_NEEDLOCK

Fields
Modifier and Type	Field	Description
`protected int`	`transactionStatus`
`protected GlobalTransactionId`	`xactId`

Constructor Summary

Constructors
Constructor Description

BeginXact()

BeginXact(GlobalTransactionId xid, int s)

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

Method Summary

All Methods Instance Methods Concrete Methods
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(java.io.ObjectInput in)`
`void`	`releaseResource(Transaction xact)`	BeginXact has no resource to release
`java.lang.String`	`toString()`	DEBUG: Print self.
`void`	`writeExternal(java.io.ObjectOutput out)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - transactionStatus
```
protected int transactionStatus
```
  - xactId
```
protected GlobalTransactionId xactId
```
- Constructor Detail
  - BeginXact
```
public BeginXact(GlobalTransactionId xid,
                 int s)
```
  - BeginXact
```
public BeginXact()
```
- Method Detail
  - writeExternal
```
public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException
```
    Specified by:
    
    writeExternal in interface java.io.Externalizable
    
    Throws:
    
    java.io.IOException
  - readExternal
```
public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException,
                         java.lang.ClassNotFoundException
```
    Specified by:
    
    readExternal in interface java.io.Externalizable
    
    Throws:
    
    java.io.IOException
    
    java.lang.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(org.apache.derby.iapi.store.raw.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 java.lang.String toString()
```
    DEBUG: Print self.
    
    Overrides:
    
    toString in class java.lang.Object
  - getGlobalId
```
public GlobalTransactionId getGlobalId()
```
    BeginXact method

Class BeginXact

Field Summary

Fields inherited from interface org.apache.derby.iapi.store.raw.Loggable

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

transactionStatus

xactId

Constructor Detail

BeginXact

BeginXact

Method Detail

writeExternal

readExternal

getTypeFormatId

doMe

getPreparedLog

needsRedo

releaseResource

group

toString

getGlobalId