(Migrated) external Java API access options from Zato services

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#1

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Hello!

I have to write a service that interfaces with a system that only provides
Java classes as an option.
Besides not using Zato, I thought about:

  1. Write Java Restful services and deploy on some Java Server (Tomcat
    probably), then my Zato services consume these rest services.
  2. Use py4j, that is minimalist compared to the previous option, and
    provides it’s own “ClientServer” socket-based protocol with collection
    conversion

I gave up on “jpype” as it starts JVM from Python and also introduces high
dependencies between then, and the other python packages that do the same.

Any suggestions/thoughts/critics are welcome!

Thanks and Best Regards,
Guilherme

#2

Hi Dariusz,

py4j has a multi threading and single threading models and looks nice, but
before going forward with it I would create a prototype with multiple
greenlets in parallel to see how it handle this. It is a standalone java
process so we don’t mess with JVM starts inside python, JNI, RMI, etc.

One other option I have just looked into is RestExpress (
https://github.com/RestExpress/RestExpress), that is a minimalist headless
Rest Server but to be honest maven is always a nightmare to me… But once
setup I guess it would be less surprise prone than py4j.

[]s!

On Tue, May 24, 2016 at 6:29 PM, Dariusz Suchojad dsuch@zato.io wrote:

On 24/05/16 22:53, Guilherme Monteiro wrote:

  1. Write Java Restful services and deploy on some Java Server (Tomcat
    probably), then my Zato services consume these rest services.
  2. Use py4j, that is minimalist compared to the previous option, and
    provides it’s own “ClientServer” socket-based protocol with collection
    conversion

Hi Guilherme,

py4j looks nice enough - but make sure you investigate first how its
threading model works. In particular, Zato is based on gevent down below
so there can be multiple greenlets running in parallel, I do not know
how py4j works in that regards.

Also, where does the server part of its protocol run? Is it a standalone
process or one that would be embedded in Zato?

Alternatively, I am sure there are some nice Spring libraries for REST
that you can easily deploy on Tomcat/Jetty, just like you said.

regards,

–
Dariusz Suchojad

https://zato.io
ESB, SOA, REST, APIs and Cloud Integrations in Python

#3

On 24/05/16 22:53, Guilherme Monteiro wrote:

  1. Write Java Restful services and deploy on some Java Server (Tomcat
    probably), then my Zato services consume these rest services.
  2. Use py4j, that is minimalist compared to the previous option, and
    provides it’s own “ClientServer” socket-based protocol with collection
    conversion

Hi Guilherme,

py4j looks nice enough - but make sure you investigate first how its
threading model works. In particular, Zato is based on gevent down below
so there can be multiple greenlets running in parallel, I do not know
how py4j works in that regards.

Also, where does the server part of its protocol run? Is it a standalone
process or one that would be embedded in Zato?

Alternatively, I am sure there are some nice Spring libraries for REST
that you can easily deploy on Tomcat/Jetty, just like you said.

regards,