Package org.apache.qpid.protonj2.engine

Interface Transaction<E extends Endpoint<?>>

Type Parameters:

E - The parent of this Transaction either a TransactionController or TransactionManager

All Known Implementing Classes:

ProtonTransaction

public interface Transaction<E extends Endpoint<?>>

A Transaction object that hold information and context for a single Transaction.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	Transaction.DischargeState	Provides state for this Transaction.

Method Summary

Modifier and Type	Method	Description
Attachments	getAttachments()
ErrorCondition	getCondition()	If the declare or discharge of the transaction caused its state to become TransactionState FAILED this method returns the ErrorCondition that the remote used to describe the reason for the failure.
Transaction.DischargeState	getDischargeState()	For a Transaction that has either been requested to discharge or has successfully discharged the Transaction.DischargeState reflects whether the transaction was to be committed or rolled back.
Object	getLinkedResource()
<T> T	getLinkedResource(Class<T> typeClass)	Gets the linked resource (if set) and returns it using the type information provided to cast the returned value.
TransactionState	getState()
Binary	getTxnId()	Returns the transaction Id that is associated with the declared transaction.
boolean	isDeclared()
boolean	isDischarged()
boolean	isFailed()	The parent resource will mark the Transaction as failed is any of the operations performed on it cannot be successfully completed such as a Declare operation failing to write due to an IO error.
E	parent()	Returns a reference to the parent of this Transaction which will be either a TransactionController or a TransactionManager manager depending on the end of the Link that is operating on the Transaction.
void	setLinkedResource(Object resource)	Links a given resource to this Transaction.

Method Detail

getState

TransactionState getState()

Returns:

the current Transaction state.

getDischargeState

Transaction.DischargeState getDischargeState()

For a Transaction that has either been requested to discharge or has successfully discharged the Transaction.DischargeState reflects whether the transaction was to be committed or rolled back. Prior to a discharge being attempted there is no state value and this method returns a Transaction.DischargeState of none.

Returns:

the current Transaction.DischargeState of the transaction.

isDeclared

boolean isDeclared()

Returns:

true if the Transaction has been marked declared by the TransactionManager.

isDischarged

boolean isDischarged()

Returns:

true if the Transaction has been marked discharged by the TransactionManager.

isFailed

boolean isFailed()

The parent resource will mark the Transaction as failed is any of the operations performed on it cannot be successfully completed such as a Declare operation failing to write due to an IO error.

Returns:

true if the Transaction has been marked failed by the parent resource.

getCondition

ErrorCondition getCondition()

If the declare or discharge of the transaction caused its state to become TransactionState FAILED this method returns the ErrorCondition that the remote used to describe the reason for the failure.

Returns:

the ErrorCondition that the TransactionManager used to fail the Transaction.

parent

E parent()

Returns a reference to the parent of this Transaction which will be either a TransactionController or a TransactionManager manager depending on the end of the Link that is operating on the Transaction.

Returns:

a reference to the parent of this Transaction.

getTxnId

Binary getTxnId()

Returns the transaction Id that is associated with the declared transaction. Prior to a TransactionManager completing a transaction declaration this method will return null to indicate that the transaction has not been declared yet.

Returns:

the transaction Id associated with the transaction once successfully declared.

getAttachments

Attachments getAttachments()

Returns:

the Attachments instance that is associated with this Transaction

setLinkedResource

void setLinkedResource(Object resource)

Links a given resource to this Transaction.

Parameters:

resource - The resource to link to this Transaction.

getLinkedResource

Object getLinkedResource()

Returns:

the user set linked resource for this Transaction instance.

getLinkedResource

<T> T getLinkedResource(Class<T> typeClass)

Gets the linked resource (if set) and returns it using the type information provided to cast the returned value.

Type Parameters:

T - The type to cast the linked resource to if one is set.

Parameters:

typeClass - the type's Class which is used for casting the returned value.

Returns:

the user set linked resource for this Context instance.

Throws:

ClassCastException - if the linked resource cannot be cast to the type requested.