dc.js - Dimensional Charting with Non-Exclusive Attributes -


the following schematic, simplified, table, showing http transactions. i'd build dc analysis using dc, of columns don't map crossfilter.

schematic http transactions

in settings of question, http transactions have fields time, host, requestheaders, responseheaders, , numbytes. however, different transactions have different specific http request , response headers. in table above, 0 , 1 represent absence , presence, respectively, of specific header in specific transaction. sub-columns of requestheaders , responseheaders represent unions of headers present in transactions. different http transaction datasets surely generate different sub-columns.

for question, row in chart represented in code this:

{     "time": 0,     "host": "a.com",     "requestheaders": {"foo": 0, "bar": 1, "baz": 1},     "responseheaders": {"shmip": 0, "shmap": 1, "shmoop": 0},     "numbytes": 12 }

the time, host, , numbytes translate crossfilter, , it's possible build charts answering things total number of bytes seen transactions between 2 , 4 host a.com. e.g., 

var ndx = crossfilter(data); ... var hostdim = ndx.dimension(function(d) {     return d.host; }); var hostbytes = hostdim.group().reducesum(function(d) {     return d.numbytes; });

the problem that, slices of time , host, i'd show (capped) bar charts of (leading) request , response headers bytes. e.g. (see first row), time 0 , host a.com, request headers bar chart should show bar , baz each have 12.

there 2 problems, minor 1 , major one.

minor problem

this doesn't fit quite naturally dc, it's one-directional. these bar charts should updated other slices, can't used slicing themselves. e.g., shouldn't able select bar , deselect baz, , resulting breakdown of hosts bytes, because mean: hosts in transactions have bar don't have baz? hosts in the transactions have bar , either or don't have baz? it's unintuitive.

how can make dc charts 1 directional. through hack of disabling mouse inputs?

major problem

as opposed host, foo , bar non-exclusive. each transaction's host either or other, transaction's headers might include combination of foo , bar.

how can define crossfilter dimensions requestheaders, then, , how can use dc? is

var ndx = crossfilter(data); ... var requestheadersdim = ndx.dimension(function(d) {     // should go here?  });

the way deal major problem state transform data there separate record each header (all other fields in these duplicate records same). use custom group aggregations avoid double-counting. these custom aggregations bit hard manage built reductio using 'exception' function - github.com/esjewett/reductio


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