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| <a name="Case Study: JSP vs. Velocity"><strong>Case Study: JSP vs. Velocity</strong></a> |
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| <blockquote> |
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| <td bgcolor="#ffffff"><pre> |
| I just wanted to share my findings on Velocity. I use velocity as an |
| embedded mail templating system in our application server. |
| |
| When I began this subproject, I was using JSP as the language for |
| generating template output for our application server. It was |
| horrible. There were many problems, not to mention the difficulty of |
| embedding a servlet engine in the app server that I could |
| communicate with through direct method calls instead of over a |
| socket. Specific to the Velocity argument was the JSP template |
| versus the VTL template. I'd like to show you what my JSP template |
| looked like. Package names have been changed to protect the |
| innocent. Here is an example: |
| |
| ----------------8<--------------- |
| |
| <%@ page session="false" |
| import="java.util.*, |
| foo.events.*, |
| foo.emeeting.*, |
| foo.validation.*, |
| foo.util.actionevent.ActionEvent, |
| java.util.Date"%> |
| |
| <jsp:useBean id="meeting" scope="request" type="foo.IMeeting" |
| class="foo.Meeting"/> |
| |
| <html> |
| |
| <!-- etc --> |
| |
| <table width="600" border="0" cellspacing="0" cellpadding="4" |
| bgcolor="white"> |
| <tr> |
| <td> |
| <% |
| Iterator events = meeting.getStoredEventsIterator(); |
| int repId = 0; |
| |
| %> |
| <i><b>Topic: <%= meeting.getTopic()%></b></i> |
| <p> |
| <% |
| while (events.hasNext()) { |
| Object event = events.next(); |
| Participation yapper = |
| meeting.getParticipation(((MeetingEvent)event).getFromId()); |
| if(event instanceof ChatEvent) { |
| if("R".equals(yapper.getRole()) ) { |
| %> |
| <font color="#000000"><b><%=yapper.getName()%>:</b></font> |
| <% |
| repId = yapper.getParticipantId(); |
| } else { |
| %> |
| <font color="#0000f0"><b><%=yapper.getName()%>:</b></font> |
| <% |
| } |
| ChatEvent ce = (ChatEvent) event; |
| %> |
| <br> |
| <% |
| } else if(event instanceof URLPushedEvent) { |
| if("R".equals(yapper.getRole()) ) { |
| %> |
| <font color="#000000"><b><%=yapper.getName()%>:</b></font> |
| <% |
| } else { |
| %> |
| <font color="#0000f0"><b><%=yapper.getName()%>:</b></font> |
| <% |
| } |
| URLPushedEvent pe = (URLPushedEvent) event; |
| %> |
| <a href="<%=pe.getStoredData()%>">"<%=pe.getStoredData()%>"</a> <br> |
| <% |
| } |
| } |
| %> |
| <hr> |
| <br><%=meeting.getMeetingId()%>:<%=repId%><br> |
| </td> |
| </tr> |
| </table> |
| </div> |
| </body> |
| </html> |
| |
| ----------------8<--------------- |
| |
| Seasick yet? Now here is the Velocity template accomplishing the |
| same thing as above: |
| |
| ----------------8<--------------- |
| |
| <html> |
| |
| <!-- etc --> |
| |
| <table width="600" border="0" cellspacing="0" cellpadding="4" |
| bgcolor="white"> |
| <tr> |
| <td> |
| <i><b>Topic: $meeting.getTopic()</b></i><p> |
| |
| #foreach( $event in $meeting.getStoredEventsIterator() ) |
| #set( $yapper = $meeting.getParticipation($event.getFromId()) ) |
| #if( $event.getClass().getName().equals($urlEvent) ) |
| #if( $repRole.equals($yapper.getRole()) ) |
| #set( $repId = $yapper.getParticipantId() ) |
| <font color="$blk"><b>$yapper.getName()</b></font> |
| #else |
| <font color="$blu"><b>$yapper.getName()</b></font> |
| #end |
| <a href="$event.getStoredData()">$event.getStoredData()</a> <br> |
| #elseif( $event.getClass().getName().equals($chatEvent) ) |
| #if($repRole.equals($yapper.getRole()) ) |
| #set( $repId = $yapper.getParticipantId() ) |
| <font color="$blk"><b>$yapper.getName()</b></font> |
| #else |
| <font color="$blu"><b>$yapper.getName()</b></font> |
| #end |
| $event.getStoredData() <br> |
| #end |
| #end |
| <hr> |
| <br>$meeting.getMeetingId():$repId<br> |
| </td> |
| </tr> |
| </table> |
| </div> |
| </body> |
| </html> |
| |
| ----------------8<--------------- |
| |
| I was subsequently able to define that largish foreach loop into a |
| macro and shrink it even more, using Velocity's #macro function, so |
| I could do this: |
| |
| #drawStandardHtmlTranscript ( $meeting ) |
| |
| removing 20 lines of code from each template whilst only adding 2 |
| lines (one for #parse and the other for the |
| #drawStandardHtmlTranscript. |
| |
| The call to the Velocity runtime to finally merge the template |
| consumes about 20-50 milleseconds (on a 400 mHz PII Linux system) |
| when I pool the contexts (time doubles when I do not). This is great |
| performance, too! |
| |
| Last but not least, teaching the web design team to write a template |
| took literally 10 minutes from start to finish. They haven't asked |
| me a single question since. |
| |
| -- |
| Nick Bauman |
| Software Engineer |
| 3600 Dupont |
| Minneapolis, MN |
| 55412 |
| Mobile Phone: (612) 810-7406 |
| Home Phone: (612) 522-0165 |
| </pre></td> |
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| <td bgcolor="#023264" height="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td> |
| <td bgcolor="#023264" width="1" height="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td> |
| </tr> |
| </table> |
| </div> |
| </blockquote> |
| </p> |
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