net.jini.core.transaction.server

Class NestableServerTransaction

java.lang.Object

net.jini.core.transaction.server.ServerTransaction

net.jini.core.transaction.server.NestableServerTransaction

All Implemented Interfaces:

Serializable, NestableTransaction, Transaction

public class NestableServerTransaction
extends ServerTransaction
implements NestableTransaction

Class implementing the NestableTransaction interface, for use with transaction participants that implement the default transaction semantics.

Since:

1.0

Author:

Sun Microsystems, Inc.

See Also:

NestableTransaction, NestableTransactionManager, TransactionFactory, Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface net.jini.core.transaction.NestableTransaction

NestableTransaction.Created

Field Summary

Fields

Modifier and Type	Field and Description
NestableServerTransaction	parent The parent transaction, if any.

Fields inherited from class net.jini.core.transaction.server.ServerTransaction

id, mgr

Constructor Summary

Constructors

Constructor and Description
NestableServerTransaction(AtomicSerial.GetArg arg)
NestableServerTransaction(NestableTransactionManager mgr, long id, NestableServerTransaction parent) Simple constructor.

Method Summary

Modifier and Type	Method and Description
NestableTransaction.Created	create(long leaseTime) Create a new nested transaction, with the current transaction as parent, managed by the same transaction manager as the current transaction.
NestableTransaction.Created	create(NestableTransactionManager mgr, long leaseTime) Create a new nested transaction, with the current transaction as parent, managed by the given transaction manager.
boolean	enclosedBy(NestableTransaction enclosing) Return true if the specified transaction is an ancestor of this transaction.
boolean	equals(Object other) Two instances are equal if they have the same transaction manager and the same transaction id.
int	hashCode() The assumption here is two transactions are still equal if they have the same transaction manager and the same transaction id, regardless of whether one is or is not nested.
boolean	isNested() Return true if the transaction has a parent, false if the transaction is top level.
void	promote(TransactionParticipant[] parts, long[] crashCounts, TransactionParticipant drop) Promote the listed participants (from a subtransaction) into this (the parent) transaction.
String	toString()

Methods inherited from class net.jini.core.transaction.server.ServerTransaction

abort, abort, commit, commit, getState, join

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.jini.core.transaction.Transaction

abort, abort, commit, commit

Field Detail

parent

public final NestableServerTransaction parent

The parent transaction, if any.

Constructor Detail

NestableServerTransaction

public NestableServerTransaction(AtomicSerial.GetArg arg)
                          throws IOException

Throws:

IOException

NestableServerTransaction

public NestableServerTransaction(NestableTransactionManager mgr,
                                 long id,
                                 NestableServerTransaction parent)

Simple constructor. Clients should not call this directly, but should instead use TransactionFactory and NestableTransaction methods.

Parameters:

mgr - the manager for this transaction

id - the transaction id

parent - the parent transaction, if any

Method Detail

create

public NestableTransaction.Created create(NestableTransactionManager mgr,
                                          long leaseTime)
                                   throws UnknownTransactionException,
                                          CannotJoinException,
                                          LeaseDeniedException,
                                          RemoteException

Description copied from interface: NestableTransaction

Create a new nested transaction, with the current transaction as parent, managed by the given transaction manager.

Specified by:

create in interface NestableTransaction

Parameters:

mgr - the transaction manager to use for this transaction

leaseTime - the requested lease time for the transaction

Returns:

the created transaction and the lease granted

Throws:

UnknownTransactionException - if the parent transaction is unknown to the parent transaction manager, either because the transaction ID is incorrect or because the transaction is no longer active and its state has been discarded by the manager.

CannotJoinException - if the parent transaction is known to the manager but is no longer active.

LeaseDeniedException - if this manager is unwilling to grant the requested lease time

RemoteException - if there is a communication error

create

public NestableTransaction.Created create(long leaseTime)
                                   throws UnknownTransactionException,
                                          CannotJoinException,
                                          LeaseDeniedException,
                                          RemoteException

Description copied from interface: NestableTransaction

Create a new nested transaction, with the current transaction as parent, managed by the same transaction manager as the current transaction.

Specified by:

create in interface NestableTransaction

Parameters:

leaseTime - the requested lease time for the transaction

Returns:

the created transaction and the lease granted

Throws:

UnknownTransactionException - if the parent transaction is unknown to the parent transaction manager, either because the transaction ID is incorrect or because the transaction is no longer active and its state has been discarded by the manager.

CannotJoinException - if the parent transaction is known to the manager but is no longer active.

LeaseDeniedException - if this manager is unwilling to grant the requested lease time

RemoteException - if there is a communication error

promote

public void promote(TransactionParticipant[] parts,
                    long[] crashCounts,
                    TransactionParticipant drop)
             throws UnknownTransactionException,
                    CannotJoinException,
                    CrashCountException,
                    RemoteException

Promote the listed participants (from a subtransaction) into this (the parent) transaction. This method is for use by the manager of a subtransaction when the subtransaction commits. At this point, all participants of the subtransaction must become participants in the parent transaction. Prior to this point, the subtransaction's manager was a participant of the parent transaction, but after a successful promotion it need no longer be one (if it was not itself a participant of the subtransaction), and so it may specify itself as a participant to drop from the transaction. Otherwise, participants should not be dropped out of transactions. For each promoted participant, the participant's crash count is stored in the corresponding element of the crashCounts array.

Parameters:

parts - the participants being promoted to the parent

crashCounts - the crash counts of the participants

drop - the manager to drop out, if any

Throws:

CrashCountException - if the crash count provided for at least one participant differs from the crash count in a previous invocation of the same pairing of participant and transaction

UnknownTransactionException - if a transaction is unknown to the transaction manager, either because the transaction ID is incorrect or because the transaction is complete and its state has been discarded by the manager.

CannotJoinException - if a transaction is known to the manager but is no longer active.

RemoteException - if there is a communication error

See Also:

NestableTransactionManager.promote(long, net.jini.core.transaction.server.TransactionParticipant[], long[], net.jini.core.transaction.server.TransactionParticipant)

enclosedBy

public boolean enclosedBy(NestableTransaction enclosing)

Return true if the specified transaction is an ancestor of this transaction.

Parameters:

enclosing - transaction to test for being an ancestor

Returns:

true if the specified transaction is an ancestor of this transaction.

isNested

public boolean isNested()

Description copied from class: ServerTransaction

Return true if the transaction has a parent, false if the transaction is top level.

Overrides:

isNested in class ServerTransaction

Returns:

true if the transaction has a parent, false if the transaction is top level.

toString

public String toString()

Overrides:

toString in class ServerTransaction

hashCode

public int hashCode()

The assumption here is two transactions are still equal if they have the same transaction manager and the same transaction id, regardless of whether one is or is not nested.

Overrides:

hashCode in class ServerTransaction

equals

public boolean equals(Object other)

Two instances are equal if they have the same transaction manager and the same transaction id. The assumption here is two transactions are still equal if they have the same transaction manager and the same transaction id, regardless of whether one is or is not nested.

Overrides:

equals in class ServerTransaction