package nl.tno.imb;
   
   import nl.tno.imb.TEventEntry;
   
   import java.io.InputStream;
   import java.io.OutputStream;
   import java.util.Arrays;
   import java.io.IOException;
   import java.net.Socket;
  import java.net.SocketException;
  
  
  /**The connection to the framework and starting point to use IMB.
   * All further actions are started through a new object of this class.
   * Main actions are:<br>
   * subscribe to events to receive events<br>
   * publish events to send events (called signal). if autoPublish is true you start sending events immediately<br>
   * set global framework variables<br>
   * send streams over the framework<br>
   * set/update the current status for the connected client<br>
   * optionally define the owner (specific: connected model name and id)<br>
   * optionally set specific socket and connection options<br>
   * <br>
   * Subscribe and publish return TEventEntry objects that can be used to set handlers for receiving specific events.<br>
   * Default a reading thread is started to handle all socket reading. The thread calls registered event handlers for the received events.<br>
   * 
   *  
   * @author hans.cornelissen@tno.nl
   */
  public class TConnection {
  
      // constructors
      /**Create an IMB connection to the framework
       * @param aRemoteHost IP address or DNS name of the IMB hub to connect to
       * @param aRemotePort TCP port of the IMB hub to connect to
       * @param aOwnerName optional description of the connecting client
       * @param aOwnerID optional id of the connecting client 
       * @param aFederation federation to connect with; this is default prefixed to subscribed and published event names 
       */
      public TConnection(String aRemoteHost, int aRemotePort, String aOwnerName, int aOwnerID, String aFederation) {
          this(aRemoteHost, aRemotePort, aOwnerName, aOwnerID, aFederation, true);
      }
  
      /**Create an IMB connection to the framework
       * @param aRemoteHost IP address or DNS name of the IMB hub to connect to
       * @param aRemotePort TCP port of the IMB hub to connect to
       * @param aOwnerName optional description of the connecting client
       * @param aOwnerID optional id of the connecting client 
       * @param aFederation federation to connect with; this is default prefixed to subscribed and published event names
       * @param aStartReadingThread use an internal reader thread for processing events and commands from the connected hub
       */
      public TConnection(String aRemoteHost, int aRemotePort, String aOwnerName, int aOwnerID, String aFederation,
              boolean aStartReadingThread) {
          ffederation = aFederation;
          fownerName = aOwnerName;
          fownerID = aOwnerID;
          open(aRemoteHost, aRemotePort, aStartReadingThread);
      }
      
      // destructor
      protected void finalize() {
          close();
      }
  
      // internals/privates
      
      /** event id's on the hub are different from local id's. this list is used to translate incoming hub event id's */
      private class TEventTranslation {
          public final static int INVALID_TRANSLATED_EVENT_ID = -1;
  
          private int[] feventTranslation;
  
          public TEventTranslation() {
              feventTranslation = new int[32];
              // mark all entries as invalid
              for (int i = 0; i < feventTranslation.length; i++)
                  feventTranslation[i] = INVALID_TRANSLATED_EVENT_ID;
          }
  
          public int getTranslateEventID(int aRxEventID) {
              if ((0 <= aRxEventID) && (aRxEventID < feventTranslation.length))
                  return feventTranslation[aRxEventID];
              else
                  return INVALID_TRANSLATED_EVENT_ID;
          }
  
          public void setEventTranslation(int aRxEventID, int aTxEventID) {
              if (aRxEventID >= 0) {
                  // grow event translation list until it can contain the
                  // requested id
                  while (aRxEventID >= feventTranslation.length) {
                      int FormerSize = feventTranslation.length;
                      // resize event translation array to double the size
                      feventTranslation = Arrays.copyOf(feventTranslation, feventTranslation.length * 2);
                      // mark all new entries as invalid
                      for (int i = FormerSize; i < feventTranslation.length; i++)
                          feventTranslation[i] = INVALID_TRANSLATED_EVENT_ID;
                  }
                  feventTranslation[aRxEventID] = aTxEventID;
             }
         }
     }
 
     /** internal list of all local events */
     private class TEventEntryList {
         
         TEventEntryList(int aInitialSize) {
             FCount = 0;
             fevents = new TEventEntry[aInitialSize];
         }
 
         private TEventEntry[] fevents;
         private int FCount = 0;
 
         public TEventEntry getEventEntry(int aEventID) {
             if (0 <= aEventID && aEventID < FCount)
                 return fevents[aEventID];
             else
                 return null;
         }
 
         public String getEventName(int aEventID) {
             if (0 <= aEventID && aEventID < FCount) {
                 if (fevents[aEventID] != null)
                     return fevents[aEventID].getEventName();
                 else
                     return null;
             } else
                 return "";
         }
 
         public TEventEntry addEvent(TConnection aConnection, String aEventName) {
             FCount++;
             if (FCount>fevents.length)
                 fevents = Arrays.copyOf(fevents, fevents.length * 2);
             fevents[FCount - 1] = new TEventEntry(aConnection, FCount - 1, aEventName);
 
             return fevents[FCount - 1];
         }
 
         public TEventEntry getEventEntryOnName(String aEventName) {
             int i = FCount - 1;
             while (i >= 0 && !getEventName(i).equals(aEventName))
                 i--;
             if (i >= 0)
                 return fevents[i];
             else
                 return null;
         }
     }
     // TODO: description
     public static final String EVENT_FILTER_POST_FIX = "*";
     /** postfix of the variable name for the model status */
     private static final String MODEL_Status_VAR_NAME = "ModelStatus";
     /** separator char for the postfix of the variable name for the model status */
     private static final String MODEL_STATUS_VAR_SEP_CHAR = "|";
     // constants
     /**magic bytes to identify the start of a valid IMB packet */
     public static final byte[] MAGIC_BYTES = new byte[] {
             0x2F, 0x47, 0x61, 0x71, (byte) 0x95, (byte) 0xAD, (byte) 0xC5, (byte) 0xFB
     };
     // private static final long MagicBytesInt64 = 0xFBC5AD957161472FL;
     /**magic bytes to identify the end of the payload on a valid IMB packet (as 32 bit integer)*/
     private static final int MAGIC_STRING_CHECK_INT32 = 0x10F13467;
     /**magic bytes to identify the end of the payload on a valid IMB packet (as array of bytes)*/
     public static final byte[] MAGIC_STRING_CHECK = new byte[] {
             0x67, 0x34, (byte) 0xF1, 0x10
     };
     // fields
     /** TCP Socket the connection is based on */
     private Socket fsocket = null;
     /** output stream linked to the socket */
     private OutputStream foutputStream = null;
     /** input stream linked to the socket */
     private InputStream finputStream = null;
     /** address the socket is connected to */
     private String fremoteHost = "";
     /** TCP port the socket is connected to */
     private int fremotePort = 0;
     /** optional reader thread */
     private Thread freadingThread = null;
     /** event id's on the hub are different from local id's. this list is used to translate incoming hub event id's */
     private TEventTranslation feventTranslation = new TEventTranslation();
     /** internal list of all local events */
     private TEventEntryList feventEntryList = new TEventEntryList(8);
     /** active federation */
     private String ffederation = DEFAULT_FEDERATION;
     // standard event references
     private static final String FOCUS_EVENT_NAME = "Focus";
     private TEventEntry ffocusEvent = null;
     private static final String CHANGE_FEDERATION_EVENT_NAME = "META_CurrentSession";
     private TEventEntry fchangeFederationEvent = null;
     private TEventEntry flogEvent = null;
     // broker time
     // private long fbrokerAbsoluteTime = 0;
     // private int fbrokerTick = 0;
     // private int fbrokerTickDelta = 0;
     private int funiqueClientID = 0;
     private int fclientHandle = 0;
     private int fownerID = 0;
     private String fownerName = "";
 
