SALSA (programming language)

The SALSA programming language (Simple Actor Language System and Architecture) is an actor-oriented programming language that uses concurrency primitives beyond asynchronous message passing, including token-passing, join, and first-class continuations. It also supports distributed computing over the Internet with universal naming, remote communication, and migration linguistic abstractions and associated middleware. For portability, it produces Java code.

Examples

Hello World

module demo;

 
/*
   This behavior simply sends two print(...) messages to the
   standardOutput actor.
*/

behavior HelloWorld {
   /*
      The act(...) message handler is invoked by stand-alone
      theaters automatically and is used to bootstrap salsa
      programs.
   */

   void act( String[] argv ) {

      standardOutput<-print( "Hello" ) @

      standardOutput<-print( "World!" );

   }
   /*
      Notice that the above code is different from
         standardOutput<-print( "Hello" );
         standardOutput<-print( "World!" );
      the code above uses a continuation to insure that the
      world message is sent after the hello message
      completes processing.
   */

}

Standard Input

module demo;

 
/*
   This behavior simply prints out a string,
   reads a line from the Standard Input,
   combines the return value of the Standard Input with other strings,
   and then prints out the combined string.
*/

behavior StandardInputTest{

   public StandardInputTest() {}

   String mergeString(String str1, String str2, String str3) {
       return str1+str2+str3;
    }

   void act(String[] args) {
      standardOutput<-println("What's your name?")@
      standardInput<-readLine()@
      self<-mergeString("Hi, ",token, ". Nice to meet you!" )@
      standardOutput<-println(token);
   }
}

External links

• SALSA programming language website

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