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using Connected.Data.Sharding;
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using Connected.Entities.Storage;
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using System.Collections.Immutable;
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namespace Connected.Data.Storage;
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/// <summary>
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/// This middleware provides one or more connection for the specified arguments.
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/// </summary>
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/// <remarks>
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/// If entity supports sharding (provided by <see cref="IShardingMiddleware"/>) it is possible that
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/// more than one connection will be returned. For the transactions only one connection is tipically returned
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/// since only one entity at a time is usually performed. For query operations the scenario could be more complex
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/// because data could reside in more than one shard. In that case one connection for each shhard will be returned.
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/// </remarks>
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public interface IConnectionProvider
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{
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/// <summary>
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/// Opens one or more connections for the specified arguments.
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/// </summary>
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/// <typeparam name="TEntity">The type of the entity on which storage operations will be performed.</typeparam>
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/// <param name="args">The arguments describing what operation is about to be performed.</param>
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/// <returns>One or more storage connections. One connection if entity does not supports sharding, more if
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/// it supports it and the operation requires data from more than one shard.</returns>
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Task<ImmutableList<IStorageConnection>> Open<TEntity>(StorageContextArgs args);
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StorageConnectionMode Mode { get; set; }
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}
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