Eric, This is pretty interesting. Several years I wrote a similar taglib that showed localized messages in jsps using the language set in the session. I used java.util.ResourceBundle and worried about performance, but ResourceBundle provides a way to cache the (key,message) pairs so performance was not an issue.
Anyway, I am pretty much curious about that Property Factory and if it is not confidential could you please show it? Regards Ivan --- "Ferrer, Eric" <[EMAIL PROTECTED]> wrote: > Ivan, > > I have a Properties Factory where I plan to add the > contents of the > manifest. Its ruffed up code to prove it can be > done using the > previously mention ant tasks. The tld will invoke > the read once and > then add it to the Factory. > > -----Original Message----- > From: Ivan Ivanov > [mailto:[EMAIL PROTECTED] > Sent: Wednesday, December 28, 2005 6:00 PM > To: Ant Users List > Subject: RE: using buildnumber effectively > > Hello Eric, > > this is fine. However, don't you think that it might > slow down your web app, since every page you hit > should retrieve the version from the manifest file > again? > > Regards > Ivan > > --- "Ferrer, Eric" <[EMAIL PROTECTED]> > wrote: > > > Ivan, > > > > I quickly created this tag provided bellow and it > > reads the manifest > > file. I do deploy to numerous webapps and the > > deployment directory > > differs between tomcat and websphere, I omitted > > where I handle that > > difference. > > > > Using the ant tasks, my manifest looks like this > > > > Manifest-Version: 1.0 > > Ant-Version: Apache Ant 1.6.5 > > Created-By: 1.4.2_06-b03 (Sun Microsystems Inc.) > > Author: admin > > Bundle-Name: DemoApp > > Bundle-Vendor: ABC Inc > > Bundle-Build: 20051123-bp1608 > > Bundle-Version: 20051123-bp1608.019 > > Bundle-Date: December 28 2005 > > > > My jsp calls <l:manifest > > attributeName="Bundle-Build"/> to retrieve the > > build and <l:manifest attributeName=" Bundle-Date > > "/> to retrieve the > > date. > > > > Still needs more work, but it works. > > > > public class ManifestReaderTag extends TagSupport > { > > > > private String _attributeName; > > > > > > /** > > * > > */ > > public ManifestReaderTag() { > > super(); > > } > > > > > > /** > > * @return Returns the _attributeName. > > */ > > public String getAttributeName() { > > return _attributeName; > > } > > /** > > * @param name The _attributeName to set. > > */ > > public void setAttributeName(String name) { > > _attributeName = name; > > } > > > > public int doStartTag() throws JspException { > > > > readManifest(); > > return SKIP_BODY; > > } > > > > > > > > /** > > * @see javax.servlet.jsp.tagext.Tag#doEndTag() > > */ > > public int doEndTag() throws JspException { > > > > > > return super.doEndTag(); > > } > > > > private void readManifest() { > > /* read our manifest and display values */ > > JarFile jarFile = null; > > Attributes jarAttribs = null; > > if(getAttributeName() != null) { > > try{ > > > > Package thePackage = > > getClass().getPackage(); > > String theClass = > > "/"+thePackage.getName().replace('.','/') + > > "/ManifestReaderTag.class"; > > URL turl = > getClass().getResource(theClass); > > > > > > if(turl != null) { > > > > String pathToThisClass = > turl.toString(); > > > > /* appserver differences exists > > code omitted > > */ > > > > String manifestPath = pathToThisClass + > > "/META-INF/MANIFEST.MF"; > > > > //check if jar:file: present (shows up in > > eclipse) > > int pos = > > manifestPath.indexOf("jar:file:/"); > > if(pos > -1) > > manifestPath = > > manifestPath.substring(pos+10, > > manifestPath.length()); > > File theFile = new File(manifestPath); > > > > if(theFile != null) { > > FileInputStream fis = new > > FileInputStream(theFile); > > > > //Manifest manifest = new Manifest(new > > URL(manifestPath).openStream()); > > Manifest manifest = new Manifest(fis); > > > > if(manifest != null) { > > jarAttribs = > > manifest.getMainAttributes(); > > > > if(jarAttribs !=null) { > > > > if(jarAttribs.containsKey(getAttributeName())) > > > > > pageContext.getOut().write(jarAttribs.getValue(getAttributeName())); > > else > > > > pageContext.getOut().write("Missing Attribute in > > Manifest.MF"); > > } > > > > fis.close(); > > } > > } > > > > > > } > > }catch (IOException ioe) { > > System.err.println("Error reading > manifest > > file for > > properties lookup : " + ioe.toString()); > > } finally { > > if(jarFile != null) > > try{ > > jarFile.close(); > > } catch(java.io.IOException ioe) { > > //nothing to do > > } > > } > > } > > } > > } > > > > > > -----Original Message----- > > From: Ivan Ivanov > > [mailto:[EMAIL PROTECTED] > > Sent: Wednesday, December 28, 2005 4:57 PM > > To: Ant Users List > > Subject: Re: using buildnumber effectively > > > > Hello Eric, > > > > Using Alexey's code (I was going to provide > similar > === message truncated === __________________________________ Yahoo! for Good - Make a difference this year. http://brand.yahoo.com/cybergivingweek2005/ --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
