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GoogleAppEngineListener (Click Extras API - v2.3.0)
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org.apache.click.extras.gae</FONT>
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Class GoogleAppEngineListener</H2>
<PRE>
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.click.extras.gae.GoogleAppEngineListener</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/EventListener.html" title="class or interface in java.util">EventListener</A>, <A HREF="http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/ServletContextListener.html" title="class or interface in javax.servlet">ServletContextListener</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public class <B>GoogleAppEngineListener</B><DT>extends <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A><DT>implements <A HREF="http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/ServletContextListener.html" title="class or interface in javax.servlet">ServletContextListener</A></DL>
</PRE>
<P>
Provides <a href="http://code.google.com/appengine/docs/java/overview.html" class="external" target="_blank">Google App Engine</a>
(GAE) support for Click applications. GAE is a free Java hosting service
provided by Google that allows you to quickly and easily make your Click
applications available online.
<h3>Configuration</h3>
To deploy Click applications to GAE, you need to set the
<tt>GoogleAppEngineListener</tt> listener in your <tt>web.xml</tt>:
<pre class="codeHtml">
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;web-app xmlns="http://java.sun.com/xml/ns/javaee" version="2.5"&gt;
&lt;listener&gt;
&lt;listener-class&gt;<span class="red">org.apache.click.extras.gae.GoogleAppEngineListener</span>&lt;/listener-class&gt;
&lt;/listener&gt;
&lt;servlet&gt;
&lt;servlet-name&gt;ClickServlet&lt;/servlet-name&gt;
&lt;servlet-class&gt;org.apache.click.ClickServlet&lt;/servlet-class&gt;
&lt;load-on-startup&gt;0&lt;/load-on-startup&gt;
&lt;/servlet&gt;
&lt;servlet-mapping&gt;
&lt;servlet-name&gt;ClickServlet&lt;/servlet-name&gt;
&lt;url-pattern&gt;*.htm&lt;/url-pattern&gt;
&lt;/servlet-mapping&gt;
&lt;/web-app&gt; </pre>
You also need to configure GAE to exclude <tt>*.htm</tt> files from being
served as static resources. Also you should enable <tt>http-session</tt>
support. You set these changes in the GAE file <tt>war/WEB-INF/appengine-web.xml</tt>:
<pre class="codeHtml">
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;appengine-web-app xmlns="http://appengine.google.com/ns/1.0"&gt;
&lt;application>myapp&lt;/application&gt;
&lt;version&gt;1&lt;/version&gt;
&lt;!-- Configure java.util.logging --&gt;
&lt;system-properties&gt;
&lt;property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/&gt;
&lt;/system-properties&gt;
&lt;!-- Enable HttpSession usage --&gt;
&lt;<span class="blue">sessions-enabled</span>&gt;<span class="red">true</span>&lt;/<span class="blue">sessions-enabled</span>&gt;
&lt;!-- Exclude *.htm files from being served as static files by GAE,
because the *.htm extension is mapped to ClickServlet. --&gt;
&lt;static-files&gt;
&lt;<span class="blue">exclude</span> path="<span class="red">**.htm</span>" /&gt;
&lt;/static-files&gt;
&lt;/appengine-web-app&gt; </pre>
<h3>Performance Filter</h3>
If you use Click's <A HREF="../../../../../org/apache/click/extras/filter/PerformanceFilter.html" title="class in org.apache.click.extras.filter"><CODE>PerformanceFilter</CODE></A>
you should also exclude the following static files from GAE, so that
PerformanceFilter can set their <tt>expiry headers</tt>:
<tt>*.css</tt>, <tt>*.js</tt>, <tt>*.png</tt> and <tt>*.gif</tt>. For example:
<pre class="codeHtml">
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;appengine-web-app xmlns="http://appengine.google.com/ns/1.0"&gt;
...
