<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>Hi Palanikumar, looks like you've got a typo there, it's <b>send_interval</b> not <b>sent_interval</b>:</div><div><br></div><div><blockquote type="cite"><div dir="ltr"><font color="#000000"><span style="background-color: rgba(255, 255, 255, 0);">call to undefined function timer:sent_interval(1000, <<"Time announcement from erlang server">>) </span></font></div></blockquote></div><div><br></div><div>On 23 Sep 2017, at 13:34, Palanikumar Gopalakrishnan <<a href="mailto:palani@vahaitech.com">palani@vahaitech.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr"><div>Hi Guys,<br></div> I tried with<b> timer:send_interval/2 </b>, and <b>timer:send _interval/3 </b>also . see my trial and error result . Both them returns<br><br><br>17:54:47.250 [error] CRASH REPORT Process <0.575.0> with 0 neighbours crashed with reason: call to undefined function timer:sent_interval(1000, <<"Time announcement from erlang server">>)<br>17:54:47.250 [error] Ranch listener my_cowboy_ws_server terminated with reason: call to undefined function timer:sent_interval(1000, <<"Time announcement from erlang server">>) <br><br><br> 17:59:06.678 [error] CRASH REPORT Process <0.570.0> with 0 neighbours crashed with reason: call to undefined function timer:sent_interval(1000, <0.570.0>, "Time announcement from erlang server")<br>17:59:06.678 [error] Ranch listener my_cowboy_ws_server terminated with reason: call to undefined function timer:sent_interval(1000, <0.570.0>, "Time announcement from erlang server")<br><br><br><div> <br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 23 September 2017 at 17:00, Igor Clark <span dir="ltr"><<a href="mailto:igor.clark@gmail.com" target="_blank">igor.clark@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<tt>Hi again Palanikumar, check the error message - you're still
calling timer:apply_interval instead of timer:send_interval,
except now you're only passing 2 arguments:<br>
<br>
</tt><tt><span class=""><tt><b>call to undefined function
timer:apply_interval(1000, "Time announcement from erlang
server")</b></tt><tt><br>
</tt><br></span>
Be careful to check the signatures of the functions you're calling
and the argument lists you're providing. This is just basic error
checking ;-)<br>
<br>
NB, please hit "reply to all" in future rather than just "reply",
as you'll include the mailing list, and other people will be able
to help too.<br>
<br>
Cheers<span class="HOEnZb"><font color="#888888"><br>
i<br>
</font></span></tt><div><div class="h5"><br>
<div class="m_7421751256653615869moz-cite-prefix">On 23/09/2017 12:07, Palanikumar
Gopalakrishnan wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>
<div>Hi lgor,<br>
<br>
</div>
I tried with <b>timer:send_interval/2 with this
line<br>
>>> timer:apply_interval(1000, "Time announcement
from erlang server"),</b><br>
<br>
returns the following error<br>
<br>
<b>16:33:20.264 [error] CRASH REPORT Process <0.570.0>
with 0 neighbours crashed with reason: call to undefined
function timer:apply_interval(1000, "Time announcement from
erlang server")<br>
16:33:20.265 [error] Ranch listener my_cowboy_ws_server
terminated with reason: call to undefined function
timer:apply_interval(1000, "Time announcement from erlang
server")<br>
<br>
<br>
</b></div>
same as <b>timer:send_interval/3 </b>throw the error<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On 23 September 2017 at 16:24, Igor
Clark <span dir="ltr"><<a href="mailto:igor.clark@gmail.com" target="_blank">igor.clark@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF"> You could try <tt><a href="http://erlang.org/doc/man/timer.html#send_interval-3" target="_blank">timer:send_interval/3</a>:</tt><br>
<br>
<blockquote type="cite"><tt>send_interval(Time, Pid,
Message)</tt><br>
Evaluates <tt>Pid</tt> ! <tt>Message</tt> repeatedly
after <tt>Time</tt> milliseconds. (<tt>Pid</tt> can
also be an atom of a registered name.)<br>
</blockquote>
<br>
There's even a <a href="http://erlang.org/doc/man/timer.html#send_interval-2" target="_blank"><tt>timer:send_interval/2</tt></a>
that assumes <tt>self()</tt> as the <tt>Pid</tt>, which
looks like it might be what you want<tt>:</tt><br>
<br>
<blockquote type="cite"><tt>send_interval(Time, Message)</tt><br>
Same as <tt>send_interval(Time, self(), Message)</tt>.</blockquote>
<br>
One thing to note though is that the <a href="http://erlang.org/doc/efficiency_guide/commoncaveats.html#id60818" target="_blank">Common Caveats</a>
section says:<br>
<br>
<blockquote type="cite">
<p style="max-width:42em;color:rgb(26,26,26);font-family:sans-serif;font-size:16px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">Creating
timers using<span class="m_7421751256653615869m_333471933988590179Apple-converted-space"> </span><span class="m_7421751256653615869m_333471933988590179bold_code m_7421751256653615869m_333471933988590179bc-13" style="font-family:mono,Courier,monospace;font-weight:bold"><a href="http://erlang.org/doc/man/erlang.html#erlang:send_after-3" style="color:rgb(27,110,194);text-decoration:none" target="_blank">erlang:send_after/3</a></span><span class="m_7421751256653615869m_333471933988590179Apple-converted-space"> </span>and<span class="m_7421751256653615869m_333471933988590179Apple-converted-space"> </span><span class="m_7421751256653615869m_333471933988590179bold_code m_7421751256653615869m_333471933988590179bc-13" style="font-family:mono,Courier,monospace;font-weight:bold"><a href="http://erlang.org/doc/man/erlang.html#erlang:start_timer-3" style="color:rgb(27,110,194);text-decoration:none" target="_blank"><wbr>erlang:start_timer/3</a></span><span class="m_7421751256653615869m_333471933988590179Apple-converted-space"> </span>,
