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performance.js
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performance.js
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(function(){
var UNI = 1;
function now() {return+new Date}
function uni() {return+now()+UNI++}
// ----------------------------------------------------------------------
// PUBLISH A MESSAGE (SEND)
// ----------------------------------------------------------------------
var net = PUBNUB.init({
publish_key : 'demo',
subscribe_key : 'demo',
origin : location.hash.split('#')[1]
})
, channel = 'performance-meter-' + now() + Math.random()
, sent = 0
, last = 0
, mps_avg = 0
, median_display = {}
, lat_avg = 0
, median = [0]
, publish = (function(){
return function( message, callback ) {
if (!net) return;
net.publish({
channel : channel,
message : {
last : sent++,
start : now()
},
callback : function(info) {
info && info[0] || publish( message, callback );
callback && callback(info);
}
});
};
})();
// ----------------------------------------------------------------------
// SUBSCRIBE FOR MESSAGES (RECEIVE)
// ----------------------------------------------------------------------
net.subscribe({
channel : channel,
callback : function( msg, envelope ) {
if (last >= msg.last) return;
last = msg.last;
var start = msg.start
, latency = (now() - start) || median[1]
, new_mps_avg = 1000 / latency;
lat_avg = (latency + lat_avg) / 2;
mps_avg = (new_mps_avg + mps_avg) / 2;
median.push(latency);
}
});
setInterval( publish, 500 );
setInterval( function() { set_rps(mps_avg) }, 500 );
// ----------------------------------------------------------------------
// CALCULATE MEDIAN VALUES
// ----------------------------------------------------------------------
var median_template = PUBNUB.$('median-template').innerHTML
, median_out = PUBNUB.$('performance-medians');
function update_medians() {
var length = median.length - 1
, medlen = Math.floor(length/2);
function get_median(val) {
return median[medlen + Math.floor(length * val)];
}
function get_median_low(val) {
return median[Math.floor(medlen * val)||1];
}
median = median.sort(function(a,b){return a-b});
median_display = {
'1' : median[1],
'2' : get_median_low(0.02),
'5' : get_median_low(0.05),
'10' : get_median_low(0.1),
'20' : get_median_low(0.2),
'25' : get_median_low(0.5),
'30' : get_median_low(0.6),
'40' : get_median_low(0.8),
'45' : get_median_low(0.9),
'50' : median[medlen],
'66' : get_median(0.16),
'75' : get_median(0.25),
'80' : get_median(0.30),
'90' : get_median(0.40),
'95' : get_median(0.45),
'98' : get_median(0.48),
'99' : get_median(0.49),
'100' : median[length-1]
};
median_out.innerHTML = PUBNUB.supplant(
median_template,
median_display
);
}
update_medians();
// ----------------------------------------------------------------------
// DISPLAY TOTAL MESSAGES SENT/RECEIVED
// ----------------------------------------------------------------------
var performance_sent_template = PUBNUB.$('messages-sent-template').innerHTML
, performance_sent = PUBNUB.$('performance-sent');
function update_messages_received() {
performance_sent.innerHTML = PUBNUB.supplant(
performance_sent_template, {
sent : median.length + 1
}
);
}
// ----------------------------------------------------------------------
// SET RPS FOR DISPLAY
// ----------------------------------------------------------------------
var set_rps = (function() {
var rps = PUBNUB.$('performance-meter-number')
, arrow = PUBNUB.$("performance-arrow");
return function (val) {
var meter = ((-val || 0)*5);
animate( arrow, [ {
d : 0.5,
r : meter < -90 ? -90 : meter
} ] );
rps.innerHTML = ''+Math.floor(lat_avg);
//rps.innerHTML = ''+Math.floor(val);
update_medians();
draw_graph();
update_messages_received();
};
})();
// ----------------------------------------------------------------------
// GRAPH DISPLAY
// ----------------------------------------------------------------------
var draw_graph = (function(){
var graph = PUBNUB.$('performance-graph').getContext("2d")
, height = 50
, barwidth = 35
, bargap = 5
, modrend = 2
, barscale = 2
, position = 0
, bgcolor = "#80cae8"
, fgcolor = "#f2efe3";
// Graph Gradient
var gradient = graph.createLinearGradient( 0, 0, 0, height * 1.2 );
gradient.addColorStop( 0, fgcolor );
gradient.addColorStop( 1, bgcolor );
graph.font = "11px Helvetica";
graph.strokeStyle = '#444';
return function(values) {
// Rate Limit Canvas Painting
if (!(sent % modrend)) return;
// Clear
position = 0;
graph.fillStyle = bgcolor;
graph.fillStyle = fgcolor;
graph.fillRect( 0, 0, 640, height );
// Dynamic Bargraph Display
barscale = (+median_display['98']) / (+median_display['5']) * 0.5;
// Lines
graph.fillStyle = gradient;
PUBNUB.each( median_display, function( key, latency ) {
var height_mod = latency / barscale;
height_mod = height_mod > height ? height : height_mod;
var left = position * (barwidth + bargap) + (bargap / 2)
, top = height - height_mod;
// Draw Bar
graph.fillRect( left, top, barwidth, height );
graph.strokeText(
Math.floor(latency),
left + (barwidth - (""+latency).length * 6) / 2,
(top < 15 ? 15 : top) - 4
);
position++;
} );
};
})();
})();