| Server IP : 78.140.185.180 / Your IP : 216.73.216.45 Web Server : LiteSpeed System : Linux cpanel13.v.fozzy.com 4.18.0-513.11.1.lve.el8.x86_64 #1 SMP Thu Jan 18 16:21:02 UTC 2024 x86_64 User : builderbox ( 1072) PHP Version : 7.3.33 Disable Function : NONE MySQL : OFF | cURL : ON | WGET : ON | Perl : ON | Python : ON | Sudo : OFF | Pkexec : OFF Directory : /home/builderbox/www/vendor/rackspace/php-opencloud/doc/_build/html/services/queues/ |
Upload File : |
<!DOCTYPE html>
<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>1. Introduction — php-opencloud 1.12.1 documentation</title>
<link href='https://fonts.googleapis.com/css?family=Lato:400,700|Roboto+Slab:400,700|Inconsolata:400,700' rel='stylesheet' type='text/css'>
<link rel="stylesheet" href="../../_static/css/theme.css" type="text/css" />
<link rel="top" title="php-opencloud 1.12.1 documentation" href="../../index.html"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/modernizr/2.6.2/modernizr.min.js"></script>
</head>
<body class="wy-body-for-nav" role="document">
<div class="wy-grid-for-nav">
<nav data-toggle="wy-nav-shift" class="wy-nav-side">
<div class="wy-side-nav-search">
<a href="../../index.html" class="fa fa-home"> php-opencloud</a>
<div role="search">
<form id ="rtd-search-form" class="wy-form" action="../../search.html" method="get">
<input type="text" name="q" placeholder="Search docs" />
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
</div>
</div>
<div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="main navigation">
<ul>
<li class="toctree-l1"><a class="reference internal" href="../autoscale/index.html">Auto Scale v2</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../autoscale/index.html#setup">Setup</a></li>
<li class="toctree-l2"><a class="reference internal" href="../autoscale/index.html#operations">Operations</a></li>
<li class="toctree-l2"><a class="reference internal" href="../autoscale/index.html#glossary">Glossary</a></li>
<li class="toctree-l2"><a class="reference internal" href="../autoscale/index.html#further-links">Further Links</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../compute/index.html">Compute v2</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../compute/index.html#setup">Setup</a></li>
<li class="toctree-l2"><a class="reference internal" href="../compute/index.html#operations">Operations</a></li>
<li class="toctree-l2"><a class="reference internal" href="../compute/index.html#glossary">Glossary</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Databases v1</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../database/index.html#setup">Setup</a></li>
<li class="toctree-l2"><a class="reference internal" href="../database/index.html#operations">Operations</a></li>
<li class="toctree-l2"><a class="reference internal" href="../database/index.html#glossary">Glossary</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../dns/index.html">DNS v1</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../dns/index.html#setup">Setup</a></li>
<li class="toctree-l2"><a class="reference internal" href="../dns/index.html#operations">Operations</a></li>
<li class="toctree-l2"><a class="reference internal" href="../dns/index.html#glossary">Glossary</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../identity/index.html">Identity v2</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../identity/index.html#setup">Setup</a></li>
<li class="toctree-l2"><a class="reference internal" href="../identity/index.html#operations">Operations</a></li>
<li class="toctree-l2"><a class="reference internal" href="../identity/index.html#glossary">Glossary</a></li>
</ul>
</li>
</ul>
</div>
</nav>
<section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
<nav class="wy-nav-top" role="navigation" aria-label="top navigation">
<i data-toggle="wy-nav-top" class="fa fa-bars"></i>
<a href="../../index.html">php-opencloud</a>
</nav>
<div class="wy-nav-content">
<div class="rst-content">
<div role="navigation" aria-label="breadcrumbs navigation">
<ul class="wy-breadcrumbs">
<li><a href="../../index.html">Docs</a> »</li>
<li>1. Introduction</li>
<li class="wy-breadcrumbs-aside">
<a href="../../_sources/services/queues/Claim.md.txt" rel="nofollow"> View page source</a>
</li>
</ul>
<hr/>
</div>
<div role="main">
