Custom Key Generator Spring Cache
@FunctionalInterface public interface KeyGenerator Cache key generator. Used for creating a key based on the given method (used as context) and its parameters. (Object target, Method method, Object. Params) Generate a key for the given method and its parameters.
In the last example we saw how to use a custom KeyGenerator by using CacheConfig#keyGenerator. In this example, we will see how to register our custom KeyGenerator globally by implementing CachingConfigurer interface or by extending its adapter class CachingConfigurerSupport.
Example
Java Config
CachingConfigurer interface is to be implemented by @Configuration classes annotated with @EnableCaching. It provides various methods to configure or customize caching abstraction.
We are also overriding cacheManager() method to register our cache provider.
The Custom KeyGenerator
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- Jun 29, 2017 Spring Boot cache with. Spring.cache.type=redis spring.redis.host=192. @CacheConfig — Class level annotation allows to specify global values for annotations like cache name or key generator.
A service bean
As compare to the last example, we don't need to use @CacheConfig#keyGenerator or @Cacheable#keyGenerator anymore.
The main class
Example Project
Dependencies and Technologies Used:
- spring-context 5.0.4.RELEASE: Spring Context.
- JDK 1.8
- Maven 3.3.9
Spring Cache is nothing but a store of key-value pairs, where values are the ones returned from @Cacheable methods, whereas, for keys there has to be some strategy to generate them. By default Spring uses a simple key generation based on the following algorithm:
If @Cacheable method has no arguments then SimpleKey.EMPTY is used as key.
If only one argument is used, then the argument instance is used as key.
If more than one argument is used, then an instance of
SimpleKeycomposed of all arguments is used as key.
Note that to avoid key collisions, SimpleKey class overrides hashCode() and equals() methods and compares all parameters of the target method as shown in the following snippets:
Custom Key Generator Spring Caches
Example
In this example, we will understand the default key generation. We will also understand why we may need custom keys in some cases and how to generate them.
Java Config
ConcurrentMapCacheManager is another Spring provided CacheManager implementation that lazily builds ConcurrentMapCache instances for each request.
A service bean
To understand default cache generation (as stated above), we are going to create a no arg, one arg and multiple args @Cacheable methods:
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The main class
As seen in above native cache output, the key generation is according the rules we stated in the beginning of this tutorial.
Generating custom keys
What will happen if we create multiple @Cacheable methods having same argument types? Let's see that by creating two no-args methods:
As seen in above output, Spring attempts to retrieved the same cache value of department list (String[]) for the second method. That's because both methods map to the same key value of SimpleKey.EMPTY. To fix this issue we can define a custom key for the second method. @Cacheable method has an element key for that purpose:
@Cacheable#key allows to use Spring Expression Language (SpEL) for computing the key dynamically. Check out this list to understand what expression metadata can be used.
In above example #root.methodName refers to the method which is being invoked.
Let's run ExampleMain2 again:
Also check out this to understand more scenarios where defining custom key generation is desirable.
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Example Project
Dependencies and Technologies Used:
Spring Cache Custom Key Generator Example
- spring-context 5.0.4.RELEASE: Spring Context.
- JDK 1.8
- Maven 3.3.9