过去我曾使用RabbitMq作为MessageQueue，在收到消息时触发事件真的很简单。
我查看了IBM安装程序随附的.NET源，但是发现一种不好的方法来处理它。看看示例SimpleSubscribe，它确实可以做到这一点
// getting messages continuously
for (int i = 1; i <= numberOfMsgs; i++)
{
// creating a message object
message = new MQMessage();
try
{
topic.Get(message);
Console.WriteLine("Message " + i + " got = " + message.ReadString(message.MessageLength));
message.ClearMessage();
}
catch (MQException mqe)
{
if (mqe.ReasonCode == 2033)
{
++time;
--i;
Console.WriteLine("No message available");
Thread.Sleep(1000);
//waiting for 10sec
if (time > 10)
{
Console.WriteLine("Timeout : No message available");
break;
}
continue;
}
else
{
Console.WriteLine("MQException caught: {0} - {1}", mqe.ReasonCode, mqe.Message);
}
}
}
其中numberOfMsgs的数字是作为参数传递的整数。如果我通过-1，它可能会无限大，但我认为这不是一个好方法。这导致我以特定的时间间隔汇集队列，然后可能会将线程旋转为100％，而我没有放置Thread.Sleep
有谁有更好的方法？
答案 0 :(得分：4)
您应该使用“ MQGET with Wait”选项，而不要使用轮询。 MQGET调用将等待消息到达，并在收到消息后立即返回，否则将等待“ x”毫秒。
这是一个简单的C＃MQ程序：
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using IBM.WMQ;
/// <summary> Program Name
/// MQTest62
///
/// Description
/// This C# class will connect to a remote queue manager
/// and get messages from a queue using a managed .NET environment.
///
/// Sample Command Line Parameters
/// -h 127.0.0.1 -p 1415 -c TEST.CHL -m MQWT1 -q TEST.Q1 -u tester -x mypwd
/// </summary>
/// <author> Roger Lacroix
/// </author>
namespace MQTest62
{
public class MQTest62
{
private Hashtable inParms = null;
private Hashtable qMgrProp = null;
private System.String qManager;
private System.String inputQName;
/*
* The constructor
*/
public MQTest62()
: base()
{
}
/// <summary> Make sure the required parameters are present.</summary>
/// <returns> true/false
/// </returns>
private bool allParamsPresent()
{
bool b = inParms.ContainsKey("-h") && inParms.ContainsKey("-p") &&
inParms.ContainsKey("-c") && inParms.ContainsKey("-m") &&
inParms.ContainsKey("-q");
if (b)
{
try
{
System.Int32.Parse((System.String)inParms["-p"]);
}
catch (System.FormatException e)
{
b = false;
}
}
return b;
}
/// <summary> Extract the command-line parameters and initialize the MQ variables.</summary>
/// <param name="args">
/// </param>
/// <throws> IllegalArgumentException </throws>
private void init(System.String[] args)
{
inParms = System.Collections.Hashtable.Synchronized(new System.Collections.Hashtable(14));
if (args.Length > 0 && (args.Length % 2) == 0)
{
for (int i = 0; i < args.Length; i += 2)
{
inParms[args[i]] = args[i + 1];
}
}
else
{
throw new System.ArgumentException();
}
if (allParamsPresent())
{
qManager = ((System.String)inParms["-m"]);
inputQName = ((System.String)inParms["-q"]);
qMgrProp = new Hashtable();
qMgrProp.Add(MQC.TRANSPORT_PROPERTY, MQC.TRANSPORT_MQSERIES_MANAGED);
qMgrProp.Add(MQC.HOST_NAME_PROPERTY, ((System.String)inParms["-h"]));
qMgrProp.Add(MQC.CHANNEL_PROPERTY, ((System.String)inParms["-c"]));
try
{
qMgrProp.Add(MQC.PORT_PROPERTY, System.Int32.Parse((System.String)inParms["-p"]));
}
catch (System.FormatException e)
{
qMgrProp.Add(MQC.PORT_PROPERTY, 1414);
}
if (inParms.ContainsKey("-u"))
