116 lines
8.1 KiB
Markdown
116 lines
8.1 KiB
Markdown
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---
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source_files:
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- Common/DTS.Common/Classes/ClockSync/IClockSyncProfile.cs
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- Common/DTS.Common/Classes/ClockSync/ClockSyncProfile.cs
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- Common/DTS.Common/Classes/ClockSync/ClockSyncProfileConverter.cs
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- Common/DTS.Common/Classes/ClockSync/ClockSyncProfileCollection.cs
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generated_at: "2026-04-16T03:15:09.204079+00:00"
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model: "Qwen/Qwen3-Coder-Next-FP8"
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schema_version: 1
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sha256: "e412b56844d5af45"
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---
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# ClockSync
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## Documentation: Clock Sync Profile Module
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### 1. Purpose
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This module defines and manages clock synchronization profiles for the DTS system, enabling configuration of different master clock input sources (e.g., PTP IEEE 1588, IRIG-B, GPS, 1PPS). It provides a singleton collection (`ClockSyncProfileCollection`) that loads profile definitions from an XML file (`ClockSyncProfiles.xml`), falling back to a default set if the file is missing. Profiles are represented by the `ClockSyncProfile` class, which implements the `IClockSyncProfile` interface and supports metadata-driven initialization from an enum (`ClockSyncProfileDefaults`). The module also includes a type converter (`ClockSyncProfileConverter`) for UI integration (e.g., property grids), ensuring only visible profiles are exposed and sorted by display order.
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---
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### 2. Public Interface
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#### `IClockSyncProfile` (Interface)
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- **`int ProfileId { get; set; }`**
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Unique integer identifier for the profile.
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- **`string ProfileName { get; set; }`**
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Human-readable name of the profile (e.g., `"PTP IEEE 1588"`).
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- **`string ProfileDesc { get; set; }`**
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Description of the profile’s behavior or purpose.
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- **`int DisplayOrder { get; set; }`**
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Integer priority for ordering profiles in UI (lower values appear first).
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- **`bool Visible { get; set; }`**
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Flag indicating whether the profile should be shown in UI (e.g., property grids).
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- **`DASRestriction[] FilterRestrictions { get; set; }`**
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Array of restrictions (of type `DASRestriction`) applied to the profile; used to filter applicable DAS configurations.
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#### `ClockSyncProfile` (Concrete Implementation)
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- **`ClockSyncProfile()`**
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Parameterless constructor for deserialization.
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- **`ClockSyncProfile(int profileId, string profileName, string profileDesc, int displayOrder, bool visible, DASRestriction[] filterRestrictions)`**
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Initializes a profile with explicit values via `Initialize()`.
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- **`ClockSyncProfile(ClockSyncProfileCollection.ClockSyncProfileDefaults defaults, DASRestriction[] restrictions)`**
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Initializes a profile by extracting metadata (name, description, order, visibility) from the `ClockSyncProfileDefaults` enum using reflection on `[Display]` and `[Browsable]` attributes, then calls `Initialize()`.
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- **`override string ToString()`**
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Returns `ProfileName`.
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#### `ClockSyncProfileConverter` (Type Converter)
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- **`ClockSyncProfile[] Values { get; }`**
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Lazily-initialized array of *visible* profiles from the singleton collection, sorted by `DisplayOrder`. Thread-safe via `lock`.
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- **`override bool CanConvertFrom(...)`**
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Returns `true` if `sourceType == typeof(string)` (enables string-to-profile conversion by name).
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- **`override object ConvertFrom(...)`**
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Converts a string (profile name) to a `ClockSyncProfile` instance by matching `ProfileName` in `Values`. Returns `null` if no match.
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- **`override bool GetStandardValuesSupported(...)`**
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Returns `true` (indicates standard values are available).
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- **`override bool GetStandardValuesExclusive(...)`**
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Returns `true` (indicates only standard values are valid; no free-text input).
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- **`override StandardValuesCollection GetStandardValues(...)`**
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Returns a `StandardValuesCollection` containing *all* profiles from the singleton collection (including non-visible ones).
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#### `ClockSyncProfileCollection` (Singleton Collection)
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- **`static ClockSyncProfileCollection GetCollection()`**
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Thread-safe singleton accessor. Loads profiles from `ClockSyncProfiles.xml` (creating it with defaults if missing).
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- **`ClockSyncProfile GetClockSyncProfile(string s)`**
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Returns the first profile matching `ProfileName == s`. If no match, returns the profile with `ProfileId == 0` (typically `"None"`). If neither exists, returns the first item in the collection.