<div class="section" id="introduction">
<h1>1. Introduction<a class="headerlink" href="#introduction" title="Permalink to this headline">¶</a></h1>
<p>A <strong>Claim</strong> is the process of a worker checking out a message to perform
a task. Claiming a message prevents other workers from attempting to
process the same messages.</p>
</div>
<div class="section" id="setup">
<h1>2. Setup<a class="headerlink" href="#setup" title="Permalink to this headline">¶</a></h1>
<p>A Claim is initialized on its parent object, a Queue:</p>
<div class="code php highlight-python"><div class="highlight"><pre>// To initialize an empty object:
$claim = $queue->getClaim();
// or retrieve a specific claim:
$claim = $queue->getClaim('51db7067821e727dc24df754');
</pre></div>
</div>
</div>
<div class="section" id="claim-messages">
<h1>3. Claim messages<a class="headerlink" href="#claim-messages" title="Permalink to this headline">¶</a></h1>
<div class="section" id="description">
<h2>3.1 Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
<p>This operation claims a set of messages (up to the value of the limit
parameter) from oldest to newest and skips any messages that are already
claimed. If no unclaimed messages are available, the API returns a
<tt class="docutils literal"><span class="pre">204</span> <span class="pre">No</span> <span class="pre">Content</span></tt> message.</p>
<p>When a client (worker) finishes processing a message, it should delete
the message before the claim expires to ensure that the message is
processed only once. As part of the delete operation, workers should
specify the claim ID (which is best done by simply using the provided
href). If workers perform these actions, then if a claim simply expires,
the server can return an error and notify the worker of the race
condition. This action gives the worker a chance to roll back its own
processing of the given message because another worker can claim the
message and process it.</p>
<p>The age given for a claim is relative to the server’s clock. The claim’s
age is useful for determining how quickly messages are getting processed
and whether a given message’s claim is about to expire.</p>
<p>When a claim expires, it is released. If the original worker failed to
process the message, another client worker can then claim the message.</p>
</div>
<div class="section" id="attributes">
<h2>3.2 Attributes<a class="headerlink" href="#attributes" title="Permalink to this headline">¶</a></h2>
<p>The <tt class="docutils literal"><span class="pre">ttl</span></tt> attribute specifies how long the server waits before
releasing the claim. The ttl value must be between 60 and 43200 seconds
(12 hours). You must include a value for this attribute in your request.</p>
<p>The <tt class="docutils literal"><span class="pre">grace</span></tt> attribute specifies the message grace period in seconds.
The value of grace value must be between 60 and 43200 seconds (12
hours). You must include a value for this attribute in your request. To
deal with workers that have stopped responding (for up to 1209600
seconds or 14 days, including claim lifetime), the server extends the
lifetime of claimed messages to be at least as long as the lifetime of
the claim itself, plus the specified grace period. If a claimed message
would normally live longer than the grace period, its expiration is not
adjusted.</p>
<p>The <tt class="docutils literal"><span class="pre">limit</span></tt> attribute specifies the number of messages to return, up
to 20 messages. If limit is not specified, limit defaults to 10. The
limit parameter is optional.</p>
</div>
<div class="section" id="code">
<h2>3.3 Code<a class="headerlink" href="#code" title="Permalink to this headline">¶</a></h2>
<div class="code php highlight-python"><div class="highlight"><pre>use OpenCloud\Common\Constants\Datetime;
$queue->claimMessages(array(
'limit' => 15,
'grace' => 5 * Datetime::MINUTE,
'ttl' => 5 * Datetime::MINUTE
));
</pre></div>
</div>
</div>
</div>
<div class="section" id="query-claim">
<h1>4. Query claim<a class="headerlink" href="#query-claim" title="Permalink to this headline">¶</a></h1>
<div class="section" id="id1">
<h2>4.1 Description<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h2>
<p>This operation queries the specified claim for the specified queue.