is much more efficient than using the timers provided
by the<span class="m_7421751256653615869m_333471933988590179Apple-converted-space"> </span><span class="m_7421751256653615869m_333471933988590179bold_code m_7421751256653615869m_333471933988590179bc-18" style="font-family:mono,Courier,monospace;font-weight:bold"><a href="http://erlang.org/doc/man/timer.html" style="color:rgb(27,110,194);text-decoration:none" target="_blank">timer</a></span><span class="m_7421751256653615869m_333471933988590179Apple-converted-space"> </span>module
in STDLIB. The<span class="m_7421751256653615869m_333471933988590179Apple-converted-space"> </span><span class="m_7421751256653615869m_333471933988590179code" style="font-family:mono,Courier,monospace;font-weight:normal;background-color:rgb(243,243,243)">timer</span>module
uses a separate process to manage the timers. That
process can easily become overloaded if many processes
create and cancel timers frequently (especially when
using the SMP emulator).</p>
</blockquote>
<br>
I'm not sure if that applies to send_interval/{2,3} as
well, or quite how many "many" means there - I guess it's
probably "a really large number", but perhaps somebody
could jump in here?<br>
<br>
But if so, and if you expect heavy traffic with an
interval like this on every WS connection, an alternative
might be to create a loop to send the message using <tt>send_after/3</tt>
instead of using the <tt>timer</tt> module. I.e. the
process which handles <tt>Msg</tt> could call <tt>erlang:send_after(
Time, self(), Msg )</tt> when it's done its other work.
Working out which process does that would depend on your
app design - it might work to just do it in the process
which handles the message you're sending, or you might
need another process.<br>
<br>
Cheers<span class="m_7421751256653615869HOEnZb"><font color="#888888"><br>
i</font></span>
<div>
<div class="m_7421751256653615869h5"><br>
<br>
<br>
<div class="m_7421751256653615869m_333471933988590179moz-cite-prefix">On
23/09/2017 11:21, Palanikumar Gopalakrishnan wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Hi lgor Clark,<br>
</div>
Thanks for the help. yes
you are correct. Its there any way to send
message to websocket using <b>timer:apply_interval/4</b>.
I didn't find any examples. <br>
<br>
<br>
<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On 23 September 2017 at
15:47, Igor Clark <span dir="ltr"><<a href="mailto:igor.clark@gmail.com" target="_blank">igor.clark@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF"> Hi
Palanikumar,<br>
<br>
It looks like you're passing the <tt><a href="http://erlang.org/doc/man/erlang.html#start_timer-3" target="_blank">erlang:start_timer/3</a></tt>
arguments to <tt><a href="http://erlang.org/doc/man/timer.html#apply_interval-4" target="_blank">timer:apply_interval/4</a></tt>:<br>
<br>
<tt>erlang:start_timer(Time, Dest, Msg)</tt><br>
<br>
vs<br>
<br>
<tt>apply_interval(Time, Module,
Function, Arguments)</tt><br>
<br>
<tt>erlang:start_timer/3</tt> sends <tt>Msg</tt>
to <tt>Dest</tt> after <tt>Time</tt> ms; <tt>timer:apply_interval/4</tt>
calls <tt>Module:Function(Arguments)</tt>
every <tt>Time</tt> ms.<br>
<br>
So the error message is telling you that the
function <tt>timer:apply_interval/3</tt>
you're trying to call doesn't exist.<br>
<br>
HTH,<br>
Igor
<div>
<div class="m_7421751256653615869m_333471933988590179h5"><br>
<br>
<div class="m_7421751256653615869m_333471933988590179m_6431617450298307261moz-cite-prefix">On
23/09/2017 10:50, Palanikumar
Gopalakrishnan wrote:<br>
</div>
</div>
</div>
<blockquote type="cite">
<div>
<div class="m_7421751256653615869m_333471933988590179h5">
<div dir="ltr">
<div>
<div>
<div>
<div>
<div>
<div>Hi Guys,<br>
<br>
</div>
I want to
send message to the
front-end via websocket in
particular time interval.<br>
</div>
So i use timer module for
this purpose.<br>
<b>timer:apply_interval(1000,
self(), <<"How' you
doin'?">>),</b></div>
<div><b><br>
</b></div>
<div><b><br>
</b></div>
But it returns the following
error<br>
<br>
<b>15:18:20.558 [error] CRASH
REPORT Process
<0.570.0> with 0
neighbours crashed with
reason: call to undefined
function
timer:apply_interval(6000,
<0.570.0>,
<<"How' you
doin'?">>)<br>
15:18:20.558 [error] Ranch
listener my_cowboy_ws_server
terminated with reason: call
to undefined function
timer:apply_interval(6000,
<0.570.0>,
<<"How' you
doin'?">>)<br>
<br>
<br>
</b></div>
Its there any way to solve this
problem. <br>
<br>
</div>
I already tried with <br>
<br>
<b>erlang:start_timer(60000,
self(), <<"How' you
doin'?">>)<br>
<br>
</b></div>
Its only send message after
particular timer. I didn't found
method in this module to send
message in particular interval.<br>
<br>
<br>
<br>
<div>
<div><br>
<div><br>
<br>
<div>
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Regards,</b></div>
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