[jboss-as7-dev] json vs custom parser

[David M. Lloyd]

It's in ModelNode (readExternal and writeExternal).

On 02/01/2011 07:14 PM, Scott Stark wrote:
> Where are the binary protocol handlers located?
>
> On 2/1/11 5:10 PM, David M. Lloyd wrote:
>> On 02/01/2011 06:51 PM, Scott Stark wrote:
>>> Just browsing through the as7-dev list I don't see a discussion of why
>>> we have a custom parser for a json like serial format vs just using
>>> json. Was this to avoid a runtime dependency, or was there another reason?
>> The DMR was designed to meet the needs we have, in terms of types (JSON
>> is limited in that it does not support decimal types, longs, or binary
>> blobs, not to mention value types [to allow self-description], and other
>> types which we use like pairs are not well-supported).
>>
>> The use of JSON-like model for DMR was really coincidental.  Now we
>> *could* use JSON but I don't really see the need to compromise a modest
>> amount of usability for a small amount of "standard-ish-ness".  For
>> example one could say the model is also Perl-ish.
>>
>> Though my voice may not be in the majority, it is my believe that most
>> of the management clients in use will either be Java, or command-line
>> scripting languages like python and perl either using our command-line
>> interface via shell, or via interface to JBoss Remoting (I have planned
>> a Perl 5 client for JBoss Remoting, in my copious amounts of free time).
>>
>> The thing to note is that the JSON-like serialization format is NOT the
>> primary interface for serializing DMR; the binary protocol is more
>> efficient, simpler and faster to parse, and cross-platform compatible
>> (more so than the equivalent JSON - even to JavaScript - because using a
>> simple binary parser [and I do mean _simple_] you can support the full
>> range of DMR types, not just JS primitive types).  DMR nodes implement
>> Externalizable but can also be written to any OutputStream.
>>
>> IMO, the only reason we have a JSON parser/deparser at all is that
>> _some_people_ (whom I will not name) think it's better because it's
>> "standard-y" and seems easier to interface.  I have a suspicion that the
>> binary protocol will supercede JSON in all use cases, including JS
>> clients, due to performance and correctness reasons.  Though the burden
>> is likely to fall on me to prove that. :)
>
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