Changes in 4.2.1


Table callbacks

The ability to specify callbacks per table has been added at the messaging level. The example below shows the APIs to manage callbacks.

 callback:{[t;x] 0N!(t;x) };
 trade:([] time:.z.p; sym:`A`B; price:100 200.; size:1000 1000)

 // add a callback
 .dm.addCallback[`trade; `callback];

 // execute callbacks
 .dm.applyCallbacks[`trade; trade];
 /=> (`trade;+`time`sym`price`size!(2018.08.06D05:42:44.188299000 2018.08.06D05:42:44.188299000;`A`B;100 200f;1000 1000))

 // remove callback
 .dm.removeCallback[`trade; `callback];

Multiple callbacks can be added for each table.


The reconnection logic is now configurable via enhanced instance parameters. See the Messaging section for more information.

HDB Template

A new process parameter, reloadFunct, has been added to the DS_HDB template. This is an analytic that will be called whenever the HDB is reloaded.

It should be an analytic with no parameters.


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