&lt;!-- Exclude the following files from being served as static files by GAE,
as they will be processed by Click's PerformanceFilter. --&gt;
&lt;static-files&gt;
&lt;<span class="blue">exclude</span> path="<span class="red">**.htm</span>" /&gt;
&lt;<span class="blue">exclude</span> path="<span class="red">**.css</span>" /&gt;
&lt;<span class="blue">exclude</span> path="<span class="red">**.js</span>" /&gt;
&lt;<span class="blue">exclude</span> path="<span class="red">**.png</span>" /&gt;
&lt;<span class="blue">exclude</span> path="<span class="red">**.gif</span>" /&gt;
&lt;/static-files&gt;
&lt;/appengine-web-app&gt; </pre>
<h3>File Uploads</h3>
GAE does not allow web application to write to files on disk. This poses a
problem for the <A HREF="http://click.apache.org/docs/click-api/org/apache/click/control/FileField.html" title="class or interface in org.apache.click.control"><CODE>FileField</CODE></A> control that
depends on <a class="external" target="_blank" href="http://commons.apache.org/fileupload/">Commons FileUpload</a>
which stores uploaded files on disk. To work around this limitation Click
provides the <A HREF="../../../../../org/apache/click/extras/gae/MemoryFileUploadService.html" title="class in org.apache.click.extras.gae"><CODE>MemoryFileUploadService</CODE></A> which stores uploaded files in
memory.
<p/>
Below is an example configuration of a <A HREF="../../../../../org/apache/click/extras/gae/MemoryFileUploadService.html" title="class in org.apache.click.extras.gae"><CODE>MemoryFileUploadService</CODE></A>:
<pre class="prettyprint">
&lt;click-app charset="UTF-8"&gt;
&lt;pages package="com.myapp.pages"/&gt;
&lt;mode value="production"/&gt;
&lt;file-upload-service classname="org.apache.click.extras.gae.MemoryFileUploadService"&gt;
&lt;!-- Set the total request maximum size to 10mb (10 x 1024 x 1024 = 10485760).
The default request upload size is unlimited. --&gt;
&lt;property name="sizeMax" value="10485760"/&gt;
&lt;!-- Set the maximum individual file size to 2mb (2 x 1024 x 1024 = 2097152).
The default file upload size is unlimited. --&gt;
&lt;property name="fileSizeMax" value="2097152"/&gt;
&lt;/file-upload-service&gt;
&lt;/click-app&gt; </pre>
<h2>Limitations</h2>
<h3>Page Automapping</h3>
GAE does not always adhere to the Servlet specification. One of the areas that affects
Click directly is the <a href="../../../../../../user-guide/html/ch05s02.html#application-automapping">automatic mapping</a>
of Page templates to page classes. GAE does not implement the ServletContext
method <tt>getResourcePaths("/")</tt>. Instead of returning the resources under
the web-app root, it returns an empty set. Click needs these resources to map
between page templates and classes, and since GAE does not return anything,
it isn't possible to perform the automapping.
<p/>
Fortunately GAE does work properly for resources under subfolders of the web-app root.
For example if the folders <span class="blue">/path</span> or <span class="blue">/paths</span>
exists under the web-app root, calling <tt>getResourcePaths("/path")</tt> or
<tt>getResourcePaths("/paths")</tt> will return the set of resources contained
under these folders.
<p/>
Taking advantage of the fact that GAE supports subfolders, Click
provides automapping support to GAE applications with a slight caveat: Page
templates <b>must</b> be placed under the folders <span class="blue">/path</span>
or <span class="blue">/paths</span> of the web-app root. Click explicitly
maps these two folders if it is running on GAE, other subfolders are not supported.
<p/>
<b>Please note:</b> manual mapping works as expected.
<p/>
Below is an automapping example for the folder <span class="blue">/page</span>
(note the page template <tt>index.htm</tt> is not placed under the folder
<tt>/page</tt>, and has to be mapped manually):
<pre class="codeConfig">
/index.htm
<span class="blue">/page</span>/search.htm
<span class="blue">/page</span>/customer/customer-edit.htm
<span class="blue">/page</span>/customer/customer-search.htm </pre>
The Page classes are placed under the <span class="blue">page</span> package:
<pre class="codeConfig">
com.mycorp<span class="blue">.page</span>.IndexPage.java
com.mycorp<span class="blue">.page</span>.SearchPage.java
com.mycorp<span class="blue">.page</span>.customer.CustomerEditPage.java
com.mycorp<span class="blue">.page</span>.customer.CustomerSearchPage.java </pre>
Lastly define the <tt>click.xml</tt> to automatically map page templates
and classes under the package <tt>com.mycorp</tt>:
<pre class="prettyprint">
&lt;click-app&gt;
&lt;pages package="com.mycorp"&gt;
&lt;page path="/index.htm" classname="page.IndexPage"/&gt;
&lt;/pages&gt;
&lt;mode value="production"/&gt;
&lt;/click-app&gt; </pre>
<b>Please note:</b> automapping will work in a GAE <tt>development</tt> environment
but not when hosted on the server. GAE uses the Jetty server for local development
which properly implements <tt>getResourcePaths("/")</tt>.