     private TEventEntry eventIDToEventL(int aEventID) {
         synchronized (feventEntryList) {
             return feventEntryList.getEventEntry(aEventID);
         }
     }
 
     private TEventEntry addEvent(String aEventName) {
         int EventID = 0;
         TEventEntry Event;
         while (EventID < feventEntryList.FCount && !feventEntryList.getEventEntry(EventID).isEmpty())
             EventID += 1;
         if (EventID < feventEntryList.FCount) {
             Event = feventEntryList.getEventEntry(EventID);
             Event.feventName = aEventName;
             Event.fparent = null;
         } else
             Event = feventEntryList.addEvent(this, aEventName);
         return Event;
     }
     
     private TEventEntry addEventL(String aEventName) {
         TEventEntry Event;
         synchronized (feventEntryList) {
             Event = addEvent(aEventName);
         }
         return Event;
     }
     
     private TEventEntry findOrAddEventL(String aEventName) {
         synchronized (feventEntryList) {
             TEventEntry Event = feventEntryList.getEventEntryOnName(aEventName);
             if (Event == null) {
                 int EventID = 0;
                 while (EventID < feventEntryList.FCount && !feventEntryList.getEventEntry(EventID).isEmpty())
                     EventID += 1;
                 if (EventID < feventEntryList.FCount) {
                     Event = feventEntryList.getEventEntry(EventID);
                     Event.feventName = aEventName;
                 } else
                     Event = feventEntryList.addEvent(this, aEventName);
             }
             return Event;
         }
     }
 
     private TEventEntry findEventL(String aEventName) {
         synchronized (feventEntryList) {
             return feventEntryList.getEventEntryOnName(aEventName);
         }
     }
 
     private TEventEntry findEventParentL(String aEventName) {
         String ParentEventName;
         String EventName;
         ParentEventName = "";
         TEventEntry Event = null;
         synchronized (feventEntryList) {
             for (int EventID = 0; EventID<feventEntryList.FCount; EventID++)
             {
                 EventName = feventEntryList.getEventName(EventID);
                 if (EventName.endsWith(EVENT_FILTER_POST_FIX))
                 {
                     EventName = EventName.substring(0, EventName.length()-2);
                     if (aEventName.startsWith(EventName))
                     {
                         if (ParentEventName.length()<EventName.length())
                         {
                             Event = feventEntryList.getEventEntry(EventID);
                             ParentEventName = EventName;
                         }
                     }
                 }
             }
             return Event;
         }
     }
 
     private TEventEntry findEventAutoPublishL(String aEventName) {
         TEventEntry Event = findEventL(aEventName);
         if (Event == null && autoPublish)
             Event = publish(aEventName, false);
         return Event;
     }
 
     private int readBytesFromNetStream(TByteBuffer aBuffer) {
         try {
             int Count = 0;
             int NumBytesRead = -1;
             while (aBuffer.getwriteAvailable() > 0 && NumBytesRead != 0) {
                 NumBytesRead = finputStream.read(aBuffer.getBuffer(), aBuffer.getWriteCursor(), aBuffer.getwriteAvailable());
                 aBuffer.written(NumBytesRead);
                 Count += NumBytesRead;
             }
             return Count;
         } catch (IOException ex) {
             return 0; // signal connection error
         }
     }
 
     // function returns payload of command, fills found command and returns
     // problems during read in result
     // commandmagic + command + payloadsize [ + payload + payloadmagic]
     private int readCommand(TByteBuffer aFixedCommandPart, TByteBuffer aPayload, TByteBuffer aPayloadCheck)
             throws IOException {
         int NumBytesRead = finputStream.read(aFixedCommandPart.getBuffer(), 0, aFixedCommandPart.getLength());
         if (NumBytesRead > 0) {
             while (!aFixedCommandPart.compare(MAGIC_BYTES, 0)) {
                 int rbr = finputStream.read();
                 // skipped bytes because of invalid magic in read command
                 if (rbr != -1)
                     aFixedCommandPart.shiftLeftOneByte((byte) rbr);
                 else
                     return TEventEntry.IC_END_OF_SESSION;
             }
             // we found the magic in the stream
             int aCommand = aFixedCommandPart.peekInt32(MAGIC_BYTES.length);
             int PayloadSize = aFixedCommandPart.peekInt32(MAGIC_BYTES.length + TByteBuffer.SIZE_OF_INT32);
             if (PayloadSize <= MAX_PAYLOAD_SIZE) {
                 aPayload.clear(PayloadSize);
                 if (PayloadSize > 0) {
                     int Len = readBytesFromNetStream(aPayload);
                     if (Len == aPayload.getLength()) {
                         NumBytesRead = finputStream.read(aPayloadCheck.getBuffer(), 0, aPayloadCheck.getLength());
                         if (NumBytesRead == TByteBuffer.SIZE_OF_INT32 && aPayloadCheck.compare(MAGIC_STRING_CHECK, 0))
                             return aCommand;
                         else
                             return TEventEntry.IC_INVALID_COMMAND;
                     } else
                         // error, payload size mismatch
                         return TEventEntry.IC_INVALID_COMMAND;
                 } else
                     return aCommand; // OK, no payload
             } else
                 return TEventEntry.IC_INVALID_COMMAND; // error, payload is over max size
         } else
             return TEventEntry.IC_END_OF_SESSION; // error, no valid connection
     }
 
