| <!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta http-equiv=x-ua-compatible content="ie=edge"><meta name=lang:clipboard.copy content="Copy to clipboard"><meta name=lang:clipboard.copied content="Copied to clipboard"><meta name=lang:search.language content=en><meta name=lang:search.pipeline.stopwords content=True><meta name=lang:search.pipeline.trimmer content=True><meta name=lang:search.result.none content="No matching documents"><meta name=lang:search.result.one content="1 matching document"><meta name=lang:search.result.other content="# matching documents"><meta name=lang:search.tokenizer content=[\s\-]+><link rel="shortcut icon" href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.0.4, mkdocs-material-4.4.2"><title>Architecture - Eclipse Hawk</title><link rel=stylesheet href=../../assets/stylesheets/application.30686662.css><link rel=stylesheet href=../../assets/stylesheets/application-palette.a8b3c06d.css><meta name=theme-color content=#7e57c2><script src=../../assets/javascripts/modernizr.74668098.js></script><link href=https://fonts.gstatic.com rel=preconnect crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,400,400i,700|Roboto+Mono&display=fallback"><style>body,input{font-family:"Roboto","Helvetica Neue",Helvetica,Arial,sans-serif}code,kbd,pre{font-family:"Roboto Mono","Courier New",Courier,monospace}</style><link rel=stylesheet href=../../assets/fonts/material-icons.css><link rel=stylesheet href=../../stylesheets/extra.css><!-- FAVICON --><link rel=apple-touch-icon sizes=180x180 href=/img/apple-touch-icon.png><link rel=icon type=image/png sizes=32x32 href=/img/favicon-32x32.png><link rel=icon type=image/png sizes=16x16 href=/img/favicon-16x16.png><link rel=manifest href=/img/site.webmanifest><link rel=mask-icon href=/img/safari-pinned-tab.svg color=#5bbad5><link rel="shortcut icon" href=/img/favicon.ico><meta name=msapplication-TileColor content=#b91d47><meta name=msapplication-config content=/img/browserconfig.xml><meta name=theme-color content=#ffffff></head> <body dir=ltr data-md-color-primary=deep-purple data-md-color-accent=deep-purple> <svg class=md-svg> <defs> </defs> </svg> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay data-md-component=overlay for=__drawer></label> <header class=md-header data-md-component=header> <nav class="md-header-nav md-grid"> <div class=md-flex> <div class="md-flex__cell md-flex__cell--shrink"> <a href=../.. title="Eclipse Hawk" class="md-header-nav__button md-logo"> <img src=../../img/hawk-logo-white.svg width=24 height=24> </a> </div> <div class="md-flex__cell md-flex__cell--shrink"> <label class="md-icon md-icon--menu md-header-nav__button" for=__drawer></label> </div> <div class="md-flex__cell md-flex__cell--stretch"> <div class="md-flex__ellipsis md-header-nav__title" data-md-component=title> <span class=md-header-nav__topic> Eclipse Hawk </span> <span class=md-header-nav__topic> Architecture </span> </div> </div> <div class="md-flex__cell md-flex__cell--shrink"> <label class="md-icon md-icon--search md-header-nav__button" for=__search></label> <div class=md-search data-md-component=search role=dialog> <label class=md-search__overlay for=__search></label> <div class=md-search__inner role=search> <form class=md-search__form name=search> <input type=text class=md-search__input name=query placeholder=Search autocapitalize=off autocorrect=off autocomplete=off spellcheck=false data-md-component=query data-md-state=active> <label class="md-icon md-search__icon" for=__search></label> <button type=reset class="md-icon md-search__icon" data-md-component=reset tabindex=-1>  </button> </form> <div class=md-search__output> <div class=md-search__scrollwrap data-md-scrollfix> <div class=md-search-result data-md-component=result> <div class=md-search-result__meta> Type to start searching </div> <ol class=md-search-result__list></ol> </div> </div> </div> </div> </div> </div> <div class="md-flex__cell md-flex__cell--shrink"> <div class=md-header-nav__source> <a href=https://git.eclipse.org/c/hawk/hawk.git/ title="Go to repository" class=md-source data-md-source> <div class=md-source__repository> Git repository @ Eclipse </div> </a> </div> </div> </div> </nav> </header> <div class=md-container> <main class=md-main role=main> <div class="md-main__inner md-grid" data-md-component=container> <div class="md-sidebar md-sidebar--primary" data-md-component=navigation> <div class=md-sidebar__scrollwrap> <div class=md-sidebar__inner> <nav class="md-nav md-nav--primary" data-md-level=0> <label class="md-nav__title md-nav__title--site" for=__drawer> <a href=../.. title="Eclipse Hawk" class="md-nav__button md-logo"> <img src=../../img/hawk-logo-white.svg width=48 height=48> </a> Eclipse Hawk </label> <div class=md-nav__source> <a href=https://git.eclipse.org/c/hawk/hawk.git/ title="Go to repository" class=md-source data-md-source> <div class=md-source__repository> Git repository @ Eclipse </div> </a> </div> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../.. title=Home class=md-nav__link> Home </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-toggle