>
> It's "ref > field-ref > variable-ref", "default-ref" is used when no
> ref is present and that field-ref nor variable-ref points to something
> useful.
> "else-ref" contains a sequence of participant that are used in case of
> failure of communication with ref/field-ref/variable-ref. As soon as a
> participant in else-ref gets the workitem (dispatch successful), the
> participant expression is considered as 'applied'.
>
It means that the choice is exclusive? Like this:
if (isValidParticipant(ref )) participant-ref = ref;
else if (isValidParticipant(field-ref)) participant-ref = field-ref;
else if (isValidParticipant(variable-ref)) participant-ref = variable-ref;
else if (isValidParticipant(default-ref)) participant-ref = default-ref;
else {
while (else-ref.hasNext() && !responseFrom(participant-ref)) {
participant-ref = else-ref.next()
if (isValidParticipant(participant-ref)) {
timeout.init()
while (! timeout.isOver()) {
sleep(XX);
}
}
}
}
if (! isValid(participant-ref)) {
// what happens if all fails?
}
If we use the $ notation we could express the field-ref and variable-ref by
the ref attribute like this?
<participant
ref = ${variable-name} <=> variable-ref = variable-name
ref = ${f:field-name} <=> field-ref = field-name
>
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