rescue how to raise further or forget an exception

Question

How do I raise an exception further in eiffel? I have 3 cases

I want to retry

a_feature
    local
        l_retries_count: INTEGER
    do
        some_potential_failing_feature
    rescue
        if l_retries_count <= 3 then
            l_retries_count := l_retries_count + 1
            retry
        end
    end

I want to do close db connection and ignore exception

a_feature
    do
        some_potential_failing_feature
    rescue
        db_connection.close
    end

I want to do close db connection and send an email to an admin and ignore

a_feature
    do
        some_potential_failing_feature
    rescue
        db_connection.close
        send_email_to_admin
    end

I want to close db_connection and raise the exception further, I'll put all the cases I can think about into the above code

a_feature
    local
        l_retries_count: INTEGER
    do
        some_potential_failing_feature
    rescue
        if l_retries_count <= 3 then
            l_retries_count := l_retries_count + 1
            log_error ("Error, retrying for " + l_retries_count.out + "th time")
            retry
        else
            db_connection.close
            send_email_to_admin
            -- raise the_created_exception_from_some_potential_failing_feature -- how do I do that?
        end
    end

score 2 · Accepted Answer · answered Jan 21 '21 at 11:42

You can try one of the following:

{EXCEPTION_MANAGER}.last_exception.original.raise
{EXCEPTION_MANAGER}.last_exception.cause.raise
{EXCEPTION_MANAGER}.last_exception.raise

The first one goes through the chain of exceptions ignoring those triggered as a result of failed routines. It might be the one you are looking for.

The next two retrieve either the cause of the current exception or the current exception itself, though it might be not the one you are looking for because it depends on the context of the exception and the nested calls.

rescue how to raise further or forget an exception

1 Answers1