SpringCache Ehcache 3 Kullanımı

Giriş

Açıklaması şöyle

The EhCache is an open source Java based cache used to boost performance. It stores the cache in memory and disk (SSD).

EhCache used a file called ehcache.xml. The EhCacheCacheManager is automatically configured if the application found the file on the classpath.

Maven

Şu satırı dahil ederiz

<dependency>
    <groupId>org.ehcache</groupId>
    <artifactId>ehcache</artifactId>
    <version>3.9.6</version>
</dependency>
<dependency>
    <groupId>javax.cache</groupId>
    <artifactId>cache-api</artifactId>
    <version>1.1.0</version>
    <scope>runtime</scope>
</dependency>

Açıklaması şöyle

You need both JCache and EhCache if you are using EhCache v3. In the previous v2, JCache was not needed as it was not built upon the JSR standard.

Bundan sonra cache ayarlarını ya xml ya da kodla vermek gerekir.

XML İle Belirtmek

application.properties dosyasında şöyle yaparız

spring.cache.jcache.config=classpath:ehcache.xml

ehcache.xml
Örnek
Şöyle yaparız.

<config
  xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
  xmlns='http://www.ehcache.org/v3'
  xsi:schemaLocation="http://www.ehcache.org/v3
                      http://www.ehcache.org/schema/ehcache-core.xsd">

  <cache alias="cache_10s">
    <expiry>
      <ttl unit="seconds">10</ttl>
    </expiry>
    <heap unit="entries">10000</heap>
  </cache>

  <cache alias="cache_30s">
    <expiry>
      <ttl unit="seconds">30</ttl>
    </expiry>
    <heap unit="entries">10000</heap>
  </cache>
</config>

Örnek

Şöyle yaparız. Burada offheap ile JVM dışında kulanılabilecek bellek belirtiliyor.

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns="http://www.ehcache.org/v3"
   xmlns:jsr107="http://www.ehcache.org/v3/jsr107"
   xsi:schemaLocation="
     http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.0.xsd
     http://www.ehcache.org/v3/jsr107 http://www.ehcache.org/schema/ehcache-107-ext-3.0.xsd">

  <cache alias="allUserCache">
    <key-type>java.lang.String</key-type>
    <value-type>java.util.List</value-type>
    <expiry>
      <ttl unit="seconds">30</ttl>
    </expiry>
    <resources>
      <heap unit="entries">10</heap>
      <offheap unit="MB">10</offheap>
    </resources>
  </cache>
</config>

Kodla Belirtmek

1. org.ehcache.config.builders.CacheManagerBuilder kullanılır

Ehcache 3 CacheManagerBuilder Sınıfı yazında Ehcache3 ayarları görülebilir.

JCacheCacheManager Sınıfı - EhCache 3 yazında Ehcache3 ile Spring'in nasıl birleştirildiği görülebilir.

2. Eh107Configuration kullanılır

Örnek

Şöyle yaparız. Burada  org.ehcache.config.builders.CacheManagerBuilder kullanılarak bir org.ehcache.config.CacheConfiguration yaratılıyor. 

Daha sonra org.ehcache.jsr107.Eh107Configuration kullanılarak CacheConfiguration nesnesi 

JSR-107 javax.cache.configuration.Configuration haline çevriliyor.

Daha sonra JSR-107 configuration nesnesi yine JSR-107 javax.cache.spi.CachingProvider nesnesine takılıyor

import org.ehcache.config.CacheConfiguration;
import org.ehcache.config.builders.CacheConfigurationBuilder;
import org.ehcache.config.builders.ExpiryPolicyBuilder;
import org.ehcache.config.builders.ResourcePoolsBuilder;
import org.ehcache.config.units.MemoryUnit;
import org.ehcache.jsr107.Eh107Configuration;
import javax.cache.CacheManager;
import javax.cache.Caching;
import javax.cache.spi.CachingProvider;
import java.time.Duration;

@Configuration
public class AppConfig {

  @Bean
  public CacheManager EhcacheManager() {

    CacheConfiguration<String, Person> cachecConfig = CacheConfigurationBuilder
      .newCacheConfigurationBuilder(String.class,
                        Person.class,
                        ResourcePoolsBuilder.newResourcePoolsBuilder()
                                .offheap(10, MemoryUnit.MB)
                                .build())
      .withExpiry(ExpiryPolicyBuilder.timeToIdleExpiration(Duration.ofSeconds(10)))
      .build();

    CachingProvider cachingProvider = Caching.getCachingProvider();
    CacheManager cacheManager = cachingProvider.getCacheManager();

    javax.cache.configuration.Configuration<String, Person> configuration = 
      Eh107Configuration.fromEhcacheCacheConfiguration(cachecConfig);
    cacheManager.createCache("cacheStore", configuration);
    return cacheManager;
  }
}