Package org.apache.tapestry5.func
Interface LazyFunction<T>
public interface LazyFunction<T>
A lazy function is used to populate a
Flow
incrementally. Lazy functions allow calculations to be
deferred. They also support infinitely large Flows, where successive values are computed just as needed.- Since:
- 5.2.0
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Method Summary
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Method Details
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next
Calculates the next value for the function. The return value is tricky: it combines the next value in theFlow
with a function to compute the value after that as aLazyContinuation
. Alternately, a LazyFunction can return null to indicate that it has returned all the values it can.- Returns:
- continuation containing next value and next function, or null when no more values can be produced
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