SherbyNet - /page/wikibook/entry.mu

Micron Document

<!DOCTYPE html>

<title>Software component</title>

</head>

<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Software component</span></span>

</h1>

</header>

<p>A <b>software component</b> is a <a href="Modular_design" title="Modular design">modular</a> unit of <a href="Software" title="Software">software</a> that <a href="Separation_of_concerns" title="Separation of concerns">encapsulates</a> specific functionality.<sup id="cite_ref-pandey_1-0" class="reference"><a href="#cite_note-pandey-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The desired characteristics of a component are <a href="Reusability" title="Reusability">reusability</a> and <a href="Maintainability" title="Maintainability">maintainability</a>.<sup id="cite_ref-pandey_1-1" class="reference"><a href="#cite_note-pandey-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading2"><h2 id="Value">Value</h2></div>

<p>Components allow <a href="Software_development" title="Software development">software development</a> to assemble software with reliable parts rather than writing <a href="Source_code" title="Source code">code</a> for every aspect; allowing for <a href="Systems_development_life_cycle" title="Systems development life cycle">implementation</a> to be more like factory assembly than custom building.

</p>

<div class="mw-heading mw-heading2"><h2 id="Attributes">Attributes</h2></div>

<p>Desirable attributes of a component include but are not limited to:

</p>

<ul><li><a href="Cohesion_(computer_science)" title="Cohesion (computer science)">Cohesive</a> – <a href="Encapsulation_(computer_programming)" title="Encapsulation (computer programming)">encapsulates</a> related <a href="Function_(computer_science)" class="mw-redirect" title="Function (computer science)">functionality</a></li></ul>

<ul><li><a href="Reusability" title="Reusability">Reusable</a></li></ul>

<ul><li><a href="Robustness_(computer_science)" title="Robustness (computer science)">Robust</a></li></ul>

<ul><li><i>Substitutable</i> – can be replaced by another component with the same interface</li></ul>

<ul><li><a href="Software_documentation" title="Software documentation">Documented</a></li></ul>

<ul><li><a href="Software_testing" title="Software testing">Tested</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="Third-party">Third-party</h2></div>

<p>Some components are built in-house by the same organization or team building the <a href="Software_system" title="Software system">software system</a>. Some are <a href="Third-party_software_component" title="Third-party software component">third-party</a>, developed elsewhere and assembled into the software system.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading2"><h2 id="Component-based_software_engineering">Component-based software engineering</h2></div>

<p>For large-scale systems, <a href="Component-based_software_engineering" title="Component-based software engineering">component-based development</a> encourages a disciplined process to manage <a href="Programming_complexity" title="Programming complexity">complexity</a>.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading2"><h2 id="Framework">Framework</h2></div>

<p>Some components conform to a framework technology that allows them to be consumed in a well-known way. Examples include: <a href="Common_Object_Request_Broker_Architecture" title="Common Object Request Broker Architecture">CORBA</a>, <a href="Component_Object_Model" title="Component Object Model">COM</a>, <a href="Enterprise_JavaBeans" class="mw-redirect" title="Enterprise JavaBeans">Enterprise JavaBeans</a>, and the <a href=".NET_Framework" title=".NET Framework">.NET Framework</a>.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading2"><h2 id="Modeling">Modeling</h2></div>

<p>Component design is often modeled visually. In <a href="Unified_Modeling_Language" title="Unified Modeling Language">Unified Modeling Language</a> (UML) 2.0 a component is shown as a rectangle, and an interface is shown as a lollipop to indicate a provided interface and as a socket to indicate consumption of an interface.

</p>

<div class="mw-heading mw-heading2"><h2 id="History">History</h2></div>

<p>The idea of <a href="Reusability" title="Reusability">reusable</a> software components was promoted by <a href="Douglas_McIlroy" title="Douglas McIlroy">Douglas McIlroy</a> in his presentation at the <a href="NATO_Software_Engineering_Conferences" title="NATO Software Engineering Conferences">NATO Software Engineering Conference</a> of 1968.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> (One goal of that conference was to resolve the so-called <a href="Software_crisis" title="Software crisis">software crisis</a> of the time.) In the 1970s, McIlroy put this idea into practice with the addition of the <a href="Pipeline_(Unix)" title="Pipeline (Unix)">pipeline</a> feature to the <a href="Unix" title="Unix">Unix</a> <a href="Operating_system" title="Operating system">operating system</a>.

</p><p><a href="Brad_Cox" title="Brad Cox">Brad Cox</a> refined the concept of a software component in the 1980s.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> He attempted to create an infrastructure and market for reusable third-party components by inventing the <a href="Objective-C" title="Objective-C">Objective-C</a> programming language.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup>

</p><p><a href="IBM" title="IBM">IBM</a> introduced <a href="IBM_System_Object_Model" title="IBM System Object Model">System Object Model</a> (SOM) in the early 1990s.<sup id="cite_ref-claims_9-0" class="reference"><a href="#cite_note-claims-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup>

</p><p><a href="Microsoft" title="Microsoft">Microsoft</a> introduced <a href="Component_Object_Model" title="Component Object Model">Component Object Model</a> (COM)

in the early 1990s. Microsoft built many domain-specific component technologies on COM, including <a href="Distributed_Component_Object_Model" title="Distributed Component Object Model">Distributed Component Object Model</a> (DCOM), <a href="Object_Linking_and_Embedding" title="Object Linking and Embedding">Object Linking and Embedding</a> (OLE), and ActiveX.

