Snippet

Declarative Method Caching with @Cacheable

Caching improves performance by storing the result of expensive operations. When @Cacheable is used, Spring checks the cache first; if the data exists for the given key, it returns it without executing the method.

snippet.java

java

@Service
public class PriceService {
    @Cacheable(value = "prices", key = "#productId")
    public BigDecimal getLatestPrice(String productId) {
        // Simulate slow database or API call
        return fetchFromExternalAPI(productId);
    }
}

spring

Breakdown

@Cacheable(value = "prices", key = "#productId")

Specifies the cache name and the SpEL expression used to generate the unique lookup key.

return fetchFromExternalAPI(productId)

This code only runs if the cache does not already contain a value for this productId.

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Declarative Method Caching with @Cacheable

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