<p/>
<b>Also note:</b> when running Click on GAE in development mode, it will appear
that automapping is working when it really isn't. This is because
Click uses a variety of ways to detect new page templates in development mode.
So even though automapping failed, Click still serves page requests because it
used an alternative way of looking up the template template. While these techniques
are useful for development modes it impacts performance and is not used
in production mode.
<h3>Deployment limitation</h3>
On application startup, Click automatically deploys all its JavaScript, CSS
and image resources to the "<tt>/click</tt>" folder in the root directory of
the webapp. Since GAE doesn't allow writing to disk, Click cannot
automatically deploy its resources.
<p/>
Please see the user-guide section,
<a href="../../../../../../user-guide/html/ch05s03.html#deploying-restricted-env">Deploying resources in a restricted environment</a>,
for various solutions.
<P>
<P>
<HR>
<P>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<TD><CODE><B><A HREF="../../../../../org/apache/click/extras/gae/GoogleAppEngineListener.html#GoogleAppEngineListener()">GoogleAppEngineListener</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Creates a default GoogleAppEngineListener.</TD>
</TR>
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&nbsp;
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/click/extras/gae/GoogleAppEngineListener.html#contextDestroyed(javax.servlet.ServletContextEvent)">contextDestroyed</A></B>(<A HREF="http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/ServletContextEvent.html" title="class or interface in javax.servlet">ServletContextEvent</A>&nbsp;servletContextEvent)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This method does nothing.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/click/extras/gae/GoogleAppEngineListener.html#contextInitialized(javax.servlet.ServletContextEvent)">contextInitialized</A></B>(<A HREF="http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/ServletContextEvent.html" title="class or interface in javax.servlet">ServletContextEvent</A>&nbsp;servletContextEvent)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sets the Ognl Runtime SecurityManager to <tt>null</tt> so as not to
interfere with Google App Engine (GAE).</TD>
</TR>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></B></TH>
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<TD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
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<A NAME="GoogleAppEngineListener()"><!-- --></A><H3>
GoogleAppEngineListener</H3>
<PRE>
public <B>GoogleAppEngineListener</B>()</PRE>
<DL>
<DD>Creates a default GoogleAppEngineListener.
<P>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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<A NAME="contextDestroyed(javax.servlet.ServletContextEvent)"><!-- --></A><H3>
contextDestroyed</H3>
<PRE>
public void <B>contextDestroyed</B>(<A HREF="http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/ServletContextEvent.html" title="class or interface in javax.servlet">ServletContextEvent</A>&nbsp;servletContextEvent)</PRE>
<DL>
<DD>This method does nothing.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/ServletContextListener.html#contextDestroyed(javax.servlet.ServletContextEvent)" title="class or interface in javax.servlet">contextDestroyed</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/ServletContextListener.html" title="class or interface in javax.servlet">ServletContextListener</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>servletContextEvent</CODE> - the event class for notifications about
changes to the servlet context</DL>
</DD>
</DL>
<HR>
<A NAME="contextInitialized(javax.servlet.ServletContextEvent)"><!-- --></A><H3>
contextInitialized</H3>
<PRE>
public void <B>contextInitialized</B>(<A HREF="http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/ServletContextEvent.html" title="class or interface in javax.servlet">ServletContextEvent</A>&nbsp;servletContextEvent)</PRE>
<DL>
<DD>Sets the Ognl Runtime SecurityManager to <tt>null</tt> so as not to
interfere with Google App Engine (GAE). GAE provides its own strict
SecurityManager which clashes with Ognl security checks.
<pre class="prettyprint">
OgnlRuntime.setSecurityManager(null); </pre>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/ServletContextListener.html#contextInitialized(javax.servlet.ServletContextEvent)" title="class or interface in javax.servlet">contextInitialized</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/ServletContextListener.html" title="class or interface in javax.servlet">ServletContextListener</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>servletContextEvent</CODE> - the event class for notifications about
changes to the servlet context</DL>
</DD>
</DL>
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