Type Members

1.  abstract class JavaPartialFunction[A, B] extends AbstractPartialFunction[A, B]

   Helper for implementing a *pure* partial function: it will possibly be invoked multiple times for a single “application”, because its only abstract method is used for both isDefinedAt() and apply(); the former is mapped to isCheck == true and the latter to isCheck == false for those cases where this is important to know.

   Helper for implementing a *pure* partial function: it will possibly be invoked multiple times for a single “application”, because its only abstract method is used for both isDefinedAt() and apply(); the former is mapped to isCheck == true and the latter to isCheck == false for those cases where this is important to know.

   Failure to match is signaled by throwing noMatch(), i.e. not returning normally (the exception used in this case is pre-allocated, hence not that expensive).

   new JavaPartialFunction<Object, String>() {
     public String apply(Object in, boolean isCheck) {
       if (in instanceof TheThing) {
         if (isCheck) return null; // to spare the expensive or side-effecting code
         return doSomethingWithTheThing((TheThing) in);
       } else {
         throw noMatch();
       }
     }
   }

   The typical use of partial functions from Apache Pekko looks like the following:

   if (pf.isDefinedAt(x)) {
     pf.apply(x);
   }

   i.e. it will first call JavaPartialFunction.apply(x, true) and if that does not throw noMatch() it will continue with calling JavaPartialFunction.apply(x, false).

2.  case class Pair[A, B](first: A, second: B) extends Product with Serializable

   Java API Represents a pair (tuple) of two elements.

   Java API Represents a pair (tuple) of two elements.

   Additional tuple types for 3 to 22 values are defined in the org.apache.pekko.japi.tuple package, e.g. pekko.japi.tuple.Tuple3.

   Annotations

   @SerialVersionUID()