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index.html
<!DOCTYPE html>
<html>
<head>
<title>Foo</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" />
<style type='text/css'>
body {
font-family: 'Helvetica Neue';
background:#000;
background-size:100%;
color:#fff;
margin:0;
padding:.5em;
}
h1, h2, h3, p {
margin:0;
font-weight:200;
}
p, li {
margin-bottom: .5em;
}
code {
font-family: "Menlo", monospace;
letter-spacing: 0;
}
em, i {
font-weight: 200;
}
strong, b {
font-weight: 400;
}
mark {
color: orange;
}
a {
background: orange;
color:#000;
text-decoration:none;
}
img {
width:100%;
}
div {
cursor:pointer;
cursor:hand;
position:absolute;
top:0;
left:0;
}
ol, ul {
list-style-type: none;
margin: 0.5em 0;
padding: 0;
}
ul ul, ul ol, ol ol, ol ul {
margin-left: .5em;
}
ol li:before, ul li:before {
color: orange;
}
ol {
counter-reset: list -1;
}
ol li {
list-style-type: none;
counter-increment: list;
}
ol li:before {
content: counter(list, binary) " ";
}
ul li:before {
content: "- ";
}
/*
Sunburst-like style (c) Vasily Polovnyov <[email protected]>
*/
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display: block; padding: 0.5em;
background: #000; color: #f8f8f8;
}
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color: #aeaeae;
font-style: italic;
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color: #E28964;
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</style>
<script type='text/javascript'>
window.onload = function() {
var s = document.getElementsByTagName('div'), cur = 0;
if (!s) return;
function go(n) {
cur = n;
var i = 1e3, e = s[n];
for (var k = 0; k < s.length; k++) s[k].style.display = 'none';
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e.style.fontSize = i + 'px';
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document.body.style.backgroundImage = 'url(' + e.firstChild.src + ')';
e.firstChild.style.display = 'none';
} else {
document.body.style.backgroundImage = '';
document.body.style.backgroundColor = e.style.backgroundColor;
}
while (
e.offsetWidth > window.innerWidth ||
e.offsetHeight > window.innerHeight) {
e.style.fontSize = (i -= 10) + 'px';
if (i < 0) break;
}
e.style.marginTop = ((window.innerHeight - e.offsetHeight) / 2) + 'px';
if (window.location.hash !== n) window.location.hash = n;
document.title = e.textContent || e.innerText;
}
document.onclick = function() {
go(++cur % (s.length));
};
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(e.which === 39) && go(Math.min(s.length - 1, ++cur));
(e.which === 37) && go(Math.max(0, --cur));
};
function parse_hash() {
return Math.max(Math.min(
s.length - 1,
parseInt(window.location.hash.substring(1), 10)), 0);
}
if (window.location.hash) cur = parse_hash() || cur;
window.onhashchange = function() {
var c = parse_hash();
if (c !== cur) go(c);
};
go(cur);
};
</script></head><body>
<div><h1>Azure Service Bus Correlation</h1>
</div>
<div><p>Correlation? WTF?</p>
</div>
<div><blockquote>
<p>&quot;I haz many fings to do that must work togeva.&quot;</p>
</blockquote>
</div>
<div><h2>It&#39;s all about <code>SessionId</code></h2>
<pre><code class="lang-javascript">var msg = new BrokeredMessage()<span class="comment">;</span>
msg<span class="preprocessor">.SessionId</span> = <span class="string">"kitteh!"</span><span class="comment">;</span></code></pre>
</div>
<div><h1>So what does that mean?</h1>
</div>
<div><p>Azure promises:</p>
<ul>
<li>FIFO.</li>
<li>Consistent session state</li>
<li>Receivers can still die.</li>
</ul>
</div>
<div><p>What this means for us:</p>
<ul>
<li>&quot;Jobs&quot; (e.g. <em>&quot;scrape&quot;</em>) tracked as whole.</li>
<li>Easier reporting &amp; management.</li>
<li>Developer sanity.</li>
</ul>
</div>
<div><h2>Key points</h2>
<ul>
<li>Queues <em>must</em> require Sessions.</li>
<li><code>msg.SessionId</code> <em>must</em> be set on Session Queues.</li>
<li>Don&#39;t do either and world ends.</li>
<li>Do none and no sessions :)</li>
</ul>
</div>
<div><pre><code class="lang-csharp"><span class="keyword">var</span> qd = <span class="keyword">new</span> QueueDescription(name)
{
<span class="comment">/* Create Session Queue */</span>
RequiresSession = <span class="keyword">true</span>
};</code></pre>
</div>
<div><p>Morph handles transparently in <a href="https://github.com/MoBank/MoPowered.Morph/blob/add-sessions-api/src/MoPowered.Morph/Processing/ProcessingService.cs">ProcessingService</a>:</p>
<pre><code class="lang-csharp">var message = <span class="built_in">x</span><span class="preprocessor">.ToMessage</span>()<span class="comment">;</span>
message<span class="preprocessor">.SessionId</span> = sessionId<span class="comment">;</span>
return Client<span class="preprocessor">.SendAsync</span>(message)<span class="comment">;</span></code></pre>
</div>
<div><p>Any <code>Job</code>&#39;s queued or spawned will have their Session ID set for you.</p>
</div>
<div><p>Questions?</p>
</div>
<div><p><img src="http://static.fjcdn.com/gifs/Dancing_452c8b_395735.gif" alt="Kitteh"></p>
</div>
Raw
slides.md

Azure Service Bus Correlation

Correlation? WTF?

"I haz many fings to do that must work togeva."

It's all about SessionId

var msg = new BrokeredMessage();
msg.SessionId = "kitteh!";

So what does that mean?

Azure promises:

  • FIFO.
  • Consistent session state
  • Receivers can still die.

What this means for us:

  • "Jobs" (e.g. "scrape") tracked as whole.
  • Easier reporting & management.
  • Developer sanity.

Key points

  • Queues must require Sessions.
  • msg.SessionId must be set on Session Queues.
  • Don't do either and world ends.
  • Do none and no sessions :)
var qd = new QueueDescription(name)
{
    /* Create Session Queue */
    RequiresSession = true
};

Morph handles transparently in ProcessingService:

var message = x.ToMessage();
message.SessionId = sessionId;
return Client.SendAsync(message);

Any Job's queued or spawned will have their Session ID set for you.

Questions?

Kitteh

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