     /** place holder for the Lock for writing commands to the framework */
     private Integer fwiteCommandLock = new Integer(0);
 
     /**Write a single command to the framework
      * @param aCommand
      * @param aPayload
      * @return see ICE_* constants
      */
     protected int writeCommand(int aCommand, byte[] aPayload)
     {
         synchronized (fwiteCommandLock) {
             TByteBuffer Buffer = new TByteBuffer();
 
             Buffer.prepare(MAGIC_BYTES);
             Buffer.prepare(aCommand);
 
             if ((aPayload != null) && (aPayload.length > 0)) {
                 Buffer.prepare(aPayload.length);
                 Buffer.prepare(aPayload);
                 Buffer.prepare(MAGIC_STRING_CHECK_INT32);
             } else
                 Buffer.prepare((int) 0); // payload size=0
             Buffer.prepareApply();
             Buffer.qWrite(MAGIC_BYTES);
             Buffer.qWrite(aCommand);
             if ((aPayload != null) && (aPayload.length > 0)) {
                 Buffer.qWrite(aPayload.length);
                 Buffer.qWrite(aPayload);
                 Buffer.qWrite(MAGIC_STRING_CHECK_INT32);
             } else
                 Buffer.qWrite((int) 0);
             // send buffer over socket
             if (isConnected()) {
                 try {
                     foutputStream.write(Buffer.getBuffer(), 0, Buffer.getLength());
                     return Buffer.getLength();
                 } catch (Exception ex) {
                     close();
                     return ICE_CONNECTION_CLOSED;
                 }
             } else {
                 return ICE_CONNECTION_CLOSED;
             }
         }
     }
 
     protected String prefixFederation(String aName) {
         return prefixFederation(aName, true);
     }
 
     protected String prefixFederation(String aName, boolean aUseFederationPrefix) {
         if (!ffederation.equals("") && aUseFederationPrefix)
             return ffederation + "." + aName;
         else
             return aName;
     }
 
     /**Main framework command dispatcher
      * @param aCommand
      * @param aPayload
      */
     private void handleCommand(int aCommand, TByteBuffer aPayload) {
         switch (aCommand) {
         case TEventEntry.IC_EVENT:
             handleCommandEvent(aPayload);
             break;
         case TEventEntry.IC_SET_VARIABLE:
             handleCommandVariable(aPayload);
             break;
         case TEventEntry.IC_SET_EVENT_ID_TRANSLATION:
             feventTranslation.setEventTranslation(aPayload.peekInt32(0, TEventTranslation.INVALID_TRANSLATED_EVENT_ID),
                     aPayload.peekInt32(TByteBuffer.SIZE_OF_INT32, TEventTranslation.INVALID_TRANSLATED_EVENT_ID));
             break;
         case TEventEntry.IC_UNIQUE_CLIENT_ID:
             funiqueClientID = aPayload.readInt32();
             fclientHandle = aPayload.readInt32();
             break;
         /*
         case icTimeStamp:
             // ignore for now, only when using and syncing local time (we trust hub time for now)
             fbrokerAbsoluteTime = aPayload.ReadInt64();
             fbrokerTick = aPayload.ReadInt32();
             fbrokerTickDelta = aPayload.ReadInt32();
             break;
         */
         case TEventEntry.IC_EVENT_NAMES:
             handleCommandEventNames(aPayload);
             break;
         case TEventEntry.IC_END_OF_SESSION:
             close();
             break;
         case TEventEntry.IC_SUBSCRIBE:
         case TEventEntry.IC_PUBLISH:
         case TEventEntry.IC_UNSUBSCRIBE:
         case TEventEntry.IC_UNPUBLISH:
             handleSubAndPub(aCommand, aPayload);
             break;
         default:
             handleCommandOther(aCommand, aPayload);
             break;
         }
     }
 
     private void handleCommandEvent(TByteBuffer aPayload) {
         int TxEventID = feventTranslation.getTranslateEventID(aPayload.readInt32());
         if (TxEventID != TEventTranslation.INVALID_TRANSLATED_EVENT_ID)
             eventIDToEventL(TxEventID).handleEvent(aPayload);
     }
 
     private void handleCommandVariable(TByteBuffer aPayload) {
         if (onVariable != null || onStatusUpdate != null) {
             String VarName = aPayload.readString();
             // check if it is a status update
             // TODO: model name is prefixed by federation. Is this correct?
             if (VarName.toUpperCase().endsWith(MODEL_STATUS_VAR_SEP_CHAR + MODEL_Status_VAR_NAME.toUpperCase())) {
                 VarName = VarName.substring(0, VarName.length() - (MODEL_STATUS_VAR_SEP_CHAR.length() + MODEL_Status_VAR_NAME.length()));
                 String ModelName = VarName.substring(8, VarName.length());
                 String ModelUniqueClientID = VarName.substring(0, 8);
                 aPayload.readInt32();
                 int Status = aPayload.readInt32(-1);
                 int Progress = aPayload.readInt32(-1);
                 if (onStatusUpdate != null)
                     onStatusUpdate.dispatch(this, ModelUniqueClientID, ModelName, Progress, Status);
             } else {
                 TByteBuffer VarValue = aPayload.readByteBuffer();
                 TByteBuffer PrevValue = new TByteBuffer();
                 if (onVariable != null)
                     onVariable.dispatch(this, VarName, VarValue.getBuffer(), PrevValue.getBuffer());
             }
         }
     }
 
     private void handleCommandEventNames(TByteBuffer aPayload) {
         if (onEventNames != null) {
             int ec = aPayload.readInt32();
             TEventNameEntry[] EventNames = new TEventNameEntry[ec];
             for (int en = 0; en < EventNames.length; en++) {
                 EventNames[en] = new TEventNameEntry();
                 EventNames[en].eventName = aPayload.readString();
                 EventNames[en].publishers = aPayload.readInt32();
                 EventNames[en].subscribers = aPayload.readInt32();
                 EventNames[en].timers = aPayload.readInt32();
             }
             onEventNames.dispatch(this, EventNames);
         }
     }
 
     private void handleSubAndPub(int aCommand, TByteBuffer aPayload) {
         String EventName;
         TEventEntry EE;
         TEventEntry EP;
         switch (aCommand) {
         case TEventEntry.IC_SUBSCRIBE:
         case TEventEntry.IC_PUBLISH:
             aPayload.readInt32(); // event id
             aPayload.readInt32(); //  event entry type
             EventName = aPayload.readString();
             EE = findEventL(EventName);
             if (EE == null)
             {
                 // find parent
                 EP = findEventParentL(EventName);
                 if (EP != null)
                 {
                     EE = addEventL(EventName);
                     EE.fparent = EP;
                     EE.copyHandlersFrom(EP);
                 }
             }
             else
             {
                 if ((onSubAndPub !=null) && !EE.isEmpty())
                     onSubAndPub.dispatch(this, aCommand, EventName);
                 
