How to remove Random() function and replace by your code to generating stock data?

tuongkha

Hi all,
In StockList demo code, it has Random() function to generation stock data. Now I want to replace with my code by read a file to get stock data, after every 5 seconds it read again.

There are my code :
-----------
private void OnTimerEvent(object sender)
{
ISecurityStructReader reader;
reader = new ReadSecurityStruct("C:\\TEMP\\BACKUP08\\SECURITY.DAT");

if (reader.Open())
{
arr = reader.Read();
_stockSymbol = new string[arr.Count];

for (int i=0; i< arr.Count ;i++)
{
Struct_Security item = (Struct_Security)arr;
_stockSymbol= item.StockSymbol;
...
}
...
}

--- StockListDemo code, ExternalFeed.cs -----

public ExternalFeedSimulator() {
_stockGenerators= new Hashtable();
_snapshotQueue= new ArrayList();

_updateTimeMeans = new double [] {30000, 500, 3000, 90000,
7000, 10000, 3000, 7000,
7000, 7000, 500, 3000,
20000, 20000, 20000, 30000,
500, 3000, 90000, 7000,
10000, 3000, 7000, 7000,
7000, 500, 3000, 20000,
20000, 20000 };
...
}

------------ and here my changed -------------------

public ExternalFeedSimulator() {

_stockGenerators= new Hashtable();
_snapshotQueue= new ArrayList();

AutoResetEvent autoEvent = new AutoResetEvent(false);

TimerCallback handler = new TimerCallback(OnTimerEvent);
Timer timer = new Timer(handler, null, 1000, 5000);
}

---- StockList demo code, ExternalFeed.cs ----
public void Start() {
if (_snapshotSender != null) return;

for (int i = 0; i < 30; i++) {
string itemName= "item" + (i + 1);
ExternalFeedProducer myProducer = new ExternalFeedProducer(itemName,
_openprices, _refprices, _minprices, _maxprices,
_updateTimeMeans, _updateTimeStdDevs, _stockNames);

_stockGenerators[itemName]= myProducer;

...
}

-------- here my changed --------

public void Start() {

if (_snapshotSender != null) return;

for (int i = 0; i < 30; i++) {
string itemName= "item" + (i + 1);
ExternalFeedProducer myProducer = new ExternalFeedProducer(itemName,
_openprices, _refprices[i], _minprices[i], _maxprices[i],
_stockSymbol[i], _ceiling[i], _floor[i], _bid1[i], _bid2[i], _bid3[i], _bid1vol[i], _bid2vol[i], _bid3vol[i], _ask1[i], _ask2[i], _ask3[i], _ask1vol[1], _ask2vol[i], _ask3vol[i], _last[i], _lastVal[i], _lastVol[i], _projectOpen[i]);

_stockGenerators[itemName]= myProducer;
...
}

---- StockListDemo code, externalFeed.cs ----

public ExternalFeedProducer(string name,
double openPrice, double referPrice, double minPrice, double maxPrice,
double updateTimeMean, double updateTimeStdDev, string stockName) {
_itemName = name;
_open = (int) Math.Round(openPrice * 100);

_random = new Random();
_haveNextNextGaussian= false;
_nextNextGaussian= 0.0;

ComputeNewValues();
}

----- Here my changed ------------
public ExternalFeedProducer(string name,
double openPrice, double referPrice, double minPrice, double maxPrice,
string stockSymbol, int ceiling, double floor, int bid1, int bid2, int bid3, int bid1vol, int bid2vol, int bid3vol, int ask1, int ask2, int ask3, int ask1vol, int ask2vol, int ask3vol, int last, double lastVal, int lastVol, int projectOpen) {

_itemName = name;
_open = (int) Math.Round(openPrice / 100);
_refer = (int) Math.Round(referPrice / 100);

//_random = new Random(); --> remove Random() function here
//_haveNextNextGaussian= false;
//_nextNextGaussian= 0.0;

