/*
*
* Copyright (c) 1999 - 2011 my-Channels Ltd
* Copyright (c) 2012 - 2019 Software AG, Darmstadt, Germany and/or Software AG USA Inc., Reston, VA, USA, and/or its subsidiaries and/or its affiliates and/or their licensors.
*
* Use, reproduction, transfer, publication or disclosure is prohibited except as specifically provided for in your License Agreement with Software AG.
*
*/
using System;
using System.Collections.Generic;
namespace com.pcbsys.nirvana.apps
{
using com.pcbsys.nirvana.client;
///
/// Subscribes to all nirvana channels within a container to demonstrate the nSession.subscribe method
///
public class sessionsubscriber : nSampleApp, nEventListener
{
private static System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
internal static long startEid = 0;
internal static string selector = null;
private DateTime startTime;
private long lastEID = 0;
private long byteCount = 0;
private int logLevel = 0;
private int count = -1;
private int totalMsgs = 0;
private int reportCount = 10000;
private static sessionsubscriber mySelf = null;
///
/// This method demonstrates the Nirvana API calls necessary to subscribe to
/// multiple channels in 1 method call. It is called after all command line arguments have been
/// received and validated
///
///
/// a String[] containing the possible RNAME values
///
/// the container within the namespace to subscribe to
///
/// the subscription selector filter
///
/// the eid to start subscribing from
///
/// the specified log level
///
/// the specified report count
///
private void doit(string[] realmDetails, string achannelName, string selector, long startEid, int loglvl, int repCount)
{
logLevel = loglvl;
reportCount = repCount;
mySelf.constructSession(realmDetails);
try
{
// get the channels within the specified container within the namespace
nChannelAttributes[] channels = mySession.getChannels(achannelName);
// Create the array of subscriber attributes objects
nSubscriptionAttributes[] attrs = new nSubscriptionAttributes[channels.Length];
for (int x = 0; x < attrs.Length; x++)
{
attrs[x] = new nSubscriptionAttributes(channels[x].getFullName(), selector, startEid, this);
}
mySession.subscribe(attrs);
List myChannels = new List();
for (int x = 0; x < attrs.Length; x++)
{
if (attrs[x].Successful)
{
Console.WriteLine("Successfully subscribed to " + attrs[x].ChannelName);
myChannels.Add(attrs[x].Channel);
}
else
{
Console.WriteLine("Failed to subscribe to " + attrs[x].ChannelName + " : " + attrs[x].Exception.Message);
Console.WriteLine(attrs[x].Exception.StackTrace);
}
}
// Stay subscribed until the user presses any key
Console.WriteLine("Press any key to quit !");
Console.Read();
Console.WriteLine("Finished. Consumed total of " + totalMsgs);
}
catch (Exception nbce)
{
Console.WriteLine("An error occured while creating the Channel Attributes object.");
Console.WriteLine(nbce.Message);
Environment.Exit(1);
}
// Close the session we opened
try
{
nSessionFactory.close(mySession);
}
catch (Exception )
{
}
// Close any other sessions within this App so that we can exit
nSessionFactory.shutdown();
}
protected override void processArgs(String[] args)
{
//
// Need a min of 2, rname, channel name
if (args.Length < 2)
{
Usage();
Environment.Exit(2);
}
String RNAME = args[0]; ;
var channelName = args[1];
var start = 0;
if (args.Length > 2)
{
start = Convert.ToInt32(args[2]);
}
var loglvl = 3;
if (args.Length > 3)
{
loglvl = Convert.ToInt32(args[3]);
}
//
// Optional Parameters
//
var report = 1000;
//Check for a selector message filter value
if (args.Length > 4)
{
report = Convert.ToInt32(args[4]);
}
String sel = null;
if (args.Length > 5)
{
sel = args[5];
}
//
// Run the sample app
//
mySelf.doit(parseRealmProperties(RNAME), channelName, sel, start, loglvl, report);
}
public static void Main(String[] args)
{
//Create an instance for this class
mySelf = new sessionsubscriber();
//Process command line arguments
mySelf.processArgs(args);
}
/**
* Prints the usage message for this class
*/
private static void Usage()
{
Console.WriteLine("Usage ...\n");
Console.WriteLine("sessionsubscriber [start eid] [debug] [count] [selector] \n");
Console.WriteLine(
" \n");
Console.WriteLine(
" - the rname of the server to connect to");
Console.WriteLine(
" - Folder name parameter for the location of the channels to subscribe to");
Console.WriteLine(
"\n[Optional Arguments] \n");
Console.WriteLine(
"[start eid] - The Event ID to start subscribing from");
Console.WriteLine(
"[debug] - The level of output from each event, 0 - none, 1 - summary, 2 - EIDs, 3 - All");
Console.WriteLine(
"[count] - The number of events to wait before printing out summary information");
Console.WriteLine(
"[selector] - The event filter string to use");
}
/**
* A callback is received by the API to this method each time an event is received from
* the nirvana channel. Be carefull not to spend too much time processing the message
* inside this method, as until it exits the next message can not be pushed.