             }
             if (EE != null)
                 EE.handleSubAndPub(aCommand);
             break;
         case TEventEntry.IC_UNSUBSCRIBE:
         case TEventEntry.IC_UNPUBLISH:
             EventName = aPayload.readString();
             if (onSubAndPub !=null)
                 onSubAndPub.dispatch(this, aCommand, EventName);
             EE = findEventL(EventName);
             if (EE != null)
                 EE.handleSubAndPub(aCommand);
             break;
         }
     }
     
     protected void handleCommandOther(int aCommand, TByteBuffer aPayload) {
         // override to implement protocol extensions
     }
 
     private int requestUniqueClientID() {
         TByteBuffer Payload = new TByteBuffer();
         Payload.prepare((int) 0);
         Payload.prepare((int) 0);
         Payload.prepareApply();
         Payload.qWrite((int) 0);
         Payload.qWrite((int) 0);
         return writeCommand(TEventEntry.IC_UNIQUE_CLIENT_ID, Payload.getBuffer());
     }
 
     private int setOwner() {
         if (isConnected()) {
             TByteBuffer Payload = new TByteBuffer();
             Payload.prepare(fownerID);
             Payload.prepare(fownerName);
             Payload.prepareApply();
             Payload.qWrite(fownerID);
             Payload.qWrite(fownerName);
             return writeCommand(TEventEntry.IC_SET_CLIENT_INFO, Payload.getBuffer());
         } else
             return ICE_CONNECTION_CLOSED;
     }
 
     private void readCommands() {
         // TODO: more like Delphi code
         int Command = TEventEntry.IC_INVALID_COMMAND;
         // define once
         // magic + command + payload size
         TByteBuffer FixedCommandPart = new TByteBuffer(MAGIC_BYTES.length + TByteBuffer.SIZE_OF_INT32
                 + TByteBuffer.SIZE_OF_INT32);
         TByteBuffer Payload = new TByteBuffer();
         TByteBuffer PayloadCheck = new TByteBuffer(TByteBuffer.SIZE_OF_INT32);
         do {
             try {
                 try {
                     Command = readCommand(FixedCommandPart, Payload, PayloadCheck);
                     if (Command != TEventEntry.IC_INVALID_COMMAND)
                         handleCommand(Command, Payload);
                 } catch (ThreadDeath ex) {
                     Command = TEventEntry.IC_END_OF_SESSION;
                 }
             } catch (Exception ex) {
                 if (isConnected())
                     System.out.println("## Exception in ReadCommands loop: " + ex.getMessage());
             }
         } while ((Command != TEventEntry.IC_END_OF_SESSION) && isConnected());
     }
 
     
     protected enum TConnectionState {
         icsUninitialized(0),
         icsInitialized(1),
         icsClient(2),
         icsHub(3),
         icsEnded(4),
         // room for extensions ..
         // gateway values are used over network and should be same over all connected clients/brokers
         icsGateway(100), // equal
         icsGatewayClient(101), // this gateway acts as a client; subscribes are not received
         icsGatewayServer(102); // this gateway treats connected broker as client
 
         public final int value;
 
         TConnectionState(int aValue) {
             value = aValue;
         }
     }
 
     protected void setState(TConnectionState aState) {
         TByteBuffer Payload = new TByteBuffer();
         Payload.prepare(aState.ordinal());
         Payload.prepareApply();
         Payload.qWrite(aState.ordinal());
         writeCommand(TEventEntry.IC_SET_STATE, Payload.getBuffer());
     }
 
     protected boolean open(String aHost, int aPort) {
         return open(aHost, aPort, true);
     }
 
     protected boolean open(String aHost, int aPort, boolean aStartReadingThread) {
         close();
         try {
             fremoteHost = aHost;
             fremotePort = aPort;
             fsocket = new Socket(fremoteHost, fremotePort);
             if (fsocket.isConnected()) {
                 foutputStream = fsocket.getOutputStream();
                 finputStream = fsocket.getInputStream();
                 // FClient.Connect(FRemoteHost, FRemotePort);
                 // FNetStream = FClient.GetStream();
                 if (aStartReadingThread) {
                     freadingThread = new Thread(new Runnable() {
                         public void run() {
                             readCommands();
                         }
                     });
                     freadingThread.setName("imb command reader");
                     freadingThread.start();
                 }
                 if (imb2Compatible)
                     requestUniqueClientID();
                 // SetState(State.icsClient);
                 setOwner();
                 // request all variables if delegates defined
                 if (onVariable != null || onStatusUpdate != null)
                     writeCommand(TEventEntry.IC_ALL_VARIABLES, null);
             }
             return fsocket.isConnected();
         } catch (Exception ex) {
             return false;
         }
     }
 
     
     // publics
     
     /** returned object (array) on an event name list query */
     public class TEventNameEntry {
         public String eventName;
         public int publishers;
         public int subscribers;
         public int timers;
     }
 
     public enum TVarPrefix {
         vpUniqueClientID,
         vpClientHandle
     }
 
     // constants
     /** The maximum size of the payload in a low level IMB command */
     public static final int MAX_PAYLOAD_SIZE = 10 * 1024 * 1024; // in bytes
     /** value to be used when no specific remote server is used */
     public static final String DEFAULT_HUB = "localhost";
     /** value to be used when no specific port is used */
     public static final int DEFAULT_PORT = 4000;
     /** value to be used when no specific federation is used */
     public static final String DEFAULT_FEDERATION = "TNOdemo";
     // command results
     /** command result: the connection is closed */
     public static final int ICE_CONNECTION_CLOSED = -1;
     /** command result: the event was not published */
     public static final int ICE_EVENT_NOT_PUBLISHED = -2;
 
     // fields
     /**Returns the current federation */
     public String getFederation() {
         return ffederation;
     }
 
