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thenCompose
Last update:
May 18, 2026
After this Future completes normally, runs a function on the completing thread that returns another Future, and flattens the result.
Description
thenCompose is an instance method on a CFML Future. When the prior stage completes successfully, your function runs on the completing thread. The function must return another Future. The returned stage from thenCompose completes when that inner Future completes, so callers do not need nested get() calls.
This is the synchronous counterpart to thenComposeAsync. Prefer thenComposeAsync when the inner work should run on the async executor.
Returns
A new Future (flattened composition).
Category
Asynchronous programming
Function syntax
future.thenCompose(function)Parameters
| Parameter | Description |
|---|---|
| function | Required. A function that accepts this stage’s result and returns a Future. |
Example
Chain a second async task without nesting futures manually.
<cfscript>
future = runAsync(function() { return 5; });
composed = future.thenCompose(function(x) {
return runAsync(function() { return x * 10; });
});
writeOutput(composed.get()); // 50
</cfscript>
See also
thenApply
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