[Tapestry Wiki] Update of "SendingHtmlEmailWithTap" by SamGendler

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The following page has been changed by SamGendler:
http://wiki.apache.org/tapestry/SendingHtmlEmailWithTap

New page:
= HTML Email =

If you would like to use a Tapestry page to render an html email, you can use the following procedures, which were most recently posted to the tapestry-users mailing list by Dave Kallstrom.  These are directly copied from his emails.

For Tapestry 4.0.x

{{{
BaseHTMLMessagePage sendPage = (BaseHTMLMessagePage) getHtmlPage(inner);
ByteArrayOutputStream out = new ByteArrayOutputStream();
IMarkupWriter writer = new MarkupWriterImpl("text/html", new
PrintWriter(out), new AsciiMarkupFilter());
inner.activate(sendPage);
inner.renderPage(writer);
writer.flush();
subjectAndBody[0] = sendPage.getSubject();
subjectAndBody[1] = out.toString();
inner.cleanup();
getRequestGlobals(cycle).store(cycle);
}}}

I also have the following method in my bookmarks, but I don't have an attribution.  Could be the same user, but I'm not at all sure. 

{{{
// page is the page with the email template 
  IPage prevPage = cycle.getPage(); 
  page.setProperty("user", user); 
  page.setProperty("url", url); 
  ByteArrayOutputStream out = new ByteArrayOutputStream(); 
  IMarkupWriter writer = page.getResponseWriter(out); 
  cycle.activate(page); 
  cycle.renderPage(writer); 
  writer.flush(); 
  String body = out.toString(); 
  cycle.activate(prevPage); 
}}}

I'm not so sure about activating a different page in the cycle and then reactivating the original, though.  I suspect the upper method is more correct.

However, these methods no longer worked in 4.1, s when Dave Kallstrom figured out a new methodology, he posted it to the list:

{{{
       ResponseBuilder defaultBuilder =
           getRequestGlobals(cycle).getResponseBuilder();
       IEngine engine = cycle.getEngine();
       RequestCycleFactory factory = getRequestCycleFactory(cycle);

       IRequestCycle inner = factory.newRequestCycle(engine);
       String[] subjectAndBody = new String[2];
       BaseHTMLMessagePage sendPage = 
           (BaseHTMLMessagePage) getHtmlPage(inner);

       ByteArrayOutputStream out = new ByteArrayOutputStream();
       IMarkupWriter writer = 
           new MarkupWriterImpl("text/html", 
                                new PrintWriter(out), 
                                new AsciiMarkupFilter());
       ResponseBuilder builder = 
           new EmailResponseBuilder(writer,
                                    engine.getInfrastructure().getAssetFactory(), 
                                    false, 
                                    cycle);

       getRequestGlobals(cycle).store(builder);

       inner.activate(sendPage);
       inner.renderPage(builder);
       writer.flush();
       subjectAndBody[0] = sendPage.getSubject();
       subjectAndBody[1] = out.toString();
       inner.cleanup();
}}}

He added the following comment, too.

{{{
Notice the storing of the EmailResponseBuilder in requestGlobals and then
replacing it with the original DefaultResponseBuilder.
I'm not sure if all of this was necessary but it's the only way I could get
it to work. I will investigate using hivemind to wire up the
EmailResponseBuilder and also the HtmlEmailPage. But for now this is how I
got it to work.
}}}

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