{"id":91597,"date":"2019-05-08T16:00:24","date_gmt":"2019-05-08T13:00:24","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=91597"},"modified":"2019-05-07T14:32:16","modified_gmt":"2019-05-07T11:32:16","slug":"multiple-cache-configurations-caffeine-spring-boot","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2019\/05\/multiple-cache-configurations-caffeine-spring-boot.html","title":{"rendered":"Multiple Cache Configurations with Caffeine and Spring Boot"},"content":{"rendered":"

Caching is key for performance of nearly every application. Distributed caching<\/a> is sometimes needed, but not always. In many cases a local cache would work just fine and there\u2019s no need for the overhead and complexity of the distributed cache.<\/p>\n

So, in many applications, including plain Spring and Spring Boot, you can use @Cacheable<\/code> on any method and its result will be cached so that the next time the method is invoked, the cached result is returned.<\/p>\n

Spring has some default cache manager implementations, but external libraries are always better and more flexible than simple implementations. Caffeine, for example is a high-performance<\/a> Java cache library<\/a>. And Spring Boot comes with a CaffeineCacheManager<\/code>. So, ideally, that\u2019s all you need \u2013 you just create a cache manager bean and you have caching for your @Cacheable<\/code> annotated-methods.<\/p>\n

However, the provided cache manager allows you to configure just one cache specification. Cache specifications<\/a> include the expiry time, initial capacity, max size, etc. So all of your caches under this cache manager will be created with a single cache spec. The cache manager supports a list of predefined caches as well as dynamically created caches, but on both cases a single cache spec is used. And that\u2019s rarely useful for production. Built-in cache managers are something you have to be careful with<\/a>, as a general rule.<\/p>\n

There are a few<\/a> blogposts<\/a> that tell you how to define custom caches with custom specs. However, these options do not support the dynamic, default cache spec usecase that the built-in manager supports. Ideally, you should be able to use any name in @Cacheable<\/code> and automatically a cache should be created with some default spec, but you should also have the option to override that for specific caches.<\/p>\n

That\u2019s why I decided to use a simpler approach than defining all caches in code that allows for greater flexibility. It extends the CaffeineCacheManager<\/code> to provide that functionality:<\/p>\n

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\/**<\/code><\/div>\n
 <\/code>* Extending Caffeine cache manager to allow flexible per-cache configuration<\/code><\/div>\n
 <\/code>*\/<\/code><\/div>\n
public<\/code> class<\/code> FlexibleCaffeineCacheManager <\/code>extends<\/code> CaffeineCacheManager <\/code>implements<\/code> InitializingBean {<\/code><\/div>\n
    <\/code>private<\/code> Map<String, String> cacheSpecs = <\/code>new<\/code> HashMap<>();<\/code><\/div>\n
 <\/div>\n
    <\/code>private<\/code> Map<String, Caffeine<Object, Object>> builders = <\/code>new<\/code> HashMap<>();<\/code><\/div>\n
 <\/div>\n
    <\/code>private<\/code> CacheLoader cacheLoader;<\/code><\/div>\n
 <\/div>\n
    <\/code>@Override<\/code><\/div>\n
    <\/code>public<\/code> void<\/code> afterPropertiesSet() <\/code>throws<\/code> Exception {<\/code><\/div>\n
        <\/code>for<\/code> (Map.Entry<String, String> cacheSpecEntry : cacheSpecs.entrySet()) {<\/code><\/div>\n
            <\/code>builders.put(cacheSpecEntry.getKey(), Caffeine.from(cacheSpecEntry.getValue()));<\/code><\/div>\n
        <\/code>}<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/div>\n
    <\/code>@Override<\/code><\/div>\n
    <\/code>@SuppressWarnings<\/code>(<\/code>\"unchecked\"<\/code>)<\/code><\/div>\n
    <\/code>protected<\/code> Cache<Object, Object> createNativeCaffeineCache(String name) {<\/code><\/div>\n
        <\/code>Caffeine<Object, Object> builder = builders.get(name);<\/code><\/div>\n
        <\/code>if<\/code> (builder == <\/code>null<\/code>) {<\/code><\/div>\n
            <\/code>return<\/code> super<\/code>.createNativeCaffeineCache(name);<\/code><\/div>\n
        <\/code>}<\/code><\/div>\n
 <\/div>\n
        <\/code>if<\/code> (<\/code>this<\/code>.cacheLoader != <\/code>null<\/code>) {<\/code><\/div>\n
            <\/code>return<\/code> builder.build(<\/code>this<\/code>.cacheLoader);<\/code><\/div>\n
        <\/code>} <\/code>else<\/code> {<\/code><\/div>\n
            <\/code>return<\/code> builder.build();<\/code><\/div>\n
        <\/code>}<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/div>\n
    <\/code>public<\/code> Map<String, String> getCacheSpecs() {<\/code><\/div>\n
        <\/code>return<\/code> cacheSpecs;<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/div>\n
    <\/code>public<\/code> void<\/code> setCacheSpecs(Map<String, String> cacheSpecs) {<\/code><\/div>\n
        <\/code>this<\/code>.cacheSpecs = cacheSpecs;<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/div>\n
    <\/code>public<\/code> void<\/code> setCacheLoader(CacheLoader cacheLoader) {<\/code><\/div>\n
        <\/code>super<\/code>.setCacheLoader(cacheLoader);<\/code><\/div>\n
        <\/code>this<\/code>.cacheLoader = cacheLoader;<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