*
* @param evt An nConsumeEvent object containing the message received from the channel
*/
public void go(nConsumeEvent evt)
{
//If this is the first message we receive
if (count == -1)
{
//Get a timestamp to be used for message rate calculations
startTime = DateTime.Now;
count = 0;
}
//Increment he counter
count++;
totalMsgs++;
//Have we reached the point where we need to report the rates?
if (count == reportCount)
{
//Reset the counter
count = 0;
//Get a timestampt to calculate the rates
DateTime end = DateTime.Now;
// Does the specified log level permits us to print on the screen?
if (logLevel >= 1)
{
//Dump the rates on the screen
if (!end.Equals(startTime))
{
TimeSpan ts = end - startTime;
double milli = ts.TotalMilliseconds;
Console.WriteLine("Received " + reportCount + " in " + (milli) + " Evt/Sec = " + ((reportCount * 1000) / (milli)) + " Bytes/sec=" + ((byteCount * 1000) / (milli)));
Console.WriteLine("Bandwidth data : Bytes Tx [" + mySession.getOutputByteCount() + "] Bytes Rx [" + mySession.getInputByteCount() + "]");
}
else
{
Console.WriteLine("Received " + reportCount + " faster than the system millisecond counter");
}
}
//Set the startTime for the next report equal to the end timestamp for the previous one
startTime = end;
//Reset the byte counter
byteCount = 0;
}
//If the last EID counter is not equal to the current event ID
if (lastEID != evt.getEventID())
{
//If yes, maybe we have missed an event, so print a message on the screen.
//This message could be printed for a number of other reasons.
//One of them would be someone purging a range creating an 'eid gap'.
//As eids are never reused within a channel you could have a situation
//where this gets printed but nothing is missed.
Console.WriteLine("Expired event range " + (lastEID) + " - " + (evt.getEventID() - 1));
//Reset the last eid counter
lastEID = evt.getEventID() + 1;
}
else
{
//Increment the last eid counter
lastEID++;
}
//Get the data of the message
byte[] buffer = evt.getEventData();
if (buffer != null)
{
//Add its length to the byte counter
byteCount += buffer.Length;
}
//If the loglevel permits printing on the screen
if (logLevel >= 2)
{
//Print the eid
Console.WriteLine("Event id : " + evt.getEventID());
if (evt.isEndOfChannel())
{
Console.WriteLine("End of channel reached");
}
//If the loglevel permits printing on the screen
if (logLevel >= 3)
{
//Print the message tag
Console.WriteLine("Event tag : " + evt.getEventTag());
//Print the message data
Console.WriteLine("Event data : " + encoding.GetString(evt.getEventData()));
if (evt.hasAttributes())
{
displayEventAttributes(evt.getAttributes());
}
nEventProperties prop = evt.getProperties();
if (prop != null)
{
displayEventProperties(prop);
}
}
}
}
} // End of sessionsubscriber Class
}