oracle.ideimpl.webupdate.task
Class AtomicTask

java.lang.Object
  oracle.ideimpl.webupdate.task.AtomicTask

Direct Known Subclasses:

CreateFile, DeinstallExtensionTask, DeleteFile, InstallExtensionTask, ReadPropertiesFile, ScheduleHookTask, WritePropertiesFile

public abstract class AtomicTask
extends java.lang.Object

An atomic task is a discrete operation during installation of an update that can be rolled back. A given instance of the task will store any necessary information it needs to rollback.

Constructor Summary

AtomicTask()

Method Summary

void	commit(TaskContext tc) Commit this task.
protected HashStructure	getProperties() Get (persistent) properties used by this task.
protected void	pause() Pause for a period of time.
abstract void	perform(TaskContext tc) Perform this task.
abstract void	rollback(TaskContext tc) Roll this task back.

Methods inherited from class java.lang.Object

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

Constructor Detail

AtomicTask

public AtomicTask()

Method Detail

pause

protected final void pause()

Pause for a period of time. This is used for diagnostic purposes and only has an effect if SLOWDOWN > 0.

getProperties

protected HashStructure getProperties()

Get (persistent) properties used by this task.

Returns:

properties used by this task.

perform

public abstract void perform(TaskContext tc)
                      throws TaskFailedException

Perform this task.

Throws:

TaskFailedException

rollback

public abstract void rollback(TaskContext tc)
                       throws TaskFailedException

Roll this task back.

Throws:

TaskFailedException

commit

public void commit(TaskContext tc)
            throws TaskFailedException

Commit this task. This may be used if the work carried out in perform() creates backups or other temporary changes which must be committed only if all tasks in a set are successful.

Throws:

TaskFailedException