//ComputeNewValues();
}

-------StockListDemo code, ExternalFeed.cs ------
private void Run() {
do {
int waitMillis= ComputeNextWaitTime();
Thread.Sleep(waitMillis);

ComputeNewValues();
if (_listener != null)
_listener.OnEvent(_itemName, GetCurrentValues(false), false);

} while (true);
}

----- Here my changed -------
private void Run() {
do {
int waitMillis= ComputeNextWaitTime();
Thread.Sleep(waitMillis);

//ComputeNewValues();
if (_listener != null)
_listener.OnEvent(_itemName, GetCurrentValues(false), false);

} while (true);
}

--------------------
Now I start Lightstream server + DotNetServer, first time, it read file is ok, but after 5 seconds, it has error :

10.Jan.08 10:23:20,656 < INFO> Lightstreamer Server 3.4.6 build 1391 starting...

10.Jan.08 10:23:20,843 < INFO> Server "Lightstreamer HTTP Server" listening to *
:8080 ...
10.Jan.08 10:23:29,046 <FATAL> I/O Exception caught while reading/writing from/t
o streams: null, aborting...
java.io.EOFException
at com.lightstreamer.adapters.remote.request_reply.NotifyReceiver.run(No
tifyReceiver.java:77)
10.Jan.08 10:23:29,046 <FATAL> I/O Exception caught while reading/writing from/t
o streams: null, aborting...
java.io.EOFException
at com.lightstreamer.adapters.remote.request_reply.NotifyReceiver.run(No
tifyReceiver.java:77)
10.Jan.08 10:23:29,046 <ERROR> Failure invoked by Data Adapter
java.io.EOFException
at com.lightstreamer.adapters.remote.request_reply.NotifyReceiver.run(No
tifyReceiver.java:77)
10.Jan.08 10:23:29,046 <ERROR> Failure invoked by Data Adapter
java.io.EOFException
at com.lightstreamer.adapters.remote.request_reply.NotifyReceiver.run(No
tifyReceiver.java:77)
10.Jan.08 10:23:29,046 <FATAL> Failure in a Data Adapter
10.Jan.08 10:23:29,046 < INFO> Exiting.....
10.Jan.08 10:23:29,046 <FATAL> Failure in a Data Adapter
10.Jan.08 10:23:29,046 < INFO> Exiting.....
Press any key to continue . . .

What are my fault? Can you help me?

Dario Crivelli

The server log shows an unusual termination pattern.
First of all, the messages are repeated twice. I assume that this is due to something specific to your log4j configuration and that you are not running two Remote Data Adapters.
Moreover, it seems that the Notification socket is suddenly closed by the Remote Server, but this should not happen normally and there is no clear relation with changes on the Remote Data Adapter side.
May you please provide more details on the Remote Server life? What can you find on the Remote Server console or on the "DotNetServer.log" log file?

Dario

tuongkha

Hi Dario,
There are information in "DotNetServer.log" log file :