     /**Set the current federation. All subscribed and published events are unsubscribed/unpublished, 
      * then the federation is changed and all previously subscribed/publuished events are re-subscribed/re-published
      * @param aFederation the new federation
      */
     public void setFederation(String aFederation) {
         String OldFederation = ffederation;
         TEventEntry Event;
         if (isConnected() && (OldFederation != "")) {
             // un-publish and un-subscribe all
             for (int i = 0; i < feventEntryList.FCount; i++) {
                 String EventName = feventEntryList.getEventName(i);
                 if (!EventName.equals("") && EventName.startsWith(OldFederation + ".")) {
                     Event = feventEntryList.getEventEntry(i);
                     if (Event.isSubscribed())
                         Event.unSubscribe(false);
                     if (Event.isPublished())
                         Event.unPublish(false);
                 }
             }
         }
         ffederation = aFederation;
         if (isConnected() && (OldFederation != "")) {
             // publish and subscribe all
             for (int i = 0; i < feventEntryList.FCount; i++) {
                 String EventName = feventEntryList.getEventName(i);
                 if (!EventName.equals("") && EventName.startsWith(OldFederation + ".")) {
                     Event = feventEntryList.getEventEntry(i);
                     Event.feventName = ffederation + Event.feventName.substring(0, OldFederation.length());
                     if (Event.isSubscribed())
                         Event.subscribe();
                     if (Event.isPublished())
                         Event.publish();
                 }
             }
         }
     }
 
     /**when true events send on not-publuished events are automatically published */
     public boolean autoPublish = true;
     // TODO: check what should be the default, for now backwards compatible?
     /**when true IMB2 features are used if possible to emulate IMB3 behavior */
     public boolean imb2Compatible = true;
 
     // connection
     /**Returns the IP address or DNS name of the currently connected hub */
     public String getRemoteHost() {
         return fremoteHost;
     }
 
     /**Returns the TCP port of the currently connected hub */
     public int getRemotePort() {
         return fremotePort;
     }
 
     /**Returns the state of the NAGLE algorithm on the connected socket
      * @return if true NAGLE is disabled (default false)
      * @throws SocketException
      */
     public boolean getNoDelay() throws SocketException {
         if (isConnected())
             return fsocket.getTcpNoDelay();
         else
             return false;
     }
 
     /**Sets the state of the NAGLE algorithm on the socket
      * @param aValue if true the NAGLE algorithm is DISABLED (default false)
      * @throws SocketException
      */
     public void setNoDelay(boolean aValue) throws SocketException {
         if (isConnected())
             fsocket.setTcpNoDelay(aValue);
     }
 
     /**Returns the status of the linger option on the connected socket
      * @return if true the linger option is enabled 
      * @throws SocketException
      */
     public boolean getLinger() throws SocketException {
         if (isConnected())
             return fsocket.getSoLinger() != -1;
         else
             return false;
     }
 
     /**Sets the status of the linger option on the connected socket
      * @param aValue if true the linger option is enabled with a linger time of 2 seconds
      * @throws SocketException
      */
     public void setLinger(boolean aValue) throws SocketException {
         if (isConnected())
             fsocket.setSoLinger(aValue, 2); // set linger time to 2 seconds
     }
 
     /** Returns the connected state of the connection */
     public boolean isConnected() {
         return (fsocket != null) && fsocket.isConnected();
     }
 
     /** Closes the connection and cleans up socket, streams and thread */
     public void close() {
         if ((fsocket != null) && fsocket.isConnected()) {
             if (onDisconnect != null)
                 onDisconnect.dispatch(this);
             writeCommand(TEventEntry.IC_END_OF_SESSION, null);
             try {
                 foutputStream.close();
                 foutputStream = null;
                 finputStream.close();
                 finputStream = null;
                 fsocket.close();
                 fsocket = null;
                 freadingThread = null;
             } catch (IOException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             }
         }
     }
 
     /** Override dispatch to implement a disconnect handler */
     public interface TOnDisconnect {
         public void dispatch(TConnection aConnection);
     }
 
     /** Handler to be called on a disconnect */
     public TOnDisconnect onDisconnect = null;
 
     /**Throttle down buffer events send to this client if specific flags are set on events  
      * @param aThrottle
      */
     public void setThrottle(int aThrottle) {
         TByteBuffer Payload = new TByteBuffer();
         Payload.prepare(aThrottle);
         Payload.prepareApply();
         Payload.qWrite(aThrottle);
         writeCommand(TEventEntry.IC_SET_THROTTLE, Payload.getBuffer());
     }
 
     /**Manually reading commands when not using a reader thread.
      * Commands are read until connection is idle.
      * @throws IOException
      */
     public void readCommandsNonBlocking() throws IOException {
         if (finputStream.available() != 0) {
             int Command = TEventEntry.IC_INVALID_COMMAND;
             // define once
             // magic + command + payload size
             TByteBuffer FixedCommandPart = new TByteBuffer(MAGIC_BYTES.length + TByteBuffer.SIZE_OF_INT32
                     + TByteBuffer.SIZE_OF_INT32);
             TByteBuffer Payload = new TByteBuffer();
             TByteBuffer PayloadCheck = new TByteBuffer(TByteBuffer.SIZE_OF_INT32);
             do {
                 try {
                     try {
                         Command = readCommand(FixedCommandPart, Payload, PayloadCheck);
                         if (Command != TEventEntry.IC_INVALID_COMMAND)
                             handleCommand(Command, Payload);
                     } catch (ThreadDeath ex) {
                         Command = TEventEntry.IC_END_OF_SESSION;
                     }
                 } catch (Exception ex) {
                     if (isConnected())
                         System.out.println("## Exception in ReadCommands loop: " + ex.getMessage());
                 }
             } while ((Command != TEventEntry.IC_END_OF_SESSION) && isConnected() && (finputStream.available() != 0));
         }
     }
 
     /**Manually reading commands when not using a reader thread.
      * Commands are processed until the reading on the connection times out
      * @param aTimeOut
      * @throws SocketException
      */
     public void readCommandsNonThreaded(int aTimeOut) throws SocketException {
         fsocket.setSoTimeout(aTimeOut);
         int Command = TEventEntry.IC_INVALID_COMMAND;
         // define once
         // magic + command + payload size
         TByteBuffer FixedCommandPart = new TByteBuffer(MAGIC_BYTES.length + TByteBuffer.SIZE_OF_INT32
                 + TByteBuffer.SIZE_OF_INT32);
         TByteBuffer Payload = new TByteBuffer();
         TByteBuffer PayloadCheck = new TByteBuffer(TByteBuffer.SIZE_OF_INT32);
         do {
             try {
                 try {
                     Command = readCommand(FixedCommandPart, Payload, PayloadCheck);
                     if (Command != TEventEntry.IC_INVALID_COMMAND)
                         handleCommand(Command, Payload);
                 } catch (ThreadDeath ex) {
                     Command = TEventEntry.IC_END_OF_SESSION;
                 }
             } catch (Exception ex) {
                 if (isConnected())
                     System.out.println("## Exception in ReadCommands loop: " + ex.getMessage());
             }
         } while ((Command != TEventEntry.IC_END_OF_SESSION) && isConnected());
     }
 
