Snippet

Fine-grained Cache Keys with Custom KeyGenerator

Default Spring Caching uses a SimpleKeyGenerator which might lead to collisions in complex environments. Implementing a custom KeyGenerator provides full control over how keys are hashed, enabling developers to include class metadata or specific parameter attributes to ensure cache isolation and efficiency.

snippet.java

java

@Component("myKeyGenerator")
public class CustomCacheKeyGenerator implements KeyGenerator {
    @Override
    public Object generate(Object target, Method method, Object... params) {
        return target.getClass().getSimpleName() + "_" 
             + method.getName() + "_" 
             + Arrays.deepHashCode(params);
    }
}

spring

Breakdown

public Object generate(Object target, Method method, Object... params)

Custom logic to derive a unique identifier for a specific method execution.

Arrays.deepHashCode(params)

Generates a stable hash code based on the deep contents of the method arguments.

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Fine-grained Cache Keys with Custom KeyGenerator

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