----------
2008-01-12 12:45:39,765 [3248] INFO Lightstreamer.DotNet.Server.ServerMain [(null)] - Lightstreamer .NET Adapter Server starting...
2008-01-12 12:45:39,828 [3248] INFO Lightstreamer.DotNet.Server.NetworkedServerStarter [(null)] - Connecting...
2008-01-12 12:45:39,843 [3248] INFO Lightstreamer.DotNet.Server.NetworkedServerStarter [(null)] - Connected
2008-01-12 12:45:39,859 [3248] INFO Lightstreamer.DotNet.Server.ServerMain [(null)] - Lightstreamer .NET Adapter Server running
2008-01-12 12:45:39,906 [2744] INFO Lightstreamer.DotNet.Server.ServerMain [(null)] - Lightstreamer .NET Adapter Server starting...
2008-01-12 12:45:39,953 [2744] INFO Lightstreamer.DotNet.Server.NetworkedServerStarter [(null)] - Connecting...
2008-01-12 12:45:39,984 [2744] INFO Lightstreamer.DotNet.Server.NetworkedServerStarter [(null)] - Connected
2008-01-12 12:45:39,984 [2744] FATAL Lightstreamer.DotNet.Server.ServerMain [(null)] - Exception caught while starting the server: Object reference not set to an instance of an object., aborting...
System.NullReferenceException: Object reference not set to an instance of an object.
at Lightstreamer.DotNet.Server.Server.Start()
at Lightstreamer.DotNet.Server.ServerMain.Main(String[] args)
2008-01-12 12:45:51,250 [1156] ERROR Lightstreamer.DotNet.Server.MetadataProviderServer [(null)] - Caught exception: Exception caught while reading from the request stream: Unable to read data from the transport connection.
Lightstreamer.DotNet.Server.RemotingException: Exception caught while reading from the request stream: Unable to read data from the transport connection. ---> System.IO.IOException: Unable to read data from the transport connection. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
--- End of inner exception stack trace ---
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at System.IO.StreamReader.ReadBuffer()
at System.IO.StreamReader.ReadLine()
at Lightstreamer.DotNet.Server.RequestReply.RequestReceiver.Run()
--- End of inner exception stack trace ---
2008-01-12 12:45:51,359 [1156] FATAL Lightstreamer.DotNet.Server.MetadataProviderServer [(null)] - Exception caught while reading/writing from/to streams: 'An existing connection was forcibly closed by the remote host', aborting...
System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)

tuongkha

Hi Dario,
There are information LS server, if i change my code :

-----
public ExternalFeedSimulator() {

_stockGenerators= new Hashtable();
_snapshotQueue= new ArrayList();

// AutoResetEvent autoEvent = new AutoResetEvent(false);

// TimerCallback handler = new TimerCallback(OnTimerEvent);
// Timer timer = new Timer(handler, null, 1000, 5000);

OnTimerEvent();
...

}

----
private void OnTimerEvent( )
{
ISecurityStructReader reader;
reader = new ReadSecurityStruct("C:\\TEMP\\BACKUP08\\SECURITY.DAT");

if (reader.Open())
{
arr = reader.Read();
_stockSymbol = new string[arr.Count];

for (int i=0; i< arr.Count ;i++)
{
Struct_Security item = (Struct_Security)arr;
_stockSymbol= item.StockSymbol;
...
}
...
}

---- LS server information --------------------

Starting Lightstreamer Server...
Please check logs for detailed information.
14.Jan.08 14:34:37,125 < INFO> Starting MAC address check
14.Jan.08 14:34:37,156 < INFO> Found MAC address 00:50:56:c0:00:08
14.Jan.08 14:34:37,156 < INFO> Found MAC address 00:50:56:c0:00:01
14.Jan.08 14:34:37,156 < INFO> Found MAC address 00:0f:b0:cd:10:6b
14.Jan.08 14:34:37,156 < INFO> Found MAC address 00:18:de:af:ea:7f
14.Jan.08 14:34:37,156 < INFO> MAC address check successful
14.Jan.08 14:34:37,156 < INFO> License correctly bound with the following parame
ter(s):
14.Jan.08 14:34:37,156 < INFO> Client ID : EWmtleTmXioln3OLeXzCL
14.Jan.08 14:34:37,156 < INFO> Mac Address : 00:18:de:af:ea:7f
14.Jan.08 14:34:37,328 < INFO> Lightstreamer Server starting in Moderato edition