md-nav__toggle" data-md-toggle=nav-2 type=checkbox id=nav-2> <label class=md-nav__link for=nav-2> Basic use </label> <nav class=md-nav data-md-component=collapsible data-md-level=1> <label class=md-nav__title for=nav-2> Basic use </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../basic-use/installation/ title=Installation class=md-nav__link> Installation </a> </li> <li class=md-nav__item> <a href=../../basic-use/core-concepts/ title="Core concepts" class=md-nav__link> Core concepts </a> </li> <li class=md-nav__item> <a href=../../basic-use/examples-xmi/ title="Examples (XMI)" class=md-nav__link> Examples (XMI) </a> </li> <li class=md-nav__item> <a href=../../basic-use/examples-modelio/ title="Examples (Modelio)" class=md-nav__link> Examples (Modelio) </a> </li> <li class=md-nav__item> <a href=../../basic-use/papyrus/ title="Papyrus UML support" class=md-nav__link> Papyrus UML support </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-toggle md-nav__toggle" data-md-toggle=nav-3 type=checkbox id=nav-3> <label class=md-nav__link for=nav-3> Advanced use </label> <nav class=md-nav data-md-component=collapsible data-md-level=1> <label class=md-nav__title for=nav-3> Advanced use </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../advanced-use/graph-as-emf/ title="Graph as EMF model" class=md-nav__link> Graph as EMF model </a> </li> <li class=md-nav__item> <a href=../../advanced-use/advanced-props/ title="Advanced properties" class=md-nav__link> Advanced properties </a> </li> <li class=md-nav__item> <a href=../../advanced-use/meta-queries/ title="Meta-level queries" class=md-nav__link> Meta-level queries </a> </li> <li class=md-nav__item> <a href=../../advanced-use/temporal-queries/ title="Temporal queries" class=md-nav__link> Temporal queries </a> </li> <li class=md-nav__item> <a href=../../advanced-use/oomph/ title="Oomph and Hawk" class=md-nav__link> Oomph and Hawk </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--active md-nav__item--nested"> <input class="md-toggle md-nav__toggle" data-md-toggle=nav-4 type=checkbox id=nav-4 checked> <label class=md-nav__link for=nav-4> Server </label> <nav class=md-nav data-md-component=collapsible data-md-level=1> <label class=md-nav__title for=nav-4> Server </label> <ul class=md-nav__list data-md-scrollfix> <li class="md-nav__item md-nav__item--active"> <input class="md-toggle md-nav__toggle" data-md-toggle=toc type=checkbox id=__toc> <a href=./ title=Architecture class="md-nav__link md-nav__link--active"> Architecture </a> </li> <li class=md-nav__item> <a href=../api/ title="Thrift API" class=md-nav__link> Thrift API </a> </li> <li class=md-nav__item> <a href=../api-security/ title="Thrift API security" class=md-nav__link> Thrift API security </a> </li> <li class=md-nav__item> <a href=../deployment/ title=Deployment class=md-nav__link> Deployment </a> </li> <li class=md-nav__item> <a href=../cli/ title="Console client" class=md-nav__link> Console client </a> </li> <li class=md-nav__item> <a href=../eclipse/ title="Eclipse client" class=md-nav__link> Eclipse client </a> </li> <li class=md-nav__item> <a href=../file-config/ title="File-based configuration" class=md-nav__link> File-based configuration </a> </li> <li class=md-nav__item> <a href=../logging/ title=Logging class=md-nav__link> Logging </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-toggle md-nav__toggle" data-md-toggle=nav-5 type=checkbox id=nav-5> <label class=md-nav__link for=nav-5> Developers </label> <nav class=md-nav data-md-component=collapsible data-md-level=1> <label class=md-nav__title for=nav-5> Developers </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../developers/run-from-source/ title="Run GUI from source" class=md-nav__link> Run GUI from source </a> </li> <li class=md-nav__item> <a href=../../developers/server-from-source/ title="Run Server from source" class=md-nav__link> Run Server from source </a> </li> <li class=md-nav__item> <a href=../../developers/plain-maven/ title="Build with plain Maven" class=md-nav__link> Build with plain Maven </a> </li> <li class=md-nav__item> <a href=../../developers/website/ title="Work on the website" class=md-nav__link> Work on the website </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../../additional-resources/ title="Additional resources" class=md-nav__link> Additional resources </a> </li> <li class=md-nav__item> <a href=https://www.eclipse.org/forums/index.php/f/442/ title=Forum class=md-nav__link> Forum </a> </li> <li class=md-nav__item> <a href=https://ci.eclipse.org/hawk/ title=Builds class=md-nav__link> Builds </a> </li> </ul> </nav> </div> </div> </div> <div class=md-content> <article class="md-content__inner md-typeset"> <h1>Architecture</h1> <p>If an entire team is querying the same set of models, indexing them from a central location is more efficient than maintaining multiple indexes. In other cases, we may want to query models from outside Eclipse and even from applications written in other languages (e.g. C++ or Python).