</p>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

/* start https://en.wikipedia.org/ */

.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}

/* end https://en.wikipedia.org/ */

</style><div class="reflist">

/* start https://en.wikipedia.org/ */

.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("./mw/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("./mw/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("./mw/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("./mw/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}

/* end https://en.wikipedia.org/ */

</style><cite id="CITEREFPandey2023" class="citation web cs1">Pandey, Pankaj (11 July 2023). <a rel="nofollow" class="external text" href="https://medium.com/@publicapplicationcenter/tutorial-notes-software-components-and-connectors-a425bfd984df">"Tutorial notes: Software Components and Connectors"</a>. <i>medium.com</i><span class="reference-accessdate">. Retrieved <span class="nowrap">14 May</span> 2024</span>.</cite></span>

</li>

<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><cite id="CITEREFYadav2024" class="citation web cs1">Yadav, Sunny (16 April 2024). <a rel="nofollow" class="external text" href="https://www.linkedin.com/pulse/types-software-components-examples-sunny-yadav-ducaf">"Types of Software Components — With Examples"</a>. <i><a href="LinkedIn" title="LinkedIn">LinkedIn</a></i><span class="reference-accessdate">. Retrieved <span class="nowrap">14 May</span> 2024</span>.</cite></span>

</li>

<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><cite id="CITEREFDouglas_C._Schmidt" class="citation web cs1"><a href="Douglas_C._Schmidt" title="Douglas C. Schmidt">Douglas C. Schmidt</a>. <a rel="nofollow" class="external text" href="http://www.dre.vanderbilt.edu/~schmidt/reuse-lessons.html">"Why Software Reuse has Failed and How to Make It Work for You"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">14 May</span> 2024</span>.</cite></span>

</li>

<li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><cite id="CITEREFCrnkovicSentillesVulgarakisChaudron2011" class="citation journal cs1">Crnkovic, I.; Sentilles, S.; Vulgarakis, A.; Chaudron, M. R. V. (2011). "A Classification Framework for Software Component Models". <i>IEEE Transactions on Software Engineering</i>. <b>37</b> (5): <span class="nowrap">593–</span>615. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1109%2FTSE.2010.83">10.1109/TSE.2010.83</a>. <a href="S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:15449138">15449138</a>.</cite></span>

</li>

<li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><cite id="CITEREFLauWang2007" class="citation journal cs1">Lau, Kung-Kiu; Wang, Zheng (2007). "Software Component Models". <i>IEEE Transactions on Software Engineering</i>. <b>33</b> (10): <span class="nowrap">709–</span>724. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1109%2FTSE.2007.70726">10.1109/TSE.2007.70726</a>. <a href="ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/0098-5589">0098-5589</a>.</cite></span>

</li>

<li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><cite id="CITEREFMcIlroy1969" class="citation web cs1">McIlroy, Malcolm Douglas (January 1969). <a rel="nofollow" class="external text" href="http://homepages.cs.ncl.ac.uk/brian.randell/NATO/nato1968.PDF">"Mass produced software components"</a> <span class="cs1-format">(PDF)</span>. <i>Software Engineering: Report of a conference sponsored by the NATO Science Committee, Garmisch, Germany, 7-11 Oct. 1968</i>. Scientific Affairs Division, NATO. p. 79.</cite></span>

</li>

<li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><cite id="CITEREFRainer_Niekamp" class="citation web cs1">Rainer Niekamp. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20120328081234/http://congress.cimne.upc.es/cfsi/frontal/doc/ppt/11.pdf">"Software Component Architecture"</a> <span class="cs1-format">(PDF)</span>. Gestión de Congresos - CIMNE/Institute for Scientific Computing, TU Braunschweig. p. 4. Archived from <a rel="nofollow" class="external text" href="http://congress.cimne.upc.es/cfsi/frontal/doc/ppt/11.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2012-03-28<span class="reference-accessdate">. Retrieved <span class="nowrap">2011-07-29</span></span>. <q>The modern concept of a software component largely defined by Brad Cox of Stepstone, => Objective-C programming language</q></cite></span>

</li>

<li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><cite id="CITEREFBrad_Cox1991" class="citation book cs1"><a href="Brad_Cox" title="Brad Cox">Brad Cox</a> (1991). <i>Object Oriented Programming: An Evolutionary Approach</i>. Addison Wesley. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>0-201-54834-8</bdi>.</cite></span>

</li>

<li id="cite_note-claims-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-claims_9-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFRaphael_Gfeller2008" class="citation web cs1">Raphael Gfeller (December 9, 2008). <a rel="nofollow" class="external text" href="http://wiki.ita.hsr.ch/SemProgAnTr/files/Automated_upgrading_of_component.Präsentation.pptx">"Upgrading of component-based application"</a>. HSR - Hochschule für Technik Rapperswill. p. 4<span class="reference-accessdate">. Retrieved <span class="nowrap">2011-07-29</span></span>. <q>1990, IBM invents their System Object Model. 1990, as a reaction, Microsoft released OLE 1.0 OLE custom controls (OCX)</q></cite></span>

</li>

</ol></div></div></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2024-11-06" href="https://en.wikipedia.org/wiki/?title=Software_component&oldid=1255709827">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

</div>

</div></div>

</div>

</main>

</div>

</body></html>