In short, it create one caffeine builder per spec and uses that instead of the default builder when a new cache is needed.

<\/div> <\/div><\/p>\n

Then a sample XML configuration would look like this:<\/p>\n

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<<\/code>bean<\/code> id<\/code>=<\/code>\"cacheManager\"<\/code> class<\/code>=<\/code>\"net.bozho.util.FlexibleCaffeineCacheManager\"<\/code>><\/code><\/div>\n
    <\/code><<\/code>property<\/code> name<\/code>=<\/code>\"cacheSpecification\"<\/code> value<\/code>=<\/code>\"expireAfterWrite=10m\"<\/code>\/><\/code><\/div>\n
    <\/code><<\/code>property<\/code> name<\/code>=<\/code>\"cacheSpecs\"<\/code>><\/code><\/div>\n
        <\/code><<\/code>map<\/code>><\/code><\/div>\n
            <\/code><<\/code>entry<\/code> key<\/code>=<\/code>\"statistics\"<\/code> value<\/code>=<\/code>\"expireAfterWrite=1h\"<\/code>\/> <\/code><\/div>\n
       <\/code><\/<\/code>map<\/code>><\/code><\/div>\n
    <\/code><\/<\/code>property<\/code>><\/code><\/div>\n
<\/<\/code>bean<\/code>><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

With Java config it\u2019s pretty straightforward \u2013 you just set the cacheSpecs<\/code> map.<\/p>\n

While Spring has already turned into a huge framework that provides all kinds of features, it hasn\u2019t abandoned the design principles of extensibility.<\/p>\n

Extending built-in framework classes is something that happens quite often, and it should be in everyone\u2019s toolbox. These classes are created with extension in mind \u2013 you\u2019ll notice that many methods in the CaffeineCacheManager<\/code> are protected<\/code>. So we should make use of that whenever needed.<\/p>\n

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\n

Published on Java Code Geeks with permission by Bozhidar Bozhanov, partner at our JCG program<\/a>. See the original article here: Multiple Cache Configurations with Caffeine and Spring Boot<\/a><\/p>\n

Opinions expressed by Java Code Geeks contributors are their own.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Caching is key for performance of nearly every application. Distributed caching is sometimes needed, but not always. In many cases a local cache would work just fine and there\u2019s no need for the overhead and complexity of the distributed cache. So, in many applications, including plain Spring and Spring Boot, you can use @Cacheable on …<\/p>\n","protected":false},"author":55,"featured_media":240,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[854],"class_list":["post-91597","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-spring-boot"],"yoast_head":"\nMultiple Cache Configurations with Caffeine and Spring Boot - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Interested to learn about Multiple Cache? 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