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PregeneratedMessage.cs
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executable file
·121 lines (107 loc) · 5.46 KB
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#region License
// The PostgreSQL License
//
// Copyright (C) 2015 The Npgsql Development Team
//
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose, without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph and the following two paragraphs appear in all copies.
//
// IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY
// FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
// INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
// DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
// THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
// ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS NO OBLIGATIONS
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
#endregion
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.IO;
using System.Linq;
using System.Text;
namespace Npgsql.FrontendMessages
{
/// <summary>
/// A frontend message of an arbitrary type that has been pregenerated for efficiency - it is kept
/// in byte[] form and doesn't have to be serialized for each send.
/// </summary>
class PregeneratedMessage : SimpleFrontendMessage
{
readonly byte[] _data;
readonly string _description;
/// <summary>
/// Constructs a new pregenerated message.
/// </summary>
/// <param name="data">The data to be sent for this message, not including the 4-byte length.</param>
/// <param name="description">Optional string form/description for debugging</param>
internal PregeneratedMessage(byte[] data, string description=null)
{
Contract.Requires(data.Length < NpgsqlBuffer.MinimumBufferSize);
_data = data;
_description = description;
}
internal override int Length { get { return _data.Length; } }
internal override void Write(NpgsqlBuffer buf)
{
buf.WriteBytes(_data, 0, _data.Length);
}
public override string ToString()
{
return _description ?? "[?]";
}
static NpgsqlBuffer _tempBuf;
static PregeneratedMessage()
{
_tempBuf = new NpgsqlBuffer(new MemoryStream(), NpgsqlBuffer.MinimumBufferSize, Encoding.ASCII);
BeginTransRepeatableRead = BuildQuery("BEGIN; SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;");
BeginTransSerializable = BuildQuery("BEGIN; SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;");
BeginTransReadCommitted = BuildQuery("BEGIN; SET TRANSACTION ISOLATION LEVEL READ COMMITTED;");
BeginTransReadUncommitted = BuildQuery("BEGIN; SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;");
CommitTransaction = BuildQuery("COMMIT");
RollbackTransaction = BuildQuery("ROLLBACK");
DiscardAll = BuildQuery("DISCARD ALL");
UnlistenAll = BuildQuery("UNLISTEN *");
KeepAlive = BuildQuery("SELECT NULL");
SetStmtTimeout10Sec = BuildQuery("SET statement_timeout = 10000");
SetStmtTimeout20Sec = BuildQuery("SET statement_timeout = 20000");
SetStmtTimeout30Sec = BuildQuery("SET statement_timeout = 30000");
SetStmtTimeout60Sec = BuildQuery("SET statement_timeout = 60000");
SetStmtTimeout90Sec = BuildQuery("SET statement_timeout = 90000");
SetStmtTimeout120Sec = BuildQuery("SET statement_timeout = 120000");
_tempBuf = null;
}
static PregeneratedMessage BuildQuery(string query)
{
Contract.Requires(query != null && query.All(c => c < 128));
var totalLen = 5 + query.Length;
var ms = new MemoryStream(totalLen);
_tempBuf.Underlying = ms;
var simpleQuery = new QueryMessage(query);
simpleQuery.Write(_tempBuf);
_tempBuf.Flush();
return new PregeneratedMessage(ms.ToArray(), simpleQuery.ToString());
}
internal static readonly PregeneratedMessage BeginTransRepeatableRead;
internal static readonly PregeneratedMessage BeginTransSerializable;
internal static readonly PregeneratedMessage BeginTransReadCommitted;
internal static readonly PregeneratedMessage BeginTransReadUncommitted;
internal static readonly PregeneratedMessage CommitTransaction;
internal static readonly PregeneratedMessage RollbackTransaction;
internal static readonly PregeneratedMessage DiscardAll;
internal static readonly PregeneratedMessage UnlistenAll;
internal static readonly PregeneratedMessage KeepAlive;
internal static readonly PregeneratedMessage SetStmtTimeout10Sec;
internal static readonly PregeneratedMessage SetStmtTimeout20Sec;
internal static readonly PregeneratedMessage SetStmtTimeout30Sec;
internal static readonly PregeneratedMessage SetStmtTimeout60Sec;
internal static readonly PregeneratedMessage SetStmtTimeout90Sec;
internal static readonly PregeneratedMessage SetStmtTimeout120Sec;
}
}