/* * * Copyright (c) 1999 - 2011 my-Channels Ltd * Copyright (c) 2012 - 2017 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.Threading; using com.pcbsys.nirvana.client; namespace com.pcbsys.nirvana.apps { /** * Uses a channel iterator to consume events from a nirvana channel. * * This is a synchronous method of event retrieval */ class channeliterator : nSampleApp { private static System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding(); private long lastEID = 0; private DateTime startTime; private long byteCount = 0; private int logLevel = 0; private int count = -1; private int totalMsgs = 0; private int reportCount = 1000; private nChannel myChannel; private nChannelIterator iterator = null; private Thread channelReader = null; private static channeliterator mySelf = null; /** * This method demonstrates the Nirvana API calls necessary to consume * events from a channel using a channel iterator * * It is called after all command line arguments have been received and * validated * * @param realmDetails a String[] containing the possible RNAME values * @param achannelName the channel name to create * @param selector the subscription selector filter * @param startEid the eid to start subscribing from * @param loglvl the specified log level * @param repCount the specified report count */ private void doit(String[] realmDetails, String achannelName, String sel, long start, int loglvl, int repCount) { logLevel = loglvl; reportCount = repCount; mySelf.constructSession(realmDetails); //Creates the iterator on specified channel try { //Create a channel attributes object nChannelAttributes nca = new nChannelAttributes(); nca.setName(achannelName); //Obtain the channel reference myChannel = mySession.findChannel(nca); //if the latest event has been implied (by specifying -1) if (start == -1) { //Get the last eid on the channel and reset the start eid with that value start = myChannel.getLastEID() + 1; } //create the channel iterator object and the read thread iterator = myChannel.createIterator(sel, start); ThreadStart ts = new ThreadStart(run); channelReader = new Thread(ts); channelReader.IsBackground = true; channelReader.Start(); channelReader.Name = "IteratorReadThread"; //Stay subscribed until the user presses any key Console.WriteLine("Press any key to quit !"); try { Console.ReadLine(); } catch (Exception ) { } //Ignore this Console.WriteLine("Finished. Consumed total of " + totalMsgs); iterator.close(); } //Handle errors catch (nChannelNotFoundException ) { Console.WriteLine("The channel specified could not be found."); Console.WriteLine("Please ensure that the channel exists in the REALM you connect to."); Environment.Exit(1); } catch (nSecurityException ) { Console.WriteLine("Unsufficient permissions for the requested operation."); Console.WriteLine("Please check the ACL settings on the server."); Environment.Exit(1); } catch (nSessionNotConnectedException ) { Console.WriteLine("The session object used is not physically connected to the Nirvana Realm."); Console.WriteLine("Please ensure the realm is running and check your RNAME value."); Environment.Exit(1); } catch (nUnexpectedResponseException ) { Console.WriteLine("The Nirvana REALM has returned an unexpected response."); Console.WriteLine("Please ensure the Nirvana REALM and client API used are compatible."); Environment.Exit(1); } catch (nUnknownRemoteRealmException ) { Console.WriteLine("The channel specified resided in a remote realm which could not be found."); Console.WriteLine("Please ensure the channel name specified is correct."); Environment.Exit(1); } catch (nRequestTimedOutException ) { Console.WriteLine("The requested operation has timed out waiting for a response from the REALM."); Console.WriteLine("If this is a very busy REALM ask your administrator to increase the client timeout values."); Environment.Exit(1); } catch (nBaseClientException ) { Console.WriteLine("An error occured while creating the Channel Attributes object."); Environment.Exit(1); } //Close the session we opened try { nSessionFactory.close(mySession); } catch (Exception ) { } //Close any other sessions so that we can exit nSessionFactory.shutdown(); } public void run() { while (true) { try { nConsumeEvent evt = iterator.getNext(-1); if (evt != null) { go(evt); } } catch (nRequestTimedOutException ) { // no event to consume } catch (Exception ) { break; } } } /** * Prints the usage message for this class */ private static void Usage() { Console.WriteLine("Usage ...\n"); Console.WriteLine("channeliterator [start eid] [debug] [count] [selector] \n"); Console.WriteLine( " \n"); Console.WriteLine( " - the rname of the server to connect to"); Console.WriteLine( " - Channel name parameter for the channel 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"); } 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]); } var report = 1000; 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); } static void Main(string[] args) { //Create an instance for this class mySelf = new channeliterator(); //Process command line arguments mySelf.processArgs(args); } /** * 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 timestamp to calculate the rates DateTime end = DateTime.Now; // Does the specified log level permit us to print on the screen? if (logLevel >= 1) { //Dump the rates on the screen if (!end.Equals(startTime)) { TimeSpan ts = end - startTime; Console.WriteLine("Received " + reportCount + " in " + (ts.Milliseconds) + " Evt/Sec = " + ((reportCount * 1000) / (ts.Milliseconds)) + " Bytes/sec=" + ((byteCount * 1000) / (ts.Milliseconds))); 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); } } } } } }