Claims with malformed IDs or claims that are not found by ID are
ignored.</p>
</div>
<div class="section" id="id2">
<h2>4.2 Attributes<a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h2>
<p>Claim ID.</p>
</div>
<div class="section" id="id3">
<h2>4.3 Code<a class="headerlink" href="#id3" title="Permalink to this headline">¶</a></h2>
<div class="code php highlight-python"><div class="highlight"><pre>$claim = $queue->getClaim('51db7067821e727dc24df754');
</pre></div>
</div>
</div>
</div>
<div class="section" id="update-claim">
<h1>5. Update claim<a class="headerlink" href="#update-claim" title="Permalink to this headline">¶</a></h1>
<div class="section" id="id4">
<h2>5.1 Description<a class="headerlink" href="#id4" title="Permalink to this headline">¶</a></h2>
<p>This operation updates the specified claim for the specified queue.
Claims with malformed IDs or claims that are not found by ID are
ignored.</p>
<p>Clients should periodically renew claims during long-running batches of
work to avoid losing a claim while processing a message. The client can
renew a claim by executing this method on a specific <strong>Claim</strong> and
including a new TTL. The API will then reset the age of the claim and
apply the new TTL.</p>
</div>
<div class="section" id="id5">
<h2>5.2 Attributes<a class="headerlink" href="#id5" title="Permalink to this headline">¶</a></h2>
<p>See section 4.2.</p>
</div>
<div class="section" id="id6">
<h2>5.3 Code<a class="headerlink" href="#id6" title="Permalink to this headline">¶</a></h2>
<div class="code php highlight-python"><div class="highlight"><pre>use OpenCloud\Common\Constants\Datetime;
$claim->update(array(
'ttl' => 10 * Datetime::MINUTE
));
</pre></div>
</div>
</div>
</div>
<div class="section" id="release-claim">
<h1>6. Release claim<a class="headerlink" href="#release-claim" title="Permalink to this headline">¶</a></h1>
<div class="section" id="id7">
<h2>6.1 Description<a class="headerlink" href="#id7" title="Permalink to this headline">¶</a></h2>
<p>This operation immediately releases a claim, making any remaining
undeleted messages that are associated with the claim available to other
workers. Claims with malformed IDs or claims that are not found by ID
are ignored.</p>
<p>This operation is useful when a worker is performing a graceful
shutdown, fails to process one or more messages, or is taking longer
than expected to process messages, and wants to make the remainder of
the messages available to other workers.</p>
</div>
<div class="section" id="id8">
<h2>6.2 Attributes<a class="headerlink" href="#id8" title="Permalink to this headline">¶</a></h2>
<p>See section 4.2.</p>
</div>
<div class="section" id="id9">
<h2>6.3 Code<a class="headerlink" href="#id9" title="Permalink to this headline">¶</a></h2>
<div class="code php highlight-python"><div class="highlight"><pre>$message->delete();
</pre></div>
</div>
</div>
</div>
</div>
<footer>
<hr/>
<div role="contentinfo">
<p>
© Copyright 2015, Jamie Hannaford, Shaunak Kashyap.
</p>
</div>
<a href="https://github.com/snide/sphinx_rtd_theme">Sphinx theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>
</footer>
</div>
</div>
</section>
</div>
<script type="text/javascript">
var DOCUMENTATION_OPTIONS = {
URL_ROOT:'../../',
VERSION:'1.12.1',
COLLAPSE_INDEX:false,
FILE_SUFFIX:'.html',
HAS_SOURCE: true
};
</script>
<script type="text/javascript" src="../../_static/jquery.js"></script>
<script type="text/javascript" src="../../_static/underscore.js"></script>
<script type="text/javascript" src="../../_static/doctools.js"></script>
<script type="text/javascript" src="../../_static/js/theme.js"></script>
<script type="text/javascript">
jQuery(function () {
SphinxRtdTheme.StickyNav.enable();
});
</script>
</body>
</html>