61 lines
4.2 KiB
Markdown
61 lines
4.2 KiB
Markdown
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---
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source_files:
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- Common/DTS.Common/Events/GroupTemplates/CustomChannels/CustomChannelExportFileSetEvent.cs
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- Common/DTS.Common/Events/GroupTemplates/CustomChannels/CustomChannelImportEvent.cs
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generated_at: "2026-04-16T03:25:48.906062+00:00"
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model: "Qwen/Qwen3-Coder-Next-FP8"
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schema_version: 1
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sha256: "7dcb7f08a2b119d1"
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---
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# CustomChannels
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## Documentation: Custom Channel Events Module
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### 1. Purpose
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This module defines Prism-based pub/sub events used to coordinate custom channel import and export operations within the application. Specifically, `CustomChannelExportFileSetEvent` signals that a custom channel export file set has been prepared (and the application should update its busy/available state accordingly), while `CustomChannelImportEvent` communicates the completion status of a custom channel import operation. These events decouple the UI and business logic layers during asynchronous custom channel workflows.
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### 2. Public Interface
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- **`CustomChannelExportFileSetEvent`**
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- *Type*: `class` inheriting from `PubSubEvent<string>`
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- *Behavior*: A Prism event used to notify subscribers that a custom channel export file set has been generated. Despite inheriting `PubSubEvent<string>`, the event payload type is not actively used in the current implementation (see *Gotchas*). Subscribers should interpret publication of this event as a signal to mark the application as available (e.g., disable busy indicators).
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- **`CustomChannelImportEvent`**
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- *Type*: `class` inheriting from `PubSubEvent<CustomChannelImportEventArgs>`
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- *Behavior*: A Prism event used to notify subscribers of the completion status of a custom channel import operation. Currently only supports a single status (`Done`).
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- **`CustomChannelImportEventArgs`**
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- *Type*: `class`
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- *Properties*:
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- `Status ImportStatus { get; }` – The completion status of the import operation.
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- *Constructors*:
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- `CustomChannelImportEventArgs(Status status)` – Initializes the args with the given `Status`.
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- *Nested Enum*:
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- `enum Status { Done }` – Represents possible import outcomes. Only `Done` is defined.
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### 3. Invariants
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- `CustomChannelImportEventArgs.ImportStatus` is immutable after construction (read-only property).
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- `CustomChannelImportEventArgs.Status` currently supports only one value (`Done`). No other statuses (e.g., `Failed`, `Cancelled`) are defined or used in the source.
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- `CustomChannelExportFileSetEvent` inherits from `PubSubEvent<string>`, but no payload is expected or used (see *Gotchas*).
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### 4. Dependencies
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- **Dependencies *of* this module**:
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- `Prism.Events` (specifically `PubSubEvent<T>`).
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- No other internal modules or types are referenced in the source files.
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- **Dependencies *on* this module**:
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- Not specified in the provided source, but by convention, modules handling custom channel import/export workflows (e.g., UI view models, service layers) are expected to subscribe to these events.
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### 5. Gotchas
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- **Payload type mismatch in `CustomChannelExportFileSetEvent`**:
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The class inherits from `PubSubEvent<string>`, implying a `string` payload, but the XML documentation and naming suggest it is used as a *signal* (not a data carrier). There is no evidence in the source that any subscriber expects or receives a `string` argument. This may indicate legacy or incomplete refactoring. Subscribers should treat this event as a *unit signal* (i.e., ignore the payload).
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- **Extensibility limitation in `CustomChannelImportEventArgs.Status`**:
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The `Status` enum currently contains only `Done`. If future workflows require additional statuses (e.g., `Error`, `Cancelled`), this enum must be extended—but doing so without updating all subscribers could lead to unhandled cases.
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- **No error reporting mechanism**:
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`CustomChannelImportEvent` only signals completion (`Done`). There is no provision for conveying error details, partial success, or cancellation. If import failures need to be communicated, a new event or extension of `CustomChannelImportEventArgs` would be required.
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- **Empty `<remarks>` sections**:
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Neither event includes meaningful remarks in its XML documentation, suggesting minimal initial documentation effort or reliance on external design documents.
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