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From Paul Carter-Brown <paul.carter-br...@jini.guru>
Subject Re: Initiating httpservletrequest from inside Tomcat / TomEE
Date Mon, 06 May 2019 15:18:26 GMT
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 <jcdwrrc@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-brown@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 <jcdwrrc@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-brown@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 <jcdwrrc@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-brown@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
> >> >> >
> >> >>
> >> >
> >>
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> >>
> >>
> >
>
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