Jolie defines two types of operations:

  • one-way operations, which receive a message;
  • request-response operations, which reply or receive a message and send back a response.

Thus an interface is a collection of operation types, a list of One-Way and Request-Response operation declarations.

The basic declaration of an interface lists all the names of the its operations, grouped by type:

interface identifier {
        ow_name1( t1 ), 
        ow_name2( t2 ), 
        ow_nameN( tN )
        rr_name1( tk1 )( tk2 ),
        rr_name2( tk3 )( tk4 ),
        rr_nameN( tkN )( tkN+1 )

The syntax presented above includes the types of the messages of each operation. One-way operations require only one message type, whilst request-responses define both request (left argument) and response (right argument) types.

Let us declare the interface SumInterface:

interface SumInterface {
        sum( SumRequest )( int )

SumInterface defines a request-response operation sum. SumInterface is the same used in the declaration of SumInput and SumServ, shown at the end of ports subsection.

The type declarations of both request and response messages are explained further in the data types subsection below.

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