159 lines
6.4 KiB
HTML
159 lines
6.4 KiB
HTML
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<title>Strolch: Architecture</title>
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<li><a href="index.html">Overview</a></li>
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<li><a href="api.html">API</a></li>
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<div class="page-header">
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<h1 class="page-title">Documentation: Architecture</h1>
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<p class="lead page-description">This page discusses the architecture of a Strolch Agent</p>
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</div>
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<div class="content">
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<h2>Birds View</h2>
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<p>A Strolch agent's architecture can be seen as a simple three-tier architecture. The presentation layer is
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mostly a web frontend, where the communication with the agent is done via REST API calls.</p>
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<p>The agent itself implements the business logic using Services, Commands, Queries etc.</p>
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<p>The agent can communicate with other 3rd systems using any API, where it is preferred to use JSON over
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REST.</p>
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<p>The agent can use a standard RDBMS as a storage system, where currently DAOs have been implemented only for
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PostgreSQL. Should it be required, then any JDBC cabable RDBMS can be used, as no PostgreSQL specific SQL
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commands are used.</p>
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<p>The following diagram helps visualize this:</p>
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<img src="images/Strolch-Bird-View.svg" class="img-responsive center-block" alt="Strolch Agent Bird View">
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<br />
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<h2>Squirrel View</h2>
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<p>The following diagram shows a more detailed view of the architecture of a Strolch Agent.</p>
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<img src="images/Strolch-Squirrel-View.svg"
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class="img-responsive center-block"
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alt="Strolch Agent Squirrel View">
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<br />
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<p>A Strolch agent consists of the following main parts:</p>
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<ul>
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<li>REST Endpoints → expose an API to access the Strolch agent outside of the Java VM</li>
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<li>Services and Commands → implements business logic</li>
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<li>Searches → implements specific queries against the Strolch model</li>
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<li>Components → Implements additional logic, which is best implement as a component. E.g. active
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components which have threads, etc.
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</li>
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<li>Realms → implements multi-tenant capabilities</li>
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</ul>
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<p>In addition to the main parts, Strolch contains inherit capabilities, which gives Strolch unique features
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when compared to other Java Frameworks:</p>
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<ul>
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<li>Policies → Policies allow injecting different algorithms. All root elements can store Policy
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definitions, so that a service can delegate to a Policy and thus behave differently, depending on the
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element being accessed.
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</li>
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<li>Transactions → Transactions handle locking/unlocking of objects, updating the model and are the
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central API for the developer.
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</li>
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<li>Privileges → Strolch is user agnostic and any action, i.e. Service, Query, etc. is authorized
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against the authenticated user.
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</li>
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<li>Observers → modifications to the model are propagated to listeners using the observer pattern.</li>
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<li>Audits → Every access (read, modify) of the model are audited</li>
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<li>Versioning → modifications to objects are versioned and thus can be rolled back at a later time.
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</li>
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</ul>
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<p class="text-muted">© Strolch / <a href="mailto:eitch@eitchnet.ch">Robert von Burg</a> / Hosting by
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<a href="http://www.eitchnet.ch">eitchnet.ch</a></p>
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