org.apache.river.outrigger.snaplogstore

Class PendingTxn

java.lang.Object

org.apache.river.outrigger.snaplogstore.PendingTxn

All Implemented Interfaces:

Serializable

class PendingTxn
extends Object
implements Serializable

This object represents a pending transaction in a BackEnd. As operations are performed under the transaction, they are logged into this object. When the transaction is committed, each operation is committed into the DB.

Author:

Sun Microsystems, Inc.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
(package private) static class	PendingTxn.PendingOp A superclass for the objects that represent pending operations.
(package private) static class	PendingTxn.TakeOp An object that represents a pending take.
(package private) static class	PendingTxn.WriteOp An object that represents a pending write.

Field Summary

Fields

Modifier and Type	Field and Description
private long	id
private Hashtable	ops
private int	state
private StoredObject	transaction

Constructor Summary

Constructors

Constructor and Description
PendingTxn(Long id) Create a new PendingTxn for the given id.

Method Summary

Modifier and Type	Method and Description
(package private) void	addTake(byte[] cookie) Add a new pending take operation.
(package private) void	addWrite(Resource entry) Add a new pending write operation.
(package private) void	commit(BackEnd processor) Commit all the operations by invoking the relevant method on the processor object.
boolean	equals(Object o)
(package private) Resource	get(ByteArrayWrapper cookie) Get a pending write resource.
int	hashCode()
(package private) void	prepare(StoredObject tr) Set the Transaction object.
(package private) boolean	recover(Recover space) Recover prepared transactions.
(package private) Resource	remove(ByteArrayWrapper cookie) Remove a pending write.

Methods inherited from class java.lang.Object

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

Field Detail

id

private final long id

state

private volatile int state

ops

private final Hashtable ops

transaction

private volatile StoredObject transaction

Constructor Detail

PendingTxn

PendingTxn(Long id)

Create a new PendingTxn for the given id.

Method Detail

addWrite

void addWrite(Resource entry)

Add a new pending write operation.

addTake

void addTake(byte[] cookie)

Add a new pending take operation.

get

Resource get(ByteArrayWrapper cookie)

Get a pending write resource.

remove

Resource remove(ByteArrayWrapper cookie)

Remove a pending write.

recover

boolean recover(Recover space)
         throws Exception

Recover prepared transactions. This method returns true if this pending transaction was recovered.

Throws:

Exception

prepare

void prepare(StoredObject tr)

Set the Transaction object.

commit

void commit(BackEnd processor)

Commit all the operations by invoking the relevant method on the processor object.

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object