Package ptolemy.domains.giotto.kernel

Class GiottoReceiver

  • All Implemented Interfaces:
    Receiver, StateReceiver
    public class GiottoReceiver
extends AbstractReceiver
implements StateReceiver
    A receiver for the Giotto domain. It uses double-buffering. An actor may write to a receiver using put at any time. However, a new token will only be available to get if update has been called before. The update method makes the token from the last put invocation available to get. The GiottoDirector delays calls to update according to the Giotto semantics.
    Since:
    Ptolemy II 1.0
    Version:
    $Id$
    Author:
    Christoph Meyer Kirsch and Edward A. Lee
    See Also:
    GiottoDirector
    Pt.AcceptedRating:
    Yellow (liuj)
    Pt.ProposedRating:
    Yellow (cm)

    • Constructor Summary

      Constructors 
      Constructor Description
      GiottoReceiver()
      Construct an empty GiottoReceiver with no container.
      GiottoReceiver​(IOPort container)
      Construct an empty GiottoReceiver with the specified container.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void clear()
      Clear this receiver of any contained tokens.
      java.util.List<Token> elementList()
      Return a list with the token currently in the receiver, or an empty list if there is no such token.
      Token get()
      Get the contained and available token, i.e., get the last token that has been put into the receiver before the last update.
      boolean hasRoom()
      Return true, since writing to this receiver is always allowed.
      boolean hasRoom​(int numberOfTokens)
      Return true, since writing to this receiver is always allowed.
      boolean hasToken()
      Return true if there is a token available.
      boolean hasToken​(int numberOfTokens)
      Return true if the receiver has at least one token available.
      void put​(Token token)
      Put a token into this receiver.
      Token remove()
      Get the contained and available token, i.e., get the last token that has been put into the receiver before the last update and reset the _token only.
      void reset()
      Reset the receiver by removing all tokens from the receiver.
      void update()
      Update the receiver by making the last token that has been passed to put() available to get().

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

    • Constructor Detail

      • GiottoReceiver

        public GiottoReceiver()
        Construct an empty GiottoReceiver with no container.

      • GiottoReceiver

        public GiottoReceiver​(IOPort container)
               throws IllegalActionException
        Construct an empty GiottoReceiver with the specified container.
        Parameters:
        container - The container.
        Throws:
        IllegalActionException - If the container does not accept this receiver.

    • Method Detail

      • clear

        public void clear()
        Clear this receiver of any contained tokens. FIXME. Should rename and replace all the reset() with clear().
        Specified by:
        clear in interface Receiver
        Overrides:
        clear in class AbstractReceiver

      • elementList

        public java.util.List<Token> elementList()
        Return a list with the token currently in the receiver, or an empty list if there is no such token.
        Specified by:
        elementList in interface Receiver
        Overrides:
        elementList in class AbstractReceiver
        Returns:
        A list of instances of Token.

      • hasRoom

        public boolean hasRoom()
        Return true, since writing to this receiver is always allowed.
        Specified by:
        hasRoom in interface Receiver
        Specified by:
        hasRoom in class AbstractReceiver
        Returns:
        True.

      • hasRoom

        public final boolean hasRoom​(int numberOfTokens)
        Return true, since writing to this receiver is always allowed.
        Specified by:
        hasRoom in interface Receiver
        Specified by:
        hasRoom in class AbstractReceiver
        Parameters:
        numberOfTokens - The size of tokens to be written to the receiver.
        Returns:
        True.

      • hasToken

        public boolean hasToken()
        Return true if there is a token available. A token is available whenever put() has been called at least once followed by a call to the update() method.
        Specified by:
        hasToken in interface Receiver
        Specified by:
        hasToken in class AbstractReceiver
        Returns:
        True if there is a token available.

      • hasToken

        public final boolean hasToken​(int numberOfTokens)
        Return true if the receiver has at least one token available. Any number of calls to get() is allowed and will return the same available token.
        Specified by:
        hasToken in interface Receiver
        Specified by:
        hasToken in class AbstractReceiver
        Parameters:
        numberOfTokens - The number of tokens available in this receiver.
        Returns:
        True if there is a token available.

      • put

        public void put​(Token token)
         throws NoRoomException
        Put a token into this receiver. Any token which has been put into the receiver before without calling update will be lost. The token becomes available to the get() method only after update() is called.

        Note that putting a null into this receiver will leave the receiver empty after update. The receiver does not check against this but expects that IOPort will always put non-null tokens into receivers.

        Specified by:
        put in interface Receiver
        Specified by:
        put in class AbstractReceiver
        Parameters:
        token - The token to be put into this receiver.
        Throws:
        NoRoomException - Not thrown in this base class.

      • remove

        public Token remove()
             throws NoTokenException
        Get the contained and available token, i.e., get the last token that has been put into the receiver before the last update and reset the _token only.
        Returns:
        A token.
        Throws:
        NoTokenException - If no token is available.

      • reset

        public void reset()
        Reset the receiver by removing all tokens from the receiver.
        Specified by:
        reset in interface Receiver
        Overrides:
        reset in class AbstractReceiver

      • update

        public void update()
        Update the receiver by making the last token that has been passed to put() available to get().