qMgrProp.Add(MQC.USER_ID_PROPERTY, ((System.String)inParms["-u"]));
if (inParms.ContainsKey("-x"))
qMgrProp.Add(MQC.PASSWORD_PROPERTY, ((System.String)inParms["-x"]));
System.Console.Out.WriteLine("MQTest62:");
Console.WriteLine(" QMgrName ='{0}'", qManager);
Console.WriteLine(" Output QName ='{0}'", inputQName);
System.Console.Out.WriteLine("QMgr Property values:");
foreach (DictionaryEntry de in qMgrProp)
{
Console.WriteLine(" {0} = '{1}'", de.Key, de.Value);
}
}
else
{
throw new System.ArgumentException();
}
}
/// <summary> Connect, open queue, read (browse) a message, close queue and disconnect. </summary>
///
private void testReceive()
{
MQQueueManager qMgr = null;
MQQueue inQ = null;
int openOptions = MQC.MQOO_INPUT_AS_Q_DEF + MQC.MQOO_FAIL_IF_QUIESCING;
try
{
qMgr = new MQQueueManager(qManager, qMgrProp);
System.Console.Out.WriteLine("MQTest62 successfully connected to " + qManager);
inQ = qMgr.AccessQueue(inputQName, openOptions);
System.Console.Out.WriteLine("MQTest62 successfully opened " + inputQName);
testLoop(inQ);
}
catch (MQException mqex)
{
System.Console.Out.WriteLine("MQTest62 cc=" + mqex.CompletionCode + " : rc=" + mqex.ReasonCode);
}
catch (System.IO.IOException ioex)
{
System.Console.Out.WriteLine("MQTest62 ioex=" + ioex);
}
finally
{
try
{
if (inQ != null)
inQ.Close();
System.Console.Out.WriteLine("MQTest62 closed: " + inputQName);
}
catch (MQException mqex)
{
System.Console.Out.WriteLine("MQTest62 cc=" + mqex.CompletionCode + " : rc=" + mqex.ReasonCode);
}
try
{
if (qMgr != null)
qMgr.Disconnect();
System.Console.Out.WriteLine("MQTest62 disconnected from " + qManager);
}
catch (MQException mqex)
{
System.Console.Out.WriteLine("MQTest62 cc=" + mqex.CompletionCode + " : rc=" + mqex.ReasonCode);
}
}
}
private void testLoop(MQQueue inQ)
{
bool flag = true;
MQGetMessageOptions gmo = new MQGetMessageOptions();
gmo.Options |= MQC.MQGMO_WAIT | MQC.MQGMO_FAIL_IF_QUIESCING;
gmo.WaitInterval = 2500; // 2.5 seconds wait time or use MQC.MQEI_UNLIMITED to wait forever
MQMessage msg = null;
while (flag)
{
try
{
msg = new MQMessage();
inQ.Get(msg, gmo);
System.Console.Out.WriteLine("Message Data: " + msg.ReadString(msg.MessageLength));
}
catch (MQException mqex)
{
System.Console.Out.WriteLine("MQTest62 CC=" + mqex.CompletionCode + " : RC=" + mqex.ReasonCode);
if (mqex.Reason == MQC.MQRC_NO_MSG_AVAILABLE)
{
// no meesage - life is good - loop again
}
else
{
flag = false; // severe error - time to exit
}
}
catch (System.IO.IOException ioex)
{
System.Console.Out.WriteLine("MQTest62 ioex=" + ioex);
}
}
}
/// <summary> main line</summary>
/// <param name="args">
/// </param>
// [STAThread]
public static void Main(System.String[] args)
{
MQTest62 write = new MQTest62();
try
{
write.init(args);
write.testReceive();
}
catch (System.ArgumentException e)
{
System.Console.Out.WriteLine("Usage: MQTest62 -h host -p port -c channel -m QueueManagerName -q QueueName [-u userID] [-x passwd]");
System.Environment.Exit(1);
}
catch (MQException e)
{
System.Console.Out.WriteLine(e);
System.Environment.Exit(1);
}
System.Environment.Exit(0);
}
}
}