14.Jan.08 14:34:37,359 < WARN> JMX management features not available with the cu
rrent license
14.Jan.08 14:34:37,390 < INFO> Started HTML Adaptor for JMX on port 6666
14.Jan.08 14:34:37,421 < INFO> Started JMXMP Connector for JMX on port 9999
14.Jan.08 14:34:37,437 < WARN> No users defined for Internal Monitor.
14.Jan.08 14:34:37,453 < INFO> Loading Metadata Provider TUTORIAL_DEMO
14.Jan.08 14:34:37,468 < INFO> Connecting...
14.Jan.08 14:34:41,406 < INFO> Connected
14.Jan.08 14:34:41,421 < INFO> Loading Data Provider TUTORIAL_DEMO
14.Jan.08 14:34:41,421 < INFO> Request sender '#1' starting...
14.Jan.08 14:34:41,421 < INFO> Reply receiver '#1' starting...
14.Jan.08 14:34:41,437 < INFO> Connecting...
14.Jan.08 14:34:50,828 < INFO> Connected
14.Jan.08 14:34:50,921 < INFO> Pump pool size set by default at 2
14.Jan.08 14:34:50,953 < INFO> Notify receiver '#2' starting...
14.Jan.08 14:34:50,953 < INFO> Request sender '#2' starting...
14.Jan.08 14:34:50,953 < INFO> Reply receiver '#2' starting...
14.Jan.08 14:34:50,968 < INFO> Events pool size set by default at 2
14.Jan.08 14:34:50,968 < INFO> Lightstreamer Server 3.4.6 build 1391 starting...

