10.6. JavaScript Filters

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.

Warning

If you previously implemented custome filters with older releases of Tungsten Replicator or with the now deprecated, Open Source release, you would have edited the static-SERVICE.properties file.

This is no longer a suppored 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”