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David,
Thank you very much for your reply. You are right about point 4 it should have
been T4.
for the point2: What I am trying to explain is typeRef for all the message
templates are "t4". Now if I define a new message template "T5" with typeRef
"t4" as follows:
(template name=”T5”)
(typeRef name=”t4”)
(string name=”Field1” presence=”mandatory”)
(copy dictionary=”global”)
(/string)
(string name=”Field2” presence=”mandatory”)
(copy dictionary=”global”)
(/string)
(string name=”Field3” presence=”mandatory”)
(copy dictionary=”type”)
(/string)
(string name=”Field4” presence=”mandatory”)
(copy dictionary=”type”)
(/string)
(string name=”Field5” presence=”mandatory”)
(copy dictionary=”type”)
(/string)
(string name=”Field6” presence=”mandatory”)
(copy dictionary=”type”)
(/string)
(string name=”Field7” presence=”mandatory”)
(copy dictionary=”type”)
(/string)
(/template)
The Questions are
1. All the fields are copy operators so will it copy the previous instance of
Following fields
field3 from message template "T1"
field4 from message template "T2"
field5 from message template "T3"
filed6 from message template "T4"
while encoding the messages in the same sequence as T1,T2,T3,T4,T5.
Regards,
Rup
> 1. See section 6.3.1 of the FAST Specification 1.1. It states that the
> default dictionary is the global dictionary. You're correct that you
> don't need to specify it explicitly.
>
> 2. I'm not sure I understand your question here and what the FAST
> processor is supposed to handle automatically. If you refer to
> typeRef, then that is something you'll have to add manually in the
> template definition. It affects the behavior of operators using the
> dictionary 'type'. However, it doesn't have a direct correspondence
> on the wire.
>
> Other than affecting the behavior of operators, the primary purpose of
> the typeRef element is to indicate to the application what application
> type the template is a template for. If you have multiple templates for
> the same application type, then they should all share the same typeRef.
>
> 3. The basic semantics of the copy and increment operators are the same
> in FAST 1.0 and FAST 1.1. However, in FAST 1.1 you can use
> dictionaries and explicit keys that make the operators behave in a
> way that wasn't possible in FAST 1.0.
>
> 4. Your mappings of dictionaries per field seems correct (assuming the
> second T3 template should have been T4)
>
> 4. They're fundamentally different. I've already described typeRef
> above. A templateRef is a reference to another template. If the
> templateRef has a name, a static reference, then you can think of it
> as the instructions of the referred template are inserted at the
> point of reference. If the templateRef don't have a name, a dynamic
> reference, then a PMAP and template identifier are expected at the
> corresponding point in an encoded message. The template identifier
> then tells the decoder what lies and in effect starts a submessage on
> the wire. See section 6.4 in the specification for details.
>
> /David
>
> > I am new to FAST and want to define the template inheritance. I have
> > following questions
> > 1. Do we need to define the "global" dictionary template ? my
> > understanding: I dont think so !
> >
> > 2. do we need to define the reference template by itself or the FAST
> > code should build by itself. my understanding: Fast code should by
> > itself
> >
> > 3. If I want to use only copy code and increment code operators. Is
> > there any difference between FAST 1.0 and 1.1 ? my understanding:
> > for these two operator there is no change in the updated spec
> >
> > 4. Can someone clarify my understanding of following template
> > definition ?
> >
> >
> > (template name=”T1” ) (typeRef name=”t4”) (string name=”Field1”
> > presence=”mandatory”) (copy dictionary=”global”) (/string) (string
> > name=”Field2” presence=”mandatory”) (copy dictionary=”global”)
> > (/string) (string name=”Field3” presence=”mandatory”) (copy
> > dictionary=”type”) (/string) (string name=”Field4”
> > presence=”mandatory”) (copy dictionary=”template”) (/string)
> > (/template)
> >
> > (template name=”T2” ) (typeRef name=”t4”) (string name=”Field2”
> > presence=”mandatory”) (copy dictionary=”global”) (/string) (string
> > name=”Field3” presence=”mandatory”) (copy dictionary=”global”)
> > (/string) (string name=”Field4” presence=”mandatory”) (copy
> > dictionary=”type”) (/string) (string name=”Field5”
> > presence=”mandatory”) (copy dictionary=”template”) (/string)
> > (/template)
> >
> > (template name=”T3”) (typeRef name=”t4”) (string name=”Field3”
> > presence=”mandatory”) (copy dictionary=”global”) (/string) (string
> > name=”Field4” presence=”mandatory”) (copy dictionary=”global”)
> > (/string) (string name=”Field5” presence=”mandatory”) (copy
> > dictionary=”type”) (/string) (string name=”Field6”
> > presence=”mandatory”) (copy dictionary=”template”) (/string)
> > (/template)
> >
> > (template name=”T3”) (typeRef name=”t4”) (string name=”Field4”
> > presence=”mandatory”) (copy dictionary=”global”) (/string) (string
> > name=”Field5” presence=”mandatory”) (copy dictionary=”global”)
> > (/string) (string name=”Field6” presence=”mandatory”) (copy
> > dictionary=”type”) (/string) (string name=”Field7”
> > presence=”mandatory”) (copy dictionary=”template”) (/string)
> > (/template)
> >
> > Following is my understanding is: Template1:
> > T1.field1 global
> > T2.field2 global
> > T3.field3 t4
> > T4.field4 T1
> >
> > Template2:
> > T5.field2 global
> > T6.field3 global
> > T7.field4 t4
> > T8.field5 T2
> >
> > Template3:
> > T9.field3 global
> > T10.field4 global
> > T11.field5 t4
> > T12.field6 T3
> >
> > Template4:
> > T13.field4 global
> > T14.field5 global
> > T15.field6 t4
> > T16.field7 T4
> >
> >
> > 5. In the above example if I use templateRef instead of typeRef what
> > is the difference ? my understanding : nothing !
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