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<div class="breadcrumb"><h2 class="element-invisible">You are here</h2><nav class="breadcrumb"><a href="index.html">Home</a> » <a href="techdoc.html" title="Technical Documentation">Technical Documentation</a> » Concurrency Control</nav></div>
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<h1 class="title" id="page-title">Concurrency Control</h1> <div class="region region-content">
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<span property="dc:title" content="Concurrency Control" class="rdf-meta element-hidden"></span><span property="sioc:num_replies" content="0" datatype="xsd:integer" class="rdf-meta element-hidden"></span>
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<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even" property="content:encoded"><div>To support a writing collaboration of multiple users, Saros uses the <strong>Jupiter algorithm for concurrency control</strong>. The Concurrency Control keeps all shared data of the participants of a Saros session consistent.</div>
<a name="top" class="toc-filter-top"></a><div class="toc-filter toc-filter-bullet"><div class="toc-filter-content"><div class="item-list"><ul class="toc-filter-links"><li class="first"><a href="concurrency.html#-a-name-overview-id-overview-a-overview">Overview</a></li>
<li><a href="concurrency.html#-a-name-jupiter-id-jupiter-a-jupiter">Jupiter</a></li>
<li><a href="concurrency.html#-a-name-management-id-management-a-management"> Management</a></li>
<li class="last"><a href="concurrency.html#-a-name-watchdog-id-watchdog-a-watchdog"> Watchdog</a></li>
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<hr /><div class="toc-filter-back-to-top first"><a href="concurrency.html#top">Back to top</a></div><h2 class="toc-header toc-header-bullet"><a name="-a-name-overview-id-overview-a-overview" id="-a-name-overview-id-overview-a-overview" class="toc-bookmark" rel="bookmark" title="Overview"></a><a name="Overview" id="Overview"></a>Overview</h2>
<p><img alt="" src="http://saros-build.imp.fu-berlin.de/img/architecture/concurrent.svg" /></p>
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<div class="toc-filter-back-to-top"><a href="concurrency.html#top">Back to top</a></div><h2 class="toc-header toc-header-bullet"><a name="-a-name-jupiter-id-jupiter-a-jupiter" id="-a-name-jupiter-id-jupiter-a-jupiter" class="toc-bookmark" rel="bookmark" title="Jupiter"></a><a name="Jupiter" id="Jupiter"></a>Jupiter</h2>
<div>The functionality of the Jupiter package is based on the Jupiter algorithm taken from the Open Source project <a href="http://sourceforge.net/projects/ace/" target="_top">ACE</a><a href="http://sourceforge.net/projects/ace/"> </a>(A Collaborative Editor).</div>
<div>The <tt><span style="font-size: 12px; ">Jupiter </span></tt>class implements the <strong>client-side core</strong> of the Jupiter control algorithm.</div>
<div>It generates <tt>JupiterActivities </tt><strong>for local operations</strong> and transforms received <tt>JupiterActivities </tt>into operations <strong>that need to be executed locally</strong>. <strong>Operations are changes</strong> made on a document.</div>
<div>An operation contains <strong>what has changed</strong> and the position <strong>where it was changed</strong>.</div>
<div>These changes made by multiple participants of a Saros session need to be <strong>executed in the correct order</strong> and position by all participants so that they all have the <strong>same consistent copy</strong> of this changed workspace.</div>
<div> </div>
<div>
<table style="width: 700px; " border="1" cellpadding="1" cellspacing="1"><caption>Example</caption>
<tbody><tr><td><span style="font-size: 12px; ">Both participants of a Saros session C and S start with the text "<span style="color:#0000ff;">abc</span>". C performs an <strong>insert operation</strong> <tt>insert(0,"<span style="color:#0000ff;">def</span>")</tt> and S performs an <strong>delete operation</strong> <tt>delete(1,"<span style="color:#0000ff;">b</span>")</tt>. The resulting text is "<span style="color:#0000ff;">defac</span>". Since the local operation <strong>is performed immediately</strong> at each participants side, the received operation of the other participant <strong>is transformed to ensure the consistency</strong>. Therefore for participant C the delete operation is transformed into <tt>delete(4,"<span style="color:#0000ff;">b</span>")</tt>. For participant S the transformation doesn't change the insert operation.</span></td>
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<div class="toc-filter-back-to-top"><a href="concurrency.html#top">Back to top</a></div><h2 class="toc-header toc-header-bullet"><a name="-a-name-management-id-management-a-management" id="-a-name-management-id-management-a-management" class="toc-bookmark" rel="bookmark" title=" Management"></a><a name="Management" id="Management"></a> Management</h2>
<div>The subpackage <tt>management </tt>is responsible for <strong>managing the state of the shared workspace</strong> in a Saros session.</div>
<div>Every user with <strong>write-access</strong> sends their <tt>JupiterActivities </tt>to the <tt>ConcurrentDocumentServer </tt>located on the host side where they are <strong>transformed and sent to everybody else</strong>.</div>
<div>The transformed <tt>JupiterActivities </tt>are <strong>received and transformed</strong> to <tt>TextEditActivities </tt>in the <tt>ConcurrentDocumentClient </tt>for execution on the <strong>client side</strong>.</div>
<div>The <strong>host</strong> of the session is always responsible for <strong>managing the state of all projects</strong> (or <strong>files</strong>), even when a client adds projects or files to the Saros session.</div>
<div><br /><div>
<div class="toc-filter-back-to-top"><a href="concurrency.html#top">Back to top</a></div><h2 class="toc-header toc-header-bullet"><a name="-a-name-watchdog-id-watchdog-a-watchdog" id="-a-name-watchdog-id-watchdog-a-watchdog" class="toc-bookmark" rel="bookmark" title=" Watchdog"></a><a name="Watchdog" id="Watchdog"></a> Watchdog</h2>
<div>The consistency <tt>Watchdog </tt>is responsible for <strong>monitoring the states</strong> of all participant's workspaces and to <strong>recover from inconsistent states</strong> between the participants of a Saros session.</div>
<div><strong>For all opened files</strong> anywhere in the shared session (host and clients) <strong>checksums are generated periodically</strong> (every 10 seconds) on the host side. The basis for these checksums are the current contents of the editors, <em>not </em>the content of the files as they are written on the harddrive.</div>
<div>These <strong>checksums are sent to all clients</strong> and the clients check their <strong>locally generated checksums against them</strong>.</div>
<div>If an<strong> inconsistency is detected</strong> the <strong>inconsistency state is set</strong> and the user of the session gets informed (the yellow triangle on the Saros View).</div>
<div>When the user wants to <strong>recover from that inconsistency</strong> a <tt>ChecksumError </tt>is <strong>sent to the host</strong> and <strong>waited</strong> for the reply.</div>
<div>The user receives the <strong>file changes from the host</strong>.</div>
<div>The host can <strong>never be in an inconsistent state</strong>.</div>
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