</p> <p>To support these use cases, Hawk includes a server that exposes its functionality through a set of Thrift APIs. This server product is a headless Eclipse application that can be run from the command line. The general structure is as shown here:</p> <p><img alt="Hawk server deployment" src=../img/platform_deployment.png></p> <p>The server component is implemented as an Eclipse application, based on the Eclipse Equinox OSGi runtime. Using Eclipse Equinox for the server allows for integrating the Eclipse-based tools with very few changes in their code, while reducing the chances of mutual interference. The OSGi class loading mechanisms ensure that each plugin only "sees" the classes that it declares as dependencies, avoiding common clashes such as requiring different versions of the same Java library or overriding a configuration file with an unexpected copy from another library.</p> <p>To mitigate the risk of connectivity problems due to enterprise firewalls, the server uses for most of the API the standard HTTP and HTTPS protocols (by default, on the unprivileged ports 8080 and 8443) and <a href=../api-security/ >secures</a> them through <a href=https://shiro.apache.org/ >Apache Shiro</a>. Optionally, the Hawk API can be exposed through raw TCP on port 2080, for increased performance: however, security-conscious environments should leave it disabled as it does not support authentication. The embedded <a href=https://activemq.apache.org/artemis/ >Apache Artemis</a> messaging queue required for remote change notifications in Hawk requires its own port, as it manages its own network connections. By default, this is port 61616. These notifications are made available through two protocols: Artemis Core (a lightweight replacement for the Java Message Service, for Java clients) and STOMP over WebSockets (a cross-language messaging protocol, for web-based clients).</p> <p>The server includes plugins that use the standard OSGi HttpService facilities to register servlets and filters. Each service is implemented as one or more of these servlets. The currently implemented endpoints are these:</p> <table> <thead> <tr> <th>Path within server</th> <th>Service</th> <th>Thrift protocol</th> </tr> </thead> <tbody> <tr> <td>/thrift/hawk/binary</td> <td>Hawk</td> <td>Binary</td> </tr> <tr> <td>/thrift/hawk/compact</td> <td>Hawk</td> <td>Compact</td> </tr> <tr> <td>/thrift/hawk/json</td> <td>Hawk</td> <td>JSON</td> </tr> <tr> <td>/thrift/hawk/tuple</td> <td>Hawk</td> <td>Tuple</td> </tr> <tr> <td>/thrift/users</td> <td>Users</td> <td>JSON</td> </tr> </tbody> </table> <p>All services provide a JSON endpoint, since it is compatible across all languages supported by Thrift and works well with web-based clients. However, since Hawk is performance sensitive (as we might need to encode a large number of model elements in the results of a query), it also provides endpoints with the other Thrift protocols. Binary is the most portable after JSON, and Tuple is the most efficient but is only usable from Java clients. Having all four protocols allows Hawk clients to pick the most efficient protocol that is available for their language.</p> <p>The available operations for the Users and Hawk APIs are listed in <a href=../api/ >Thrift API</a>. For details about the optional access control to these APIs, check <a href=../api-security/ >Thrift API security</a>.</p> </article> </div> </div> </main> <footer class=md-footer> <div class=md-footer-nav> <nav class="md-footer-nav__inner md-grid"> <a href=../../advanced-use/oomph/ title="Oomph and Hawk" class="md-flex md-footer-nav__link md-footer-nav__link--prev" rel=prev> <div class="md-flex__cell md-flex__cell--shrink"> <i class="md-icon md-icon--arrow-back md-footer-nav__button"></i> </div> <div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title"> <span class=md-flex__ellipsis> <span class=md-footer-nav__direction> Previous </span> Oomph and Hawk </span> </div> </a> <a href=../api/ title="Thrift API" class="md-flex md-footer-nav__link md-footer-nav__link--next" rel=next> <div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title"> <span class=md-flex__ellipsis> <span class=md-footer-nav__direction> Next </span> Thrift API </span> </div> <div class="md-flex__cell md-flex__cell--shrink"> <i class="md-icon md-icon--arrow-forward md-footer-nav__button"></i> </div> </a> </nav> </div> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-footer-copyright> <div class=md-footer-copyright__highlight> Copyright © Eclipse Foundation, Inc. All Rights Reserved. </div> powered by <a href=https://www.mkdocs.org>MkDocs</a> and <a href=https://squidfunk.github.io/mkdocs-material/ > Material for MkDocs</a> </div> <div class="md-footer-copyright hawk-eclipse-links"> <ul> <li><a href=https://www.eclipse.org/legal/privacy.php>Privacy Policy</a></li> <li><a href=https://www.eclipse.org/legal/termsofuse.php>Terms of Use</a></li> <li><a href=https://www.eclipse.org/legal/copyright.php>Copyright Agent</a></li> </ul> </div> </div> </div> </footer> </div> <script src=../../assets/javascripts/application.c648116f.js></script> <script>app.initialize({version:"1.0.4",url:{base:"../.."}})</script> </body> </html> |