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| </head> |
| <body class="article"> |
| <div id="header"> |
| </div> |
| <div id="content"> |
| <div class="sect1"> |
| <h2 id="using-snaps">Using Virgo Snaps in your application</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Every snap or host should also be a regular WAB (Web Application |
| Bundle), all you have to do is add some additional configuration to |
| benefit from VS.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="using-snaps-configuring-the-host">Configuring the Host</h3> |
| <div class="paragraph"> |
| <p>In the WAB that is to act as a host to Snaps bundles, all that needs to |
| be added is a filter in the host’s <code>web.xml</code>. This filter can be |
| mapped to any sub path that you want forwarded to registered snaps. It |
| is important to note the extra <code>dispatcher</code> declarations in the |
| <code>filter-mapping</code>. Without these internal lookups, resources like JSPs |
| won’t get passed to the appropriate snap when needed.</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre><filter> |
| <filter-name>host-filter-name</filter-name> |
| <filter-class>org.eclipse.virgo.snaps.core.SnapHostFilter</filter-class> |
| </filter> |
| |
| <filter-mapping> |
| <filter-name>host-filter-name</filter-name> |
| <url-pattern>/*</url-pattern> |
| <dispatcher>INCLUDE</dispatcher> |
| <dispatcher>FORWARD</dispatcher> |
| <dispatcher>REQUEST</dispatcher> |
| </filter-mapping></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="using-snaps-configuring-a-snap">Configuring a Snap</h3> |
| <div class="paragraph"> |
| <p>A snap is a normal WAB with the addition of two extra manifest headers. |
| The <code>Snap-Host</code> is used to resolve the WAB you want to act as a |
| host for this snap. The <code>Snap-ContextPath</code> gives the path the |
| snap will answer to. In order to reach the snap a request must be made |
| for the host’s context path, plus any path in the host’s Snaps filter |
| followed by the path given with the <code>Snap-ContextPath</code> header.</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>Snap-Host: org.eclipse.virgo.snaps.sample.animal;version="${version:[=.=.=, =.+1)}" |
| Snap-ContextPath: /dog</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>For attaching a snap to multiple hosts, the <code>Snap-Host</code> allows the specification of |
| multiple host bundles. Given the example above, the Dog snap could be additionally |
| attached to the <code>Snap-Host</code> <code>org.eclipse.virgo.snaps.sample.zoo</code> as follows:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>Snap-Host: org.eclipse.virgo.snaps.sample.animal,org.eclipse.virgo.snaps.sample.zoo |
| Snap-ContextPath: /dog</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Even though a snap can be attached to multiple hosts, the <code>Snap-ContextPath</code> will |
| remain the same, which means that regardless of the <code>Snap-Host</code>, the snap |
| will be located under the same path. Multiple <code>Snap-Host</code> definitions might |
| be useful for snaps that hold resources required in multiple applications (for instance |
| third party libraries or functionality that can be reused across applications).</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="using-snaps-taglibs">Using the Snaps taglibs</h3> |
| <div class="paragraph"> |
| <p>There is a tag library available that makes information about the Snaps |
| environment available to the host from within a JSP page. The prefix and |
| URI to declare are |
| <code><%@ taglib prefix="snaps" uri="http://www.eclipse.org/virgo/snaps" |
| %></code>. You can now access an array of all the Snaps currently |
| registered with the host. Each snap in the array has two values, the |
| first is the context path the Snap is registered with, as given in the |
| snaps manifest header. The second is an array of properties, if any, |
| given in a property file in the snap. The file must be in the <code>META-INF</code> |
| directory and have a name of <code>snap.properties</code>. The following code snippet |
| shows all of these in use to produce links to each of the installed snaps.</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre><snaps:snaps var="snaps"> |
| <c:forEach var="snap" items="${snaps}"> |
| <a href="<c:url value="${snap.contextPath}${snap.properties['link.path']}"/>"> |
| ${snap.properties['link.text']}</a> |
| </c:forEach> |
| </snaps:snaps></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The first line uses the Snaps tag library to place the array of snaps |
| into the <code>snaps</code> variable. Then a <code>forEach</code> loop goes through each snap. |
| The content of the <code>forEach</code> loop is the really interesting bit. The |
| first variable <code>${snap.contextPath}</code> returns the context path of the |
| snap. The two lookups are for properties |
| <code>${snap.properties['something']}</code>. They rely on the snap having the |
| properties file in place with <code>link.path</code> and <code>link.text</code> defined in it. |
| This shows the flexibility you have for defining your own contract |
| between the host and its snaps. In this case each snap can contribute |
| extra information about how links in a menu should be constructed.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="using-snaps-host-prefix">Referencing Resources</h3> |
| <div class="paragraph"> |
| <p>If the snap needs to lookup any resources, this can be done in the |
| normal way and if the resource cannot be found in the snap, then the |
| host will be checked. Remember that a host and all its snaps use a |
| single <code>ServletContext</code>. As the snap is always checked first it can hide |
| resources at the same path in its host. So if you want to look up a |
| resource in the snaps host that exists in the snap simply prefix the |
| path with <code>host:</code>. This will then cause the Snaps system to bypass the |
| snap and look only in its host for the requested resource. If it is not |
| found in its host the snap will NOT be checked, the lookup will return |
| with nothing.</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>request.getServletContext().getResource("host:/WEB-INF/sample.properties");</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>This line of Java code gets the ServletContext from the HttpRequest |
| object and then tries to get a resource from the host, bypassing the |
| snap.</p> |
| </div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div id="footer"> |
| <div id="footer-text"> |
| Last updated 2017-02-13 20:56:38 +01:00 |
| </div> |
| </div> |
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| </html> |
