Data

A value representing the type of events to subscribe to for a node.

It is used for the DataSubscriptionDescriptor.eventType property of the DataSubscriptionDescriptor instance passed:

• to the DataNode.subscribeThroughNotifications(descriptor:file:line:session:queue:then:) method,
• or to the DataNode.subscribeThroughWebhook(_:context:descriptor:file:line:session:queue:then:) method.

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public enum DataEventType : Codable, Equatable, CustomStringConvertible

An object that represents a reference to a database node.

By abuse of language, the node reference is sometimes assimilate with the referred node itself. This does not usually preclude understanding. Just keep in mind that there may be several references for the same database node.

Instances are created using the DataService.node(for:) method of a DataService instance.

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public final class DataNode : Hashable, CustomStringConvertible

extension DataNode: WebcomCombinable

An object representing the Data service of a WebcomApplication instance. This service consists of a database with a tree-like data model (equivalent to a JSON object).

To get an object of this type, use the WebcomApplication.dataService property of a WebcomApplication instance. There is only one instance of this class for each WebcomApplication instance.

This service uses a REST API of the back-end to read and write data. Unlike the DatasyncService, it is not real-time and it does not offer local caching. It is a low-level access.

This service should only be used when it is not possible to use the DatasyncService, especially in extensions where available resources are limited and where therefore the JavaScript SDK cannot be loaded.

When possible, it is always best to use the DatasyncService.

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public final class DataService : WebcomService

extension DataService: WebcomCombinable

An object representing a subscription to Data events.

Instances are created by the DataNode.subscribeThroughNotifications(descriptor:file:line:session:queue:then:) and the DataNode.subscribeThroughWebhook(_:context:descriptor:file:line:session:queue:then:) methods.

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public final class DataSubscription : CustomDebugStringConvertible

extension DataSubscription: WebcomCombinable

A value containing the descriptor for a subscription to events of the DataService.

This value does not depend on a node.

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public struct DataSubscriptionDescriptor : Codable, Equatable, CustomStringConvertible

The value of a node.

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public struct DataValue : WebcomValuable, Hashable, CustomStringConvertible