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Diffstat (limited to 'doc/reference/ScalaByExample.tex')
| -rw-r--r-- | doc/reference/ScalaByExample.tex | 36 |
1 files changed, 20 insertions, 16 deletions
diff --git a/doc/reference/ScalaByExample.tex b/doc/reference/ScalaByExample.tex index c7659ff25c..a5eaf71c41 100644 --- a/doc/reference/ScalaByExample.tex +++ b/doc/reference/ScalaByExample.tex @@ -271,6 +271,24 @@ its incoming messages which is represented as a queue. It can work sequentially through the messages in its mailbox, or search for messages matching some pattern. +\begin{lstlisting}[style=floating,label=fig:simple-auction-msgs,caption=Implementation of an Auction Service] +trait AuctionMessage; + +/** make a bid */ +case class Offer(bid: int, client: Actor) extends AuctionMessage; + +/** inquire status */ +case class Inquire(client: Actor) extends AuctionMessage; + +trait AuctionReply; +case class Status(asked: int, expiration: Date) extends AuctionReply; +case object BestOffer extends AuctionReply; +case class BeatenOffer(maxBid: int) extends AuctionReply; +case class AuctionConcluded(seller: Actor, client: Actor) extends AuctionReply; +case object AuctionFailed extends AuctionReply; +case object AuctionOver extends AuctionReply; +\end{lstlisting} + For every traded item there is an auctioneer process that publishes information about the traded item, that accepts offers from clients and that communicates with the seller and winning bidder to close the @@ -281,22 +299,8 @@ As a first step, we define the messages that are exchanged during an auction. There are two abstract base classes (called {\em traits}): \code{AuctionMessage} for messages from clients to the auction service, and \code{AuctionReply} for replies from the service to the -clients. These are defined as follows. -\begin{lstlisting} -trait AuctionMessage; -case class - Offer(bid: int, client: Actor), // make a bid - Inquire(client: Actor) extends AuctionMessage; // inquire status - -trait AuctionReply; -case class - Status(asked: int, expiration: Date), // asked sum, expiration date - BestOffer, // yours is the best offer - BeatenOffer(maxBid: int), // offer beaten by maxBid - AuctionConcluded(seller: Actor, client: Actor), // auction concluded - AuctionFailed, // failed with no bids - AuctionOver extends AuctionReply; // bidding is closed -\end{lstlisting} +clients. For both base classes there exists a number of cases, which +are defined in Figure~\ref{fig:simple-auction-msgs}. \begin{lstlisting}[style=floating,label=fig:simple-auction,caption=Implementation of an Auction Service] class Auction(seller: Actor, minBid: int, closing: Date) extends Actor { |