Joseph Doherty
43 lines
2.0 KiB
C#
43 lines
2.0 KiB
C#
using Microsoft.Extensions.Logging.Abstractions;
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using ZB.MOM.WW.MxGateway.Server.Configuration;
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using ZB.MOM.WW.MxGateway.Server.Grpc;
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namespace ZB.MOM.WW.MxGateway.Server.Sessions;
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/// <summary>
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/// Dependencies a <see cref="GatewaySession"/> needs to construct and own its
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/// <see cref="SessionEventDistributor"/>. Bundled so the session constructor stays a
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/// single optional parameter rather than four, and so unit tests that build a session
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/// directly get a working distributor from <see cref="Default"/> without wiring DI.
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/// </summary>
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/// <param name="Mapper">
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/// Maps worker IPC <c>WorkerEvent</c> frames to public <c>MxEvent</c>s. The distributor
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/// pump applies this once per event in worker order, mirroring the mapping
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/// <c>EventStreamService.ProduceEventsAsync</c> used before Task 4.
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/// </param>
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/// <param name="EventOptions">
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/// Supplies the distributor's per-subscriber queue capacity and replay ring-buffer
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/// bounds (<see cref="EventOptions.QueueCapacity"/>,
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/// <see cref="EventOptions.ReplayBufferCapacity"/>,
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/// <see cref="EventOptions.ReplayRetentionSeconds"/>).
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/// </param>
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/// <param name="DistributorLogger">Logger for the distributor pump lifecycle.</param>
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/// <param name="TimeProvider">Clock used to timestamp and age-evict replay entries.</param>
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public sealed record SessionEventStreaming(
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MxAccessGrpcMapper Mapper,
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EventOptions EventOptions,
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ILogger<SessionEventDistributor> DistributorLogger,
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TimeProvider TimeProvider)
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{
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/// <summary>
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/// Defaults used when a session is constructed without explicit streaming
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/// dependencies (unit tests). Uses a fresh mapper, default event options, a no-op
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/// logger, and the system clock.
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/// </summary>
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public static SessionEventStreaming Default { get; } = new(
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new MxAccessGrpcMapper(),
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new EventOptions(),
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NullLogger<SessionEventDistributor>.Instance,
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TimeProvider.System);
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}
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