Custom Transformers and FME Flow

Question

Are there any special considerations when dealing with custom transformers and FME Flow (formerly FME Server)? Full Guide: FME Flow Troubleshooting Guide

Answer

There are two types of custom transformers:

• Embedded custom transformers are those whose definition is contained within a workspace. The custom transformer can be used within that workspace, but nowhere else. Embedded transformers are coloured green within the workspace.
• Linked custom transformers are those whose definition is contained within a separate .fmx file. Such a file enables the transformer to be used in multiple workspaces; for example by emailing them to other FME users, or by placing them in a shared directory. Linked transformers are coloured cyan within the workspace.

Q: If I upload a workspace to FME Flow which contains an embedded transformer is that transformer available to the workspace on Flow?
A: Yes. If the custom transformer is an embedded transformer, it is self-contained within the workspace - all you need to do is publish the workspace to FME Flow and it will work.

Q: How do I upload my linked transformers up to FME Flow?
A: Visit this step-by-step guide for full instructions.

Q: What happens if there are two definitions of the same custom transformer, one in the repository directory the other in the shared directory?
A: FME Flow will always try to find the transformer in the in FME_SHARED_RESOURCE_DIR first. If this is not there, then it will look for the transformer defined in the repository resource directory.