org.apache.jackrabbit.data.core

Class TransactionContext

java.lang.Object

org.apache.jackrabbit.data.core.TransactionContext

public class TransactionContext
extends Object

Represents the transaction on behalf of the component that wants to explicitly demarcate transaction boundaries. After having been prepared, schedules a task that rolls back the transaction if some time passes without any further action. This will guarantee that global objects locked by one of the resources' InternalXAResource.prepare(org.apache.jackrabbit.data.core.TransactionContext) method, are eventually unlocked.

Constructor Summary

Constructors

Constructor and Description
TransactionContext(Xid xid, InternalXAResource[] resources) Create a new instance of this class.

Method Summary

Modifier and Type	Method and Description
void	commit() Commit the transaction identified by this context.
Object	getAttribute(String name) Return an attribute value on this transaction.
static Object	getCurrentThreadId() Returns the current thread identifier.
static boolean	isSameThreadId(Object a, Object b) Compares the given thread identifiers for equality.
boolean	isSuspended() Return a flag indicating whether the association is suspended.
void	prepare() Prepare the transaction identified by this context.
void	removeAttribute(String name) Remove an attribute on this transaction.
void	rollback() Rollback the transaction identified by this context.
void	setAttribute(String name, Object value) Set an attribute on this transaction.
void	setSuspended(boolean suspended) Set a flag indicating whether the association is suspended.

Methods inherited from class java.lang.Object

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

Constructor Detail

TransactionContext

public TransactionContext(Xid xid,
                          InternalXAResource[] resources)

Create a new instance of this class.

Parameters:

xid - associated xid

resources - transactional resources

Method Detail

setAttribute

public void setAttribute(String name,
                         Object value)

Set an attribute on this transaction. If the value specified is null, it is semantically equivalent to removeAttribute(java.lang.String).

Parameters:

name - attribute name

value - attribute value

getAttribute

public Object getAttribute(String name)

Return an attribute value on this transaction.

Parameters:

name - attribute name

Returns:

attribute value, null if no attribute with that name exists

removeAttribute

public void removeAttribute(String name)

Remove an attribute on this transaction.

Parameters:

name - attribute name

prepare

public void prepare()
             throws XAException

Prepare the transaction identified by this context. Prepares changes on all resources. If some resource reports an error on prepare, automatically rollback changes on all other resources. Throw exception at the end if errors were found.

Throws:

XAException - if an error occurs

commit

public void commit()
            throws XAException

Commit the transaction identified by this context. Commits changes on all resources. If some resource reports an error on commit, automatically rollback changes on all other resources. Throw exception at the end if some commit failed.

Throws:

XAException - if an error occurs

rollback

public void rollback()
              throws XAException

Rollback the transaction identified by this context. Rolls back changes on all resources. Throws exception at the end if errors were found.

Throws:

XAException - if an error occurs

isSuspended

public boolean isSuspended()

Return a flag indicating whether the association is suspended.

Returns:

true if the association is suspended; false otherwise

setSuspended

public void setSuspended(boolean suspended)

Set a flag indicating whether the association is suspended.

Parameters:

suspended - flag whether that the association is suspended.

getCurrentThreadId

public static Object getCurrentThreadId()

Returns the current thread identifier. The identifier is either the current thread instance or the global transaction identifier wrapped in a XidWrapper, when running under a transaction.

Returns:

current thread identifier

isSameThreadId

public static boolean isSameThreadId(Object a,
                                     Object b)

Compares the given thread identifiers for equality.

See Also:

getCurrentThreadId()