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14.3.4.3.4. Generate a Custom Key

Generate a custom key as follows: 
import javax.cache.annotation.CacheKey;
import javax.cache.annotation.CacheKeyGenerator;
import javax.cache.annotation.CacheKeyInvocationContext;
import java.lang.annotation.Annotation;

public class MyCacheKeyGenerator implements CacheKeyGenerator {

   @Override
   public CacheKey generateCacheKey(CacheKeyInvocationContext<? extends Annotation> ctx) {

      return new MyCacheKey(
            ctx.getAllParameters()[0].getValue()
      );
   }
}
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The listed method constructs a custom key. This key is passed as part of the value generated by the first parameter of the invocation context.
To specify the custom key generation scheme, add the optional parameter cacheKeyGenerator to the @CacheResult annotation as follows: 
@CacheResult(cacheKeyGenerator = MyCacheKeyGenerator.class)
public void doSomething(String p1, String p2) {
...
}
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Using the provided method, p1 contains the custom key.
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