In addition to the supplied Java filters, Tungsten Replicator also includes support for custom script-based filters written in JavaScript and supported through the JavaScript filter. This filter provides a JavaScript environment that exposes the transaction information as it is processed internally through an object-based JavaScript API.
The JavaScript implementation is provided through the Rhino open-source implementation. Rhino provides a direct interface between the underlying Java classes used to implement the replicator code and a full JavaScript environment. This enables scripts to be developed that have access to the replicator constructs and data structures, and allows information to be updated, reformatted, combined, extracted and reconstructed.
At the simplest level, this allows for operations such as database renames and filtering. More complex solutions allow for modification of the individual data, such as removing nulls, bad dates, and duplication of information.
If you previously implemented custom filters with older releases of
Tungsten Replicator or with the now deprecated Open Source (OSS) release,
you would have edited the static-SERVICE.properties
file.
This is no longer a supported method of implementing custom filters, and doing so will break automated upgrades through tpm.
To enable custom filters, follow the process here: Section 10.6.2, “Installing Custom JavaScript Filters”