npgsql/src/Npgsql/Replication/XLogDataMessage.cs at main · npgsql/npgsql

34 lines (29 loc) · 1.21 KB

using System;

using System.IO;

using NpgsqlTypes;

namespace Npgsql.Replication;

/// <summary>

/// A message representing a section of the WAL data stream.

/// </summary>

public class XLogDataMessage : ReplicationMessage

{

/// <summary>

/// A section of the WAL data stream that is raw WAL data in physical replication or decoded with the selected

/// logical decoding plugin in logical replication. It is only valid until the next <see cref="XLogDataMessage"/>

/// is requested from the stream.

/// </summary>

/// <remarks>

/// A single WAL record is never split across two XLogData messages.

/// When a WAL record crosses a WAL page boundary, and is therefore already split using continuation records,

/// it can be split at the page boundary. In other words, the first main WAL record and its continuation

/// records can be sent in different XLogData messages.

/// </remarks>

public Stream Data { get; private set; } = default!;

internal XLogDataMessage Populate(

NpgsqlLogSequenceNumber walStart, NpgsqlLogSequenceNumber walEnd, DateTime serverClock, Stream data)

{

base.Populate(walStart, walEnd, serverClock);

Data = data;

return this;

}

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