The DROP signal signals the dropping of a service execution or call.

An example of signaling during the execution of a service request.

S1 EMIT    START
S1 EMIT    DROP
S1 EMIT    STOP

An example of signaling during the execution of a service request that involves another service.

S1 EMIT    START
S2 EMIT    CALL
S2 RECEIPT DROP
S1 EMIT    DELAY
S2 EMIT    RETRY
S2 EMIT    CALL
S2 RECEIPT SUCCEED
S1 EMIT    SUCCEED
S1 EMIT    STOP

An example of signaling from the perspective of both ends in a service-to-service interaction.

S1 CONTEXT          |  S2 CONTEXT
------------------------------------------
S1 EMIT    START    |    
S2 EMIT    CALL     |    
                    |  S2 EMIT    START
                    |  S2 EMIT    DROP
                    |  S2 EMIT    STOP
S2 RECEIPT DROP     |
S1 EMIT    FAIL     |
S1 EMIT    STOP     |

An example of signaling from the perspective of both ends in a service-to-service interaction in which the service name was transferred with the request payload.

S1 CONTEXT          |  S2 CONTEXT
------------------------------------------
S1 EMIT    START    |    
S2 EMIT    CALL     |    
                    |  S2 EMIT    START
                    |  S1 RECEIPT CALL
                    |  S1 EMIT    DROP
                    |  S2 EMIT    DROP
                    |  S2 EMIT    STOP
S2 RECEIPT DROP     |
S1 EMIT    FAIL     |
S1 EMIT    STOP     |