     // owner
     /**Returns the currently specified owner id */
     public int getOwnerID() {
         return fownerID;
     }
 
     /**Changes the owner id
      * @param aValue the new owner id
      */
     public void setOwnerID(int aValue) {
         if (fownerID != aValue) {
             fownerID = aValue;
             setOwner();
         }
     }
 
     /**Returns the currently specified owner name */
     public String getOwnerName() {
         return fownerName;
     }
 
     /**Changes the owner name
      * @param aValue the new owner name
      */
     public void setOwnerName(String aValue) {
         if (fownerName != aValue) {
             fownerName = aValue;
             setOwner();
         }
     }
 
     /**Returns the unique client id the hub assigned to this connection */
     public int getUniqueClientID() {
         return funiqueClientID;
     }
     
     /**Returns the client handle the hub assigned to this connection */
     public int getClientHandle() {
         return fclientHandle;
     }
 
     // subscribe/publish
     /**Subscribe to the specified event
      * @param aEventName the event name to subscribe to (it will be prefixed with the current federation)
      * @return event entry that is to be used to assign the handler for the received events 
      */
     public TEventEntry subscribe(String aEventName) {
         return subscribe(aEventName, true);
     }
 
     /**Subscribe to the specified event
      * @param aEventName the event name to subscribe to
      * @param aUseFederationPrefix if true the given event name will be prefixed with the current federation
      * @return event entry that is to be used to assign the handler for the received events
      */
     public TEventEntry subscribe(String aEventName, boolean aUseFederationPrefix) {
         TEventEntry Event = findOrAddEventL(prefixFederation(aEventName, aUseFederationPrefix));
         if (!Event.isSubscribed())
             Event.subscribe();
         return Event;
     }
 
     /**Publishes on the specified event
      * @param aEventName the event name to publish on (it will be prefixed with the current federation)
      * @return event entry that is to be used to signal events on
      */
     public TEventEntry publish(String aEventName) {
         return publish(aEventName, true);
     }
 
     /**Publishes on the specified event
      * @param aEventName the event name to publish on
      * @param aUseFederationPrefix if true the given event name will be prefixed with the current federation
      * @return event entry that is to be used to signal events on
      */
     public TEventEntry publish(String aEventName, boolean aUseFederationPrefix) {
         TEventEntry Event = findOrAddEventL(prefixFederation(aEventName, aUseFederationPrefix));
         if (!Event.isPublished())
             Event.publish();
         return Event;
     }
 
     /**Unsubscribe from the specified event
      * @param aEventName the event name to unsubscribe from (it will be prefixed with the current federation)
      */
     public void unSubscribe(String aEventName) {
         unSubscribe(aEventName, true);
     }
 
     /**Unsubscribe from the specified event
      * @param aEventName the event name to unsubscribe from
      * @param aUseFederationPrefix if true the given event name will be prefixed with the current federation
      */
     public void unSubscribe(String aEventName, boolean aUseFederationPrefix) {
         TEventEntry Event = findEventL(prefixFederation(aEventName, aUseFederationPrefix));
         if (Event != null && Event.isSubscribed())
             Event.unSubscribe(true);
     }
 
     /**Unpublish on the specified event.
      * @param aEventName the event name to unpublish on (it will be prefixed with the current federation)
      */
     public void unPublish(String aEventName) {
         unPublish(aEventName, true);
     }
 
     /**Unpublish on the specified event.
      * @param aEventName the event name to unpublish on
      * @param aUseFederationPrefix if true the given event name will be prefixed with the current federation
      */
     public void unPublish(String aEventName, boolean aUseFederationPrefix) {
         TEventEntry Event = findEventL(prefixFederation(aEventName, aUseFederationPrefix));
         if (Event != null && Event.isPublished())
             Event.unPublish(true);
     }
 
     /**Send an event to the framework.
      * This is the simple way to send events. More performance can be gained by using the returned event entry from publish().
      * @param aEventName
      * @param aEventKind
      * @param aEventPayload
      * @return result of the command (see ICE_* constants)
      */
     public int signalEvent(String aEventName, int aEventKind, TByteBuffer aEventPayload) {
         return signalEvent(aEventName, aEventKind, aEventPayload, true);
     }
 
     /**Send an event to the framework.
      * This is the simple way to send events. More performance can be gained by using the returned event entry from publish().
      * @param aEventName
      * @param aEventKind
      * @param aEventPayload
      * @param aUseFederationPrefix if true the given event name will be prefixed with the current federation
      * @return result of the command (see ICE_* constants)
      */
     public int signalEvent(String aEventName, int aEventKind, TByteBuffer aEventPayload, boolean aUseFederationPrefix) {
         TEventEntry Event = findEventAutoPublishL(prefixFederation(aEventName, aUseFederationPrefix));
         if (Event != null)
             return Event.signalEvent(aEventKind, aEventPayload.getBuffer());
         else
             return ICE_EVENT_NOT_PUBLISHED;
     }
 
     /**Send a buffer event to the framework.
      * This is the simple way to send events. More performance can be gained by using the returned event entry from publish().
      * @param aEventName
      * @param aBufferID
      * @param aBuffer
      * @return result of the command (see ICE_* constants)
      */
     public int signalBuffer(String aEventName, int aBufferID, byte[] aBuffer) {
         return signalBuffer(aEventName, aBufferID, aBuffer, 0, true);
     }
 
     /**Send a buffer event to the framework.
      * This is the simple way to send events. More performance can be gained by using the returned event entry from publish().
      * @param aEventName
      * @param aBufferID
      * @param aBuffer
      * @param aEventFlags
      * @param aUseFederationPrefix if true the given event name will be prefixed with the current federation
      * @return result of the command (see ICE_* constants)
      */
     public int signalBuffer(String aEventName, int aBufferID, byte[] aBuffer, int aEventFlags,
             boolean aUseFederationPrefix) {
         TEventEntry Event = findEventAutoPublishL(prefixFederation(aEventName, aUseFederationPrefix));
         if (Event != null)
             return Event.signalBuffer(aBufferID, aBuffer, aEventFlags);
         else
             return ICE_EVENT_NOT_PUBLISHED;
     }
 
