Custom Key Generator Spring Cache

15.04.2020 admin

Sep 15, 2015 The name of the custom cache resolver: condition: This is Spring Expression Language (SPeL) for the conditional caching. For the method. Key: Spring Expression Language for computing the key dynamically: keyGenerator: The bean name of the custom key generator to use: unless: Spring Expression Language for bypassing caching for specific.

Spring Boot Cache Key
Spring Cacheable Custom Key Generator
Spring Cache Custom Key Generator

SimpleKeyGenerator is the default generator provided by Spring. Spring automatically configures this as the KeyGenerator if one has not been configured. It uses the method parameters provided to generate the key. If you have two methods that use the same cache name and the same set of parameter types. Dec 20, 2016 Sitecore, by default, provides varies options like Vary by Data, Vary by Query String to enable HTML cache (more information about Sitecore caching could be found here). Sometimes none of these options (based on component built type) help the component to get cached by Sitecore cache. In this article I will describe how to introduce.

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:

@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.
このクイックチュートリアルでは、Spring Cacheを使用してカスタムキージェネレータを作成する方法を説明します。上記のモジュールの紹介については、この記事へを参照してください。.

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 SimpleKey composed 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:

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:

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.

Spring Boot Cache Key

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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