To the discussion in the [[http://trac.prcn.bitcoin-analytics.com/ceasy/ticket/515]] 

We discussed list of modules affected.

Collector side:
* collector/bin/collector.js method {{{nextTick}}}
{{{ 
process.nextTick(function ()
{ 
...
var     exchangeApi = require('../../server/lib/depthAPI')

exchangeApi.init(config.tickersToFetch, config.streamAPIModes, config.enabledCurrencies)
...
}
}}}
* server/lib/config.js constants {{{enabledCurrencies}}}, {{{streamAPIModes}}} the latter intended to be used in {{{exchangeAPIObj.init}}} method to select specific version of internal adapter implementation (REST or Websocket real time synchronized)
{{{
exports.enabledCurrencies = ['USD', 'EUR', 'CNY',

exports.streamAPIModes = {..., coinbaseUSD: 'coinbase1'}
}}}
* server/lib/depthAPI.js
each exchange represented by instance of exchangeAPIObj, collector requests each order book using method {{{getCurrentBook2}}}
while published {{{events}}} is global event emitter instance to pass trades events.
{{{
...

exports.events = new (require('events').EventEmitter)() //trade events, orderbook events

var exchangeAPIObjs = {}

...

exports.getCurrentBook2 = function(ticker)
{
        return exchangeAPIObjs[ticker].currentHashBook
}
...
}}}

method {{{init}}} takes list of exchanges specific for current server to instantiate and initialize exchange objects which is returned as hash(key=ticker,value=exObj) and stored in {{{exchangeAPIObjs}}} in the module scope.
{{{
exports.init = function (tickersToFetch, streamApiModes, currencies)
{
        exchangeAPIObjs = arr.mapToHash(tickersToFetch, function(ticker)
        {
                var exObj = apiParams[ticker].exAPIObj ? new apiParams[ticker].exAPIObj() : new api.exAPIDefault()

                exObj.init(ticker, apiParams, exports.events, streamApiModes)
                return exObj
        })
...
}
}}}

{{{apiParams}}} is initialize from execution of the method {{{makeApiParams}}}
{{{
...

var apiParams = makeApiParams()
exports.apiParams = apiParams
}}}

where definition of the method {{{makeApiParams}}} is as following
{{{
function makeApiParams()
{
        return {
...
,       mtgoxUSD: makeMtgox('USD')
,       btceUSD: {
                url: 'https://btc-e.com/api/3/depth/btc_usd?limit=2000',
                cur : 'USD',
                parse :  fixPriceKeysEx(
                        function (x){ return x['btc_usd']},
                        'bids', 'asks',
                        fn.id),
                exAPIObj: api.btcePollingTrades,
                trades_url: 'https://btc-e.com/api/3/trades/btc_usd?limit=2000',
                trades_key: 'btc_usd',
                polling_freq: 3600 / 30,
                pollingAliveTimeout: 5 * 60 * 1000,
    DoRejectUnauthorized : true
        }
...

}}}

where {{{coinbaseUSD}}} is defined as 
{{{
...

, coinbaseUSD: {
        cur: 'USD',
        exAPIObj: require('./exchange-api/coinbaseAPIClass').exAPICoinbase
}
...
}}}

where {{{api.exAPICoinbase}}} is included from 
{{{
...
, api = require('./exchange-api/apiClasses')
...
}}}