     /**Send a ChangeObject event to the framework
      * This is the simple way to send events. More performance can be gained by using the returned event entry from publish().
      * @param aEventName
      * @param aAction
      * @param aObjectID
      * @param aAttribute
      * @return result of the command (see ICE_* constants)
      */
     public int signalChangeObject(String aEventName, int aAction, int aObjectID, String aAttribute) {
         return signalChangeObject(aEventName, aAction, aObjectID, aAttribute, true);
     }
 
     /**Send a ChangeObject event to the framework
      * This is the simple way to send events. More performance can be gained by using the returned event entry from publish().
      * @param aEventName
      * @param aAction
      * @param aObjectID
      * @param aAttribute
      * @param aUseFederationPrefix if true the given event name will be prefixed with the current federation
      * @return result of the command (see ICE_* constants)
      */
     public int signalChangeObject(String aEventName, int aAction, int aObjectID, String aAttribute,
             boolean aUseFederationPrefix) {
         TEventEntry Event = findEventAutoPublishL(prefixFederation(aEventName, aUseFederationPrefix));
         if (Event != null)
             return Event.signalChangeObject(aAction, aObjectID, aAttribute);
         else
             return ICE_EVENT_NOT_PUBLISHED;
     }
 
     /**Send a stream to the framework
      * @param aEventName
      * @param aStreamName name of the stream to identify the stream by the receiver
      * @param aStream
      * @return result of the command (see ICE_* constants)
      */
     public int signalStream(String aEventName, String aStreamName, InputStream aStream) {
         return signalStream(aEventName, aStreamName, aStream, true);
     }
 
     /**Send a stream to the framework
      * @param aEventName
      * @param aStreamName
      * @param aStream
      * @param aUseFederationPrefix
      * @return result of the command (see ICE_* constants)
      */
     public int signalStream(String aEventName, String aStreamName, InputStream aStream, boolean aUseFederationPrefix) {
         TEventEntry Event = findEventAutoPublishL(prefixFederation(aEventName, aUseFederationPrefix));
         if (Event != null)
             return Event.signalStream(aStreamName, aStream);
         else
             return ICE_EVENT_NOT_PUBLISHED;
     }
 
     // variables
     /** Override dispatch to implement a variable change handler */
     public interface TOnVariable {
         public void dispatch(TConnection aConnection, String aVarName, byte[] aVarValue, byte[] aPrevValue);
     }
 
     // extra calls when adding a delegate to OnVariable: requestAllVariables();
     /** Handler to be called on a variable change */
     private TOnVariable onVariable = null;
     /**Set the callback handler for framework variable changes
      * @param aValue
      */
     public void setOnVariable(TOnVariable aValue)
     {
         onVariable = aValue;
         requestAllVariables();
     }
 
     /** Send a request to the framework to send all variables with their contents to this client */
     protected void requestAllVariables() {
         writeCommand(TEventEntry.IC_ALL_VARIABLES, null); // request all variables for initial values
     }
 
     /**Set the value of a global framework variable
      * @param aVarName
      * @param aVarValue
      */
     public void setVariableValue(String aVarName, String aVarValue) {
         TByteBuffer Payload = new TByteBuffer();
         Payload.prepare(aVarName);
         Payload.prepare(aVarValue);
         Payload.prepareApply();
         Payload.qWrite(aVarName);
         Payload.qWrite(aVarValue);
         writeCommand(TEventEntry.IC_SET_VARIABLE, Payload.getBuffer());
     }
 
     /**Set the value of a global framework variable
      * @param aVarName
      * @param aVarValue
      */
     public void setVariableValue(String aVarName, TByteBuffer aVarValue) {
         TByteBuffer Payload = new TByteBuffer();
         Payload.prepare(aVarName);
         Payload.prepare(aVarValue);
         Payload.prepareApply();
         Payload.qWrite(aVarName);
         Payload.qWrite(aVarValue);
         writeCommand(TEventEntry.IC_SET_VARIABLE, Payload.getBuffer());
     }
 
     /**Set the value of a global framework variable
      * @param aVarName
      * @param aVarValue
      * @param aVarPrefix
      */
     public void setVariableValue(String aVarName, String aVarValue, TVarPrefix aVarPrefix) {
         TByteBuffer Payload = new TByteBuffer();
         Payload.prepare(aVarPrefix.ordinal());
         Payload.prepare(aVarName);
         Payload.prepare(aVarValue);
         Payload.prepareApply();
         Payload.qWrite(aVarPrefix.ordinal());
         Payload.qWrite(aVarName);
         Payload.qWrite(aVarValue);
         writeCommand(TEventEntry.IC_SET_VARIABLE_PREFIXED, Payload.getBuffer());
     }
 
     /**Set the value of a global framework variable
      * @param aVarName
      * @param aVarValue
      * @param aVarPrefix
      */
     public void setVariableValue(String aVarName, TByteBuffer aVarValue, TVarPrefix aVarPrefix) {
         TByteBuffer Payload = new TByteBuffer();
         Payload.prepare(aVarPrefix.ordinal());
         Payload.prepare(aVarName);
         Payload.prepare(aVarValue);
         Payload.prepareApply();
         Payload.qWrite(aVarPrefix.ordinal());
         Payload.qWrite(aVarName);
         Payload.qWrite(aVarValue);
         writeCommand(TEventEntry.IC_SET_VARIABLE_PREFIXED, Payload.getBuffer());
     }
 
     /** Override dispatch to implement a status change handler */
     public interface TOnStatusUpdate {
         public void dispatch(TConnection aConnection, String aModelUniqueClientID, String aModelName, int aProgress, int aStatus);
     }
 
     // TODO: extra calls when adding a delegate to OnVariable: RequestAllVariables();
     /** Handler to be called on a status update */
     private TOnStatusUpdate onStatusUpdate = null;
     /**Set the callback handler for status updates
      * @param aValue
      */
     public void setOnStatusUpdate(TOnStatusUpdate aValue)
     {
         onStatusUpdate = aValue;
         requestAllVariables();
     }
 
     // status for UpdateStatus
     /** signal client status: ready (see updateStatus) */
     public final static int STATUS_READY = 0; // R
     /** signal client status: calculating (see updateStatus) */
     public final static int STATUS_CALCULATING = 1; // C
     /** signal client status: busy (see updateStatus) */
     public final static int STATUS_BUSY = 2; // B
 
