uk.ac.ed.epcc.webapp.model.cron

Class LockFactory.Lock

java.lang.Object

uk.ac.ed.epcc.webapp.model.data.DataObject

uk.ac.ed.epcc.webapp.model.Classification

uk.ac.ed.epcc.webapp.model.cron.LockFactory.Lock

All Implemented Interfaces:

java.lang.Comparable<Classification>, java.security.Principal, Contexed, ContextIndexed, Identified, Indexed, Owned, Releasable, Retirable

Enclosing class:

LockFactory

public class LockFactory.Lock
extends Classification
implements Retirable

Field Summary

Fields inherited from class uk.ac.ed.epcc.webapp.model.Classification

DESCRIPTION, fac, NAME, SORT_ORDER

Fields inherited from class uk.ac.ed.epcc.webapp.model.data.DataObject

DEBUG, record

Fields inherited from interface uk.ac.ed.epcc.webapp.forms.Identified

MAX_IDENTIFIER

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Lock(Repository.Record res)

Method Summary

Modifier and Type	Method and Description
boolean	canRetire() Is this object in a state that allows it to be retired.
boolean	isHolding() Is THIS instance holding the lock
boolean	isLocked() is the lock taken
java.util.Date	lastLocked() when was the lock last taken (may not be locked now)
void	releaseLock() release the lock
void	retire() retire this object.
boolean	takeLock() attempt to take the lock
java.util.Date	wasLockedAt() when was the lock taken.

Methods inherited from class uk.ac.ed.epcc.webapp.model.Classification

compareTo, getDescription, getFactory, getIdentifier, getName, getTableSpecification, post_commit, setDescription, setName, toString

Methods inherited from class uk.ac.ed.epcc.webapp.model.data.DataObject

addToMap, addToMap, addToMap, commit, delete, empty, equals, formUpdate, getContext, getDatabaseService, getFactoryTag, getID, getIdentifier, getLogger, getMap, getMap, getOwningFactory, getRecord, getRecord, getRecord, getSQLContext, getUniqueIdName, hashCode, lock, postCreate, pre_commit, release, setContents, setDirty, setMap

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.security.Principal

equals, hashCode, implies

Constructor Detail

Lock

protected Lock(Repository.Record res)

Parameters:

res -

fac -

Method Detail

isLocked

public boolean isLocked()

is the lock taken

Overrides:

isLocked in class DataObject

wasLockedAt

public java.util.Date wasLockedAt()

when was the lock taken. returns null if lock not taken

Returns:

Date

lastLocked

public java.util.Date lastLocked()

when was the lock last taken (may not be locked now)

Returns:

isHolding

public boolean isHolding()

Is THIS instance holding the lock

Returns:

takeLock

public boolean takeLock()
                 throws DataFault

attempt to take the lock

Returns:

true if lock taken

Throws:

DataFault

releaseLock

public void releaseLock()
                 throws DataFault

release the lock

Throws:

DataFault

canRetire

public boolean canRetire()

Description copied from interface: Retirable

Is this object in a state that allows it to be retired.

Specified by:

canRetire in interface Retirable

Returns:

boolean true if retire is possible

retire

public void retire()
            throws java.lang.Exception

Description copied from interface: Retirable

retire this object.

Specified by:

retire in interface Retirable

Throws:

java.lang.Exception