14.Jan.08 14:34:51,031 < INFO> Server "Lightstreamer HTTP Server" listening to *
:8080 ...
14.Jan.08 14:34:59,671 < INFO> Accepted HTTP connection on Lightstreamer HTTP Se
rver from 127.0.0.1:4553
14.Jan.08 14:34:59,703 < INFO> Serving request: /tutorial_demo/hose.html from 12
7.0.0.1:4553
14.Jan.08 14:34:59,734 < INFO> Reused HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4553
14.Jan.08 14:34:59,765 < INFO> Serving request: /tutorial_demo/css/table.css fro
m 127.0.0.1:4553
14.Jan.08 14:34:59,765 < INFO> Accepted HTTP connection on Lightstreamer HTTP Se
rver from 127.0.0.1:4560
14.Jan.08 14:34:59,781 < INFO> Serving request: /tutorial_demo/ls/lscommons.js f
rom 127.0.0.1:4560
14.Jan.08 14:34:59,781 < INFO> Reused HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4553
14.Jan.08 14:34:59,796 < INFO> Reused HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4560
14.Jan.08 14:34:59,843 < INFO> Serving request: /tutorial_demo/ls/lspushpage.js
from 127.0.0.1:4553
14.Jan.08 14:34:59,859 < INFO> Reused HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4553
14.Jan.08 14:35:00,531 < INFO> Serving request: /tutorial_demo/ls/lsblank.html f
rom 127.0.0.1:4560
14.Jan.08 14:35:00,531 < INFO> Reused HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4560
14.Jan.08 14:35:00,578 < INFO> Serving request: /tutorial_demo/ls/lsengine.html?
engineName=Hose&remoteDebug=false& from 127.0.0.1:4553
14.Jan.08 14:35:00,609 < INFO> Reused HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4553
14.Jan.08 14:35:00,656 < INFO> Serving request: /tutorial_demo/ls/lscommons.js f
rom 127.0.0.1:4553
14.Jan.08 14:35:00,671 < INFO> Reused HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4553
14.Jan.08 14:35:00,703 < INFO> Serving request: /tutorial_demo/ls/lsengine.js?13
28 from 127.0.0.1:4553
14.Jan.08 14:35:00,703 < INFO> Reused HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4553
14.Jan.08 14:35:00,781 < INFO> Closed HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4560
14.Jan.08 14:35:00,828 < INFO> Serving request: /tutorial_demo/ls/lsblank.html f
rom 127.0.0.1:4553
14.Jan.08 14:35:00,828 < INFO> Reused HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4553
14.Jan.08 14:35:00,828 < INFO> Accepted HTTP connection on Lightstreamer HTTP Se
rver from 127.0.0.1:4563
14.Jan.08 14:35:00,843 < INFO> Serving request: /tutorial_demo/ls/lsblank.html f
rom 127.0.0.1:4563
14.Jan.08 14:35:00,843 < INFO> Serving request: /tutorial_demo/ls/lsblank.html f
rom 127.0.0.1:4553
14.Jan.08 14:35:00,843 < INFO> Reused HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4563
14.Jan.08 14:35:00,843 < INFO> Reused HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4553
14.Jan.08 14:35:00,859 < INFO> Accepted HTTP connection on Lightstreamer HTTP Se
rver from 127.0.0.1:4566
14.Jan.08 14:35:00,875 < INFO> Serving request: /tutorial_demo/ls/lsblank.html f
rom 127.0.0.1:4563
14.Jan.08 14:35:00,875 < INFO> Serving request: /tutorial_demo/ls/lsform.html fr
om 127.0.0.1:4566
14.Jan.08 14:35:00,875 < INFO> Reused HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4563
14.Jan.08 14:35:00,875 < INFO> Reused HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4566
14.Jan.08 14:35:00,875 < INFO> Serving request: /tutorial_demo/ls/lsblank.html f
rom 127.0.0.1:4553
14.Jan.08 14:35:00,890 < INFO> Reused HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4553
14.Jan.08 14:35:01,171 < INFO> Serving request: /lightstreamer/STREAMING_IN_PROG
RESS?LS_phase=6802&LS_client_version=4.2&LS_adapter=TUTORIAL_DEMO& from 127.0.0.
1:4566
14.Jan.08 14:35:01,218 <TRACE> Pump for session S-1684810439N1 added
14.Jan.08 14:35:01,234 < INFO> Starting new session: S-1684810439N1 from 127.0.0
.1:4566
14.Jan.08 14:35:03,234 <TRACE> Sending probe in session S-1684810439N1
14.Jan.08 14:35:03,750 < INFO> Reused HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4553
14.Jan.08 14:35:03,843 < INFO> Serving request: /lightstreamer/control.html?LS_s
ession=S-1684810439N1&LS_window=0&LS_win_phase=5&LS_op=add&LS_req_phase=42&LS_mo
de1=MERGE&LS_id1=item1%20item2%20item3%20item4%20item5%20item6%20item7%20item8%2
0item9%20item10%20item11%20item12%20item13%20item14%20item15%20item16%20item17%2
0item18%20item19%20item20%20item21%20item22%20item23%20item24%20item25%20item26%
20item27%20item28%20item29%20item30&LS_schema1=last_price%20time%20pct_change%20
bid1%20bid2%20bid3%20bid1vol%20bid2vol%20bid3vol%20ask1%20ask2%20ask3%20ask1vol%
20ask2vol%20ask3vol%20min%20max%20ref_price%20open_price%20stock_name%20ceiling%
20floor%20lastVal%20lastVol%20close_price%20close_vol&LS_snapshot1=true&LS_reque
sted_max_frequency1=1&LS_unique=1 from 127.0.0.1:4563
14.Jan.08 14:35:03,843 < INFO> Controlling session: S-1684810439N1 from 127.0.0.
1:4563
14.Jan.08 14:35:03,906 <TRACE> Pumping event in session S-1684810439N1: c(6,5,0)
;setWin(0,5);
14.Jan.08 14:35:03,906 < INFO> Reused HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4563
14.Jan.08 14:35:04,109 <TRACE> Pumping event in session S-1684810439N1: z(0,1,3,
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14.Jan.08 14:35:04,109 <TRACE> Pumping event in session S-1684810439N1: z(0,1,9,
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14.Jan.08 14:35:04,109 <TRACE> Pumping event in session S-1684810439N1: z(0,1,18
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14.Jan.08 14:35:04,125 <TRACE> Pumping event in session S-1684810439N1: z(0,1,25
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"56","54","DIC ","58","53.5","244","456","53","456");z(0,1,26,"36","#","-1.9"
,"0","0","0","0","0","0","37","37","39","40","30","700","36.7","37.5","39","37",
"DNP ","40","36.7","488","1,318","36","1,318");z(0,1,28,"66","#","-2","66","6
6","65","1,755","10,662","20,032","67","67","68","40","4,209","29,885","66.5","6
9","68","66","DPM ","71","65.5","38,369","56,745","66","56,745");z(0,1,29,"79
","#","-2","79","78","78","961","201","1,330","79","80","80","40","2,117","60","
79","80.5","81","79","DPR ","85","77","7,637","9,600","79","9,600");z(0,1,30,
"122","#","0","120","0","0","17","0","0","122","123","124","40","299","79","122"
,"123","122","122","DRC ","128","116","7,132","5,846","122","5,846");
14.Jan.08 14:35:04,640 < INFO> Serving request: /tutorial_demo/ls/lsblank.html f
rom 127.0.0.1:4553
14.Jan.08 14:35:04,640 < INFO> Reused HTTP connection on Lightstreamer HTTP Serv
er from 127.0.0.1:4553
14.Jan.08 14:35:06,125 <TRACE> Sending probe in session S-1684810439N1
14.Jan.08 14:35:08,125 <TRACE> Sending probe in session S-1684810439N1

