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14.3.4.3. Catch the Result of a Method Invocation

A common practice for time or resource intensive operations is to save the results in a cache for future access. The following code is an example of such an operation: 
public String toCelsiusFormatted(float fahrenheit) {
	return
		NumberFormat.getInstance()
		.format((fahrenheit * 5 / 9) - 32)
		+ " degrees Celsius";
}
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A common approach is to cache the results of this method call and to check the cache when the result is next required. The following is an example of a code snippet that looks up the result of such an operation in a cache. If the results are not found, the code snippet runs the toCelsiusFormatted method again and stores the result in the cache. 
float f = getTemperatureInFahrenheit();
Cache<Float, String>
	fahrenheitToCelsiusCache = getCache();
String celsius =
	fahrenheitToCelsiusCache = get(f);
     if (celsius == null) {
	     celsius = toCelsiusFormatted(f);
	     fahrenheitToCelsiusCache.put(f, celsius);
     }
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In such cases, the Infinispan CDI module can be used to eliminate all the extra code in the related examples. Annotate the method with the @CacheResult annotation instead, as follows: 
@javax.cache.interceptor.CacheResult
public String toCelsiusFormatted(float fahrenheit) {
	return NumberFormat.getInstance()
	.format((fahrenheit * 5 / 9) - 32)
	+ " degrees Celsius";
}
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Due to the annotation, Infinispan checks the cache and if the results are not found, it invokes the toCelsiusFormatted() method call.

Note

The Infinispan CDI module allows checking the cache for saved results, but this approach should be carefully considered before application. If the results of the call should always be fresh data, or if the cache reading requires a remote network lookup or deserialization from a cache loader, checking the cache before call method invocation can be counter productive.
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