To Loop or Not to Loop: Overcoming Roadblocks with FME

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To Loop or Not to Loop:
Overcoming Roadblocks with FME

Meet the Presenters
Laura Wu Mark Ireland Sienna Emery Trent Kading

Agenda
● What is Looping?
● Loop a Set Number of Times
● Loop Until a Condition is Met
● Loop Through a List of Features
●...

What are Loops?
● In Computer Programming, a loop allows for repeating the same
set of code over and over again until a ta...

Types of Loops
There are two primary types of loops:
For Loops
● Repeat a process a set number of
times
● A specific numbe...

Looping in FME
● True looping is handled within Custom Transformers using Transformer Loops
● These allow you to send feat...

Loop a Set Number of Times
Example: Perform a set of tasks once for each record in a CSV file
When writing code, you would...

Loop # of times
Demo #1

Loop a Set Number of Times
Example: Generate 1000 random points within a set area
You could use a Loop for this, but using...

Loop # of Times
The Goal
I want to randomly
add points to park
polygons to
represent the
number of trees
inside each
The O...

Loop # of Times
The Goal
I want to randomly
add points to park
polygons to
represent the
number of trees
inside each
The O...

Loop through a list
Demo #2

Loop Through a List
Loop i times, where i is the number of elements in a list.
The ListElementCounter defines i. The ListI...

List-Loop Requirements
You have a list of variable length (else you could hard-code the index numbers)
You wish to carry o...

Avoiding Loops with a List
Building a list then
exploding it!
Using built-in
FME transformers.

Looping until a list is exhausted
The Goal
I’d like to sum up
the parking fines
for each block of
each street. Values
are ...

Q&A

Loop until a condition occurs
Demo #3

Looping until a condition occurs
This type of looping relies on a test to
determine whether or not the loop should
end.
Th...

Looping until a condition occurs
● Inside a loop a Tester can be
used to test conditions
● If the condition passes, then
f...

Restarting the loop
● Inside the custom transformer
you can right click and Insert
Transformer Loop
● To loop to a diﬀeren...

Pagination
If an API is returning many results, the results are often broken down into pages so
the responses from the API...

Pagination Variables
Just like this page on FME Hub, HTTP calls often let you select the number of results per
page and ho...

Looping until a condition occurs
The Goal
I’d like to pull data
from all FME Server
jobs around a
certain date
The Obstacl...

Spatial Group-by Looping
Demo #4

Geometry Group-by Looping
Custom Transformer as an FMX file:
Why?
1) You need to perform some iterative
analysis that does...

Geometry Group-by Looping Scenario
Problem: Finding the neighborhood restaurants based on a buﬀer distance from Community ...

Group-by looping with geometry
The Goal
To find the
closest restaurant
from community
centres based on
neighborhood.
The O...

Summary
● FME is not naturally a looping tool.
● It's not bad to use looping, but often non-looping solution is quicker
an...

Real-World Examples
These are items in the FME Hub that make use of loops:
● FeatureShuﬀler
● ListBreaker
● InclusiveSampl...

Not-So-Real-World Example
The Puzzle of Santa’s Faulty Warehouse
Challenge #8 in the Twelve Days of FME (2020).
A malfunct...

Resources
Custom Transformers Looping
Looping with Blocking Transformers
Desktop Advanced Course- Looping
Become a data in...

Thank you!
Stay in the loop about all things FME at
safe.com/community
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