TBoldSubscribablePersistent¶

This is an abstract superclass for classes that need to be subclasses to TPersistent and also need to be subscribable.

Declaration¶

TBoldSubscribablePersistent = class(TPersistent)

Hierarchy¶

TPersistent
TBoldSubscribablePersistent
Direct subclasses
TBoldFollowerController
TBoldFollowerControllerCom

Description¶

It has the same interface as TPublisher, i.e. SendEvent and AddSubscription.

Note

It is implemented by allocating an internal TBoldPublisher and passing the calls on to it.

Properties¶

Name	Summary	Notes
HasSubscribers		read-only
Publisher		protected, read-only

HasSubscribers¶

property HasSubscribers: Boolean;

Publisher¶

property Publisher: TBoldPublisher;

Methods¶

Name	Summary	Notes
AddSmallSubscription
AddSubscription
Create
Destroy		override
FreePublisher		protected
GetHasSubscribers		protected, virtual
SendEvent
SendExtendedEvent	Sends an extended event to all subscribers.
SendQuery	Sends a query to all subscribers

AddSmallSubscription¶

procedure AddSmallSubscription(Subscriber: TBoldSubscriber; Events: TBoldSmallEventSet; RequestedEvent: TBoldRequestedEvent); See Also - AddSmallSubscription

AddSubscription¶

procedure AddSubscription(Subscriber: TBoldSubscriber; OriginalEvent: TBoldEvent; RequestedEvent: TBoldRequestedEvent); See Also - AddSubscription

Create¶

constructor Create;

Destroy¶

destructor Destroy; override;

FreePublisher¶

procedure FreePublisher;

GetHasSubscribers¶

function GetHasSubscribers: Boolean; virtual;

SendEvent¶

procedure SendEvent(Originator: TObject; OriginalEvent: TBoldEvent);

SendEvent notifies all subscribers holding a subscription matching Event by calling their Receive method. If a subscriber holds multiple subscriptions matching the same event, but with different requested events, Receive will be called multiple times, once for each requested event.

SendExtendedEvent¶

procedure SendExtendedEvent(Originator: TObject; OriginalEvent: TBoldEvent; const Args: array of const);

An extended event can pass any arguments to the subscribers. Each event should send a well defined set of arguments that the subscribers can extract additional information from.

SendQuery¶

function SendQuery(Originator: TObject; OriginalEvent: TBoldEvent; const Args: array of const; Subscriber: TBoldSubscriber): Boolean;

A subscriber can subscribe to a query event. Call SendQuery to query all subscribers to the particular query event to see if any subscriber has any objection to the query. If the result of SendQuery is false, this should be interpreted as a veto from one of the subscribers.

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