// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
// =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
//
// ISourceBlock.cs
//
//
// The base interface for all source blocks.
//
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
 
namespace System.Threading.Tasks.Dataflow
{
    /// <summary>Represents a dataflow block that is a source of data.</summary>
    /// <typeparam name="TOutput">Specifies the type of data supplied by the <see cref="ISourceBlock{TOutput}"/>.</typeparam>
    public interface ISourceBlock<out TOutput> : IDataflowBlock
    {
        // IMPLEMENT IMPLICITLY
 
        /// <include file='XmlDocs/CommonXmlDocComments.xml' path='CommonXmlDocComments/Sources/Member[@name="LinkTo"]/*' />
        IDisposable LinkTo(ITargetBlock<TOutput> target, DataflowLinkOptions linkOptions);
 
        // IMPLEMENT EXPLICITLY
 
        /// <include file='XmlDocs/CommonXmlDocComments.xml' path='CommonXmlDocComments/Sources/Member[@name="ConsumeMessage"]/*' />
        TOutput? ConsumeMessage(DataflowMessageHeader messageHeader, ITargetBlock<TOutput> target, out bool messageConsumed);
 
        /// <include file='XmlDocs/CommonXmlDocComments.xml' path='CommonXmlDocComments/Sources/Member[@name="ReserveMessage"]/*' />
        bool ReserveMessage(DataflowMessageHeader messageHeader, ITargetBlock<TOutput> target);
 
        /// <include file='XmlDocs/CommonXmlDocComments.xml' path='CommonXmlDocComments/Sources/Member[@name="ReleaseReservation"]/*' />
        void ReleaseReservation(DataflowMessageHeader messageHeader, ITargetBlock<TOutput> target);
    }
}