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namespace Connected.Data;
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/// <summary>
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/// Represents an entity with a conditional visibillity.
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/// </summary>
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/// <remarks>
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/// Some entities require a singleton access which protects
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/// them from being processed by multiple clients at a time. This
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/// entity serves for such purpose. One example is queue message which
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/// must be processed only by a single client. But, on the other hand,
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/// a client has only a limited available time to process it successfully.
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/// If it's not processed in time, other client gets opportunity to process
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/// the message. The isolation is achieved through the PopReceipt property
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/// which is updated everytime client dequeues the message. This means other
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/// clients can't successfully update (or delete) the message once other
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/// clients was granted the access.
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/// </remarks>
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public interface IPopReceipt
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{
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/// <summary>
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/// The id of the current scope. The id is available only upon the expiration
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/// (NextVisible).
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/// </summary>
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Guid? PopReceipt { get; init; }
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/// <summary>
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/// The date and time the current PopReceipt expires and the access is granted to
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/// other client.
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/// </summary>
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DateTime NextVisible { get; init; }
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}
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