MSMQ突破4M限制的方法 [ZT]
在默认情况下msmq 3.0(windows xp ,windows 2003)最大单个消息(Message size)大小4M;(包括正文和全部指定属性的消息的大小不能超过 4 MB。 来自windows 2003帮助文件的说明。)
4M的限制对于一些普通的应用来说已经足够,而且作为消息传递,报文交换,我们推荐的是不要使用超过1M大小的报文。这样可以很好的利用网络带宽,和提高系统的处理性能。 但对于一些特别少数的应用仍然存在大报文的需求,而msmq作为一个消息中间件有很多优势。所以我们还是要想办法使用他,或是扩展他的功能。
下面就我在网上和通过一些网友的帮助整理了一些突破这个4M限制方法。
1.通过修改注册表(regedit)HKLM\SOFTWARE\Microsoft\MSMQ\Parameters\ 加添一个MaxMessageSize DWORD值大小默认4M(0x00400000)最大16M(x00F00000),通过试验发现最大只能是16M左右,如果在改大,再调用程序的是否会报错
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using (System.Messaging.MessageQueue mq = new System.Messaging.MessageQueue(".\\private$\\mq3"))
{
System.Messaging.Message msg = new System.Messaging.Message();
msg.BodyStream = new FileStream("e:\\CodeSmithProfessional-40.msi", FileMode.Open);
mq.Send(msg);
}
private void SendFile(string fileName, string queuePath)
{
int i;
int count = 0;
int msgNumber = 0;
int chunkSize = 4194000;
//Open an existing queue
MessageQueue queue = new MessageQueue(queuePath);
System.Messaging.Message msg = new System.Messaging.Message();
MessageQueueTransaction t = new MessageQueueTransaction();
t.Begin();
try
{
//Open the file for reading
using (FileStream fs = File.OpenRead(fileName))
{
// while there are bytes
while ((i = fs.ReadByte()) != -1)
{
// if count has reached size, send message
if (count >= chunkSize)
{
msgNumber++;
msg.AppSpecific = msgNumber;
//Send the messsage
queue.Send(msg,t);
string nextMsgId = msg.Id;
count = 0;
//Create a new message
msg = new System.Messaging.Message();
msg.CorrelationId = nextMsgId;
}
msg.BodyStream.WriteByte((byte)i);
count++; // from the original file
}
msgNumber++;
msg.AppSpecific = msgNumber;
//Send the last message
queue.Send(msg, t);
t.Commit();
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
finally
{
//release queue resources
queue.Close();
}
}
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private void ReceiveFile(string fileName, string queuePath)
{
byte[] data;
int length;
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//Open an existing queue
MessageQueue queue = new MessageQueue(queuePath);
try
{
//Open file for writing
using (FileStream fs = File.OpenWrite(fileName))
{
//Receive the first message
System.Messaging.Message msg = queue.Receive(new TimeSpan(0, 0, 0, 1));
while (msg != null)
{
//Get the Lenght of the message body stream
length = Convert.ToInt32(msg.BodyStream.Length);
//Create a buffer to hold the stream in memory
data = new byte[length];
//Read the body stream
msg.BodyStream.Read(data, 0, length);
//Write the buffer into the file
fs.Write(data, 0, length);
//Receive following message
msg = queue.Receive(new TimeSpan(0, 0, 0, 1));
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
finally
{
//release queue resources
queue.Close();
}
}
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string queueFormatName = "";// args[0];
string fileName = "";// args[1];
queueFormatName = @"DIRECT=OS:ibm-t60\private$\myq";
fileName = "e:\\OpenbravoERP-2.35-windows-installer.exe";
LargeMessage message =
new LargeMessage(new FileStream(fileName, FileMode.Open, FileAccess.Read));
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LargeMessageQueue queue =
new LargeMessageQueue(queueFormatName);
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queue.Open();
try
{
queue.Send(message);
}
finally
{
queue.Close();
}
4M的限制对于一些普通的应用来说已经足够,而且作为消息传递,报文交换,我们推荐的是不要使用超过1M大小的报文。这样可以很好的利用网络带宽,和提高系统的处理性能。
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2.消息分段发送,通过Message.ID,Message.CorrelationId关联,分割多个固定大小的消息.
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3.使用BizTalk MSMQ Adapter,支持消息分段(segmentationSupport=true),前提队列必须是事务性(transactional=true),MaxMessageSize最大可以4G,试验证实一个通过passthru方式处理一个200M的文件,处理占用大量cpu和IO外,BizTalk MessageBox数据也更大400M(200M日志文件,200M数据文件)。注意:通过方法2实现的分段,在用BizTalk接收会存在问题,BizTalk不会帮组合成一个大文件处理。
4.使用BizTalk提供的一个LargeMessage api可以以编成方式实现对大报文的处理,处理方式和方法3类似。并且可以实现和BizTalk兼容。
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