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thenComposeAsync (Future method)
Last update:
May 18, 2026
Flattens a Future-of-Future: when this Future succeeds, your function returns another Future, and the chain follows that inner Future.
Description
Use thenComposeAsync when the next step is itself asynchronous. The callback runs on the async executor and must return a Future. The outer Future completes with whatever the inner Future produces.
Returns
A new Future.
Category
Asynchronous programming
Function syntax
future.thenComposeAsync(function)Parameters
| Parameter | Description |
|---|---|
| function | Required. A function that takes the previous result and returns a Future. |
See also
thenCompose
Example
Nested async step (from product tests).
<cfscript>
future = runAsync(function() {
return 5; }).thenComposeAsync(function(x)
{ return runAsync(function() { return x * 2; }); }).thenApplyAsync(function(x) { return x + 10; });
writeOutput(future.get()); // 20
</cfscript>
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