TBoldAbstractPessimisticLockHandler

Unit: BoldSystem

Declaration

TBoldAbstractPessimisticLockHandler = class(TBoldSystemExtension)

Hierarchy

1. TObject
2. TBoldMemoryManagedObject
3. TBoldInterfacedObject
4. TBoldNonRefCountedObject
5. TBoldSystemExtension
6. TBoldAbstractPessimisticLockHandler
7. Direct subclasses
8. TBoldPessimisticLockHandler

Description

The pessimistic lock handler defines methods for requesting and releasing locks for domain elements.

Methods

Name	Summary	Notes
EnsureLocks		abstract
LockElement		abstract
ReleaseUnneededRegions		abstract

EnsureLocks

function EnsureLocks: Boolean; virtual; abstract;

This method is called automatically before update to check with the Lock Manager server that the client still holds the locks it should. There is normally no need to call it directly.

See Also

• Related Topics

LockElement

function LockElement(Element: TBoldDomainElement): Boolean; virtual; abstract;

Requests the required locks for the element. If the call returns true, the element is then allowed to be modified. If the call returns false, the required locks could not be obtained.

See Also

• Related Topics

ReleaseUnneededRegions

procedure ReleaseUnneededRegions; virtual; abstract;

Releases the locks that the client holds, that it does not need. Locks for elements that are dirty, i.e. where the client holds a modified state, are kept. This method also releases the so-called exclusive database lock.

See Also

• Related Topics

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