Space-based architecture

<h2 id="history">History</h2>
<p>Space-based architecture (SBA) was originally invented and developed at Microsoft in 1997–98. Internally at Microsoft it was known as Youkon Distributed Caching platform (YDC). The first large web projects based on it were MSN Live Search (released in Sept. 1999) and later MSN customer marketing data store (multi-terabyte in-memory DB shared by all MSN sites) as well as a number of other MSN sites released in late 1990s and early 2000s. See US patents 6,453,404 and 6,449,695:
<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a>  
<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a>
and other patents based on these:<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a>
</p>
<h2 id="components-of-space-based-architecture">Components of space-based architecture</h2>
<p>An application built on the principles of space-based architecture typically has the following components:
</p>
Processing unit
The unit of scalability and fail-over. Normally, a processing unit is built out of a <a href="/facts/Plain_Old_Java_Object/sTUnd6MN">POJO</a> (plain old Java object) container, such as that provided by the <a href="/facts/Spring_Framework/ajIwLM73">Spring Framework</a>.
Virtual middleware
A common runtime and clustering model, used across the entire <a href="/facts/Middleware/HobNosz9">middleware</a> stack. The core middleware components in a typical SBA architecture are:
<table><tbody><tr><th>Component</th><th>Description</th></tr><tr><td>Messaging grid</td><td>Handles the flow of incoming transaction as well as the communication between services</td></tr><tr><td><a href="/facts/Data_grid/h51V24Ek">Data grid</a></td><td>Manages the data in distributed memory with options for synchronizing that data with an underlying database</td></tr><tr><td>Processing grid</td><td>Parallel processing component based on the master/worker pattern (also known as a <a href="/facts/Blackboard_system/zdXSmaqA">blackboard pattern</a>) that enables parallel processing of events among different services</td></tr></tbody></table>
POJO-driven services model
A lightweight services model that can take any standard Java implementation and turn it into a loosely coupled distributed service. The model is ideal for interaction with services that run within the same processing-unit.
SLA-driven container
The SLA-driven container enables the deployment of the application on a dynamic pool of machines based on Service level agreements. SLA definitions include the number of instances that need to run in order to comply with the application scaling and fail-over policies, as well as other policies.
<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Tuple_space/wTjPhDg1">Tuple space</a></li>
<li><a href="/facts/Blackboard_system/zdXSmaqA">Blackboard system</a></li></ul>

<h2 id="literature">Literature</h2>
<p>Articles/papers, technical:
</p>
<ul><li>Xu, Dezheng; Xiaoying Bai; Guilan Dai (2006). <a href="http://csdl2.computer.org/persagen/DLAbsToc.jsp?resourcePath=/dl/proceedings/&toc=comp/proceedings/sose/2006/2726/00/2726toc.xml&DOI=10.1109/SOSE.2006.6">"A Tuple-Space-Based Coordination Architecture for Test Agents in the MAST Framework"</a> (PDF). <i>2006 Second IEEE International Symposium on Service-Oriented System Engineering (SOSE'06)</i>. Tsinghua University, China. pp. 57–66. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1109%2FSOSE.2006.6">10.1109/SOSE.2006.6</a>. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 0-7695-2726-4. <a href="/facts/S2CID_(identifier)/ldJsHa2Y">S2CID</a> <a href="https://api.semanticscholar.org/CorpusID:19977346">19977346</a>.</li>
<li>Engelhardtsen, Fritjof Boger; Tommy Gagnes (2002). <a href="http://www.nik.no/2002/Engelhardtsen.pdf">"Using JavaSpaces to create adaptive distributed systems"</a> (PDF). Agder University College, Norway.</li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>United States Patent: 6453404 <a href="http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1=%22Bereznyi%3B+Alexandre%22&s2=cache&OS=%22Bereznyi;+Alexandre%22+AND+cache&RS=%22Bereznyi;+Alexandre%22+AND+cache" target="_blank">http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1=%22Bereznyi%3B+Alexandre%22&s2=cache&OS=%22Bereznyi;+Alexandre%22+AND+cache&RS=%22Bereznyi;+Alexandre%22+AND+cache</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>United States Patent: 6449695 <a href="http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=2&f=G&l=50&co1=AND&d=PTXT&s1=%22Bereznyi%3B+Alexandre%22&s2=cache&OS=%22Bereznyi;+Alexandre%22+AND+cache&RS=%22Bereznyi;+Alexandre%22+AND+cache" target="_blank">http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=2&f=G&l=50&co1=AND&d=PTXT&s1=%22Bereznyi%3B+Alexandre%22&s2=cache&OS=%22Bereznyi;+Alexandre%22+AND+cache&RS=%22Bereznyi;+Alexandre%22+AND+cache</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>"Patent Database Search Results: Bereznyi in US Patent Collection". <a href="http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=0&f=S&l=50&TERM1=Bereznyi&FIELD1=&co1=AND&TERM2=&FIELD2=&d=PTXT" target="_blank">http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=0&f=S&l=50&TERM1=Bereznyi&FIELD1=&co1=AND&TERM2=&FIELD2=&d=PTXT</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
</ol>

Space-based architecture open-in-new

Space-based architecture