----- DotNetServer.log --------
2008-01-14 14:34:39,656 [1512] INFO Lightstreamer.DotNet.Server.ServerMain [(null)] - Lightstreamer .NET Adapter Server starting...
2008-01-14 14:34:39,781 [4620] INFO Lightstreamer.DotNet.Server.ServerMain [(null)] - Lightstreamer .NET Adapter Server starting...
2008-01-14 14:34:40,796 [1512] WARN Lightstreamer.DotNet.Server.NetworkedServerStarter [(null)] - Connection failed, retrying in 10 seconds...
2008-01-14 14:34:40,812 [4620] INFO Lightstreamer.DotNet.Server.NetworkedServerStarter [(null)] - Connecting...
2008-01-14 14:34:41,421 [4620] INFO Lightstreamer.DotNet.Server.NetworkedServerStarter [(null)] - Connected
2008-01-14 14:34:42,437 [4620] INFO Lightstreamer.DotNet.Server.ServerMain [(null)] - Lightstreamer .NET Adapter Server running
2008-01-14 14:34:50,812 [1512] INFO Lightstreamer.DotNet.Server.NetworkedServerStarter [(null)] - Connecting...
2008-01-14 14:34:50,828 [1512] INFO Lightstreamer.DotNet.Server.NetworkedServerStarter [(null)] - Connected
2008-01-14 14:34:50,859 [1512] INFO Lightstreamer.DotNet.Server.ServerMain [(null)] - Lightstreamer .NET Adapter Server running

-----------------

I'm a beginner, so i don't know how to fix this issue? I'm waiting your response can u help me? If u can, please give me your email, i will send my code to you.

Thanks!

Dario Crivelli

I can't see any issue in the log; just a couple of warning messages which should not be important in this case. Note that some "Connection failed" warning in the Remote Adapter log is normal in the startup phase.
Moreover, the log shows that updates are being sent to the client.
May you please clarify what is wrong in the demo behaviour at the moment?
Dario

tuongkha

Hi Dario,
I know you haven't time to see my code, but please help me.

Here my code before it has error :
[url]ftp://tuongkha.servebeer.com/StockListDemo.rar[/url]

Here my code after i changed and it has error :
[url]ftp://tuongkha.servebeer.com/StockListDemo_error.rar[/url]

user name + password ftp server : tuongkha
password to unrar : tuongkha

-------
Extract into a folder. After that,
- copy folder "pages\tutorial_demo" into "C:\Lightstreamer\pages".
- copy folder "adapters\StockList_sockets" into "C:\Lightstreamer\adapters"
- copy folder "backup14" into "c:\temp"
- copy folder "Deployment_DotNet_Server" into "C:\Lightstreamer\DOCS-SDKs\sdk_adapter_dotnet\examples\DotNetStockListDemo\Deployment\Deployment_DotNet_Server".

Now start LS + DotNetserver.bat, type http://localhost:8080/tutorial_demo/hose.html, you will see my error.

I mean in your StockListDemo code, how to remove Random() function in ExternalFeedProducer () class and replace another function (my function) to generating stock data every 5 seconds?

What are your code i need to remove and replace from StockListdemo code?