There are several ways to extend the features of Talend including custom code components like tJava, tGroovy, and tJavaFlex which allow executing arbitrary Java or Groovy code. User defined functions allow creating separate Java classes with reusable static methods. Custom components can also be created as new components that appear in the palette for tasks like supporting new data sources or custom processing. Custom components provide reusability and visibility as they have a unique icon and purpose.

1. Extending Talend Features

2. Extending options...
● Custom Code components
● User defined function
● Custom components

3. ●Custom Code components
● tJava
● tJavaRow
● tGroovy
● tGroovyFile
● tJavaFlex

4. tJava
● Executes arbitrary Java code
● Can use external libraries
● Useful for small non-repeating tasks
● No re-usability
● No visibility, unlike other components ex.
MySQL input is for reading data from MySQL
with defined schema.

5. tJavaRow
All of tJava, plus, fit into data flow rows in ETL
process

6. tJavaFlex
All of tJavaRow, plus, provides initialization and
finalization blocks to organized code.

7. tGroovy
Same as tJava, executed arbitrary Groovy
code.
tGroovyFile reads the script from a file.

8. User Defined Routines
● Separate Java classes with static methods in
Talend project
● Suitable for small repeating tasks
● Little visibility based on class and method name
● Generally used from tMap or other code editor,
code components or inside other components.
Ex. Extract file name from string to feed into
tFileDelimetedInput.

9. Custom Components
● New components like built-ins in pallate.
● Suitable for tasks like support for extract/load
to/from new data source. Ex. Elasticsearch
● Or, custom processing, Ex pivot rows or convert
rows to nested JSON Mustache template
● Provides visibility, as a component has unique
icon to identify in ETL flow and its purpose is
understood.

10. Custom Components contd.
● Its reusable, as it will appear in pallate like
other built-in components and,
● It can be shared with other developer elegantly.
– Through Talend Forge
– Can export with Talend project and other user
import it with project
– Install it on TAC