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using Npgsql.Internal;

namespace Npgsql;

/// <summary>

/// Thrown when trying to use a connection that is already busy performing some other operation.

/// Provides information on the already-executing operation to help with debugging.

/// </summary>

public sealed class NpgsqlOperationInProgressException : NpgsqlException

{

/// <summary>

/// Creates a new instance of <see cref="NpgsqlOperationInProgressException" />.

/// </summary>

/// <param name="command">

/// A command which was in progress when the operation which triggered this exception was executed.

/// </param>

public NpgsqlOperationInProgressException(NpgsqlCommand command)

: base("A command is already in progress: " + command.CommandText)

=> CommandInProgress = command;

internal NpgsqlOperationInProgressException(ConnectorState state)

: base($"The connection is already in state '{state}'")

{

}

/// <summary>

/// If the connection is busy with another command, this will contain a reference to that command.

/// Otherwise, if the connection if busy with another type of operation (e.g. COPY), contains

/// <see langword="null" />.

/// </summary>

public NpgsqlCommand? CommandInProgress { get; }

}