Use @CacheResult when the method has no argument

Question

I have a method that returns the (rarely-changed) configuration of a system and want to cache it. The configuration is built from different pieces of data so I don't want to cache the individual pieces, but the SystemConfiguration object itself.

There is no argument to the method, how can I tell Ehcache to use a fixed key "configuration" (there's only one instance of the configuration)? Do I have to create a CacheKeyGenerator or is there a simpler method?

@CacheResult //how to specify the fixed key?
public SystemConfiguration getConfiguration() {
  return configuration; //this is a prebuilt object, as described
}

I created a CacheKeyGenerator in the meantime. A little bit extra code but it works. — wishihadabettername, May 07 '15 at 20:59

score 2 · Accepted Answer · answered May 11 '15 at 09:19

2

Spring caching has a default key generation algorithm that will cover the use case of methods with no arguments.

However, if you want a specific value for the key then you need to implement your own generator.

answered May 11 '15 at 09:19

Louis Jacomet

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This is what I had to do; the default SimpleKey.EMPTY was not appropriate as I have several such cases besides just the SystemConfiguration object. – wishihadabettername May 11 '15 at 13:26

Use @CacheResult when the method has no argument

1 Answers1