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19 lines
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HTML
<!doctype html><html lang=en class="js csstransforms3d"><head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=generator content="Hugo 0.80.0"><meta name=description content="Strolch is a parameterized framework for use on servers and IoT"><meta name=author content="Strolch"><link rel=icon href=/favicon.ico type=image/ico><title>Architecture - Strolch</title><link href=/css/nucleus.css?1626091328 rel=stylesheet><link href=/css/fontawesome-all.min.css?1626091328 rel=stylesheet><link href=/css/hybrid.css?1626091328 rel=stylesheet><link href=/css/featherlight.min.css?1626091328 rel=stylesheet><link href=/css/perfect-scrollbar.min.css?1626091328 rel=stylesheet><link href=/css/auto-complete.css?1626091328 rel=stylesheet><link href=/css/atom-one-dark-reasonable.css?1626091328 rel=stylesheet><link href=/css/theme.css?1626091328 rel=stylesheet><link href=/css/hugo-theme.css?1626091328 rel=stylesheet><link href=/css/theme-green.css?1626091328 rel=stylesheet><script src=/js/jquery-3.3.1.min.js?1626091328></script><style>:root #header+#content>#left>#rlblock_left{display:none!important}</style></head><body data-url=/documentation/architecture/><nav id=sidebar><div id=header-wrapper><div id=header><a id=logo href=/><img src=/logo.png></a></div><div class=searchbox><label for=search-by><i class="fas fa-search"></i></label><input data-search-input id=search-by type=search placeholder=Search...>
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<span data-search-clear><i class="fas fa-times"></i></span></div><script type=text/javascript src=/js/lunr.min.js?1626091328></script><script type=text/javascript src=/js/auto-complete.js?1626091328></script><script type=text/javascript>var baseurl="https:\/\/strolch.li\/";</script><script type=text/javascript src=/js/search.js?1626091328></script></div><section id=homelinks><ul><li><a class=padding href=/><i class="fas fa-home"></i>Home</a></li></ul></section><div class=highlightable><ul class=topics><li data-nav-id=/api/ title=API class=dd-item><a href=/api/>API</a></li><li data-nav-id=/history/ title=History class=dd-item><a href=/history/>History</a></li><li data-nav-id=/documentation/ title=Documentation class="dd-item
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parent"><a href=/documentation/>Documentation</a><ul><li data-nav-id=/documentation/architecture/ title=Architecture class="dd-item active"><a href=/documentation/architecture/>Architecture</a></li><li data-nav-id=/documentation/model/ title=Model class=dd-item><a href=/documentation/model/>Model</a></li><li data-nav-id=/documentation/do-and-donts/ title="Do and Don't" class=dd-item><a href=/documentation/do-and-donts/>Do and Don't</a></li><li data-nav-id=/documentation/runtime-configuration/ title="Runtime Configuration" class=dd-item><a href=/documentation/runtime-configuration/>Runtime Configuration</a></li><li data-nav-id=/documentation/realms/ title=Realms class=dd-item><a href=/documentation/realms/>Realms</a></li><li data-nav-id=/documentation/components/ title=Components class=dd-item><a href=/documentation/components/>Components</a></li><li data-nav-id=/documentation/services-and-commands/ title="Services and Commands" class=dd-item><a href=/documentation/services-and-commands/>Services and Commands</a></li><li data-nav-id=/documentation/searches/ title=Searches class=dd-item><a href=/documentation/searches/>Searches</a></li><li data-nav-id=/documentation/queries/ title=Queries class=dd-item><a href=/documentation/queries/>Queries</a></li><li data-nav-id=/documentation/transactions/ title=Transactions class=dd-item><a href=/documentation/transactions/>Transactions</a></li><li data-nav-id=/documentation/policies/ title=Policies class=dd-item><a href=/documentation/policies/>Policies</a></li><li data-nav-id=/documentation/observers/ title=Observers class=dd-item><a href=/documentation/observers/>Observers</a></li><li data-nav-id=/documentation/versioning/ title=Versioning class=dd-item><a href=/documentation/versioning/>Versioning</a></li><li data-nav-id=/documentation/reports/ title=Reports class=dd-item><a href=/documentation/reports/>Reports</a></li><li data-nav-id=/documentation/priviles/ title=Privileges class=dd-item><a href=/documentation/priviles/>Privileges</a></li></ul></li><li data-nav-id=/plc/ title=PLC class=dd-item><a href=/plc/>PLC</a><ul><li data-nav-id=/plc/architecture/ title=Architecture class=dd-item><a href=/plc/architecture/>Architecture</a></li><li data-nav-id=/plc/example-set-up/ title="Example Set-Up" class=dd-item><a href=/plc/example-set-up/>Example Set-Up</a></li></ul></li><li data-nav-id=/tutorial/ title=Tutorial class=dd-item><a href=/tutorial/>Tutorial</a><ul><li data-nav-id=/tutorial/configuration/ title=Configuration class=dd-item><a href=/tutorial/configuration/>Configuration</a></li><li data-nav-id=/tutorial/model/ title=Model class=dd-item><a href=/tutorial/model/>Model</a></li><li data-nav-id=/tutorial/crud-book/ title="CRUD Book" class=dd-item><a href=/tutorial/crud-book/>CRUD Book</a></li></ul></li><li data-nav-id=/download/ title=Download class=dd-item><a href=/download/>Download</a></li><li data-nav-id=/development/ title=Development class=dd-item><a href=/development/>Development</a></li></ul><section id=shortcuts><h3>More</h3><ul><li><a class=padding href=https://strolch.li/tags><i class="fas fa-tags"></i>Tags</a></li><li><a class=padding href=https://github.com/strolch-li><i class="fab fa-github"></i>GitHub project</a></li></ul></section><section id=footer><p>Built with <a href=https://github.com/matcornic/hugo-theme-learn><i class="fas fa-heart"></i></a>from <a href=https://getgrav.org>Grav</a> and <a href=https://gohugo.io/>Hugo</a></p></section></div></nav><section id=body><div id=overlay></div><div class="padding highlightable"><div><div id=top-bar><div id=top-github-link><a class=github-link title="Edit this page" href=https://github.com/Pi4J/pi4j.github.io/tree/main/contentdocumentation/architecture.md target=blank><i class="fas fa-code-branch"></i><span id=top-github-link-text>Edit this page</span></a></div><div id=breadcrumbs itemscope itemtype=http://data-vocabulary.org/Breadcrumb><span id=sidebar-toggle-span><a href=# id=sidebar-toggle data-sidebar-toggle><i class="fas fa-bars"></i></a></span><span id=toc-menu><i class="fas fa-list-alt"></i></span><span class=links><a href=/>Strolch Overview</a> > <a href=/documentation/>Documentation</a> > Architecture</span></div><div class=progress><div class=wrapper><nav id=TableOfContents><ul><li><a href=#architecture>Architecture</a><ul><li><a href=#birds-view>Birds View</a></li><li><a href=#squirrel-view>Squirrel View</a></li></ul></li></ul></nav></div></div></div></div><div id=head-tags></div><div id=body-inner><h1>Architecture</h1><h2 id=architecture>Architecture</h2><h3 id=birds-view>Birds View</h3><p>A Strolch agent’s architecture can be seen as a simple three-tier architecture.
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The presentation layer is mostly a web frontend, where the communication with
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the agent is done via REST API calls.</p><p>The agent itself implements the business logic using Services, Commands,
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Queries etc.</p><p>The agent can communicate with other 3rd systems using any API, where it is
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preferred to use JSON over REST.</p><p>The agent can use a standard RDBMS as a storage system, where currently DAOs
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have been implemented only for PostgreSQL. Should it be required, then any
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JDBC cabable RDBMS can be used, as no PostgreSQL specific SQL commands are used.</p><p>The following diagram helps visualize this:</p><p><img src=/assets/images/Strolch-Bird-View.svg alt="Strolch Architecture Birds View"></p><h3 id=squirrel-view>Squirrel View</h3><p>The following diagram shows a more detailed view of the architecture of a
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Strolch Agent:</p><p><img src=/assets/images/Strolch-Squirrel-View.svg alt="Strolch Architecture Squirrel View"></p><p>A Strolch agent consists of the following main parts:</p><ul><li>REST Endpoints → expose an API to access the Strolch agent outside of the
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Java VM</li><li>Services and Commands → implements business logic</li><li>Searches → implements specific queries against the Strolch model</li><li>Components → Implements additional logic, which is best implement as a
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component. E.g. active components which have threads, etc.</li><li>Realms → implements multi-tenant capabilities</li></ul><p>In addition to the main parts, Strolch contains inherit capabilities, which
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gives Strolch unique features when compared to other Java Frameworks:</p><ul><li>Policies → Policies allow injecting different algorithms. All root elements
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can store Policy definitions, so that a service can delegate to a Policy and
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thus behave differently, depending on the element being accessed.</li><li>Transactions → Transactions handle locking/unlocking of objects, updating the
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model and are the central API for the developer.</li><li>Privileges → Strolch is user agnostic and any action, i.e. Service, Query,
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etc. is authorized against the authenticated user.</li><li>Observers → modifications to the model are propagated to listeners using the
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observer pattern.</li><li>Audits → Every access (read, modify) of the model are audited</li><li>Versioning → modifications to objects are versioned and thus can be rolled
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back at a later time.</li></ul><footer class=footline></footer></div></div><div id=navigation><a class="nav nav-prev" href=/documentation/ title=Documentation><i class="fa fa-chevron-left"></i></a><a class="nav nav-next" href=/documentation/model/ title=Model style=margin-right:0><i class="fa fa-chevron-right"></i></a></div></section><div style=left:-1000px;overflow:scroll;position:absolute;top:-1000px;border:none;box-sizing:content-box;height:200px;margin:0;padding:0;width:200px><div style=border:none;box-sizing:content-box;height:200px;margin:0;padding:0;width:200px></div></div><script src=/js/clipboard.min.js?1626091328></script><script src=/js/perfect-scrollbar.min.js?1626091328></script><script src=/js/perfect-scrollbar.jquery.min.js?1626091328></script><script src=/js/jquery.sticky.js?1626091328></script><script src=/js/featherlight.min.js?1626091328></script><script src=/js/highlight.pack.js?1626091328></script><script>hljs.initHighlightingOnLoad();</script><script src=/js/modernizr.custom-3.6.0.js?1626091328></script><script src=/js/learn.js?1626091328></script><script src=/js/hugo-learn.js?1626091328></script><script src=/mermaid/mermaid.js?1626091328></script><script>mermaid.initialize({startOnLoad:true});</script></body></html> |