     /**Update the central status for this client
      * @param aProgress the progress, if available, from 0 to 100 or counting down to 0
      * @param aStatus the current status of the client (see STATUS_* constants)
      * @throws InterruptedException
      */
     public void updateStatus(int aProgress, int aStatus) throws InterruptedException {
         TByteBuffer Payload = new TByteBuffer();
         Payload.prepare(aStatus);
         Payload.prepare(aProgress);
         Payload.prepareApply();
         Payload.qWrite(aStatus);
         Payload.qWrite(aProgress);
         if (imb2Compatible) {
             // wait for unique client id
             if (funiqueClientID == 0) {
                 int SpinCount = 10; // 10*500 ms
                 while (funiqueClientID == 0 && SpinCount > 0) {
                     Thread.sleep(500);
                     SpinCount--;
                 }
             }
             // set variable using unique client id
             setVariableValue(Integer.toHexString(funiqueClientID) + prefixFederation(fownerName).toUpperCase() + MODEL_STATUS_VAR_SEP_CHAR
                     + MODEL_Status_VAR_NAME, Payload);
         } else
             setVariableValue(prefixFederation(fownerName).toUpperCase() + MODEL_STATUS_VAR_SEP_CHAR + MODEL_Status_VAR_NAME, Payload,
                     TVarPrefix.vpUniqueClientID);
     }
 
     /** Removes the current status for this client  */
     public void removeStatus() {
         if (imb2Compatible)
 
             setVariableValue(Integer.toHexString(funiqueClientID) + prefixFederation(fownerName) + MODEL_STATUS_VAR_SEP_CHAR
                     + MODEL_Status_VAR_NAME, "");
         else
             setVariableValue(prefixFederation(fownerName) + MODEL_STATUS_VAR_SEP_CHAR + MODEL_Status_VAR_NAME, "",
                     TVarPrefix.vpUniqueClientID);
     }
 
     // TODO: delegates
     /**Subscribe to focus events and registers the callback handler for these events.
      * @param aOnFocus callback event handler
      */
     public void subscribeOnFocus(TEventEntry.TOnFocus aOnFocus) {
         if (ffocusEvent == null)
             ffocusEvent = subscribe(FOCUS_EVENT_NAME);
         ffocusEvent.onFocus = aOnFocus;
     }
 
     /**Signal a new focus point to the framework
      * @param aX
      * @param aY
      * @return result of the command (see ICE_* constants)
      */
     public int signalFocus(double aX, double aY) {
         if (ffocusEvent == null)
             ffocusEvent = findEventAutoPublishL(prefixFederation(FOCUS_EVENT_NAME));
         if (ffocusEvent != null) {
             TByteBuffer Payload = new TByteBuffer();
             Payload.prepare(aX);
             Payload.prepare(aY);
             Payload.prepareApply();
             Payload.qWrite(aX);
             Payload.qWrite(aY);
             return ffocusEvent.signalEvent(TEventEntry.EK_CHANGE_OBJECT_EVENT, Payload.getBuffer());
         } else
             return ICE_EVENT_NOT_PUBLISHED;
     }
 
     // IMB 2 change federation
     /**Subscribe to federation change events and register the callback handler for these events
      * @param aOnChangeFederation
      */
     public void subscribeOnFederationChange(TEventEntry.TOnChangeFederation aOnChangeFederation) {
         if (fchangeFederationEvent == null)
             fchangeFederationEvent = subscribe(CHANGE_FEDERATION_EVENT_NAME);
         fchangeFederationEvent.onChangeFederation = aOnChangeFederation;
     }
 
     /**Signal a new federation to the framework
      * @param aNewFederationID
      * @param aNewFederation
      * @return result of the command (see ICE_* constants)
      */
     public int signalChangeFederation(int aNewFederationID, String aNewFederation) {
         if (fchangeFederationEvent == null)
             fchangeFederationEvent = findEventAutoPublishL(prefixFederation(CHANGE_FEDERATION_EVENT_NAME));
         if (fchangeFederationEvent != null)
             return fchangeFederationEvent.signalChangeObject(TEventEntry.ACTION_CHANGE, aNewFederationID, aNewFederation);
         else
             return ICE_EVENT_NOT_PUBLISHED;
     }
 
     // log
     /**Log an entry to the framework
      * @param aLogEventName
      * @param aLine
      * @param aLevel
      * @return result of the command (see ICE_* constants)
      */
     public int logWriteLn(String aLogEventName, String aLine, TEventEntry.TLogLevel aLevel) {
         if (flogEvent == null)
             flogEvent = findEventAutoPublishL(prefixFederation(aLogEventName));
         if (flogEvent != null)
             return flogEvent.logWriteLn(aLine, aLevel);
         else
             return ICE_EVENT_NOT_PUBLISHED;
     }
 
     // remote event info
 
     // TODO: delegates
     /** Override dispatch to implement an event names request callback handler */
     public interface TOnEventnames {
         public void dispatch(TConnection aConnection, TEventNameEntry[] aEventNames);
     }
 
     /** Handler to be called on a event names request callback */
     public TOnEventnames onEventNames = null;
 
     // TODO: description
     public interface TOnSubAndPub {
         public void dispatch(TConnection aConnection, int aCommand, String aEventName);
     }
 
     // TODO: description
     public TOnSubAndPub onSubAndPub = null;
     
     // event filters
     /** request event name filter: requesting publisher counts */
     public static final int EF_PUBLISHERS = 1;
     /** request event name filter: requesting subscriber counts */
     public static final int EF_SUBSCRIBERS = 2;
     /** request event name filter: requesting timer counts */
     public static final int EF_TIMERS = 4;
 
     /**Query the framework for registered event names
      * @param aEventNameFilter
      * @param aEventFilters
      * @return result of the command (see ICE_* constants)
      */
     public int requestEventname(String aEventNameFilter, int aEventFilters) {
         TByteBuffer Payload = new TByteBuffer();
         Payload.prepare(aEventNameFilter);
         Payload.prepare(aEventFilters);
         Payload.prepareApply();
         Payload.qWrite(aEventNameFilter);
         Payload.qWrite(aEventFilters);
         return writeCommand(TEventEntry.IC_REQUEST_EVENT_NAMES, Payload.getBuffer());
     }
 
     /** {@inheritDoc} */
     @Override
     public final String toString()
     {
         return "TConnection [remoteHost=" + this.fremoteHost + ", remotePort=" + this.fremotePort + ", federation="
                 + this.ffederation + ", isConnected()=" + this.isConnected() + "]";
     }
 }