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61 lines
1.4 KiB
61 lines
1.4 KiB
package mightypork.utils.math.constraints.vect;
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import mightypork.gamecore.control.timing.Pollable;
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/**
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* <p>
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* Interface for constraints that support digests. Digest is a small data object
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* with final fields, typically primitive, used for procesing (such as rendering
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* or other very frequent operations).
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* </p>
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* <p>
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* Taking a digest is expensive, so if it needs to be done often and the value
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* changes are deterministic (such as, triggered by timing event or screen
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* resize), it's useful to cache the last digest and reuse it until such an
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* event occurs again.
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* </p>
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*
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* @author MightyPork
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* @param <D> digest class
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*/
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public interface Digestable<D> extends Pollable {
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/**
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* Take a digest. If digest caching is enabled and a digest is already
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* cached, it should be reused instead of making a new one.
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*
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* @return digest
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*/
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public D digest();
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/**
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* <p>
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* Toggle digest caching.
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* </p>
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* <p>
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* To trigger update of the cache, call the <code>poll()</code> method.
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* </p>
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*
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* @param yes
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*/
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void enableDigestCaching(boolean yes);
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/**
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* @return true if digest caching is enabled.
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*/
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boolean isDigestCachingEnabled();
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/**
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* If digest caching is enabled, query for a new digest and store it in a
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* cache variable. This method shall only be called when the constraint is
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* expected to have changed.
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*/
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@Override
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void poll();
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}
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