For reference, I did find this after searching "calling a servlet programmatically": https://docs.oracle.com/cd/E19146-01/819-2634/abxbn/index.html
On 5/6/19, Paul Carter-Brown <paul.carter-br...@jini.guru> wrote: > I think we are completely missing each other. Forget sockets - that was > just an example. I have code running in a Tomcat App server which is not > managed by Tomcat and is not initiated by anything within Tomcat. That code > now wants to call a servlet hosted in that very same JVM. Any way to do > that without going out and back in on TCP? > > > On Mon, May 6, 2019 at 5:14 PM John Dale <jcdw...@gmail.com> wrote: > >> Sockets are an implementation of TCP/UDP inherently. >> >> Perhaps a mountaintop signal fire? >> >> ;) >> >> John >> >> >> On 5/6/19, Paul Carter-Brown <paul.carter-br...@jini.guru> wrote: >> > lol on the Semaphore Telegraph, >> > >> > I can't use a request dispatcher as the request is being initiated from >> > code that has no context. I already have it working with HTTP using >> > asynchttp library, but I want to avoid the overhead. E.g. lets say I >> wrote >> > my own server socket listener on port 10000 running in the Tomcat JVM >> > and >> > got some request in some propriatary protocol called X. Now I want to >> call >> > a Tomcat servlet in the current JVM with some info I got over X without >> > going out on TCP and back in.... >> > >> > On Mon, May 6, 2019 at 4:40 PM John Dale <jcdw...@gmail.com> wrote: >> > >> >> If you're wanting to forward control to another servlet deployed in >> >> the same context: >> >> https://www.javatpoint.com/requestdispatcher-in-servlet >> >> >> >> If you are okay going through TCP to facilitate some future or current >> >> distribution of services, Use HTTPURLConnection (not sure what you're >> >> wanting to do with the result of the request, if anything): >> >> >> >> >> https://stackoverflow.com/questions/2793150/how-to-use-java-net-urlconnection-to-fire-and-handle-http-requests >> >> >> >> If you need more sophisticated HTTP interactions, Apache maintains a >> >> very useful library for that: http://hc.apache.org/ >> >> >> >> If these don't work-out for you, rather than using .NET, PHP, Python, >> >> or some other Java facsimile at best, I recommend using the semaphore >> >> telegraph: >> >> https://en.wikipedia.org/wiki/Semaphore_telegraph >> >> >> >> Sincerely, >> >> >> >> John >> >> DB2DOM >> >> >> >> On 5/6/19, Paul Carter-Brown <paul.carter-br...@jini.guru> wrote: >> >> > Hi John, >> >> > >> >> > Thanks for your feedback. >> >> > >> >> > The request I'm initiating should not or need not carry any context >> >> > from >> >> > the originating code. There is also no session to worry about as its >> >> > just >> >> > for rest calls. So basically I have the headers, path and body and >> need >> >> to >> >> > generate a http servlet request and get an http servlet response (or >> >> > similar) back. I have this working by calling into localhost but >> >> > ideally >> >> > want to skip the trombone out and back in. >> >> > >> >> > Have you got any basic code examples? >> >> > >> >> > Paul >> >> > >> >> > On Tue, Apr 30, 2019 at 5:27 PM John Dale <jcdw...@gmail.com> wrote: >> >> > >> >> >> Another thought .. you can do some request dispatching, but without >> >> >> knowing more about the tools you're using, I can't say for sure if >> >> >> this is the direction you'll want to go. >> >> >> >> >> >> On 4/29/19, Paul Carter-Brown <paul.carter-br...@jini.guru> wrote: >> >> >> > Hi >> >> >> > >> >> >> > I'm trying to design a Kafka consumer and producer that will run >> >> inside >> >> >> the >> >> >> > tomcat jvm and pick up messages off a Kafka topic and translate >> them >> >> >> into a >> >> >> > servlet request and pass it through tomcat and then when the >> >> >> > response >> >> >> > is >> >> >> > complete then translate it into a Kafka message and put it onto >> >> another >> >> >> > topic as a reply. This way I can reuse our existing jax-rs rest >> >> >> > services >> >> >> > and expose them as an async api over Kafka. The idea is to make >> >> >> > the >> >> >> > Kafka >> >> >> > messages similar to http in that they would consist of headers >> >> >> > and >> a >> >> >> body. >> >> >> > The body would be json. >> >> >> > >> >> >> > Now I know this could be done by calling localhost with an http >> call >> >> to >> >> >> > trombone the requests back into tomcat but I'd like to avoid the >> >> >> associated >> >> >> > latency and overhead. Is it possible to call tomcat directly >> >> >> > in-process. >> >> >> > This does not need to be portable to other containers so can be >> >> >> > proprietary. >> >> >> > >> >> >> > I'm using tomcat 8. In fact its tomee 8 but guessed this is more >> >> >> > a >> >> >> > tomcat >> >> >> > question than tomee but have sent to both groups just in case. >> >> >> > >> >> >> > Thanks for any insights. >> >> >> > >> >> >> > Paul >> >> >> > >> >> >> >> >> > >> >> >> >> --------------------------------------------------------------------- >> >> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >> >> For additional commands, e-mail: users-h...@tomcat.apache.org >> >> >> >> >> > >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >> For additional commands, e-mail: users-h...@tomcat.apache.org >> >> > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
