azure - Getting the time frame in which a series of message is received in stream analytics -


i streaming event messages contain posix/epoch time field. trying calculate in time frame received series of messages device.

let's assume following (simplified) input:

[    { "deviceid":"device01", "epochtime":1500975613660 },    { "deviceid":"device01", "epochtime":1500975640194 },    { "deviceid":"device01", "epochtime":1500975649627 },    { "deviceid":"device01", "epochtime":1500994473225 },    { "deviceid":"device01", "epochtime":1500994486725 } ]

the result of calculation should message {deviceid, start, end} each device id. assume new time frame starts, if time intervall between 2 events longer 1 hour. in example result in 2 transmissions:

[ {"deviceid":"device01", "start":1500975613660, "end"=1500975649627}, {"deviceid":"device01", "start":500994473225, "end"=1500994486725} ]

i can convert epoch time according example 2 in documentation https://msdn.microsoft.com/en-us/library/azure/mt573293.aspx. however, cannot use converted timestamp lag function in sub query. values previoustime null in ouput.

with step1 ( select    [deviceid] deviceid,    system.timestamp ts,    lag([ts]) on (limit duration(hour, 24)) previoustime     input timestamp dateadd(millisecond, epochtime, '1970-01-01t00:00:00z')  )

i not sure how can perform calculation , what's best way it. need figure out beginning , end of event series.

any appreciated.

i modified query below in order expected result:

with step1 (   select        [deviceid] deviceid,     system.timestamp ts,     lag(dateadd(millisecond, epochtime, '1970-01-01t00:00:00z') ) on (limit duration(hour, 24)) previoustime         input timestamp dateadd(millisecond, epochtime, '1970-01-01t00:00:00z')  ) select * step1

the problem "ts" defined in current step, when using lag looking @ original message coming from statement, , doesn't contain "ts" variable.

let me know if have question.

thanks,

js - azure stream analytics team


Comments

Post a Comment

Popular posts from this blog

node.js - Node js - Trying to send POST request, but it is not loading javascript content -

i have been trying send post request website, , has not been loading full site. i guessing problem node js not loading javascript content, executing it. can see javascript in response, though never loads content javascript files producing in html. what mean is, doesn't execute javascript. how make node js code overcome this, , wait the full website load? have tried native code, , "request' module, both producing same errors. if helps, don't need native javascript. modules fine. some code have tried (request module): var options = { method: 'post', uri: 'https://url', formdata: { 'email': 'email', 'prize': '0', 'transactional': 'on' }, headers: { /* 'content-type': 'application/x-www-form-urlencoded' */ // set automatically } }; rp(options) .then(function (body) { console.log(body) }) .catch(function (err) { console.log(err) }); when fetch content...
Read more

javascript - Replicate keyboard event with html button -

i have tried few ways make happen. have javascript pinball game uses keyboard keys controls. converting application touch screen display. workaround, hoping overlay buttons when clicked simulate keyboard strokes. have done research , sounds should work. using jquery v3.2.1 here things have tried far... html element: <input type="button" class="coil"></input> $('.coil').trigger({type: 'keydown', which: 40, keycode: 40}); with this, not errors, nothing happens. var coilkey = $('body').keydown(function(e) { switch (e.keycode) { case 40: break;} }) $('.coil').click(coilkey); this 1 returns error in console... ((jquery.event.special[handleobj.origtype] || (intermediate value)).handle || handleobj.handler).apply not function below javascript game engine handles key listeners... addkeylistener: function (keyandlistener) { this.keylisteners.push(keyandlistener); }, // gi...
Read more

javascript - Web audio api 5.1 surround example not working in firefox -

i've been playing lott lately web audio api on both firefox , chrome. few days ago started experiment surround set. when trying surround audio in web audio api came notice example works fine in chrome v59 not in firefox v54. // create web audio api context var audioctx = new (window.audiocontext || window.webkitaudiocontext)(); audioctx.destination.channelinterpretation = 'discrete'; audioctx.destination.channelcountmode = 'explicit'; audioctx.destination.channelcount = 6; var oscillators = []; var merger = audioctx.createchannelmerger(6); console.log(audioctx.destination, merger); //merger.channelinterpretation = 'discrete'; //merger.channelcountmode = 'explicit'; //merger.channelcount = 6; var addoscilator = function(channel, frequency) { var oscillator = audioctx.createoscillator(); oscillator.frequency.value = frequency; // value in hertz oscillator.connect(merger,0,channel); oscillator.start(); oscillators.push(o...
Read more