- Original Message -
From: Darryl Pentz [EMAIL PROTECTED]
To: Tomcat Users List users@tomcat.apache.org
Sent: Monday, September 15, 2008 10:37 AM
Subject: Interapp Communications
Some time back I needed to communicate between two apps running in the
same Tomcat instance. I decided on using a simple HTTP call with Apache
Commons HttpClient. For some reason use of this class is causing PermGen
errors (I should add that I use a dynamic language in the mix, which might
impact that in some way) so I want to abandon that approach anyway,
because it just doesn't 'feel right' :-).
So I was wondering, is JMS the way to go with something like this? I see
Tomcat is able to use JMS via a JNDI read-only lookup.
Many thanks,
Darryl Pentz
Well, the way you doing it is also good for cross machine, cross domain
you using simple SOAP... Axis your way...
That HTTPd client is quite heavy, maybe Java's URL Connection will do what
you need
I dont bother too much with the stuff out there... JMS is a way, but you
looking for JNDI registries now.
Not sure if TC built in JNDI... targeting tomcat... will be enuf?
Some very rough code for you to play with... Java really makes http very
very easy
private byte[] loadURLFileBytes(String urlPlusFile) {
byte[] data = new byte[0];
try {
URL url = new URL(urlPlusFile);
URLConnection connection = url.openConnection();
connection.setDoInput(true);//GET
connection.setUseCaches(false); // get fresh from server
InputStream in = connection.getInputStream();
BufferedInputStream bis = new BufferedInputStream(in);
int length = connection.getContentLength();
int len;
byte[] buffer = new byte[512];
while ((len = bis.read(buffer)) != -1) {
data = appendBlock(data,buffer,len);
}
in.close();
bis.close();
} catch(Exception ex) {
//JOptionPane.showMessageDialog(null, ex.getMessage() , Error
during data download, JOptionPane.WARNING_MESSAGE);
return null;
}
return data;
}
That all your HTTP is doing for you...
Then Tomcat can do cross contexts as well... theres a cross context flag to
set and some code that looks like this..
The post also describes the issue...
http://forums.java.net/jive/thread.jspa?messageID=215873
One day when your site is huge, you making millions... maybe your cross
machine way will sound good again ;)
Theres SOA/EJB as well... ;)
Have fun...
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