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@ -25,8 +25,9 @@ Here's a way to model this in PSYC:
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** A message with JSON-unfriendly characters
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** A message with JSON-unfriendly characters
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This message contains some characters which are
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This message contains some characters which are
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impractical to encode in JSON. Let's see how much
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impractical to encode in JSON. We should probably
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performance impact this has.
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put a lot more inside to actually see an impact
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on performance.
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#+INCLUDE: packets/json-unfriendly.xml src xml
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#+INCLUDE: packets/json-unfriendly.xml src xml
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#+INCLUDE: packets/json-unfriendly.json src js
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#+INCLUDE: packets/json-unfriendly.json src js
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@ -34,7 +35,8 @@ performance impact this has.
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** A message with XML-unfriendly characters
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** A message with XML-unfriendly characters
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Same test with characters which aren't practical
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Same test with characters which aren't practical
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in the XML syntax.
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in the XML syntax, yet we should put more of
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them inside.
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#+INCLUDE: packets/xml-unfriendly.xml src xml
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#+INCLUDE: packets/xml-unfriendly.xml src xml
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#+INCLUDE: packets/xml-unfriendly.json src js
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#+INCLUDE: packets/xml-unfriendly.json src js
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@ -170,6 +172,49 @@ not performed.
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These tests were performed on a 2.53 GHz Intel(R) Core(TM)2 Duo P9500 CPU.
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These tests were performed on a 2.53 GHz Intel(R) Core(TM)2 Duo P9500 CPU.
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* Criticism
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Are we comparing apples and oranges? Yes and no, depends on what you
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need. XML is a syntax best suited for complex structured data in
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well-defined formats - especially good for text mark-up. JSON is a syntax
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intended to hold arbitrarily structured data suitable for immediate
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inclusion in javascript source codes. The PSYC syntax is an evolved
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derivate of RFC 822, the syntax used by HTTP and E-Mail, and is therefore
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limited in the kind and depth of data structures that can be represented
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with it, but in exchange it is highly performant at doing just that.
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In fact we are looking into suitable syntax extensions to represent
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generic structures and semantic signatures, but for now PSYC only
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provides for simple typed values and lists of typed values.
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Another aspect is the availability of these formats for spontaneous
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use. You could generate and parse JSON yourself but you have to be
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careful about escaping. XML can be rendered manually if you know your
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data will not break the syntax, but you can't really parse it without
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a bullet proof parser. PSYC is easy to render and parse yourself for
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simple tasks, as long as your body does not contain "\n|\n" and your
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variables do not contain newlines.
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After all it is up to you to find out which format fulfils your
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requirements the best. We use PSYC for the majority of messaging where
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JSON and XMPP aren't efficient and opaque enough, but we employ XML and
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JSON as payloads within PSYC for data that doesn't fit the PSYC model.
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For some reason all three formats are being used for messaging, although
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only PSYC was actually designed for that purpose.
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* Caveats
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In every case we'll compare performance of parsing and re-rendering
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these messages, but consider also that the applicative processing
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of an XML DOM tree is more complicated than just accessing
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certain elements in a JSON data structure or PSYC variable
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mapping.
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For a speed check in real world conditions which also consider the
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complexity of processing incoming messages we should compare
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the performance of a chat client using the two protocols,
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for instance by using libpurple with XMPP and PSYC accounts.
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To this purpose we first need to integrate libpsyc into libpurple.
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* Conclusions
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* Conclusions
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The Internet has developed two major breeds of protocol formats.
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The Internet has developed two major breeds of protocol formats.
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@ -187,46 +232,6 @@ combines the compactness and efficiency of binary protocols with the
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extensibility of text-based protocols and still provides for enough
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extensibility of text-based protocols and still provides for enough
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data structuring to rarely require the use of other data formats.
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data structuring to rarely require the use of other data formats.
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* Criticism
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Are we comparing apples and oranges? Yes and no, depends on what you
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need. XML is a syntax best suited for complex structured data in
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well-defined formats - especially good for text mark-up. JSON is a syntax
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intended to hold arbitrarily structured data suitable for immediate
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inclusion in javascript source codes. The PSYC syntax is an evolved
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derivate of RFC 822, the syntax used by HTTP and E-Mail, and is therefore
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limited in the kind and depth of data structures that can be represented
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with it, but in exchange it is highly performant at doing just that.
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So it is up to you to find out which format fulfils your
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requirements the best. We use PSYC for the majority of messaging where
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JSON and XMPP aren't efficient and opaque enough, but we employ XML and
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JSON as payloads within PSYC for data that doesn't fit the PSYC model.
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For some reason all three formats are being used for messaging, although
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only PSYC was actually designed for that purpose.
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Another aspect is the availability of these formats for spontaneous
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use. You could generate and parse JSON yourself but you have to be
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careful about escaping. XML can be rendered manually if you know your
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data will not break the syntax, but you can't really parse it without
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a bullet proof parser. PSYC is easy to render and parse yourself for
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simple tasks, as long as your body does not contain "\n|\n" and your
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variables do not contain newlines.
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* Caveats
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In every case we'll compare performance of parsing and re-rendering
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these messages, but consider also that the applicative processing
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of an XML DOM tree is more complicated than just accessing
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certain elements in a JSON data structure or PSYC variable
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mapping.
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For a speed check in real world conditions which also consider the
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complexity of processing incoming messages we should compare
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the performance of a chat client using the two protocols,
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for instance by using libpurple with XMPP and PSYC accounts.
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To this purpose we first need to integrate libpsyc into libpurple.
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* Futures
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* Futures
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After a month of development libpsyc is already performing pretty
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After a month of development libpsyc is already performing pretty
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