Answer Posted / aarthi srinivasachari

My input:
1) One disadvantage : If there is an exception in the
transformer service, all the pipeline values of the running
flow service will be lost and cannot be caught in
the 'lastError' service. This makes debugging quite tough.

To sum up :
2) Transformers and service invoke does Value
transformations. But with Transformers, in a single step,
multiple transformations can be done.
3) Memory efficient: when compared to using multiple invoke
steps - a single step with multiple transformers consumes
lesser memory.
4) The order of execution of transformers cannot be
controlled. This is more based on the order of transformers
listed in flow.XML (As we know array in XML may be read
from bottom to top)
5) While using transformers, we dont have to worry about
dropping the in/out variables.

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