Ehcache

Spring Ehcache3 cause exception with with key-type and value-type

由 守給你的承諾、 提交于 2019-12-22 12:36:27
问题 I try to use ehcache3 on project with spring 4.3. I configured cache manager: <cache:annotation-driven /> <bean id="cacheManager" class="org.springframework.cache.jcache.JCacheCacheManager"> <property name="cacheManager"> <bean class="org.springframework.cache.jcache.JCacheManagerFactoryBean"> <property name="cacheManagerUri" value="classpath:ehcache.xml"/> </bean> </property> </bean> And ehcache.xml : <config xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns='http://www.ehcache.org

Spring hibernate ehcache setup

由 此生再无相见时 提交于 2019-12-22 12:26:36
问题 I have some problems getting the hibernate second level cache to work for caching domain objects. According to the ehcache documentation it shouldn't be too complicated to add caching to my existing working application. I have the following setup (only relevant snippets are outlined): @Entity @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE public void Entity { // ... } ehcache-entity.xml <cache name="com.company.Entity" eternal="false" maxElementsInMemory="10000" overflowToDisk=

Grails cache-ehcache plugin and TTL values

由 若如初见. 提交于 2019-12-22 06:27:23
问题 Can anyone confirm if TTL settings e.g. timeToLiveSeconds can be set using the grails cache plugin with the ehcache extension? The documentation for the base plugin explicitly states that TTL is not supported, but the ehcache extension mentions these values. So far I've had no success setting TTL values for my cache: grails.cache.config = { cache { name 'messages' maxElementsInMemory 1000 eternal false timeToLiveSeconds 120 overflowToDisk false memoryStoreEvictionPolicy 'LRU' } } @Cacheable(

When does the CPU benefit of having an Hibernate 2nd level cache outweigh the initial hit

由 旧巷老猫 提交于 2019-12-22 05:57:32
问题 When does the CPU benefit of having an object added to Hibernate 2nd level object cache outweigh the initial hit. I am currently using Hibernate without 2nd level cache. This is for an application that processes music files (www.jthink.net/songkong) and it uses Hibernate so it can scale with more data, i.e it can process 100,000 songs with little more memory than 1000 songs. Once the songs have been processed then those songs are of no interest (unless the user runs Undo) As I understand it

Ehcache - using SelfPopulatingCache when data is not present

由 混江龙づ霸主 提交于 2019-12-22 05:19:29
问题 I am using the EhCache's decorator SelfPopulatingCache and have an issue when the cache tries to load a new entry, but it's non-existent (i.e. it doesn't exist in the database). So the cache will put a null value into the cache, to unblock any other gets on the key, but then the next thread will do the same database call because it received 'null' from the cache. which means it thinks the entry needs to be loaded - even though in reality it's null because the data doesn't exists anywhere. I

Performance of JBoss Cache and Ehcache

由 ☆樱花仙子☆ 提交于 2019-12-22 04:00:16
问题 I'm considering to use to implement a cache either JBoss Cache or Ehcache. After looking at both APIs I has the intuition that JBoss is probably a little bit more memory efficient than Ehcache since it can put raw objects into the cache while Ehcache needs to wrap the data in a Element object. I set up a quick bench inserting repeatedly key, value tuples in the cache. The key and values classes are very simple: Key: public class Key implements Serializable { private static final long

Exposing Hibernate (cache) statistics through JMX with Spring in Tomcat

由 只愿长相守 提交于 2019-12-21 21:35:04
问题 Collecting Hibernate/Ehcache statistics and exposing them through JMX in Spring-based setups seems easy. The Internet has lots of resources that help e.g. http://snippets.dzone.com/posts/show/11159 However, all those articles assume one is working with a Hibernate session factory of some sort. I'm not - my entities are JPA annotated and I use a javax.persistence.EntityManager . If I were deploying to a Java EE container I might have been able to obtain a Hibernate session factory through JNDI

Spring Boot 默认的指标数据从哪来的？

由 非 Y 不嫁゛ 提交于 2019-12-21 21:26:42
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 了解有关 Spring Boot 默认指标及其来源的更多信息。 您是否注意到 Spring Boot 和 Micrometer 为您的应用生成的所有默认指标？如果没有 - 您可以将 actuator 依赖项添加到项目中，然后点击 / actuator / metrics 端点，在那里您将找到有关 JVM 、进程、Tomcat、流量等的有用信息。然后，添加一些 缓存 ， 数据源 或 JPA 依赖项，甚至会出现更多指标。如果您想知道它们是如何结束的，我们可以在哪里找到关于它们所描述的参数的解释，那么这篇文章就是为您准备的。 显示指标 为了让它井然有序，让我们从如何在 Spring Boot 应用程序中显示指标开始。如果您已经知道了，可以跳过这一部分。 Spring Boot中的指标由 micrometer.io 处理。但是，如果您使用 actuator ，则不需要向项目添加 micrometer 依赖项，因为 actuator 已经依赖于它。即使您对它提供的端点不感兴趣，也希望您使用 actuator ，因为这是通过其 AutoConfigurations 注册许多指标的模块。稍后我们会详细讨论。 因此，首先，只需将执行器依赖项添加到项目中（这里是 build.gradle.kts ） dependencies {

Spring支持的CacheManager

由 天涯浪子 提交于 2019-12-21 15:26:01
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 数据缓存 Cache 为何要用缓存、缓存的目的是为了什么？ 我们知道一个程序的瓶颈在于数据库，内存的速度远远大于硬盘的速度，当我们一次又一次 请求数据库或远程服务时会导致大量的时间耗费在数据库操作或远程方法调用上，以致于 程序性能恶化，使用数据缓存可以解决此问题 属性 描述 SimpleCacheManager 使用简单的Collection来存储缓存，主要用来测试用途 ConcurrentMapCacheManager 使用ConcurrentMap来存储缓存 NoOpCacheManager 仅测试用途，不会实际存储缓存 EhCacheCacheManger 使用EhCache作为缓存技术 GuavaCacheManager 使用Google Guava的GuavaCache作为缓存技术 HazelcastCacheManager 使用Hazelcast作为缓存技术 JCacheCacheManager 支持JCache（JSR-107）标准的实现作为缓存技术 RedisCacheManager 使用Redis作为缓存技术 缓存注解式 注解 描述 @Cacheable 在方法执行前Spring先查看缓存中是否有数据，如果有数据则直接返回缓存 数据。反之调用方法并将方法返回值放入缓存填充。 @CachePut

Simple Java caching library or design pattern?

由 心不动则不痛 提交于 2019-12-21 08:16:50
问题 I need to frequently access the result of a time-consuming calculation. The result changes infrequently, so I have to recalculate the data from time to time but it is ok to use the outdated result for a while. What would be the easiest way to do this and is there an existing library method or design pattern? I am thinking of something like private static List myCachedList = null; ... // refresh list once in 3600 seconds if (needsRefresh(myCachedList, 3600)) { // run the calculation
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