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- **Constants**:
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- `NONE_NAME`, `PTPIEEE1588_NAME`, `IRIGB1PPS_NAME`, `GPS1PPS_NAME`, `IRIGB_NAME`, `_1PPS_NAME`
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Hardcoded string constants for profile names (e.g., `"PTP IEEE 1588"`).
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- **`ClockSyncProfileDefaults` Enum**:
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Defines default profile types with `[Display]` and `[Browsable]` attributes:
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- `None` (ID=0)
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- `PTPIEEE1588` (ID=1)
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- `IRIGB1PPS` (ID=2)
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- `GPS1PPS` (ID=4)
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- `IRIGB` (ID=8)
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- `_1PPS` (ID=16)
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Values use bit-shifted powers of two (e.g., `1 << 0`, `1 << 1`), but IDs are cast to `int` directly in `GetProfileInfo()`.
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---
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### 3. Invariants
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- **Singleton Consistency**: `GetCollection()` always returns the same instance after first initialization.
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- **Profile Visibility Filtering**: `ClockSyncProfileConverter.Values` only includes profiles where `Visible == true`.
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- **Display Order Sorting**: `ClockSyncProfileConverter.Values` is sorted ascending by `DisplayOrder` (using `int.MaxValue` as fallback for missing order).
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- **Fallback Profile Selection**: `GetClockSyncProfile(string)` prioritizes exact name match, then `ProfileId == 0`, then first item.
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- **XML File Handling**: `ClockSyncProfiles.xml` is auto-generated with defaults if missing; existing file is never overwritten.
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- **Enum Metadata Dependency**: `ClockSyncProfile`’s enum-based constructor relies on `[Display]` and `[Browsable]` attributes being present on `ClockSyncProfileDefaults` members. Missing attributes cause runtime exceptions (e.g., `IndexOutOfRangeException` on `valueAttributes[0]`).
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---
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### 4. Dependencies
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- **Internal Dependencies**:
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- `DTS.Common.Classes.DSP.DASRestriction` (used in `FilterRestrictions`).
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- `System.ComponentModel.DataAnnotations` (for `[Display]`, `[Browsable]`).
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- `System.Xml.Serialization` (for XML serialization/deserialization).
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- `System.Collections.ObjectModel.Collection<T>` (base class).
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- **External Dependencies**:
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- `ClockSyncProfileCollection` depends on `DASRestriction` type (defined elsewhere in `DTS.Common`).
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- `ClockSyncProfileConverter` depends on `ClockSyncProfileCollection` (singleton access).
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- **Depended Upon By**:
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- UI components (e.g., property grids) via `ClockSyncProfileConverter`.
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- Other modules requiring clock sync configuration (e.g., DSP configuration logic).
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---
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### 5. Gotchas
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- **Enum ID Mismatch**: `ClockSyncProfileDefaults` uses bit-shifted values (e.g., `1 << 0 = 1`, `1 << 1 = 2`), but `GetProfileInfo()` casts the enum value directly to `int` for `profileId`. This means `IRIGB1PPS` has `ProfileId = 2`, not `1`. Ensure downstream logic does not assume sequential IDs.
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- **Attribute Dependency**: If `[Display]` or `[Browsable]` attributes are missing on a `ClockSyncProfileDefaults` member, `GetProfileInfo()` throws `IndexOutOfRangeException` (accessing `valueAttributes[0]` without null checks).
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- **Thread-Safe Lazy Initialization**: `ClockSyncProfileConverter.Values` uses double-checked locking but reinitializes `_values` only once per app domain. Subsequent modifications to the collection (e.g., via `GetCollection().Add(...)`) will *not* update `_values` until the converter is recreated.
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- **Non-Visible Profiles in StandardValues**: `GetStandardValues()` returns *all* profiles (including non-visible ones), while `Values` returns only visible ones. This inconsistency may confuse consumers expecting uniform filtering.
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- **Hardcoded XML Filename**: `CLOCKSYNC_PROFILE_XML_FILE = "ClockSyncProfiles.xml"` is hardcoded; no configuration override is provided.
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- **No Validation on `FilterRestrictions`**: `FilterRestrictions` is a `DASRestriction[]` with no null-checking or validation in constructors. Passing `null` may cause `NullReferenceException` downstream.
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- **No Profile Modification Support**: The collection is read-only after initialization (via `Collection<T>` base). Adding/removing profiles at runtime requires direct manipulation of `Items`, which bypasses validation.
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None identified beyond these.
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