tJavaStorm – Docs for ESB 5.x

Component family

Custom Code

Function

tJavaStorm allows you to enter
the custom Storm code you want to use in the Storm topology you are
designing. You can execute this code only once.

This component appears only when you are creating a Storm Job.

Purpose

tJavaStorm makes it possible to
extend the functionalities of a Talend Job through writing custom execute method of the bolt to be used.
A bolt is the worker that accomplishes any processing in a
topology.

Basic settings

Schema and Edit
Schema

A schema is a row description. It defines the number of fields to be processed and passed on
to the next component. The schema is either Built-In or
stored remotely in the Repository.

Built-In: You create and store the schema locally for this
component only. Related topic: see Talend Studio
User Guide.

Repository: You have already created the schema and
stored it in the Repository. You can reuse it in various projects and Job designs. Related
topic: see Talend Studio User Guide.

Click Edit schema to make changes to the schema. If the
current schema is of the Repository type, three options are
available:

Bolt code

Enter the body of the main method of the bolt you want to
execute.

Advanced settings

Bolt advanced code

This area allows you to define the classes, variables and methods
that you want to use along with the execute method of the bolt defined in the Basic settings view. Note that the
advanced code is not required for using tJavaStorm.

Two fields are available for this purpose:

Implement the prepare code:
select this check box and in the displayed field, define the
prepare method to set up the
environment in which the bolt is executed.

Implement the cleanup method:
select this check box and in the displayed field, define the
cleanup method you want to
use to finalize a topology.

Usage

Once a Storm Job is opened in the workspace, tJavaStorm appears in the Palette of the Studio. It is used as an intermediate
step in a Storm Job.

Note that in this documentation, unless otherwise explicitly stated, a scenario presents
only Standard Jobs, that is to say traditional Talend data
integration Jobs.

Storm Connection

You need to use the Storm Configuration tab in the
Run view to define the connection to a given Storm
system for the whole Job.

This connection is effective on a per-Job basis.