Ehcache | 易学教程

EhCache and Database Refresh

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I am using Spring and ehcache. using a query I populate the data into the Cache, this process has to happen every 10 mins. Is there a configuration to set this?? Thanks in Advance Typically, ehCache would be used to give a ttl to invalidate your cache automatically. From what I can gather from your question, you are asking to automatically refresh the cache every ten minutes. For that, I would run a scheduled service that evicts and reloads. For example: @Cachable("Foo") public Foo getFoo() { ... } @CacheEvict("Foo") public void evictFoo(){ ... } @Scheduled(fixedRate = 10L * 60L * 1000L) //Ten

Spring: Multiple Cache Managers

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问题 I have a problem implementing a secong cache managers. At the moment I'm using EhCache, which is working fine. Additionally I would like to implement Java Simple Cache. My CacheConfiguration looks like this: CacheConfiguration.java @Configuration @EnableCaching @AutoConfigureAfter(value = { MetricsConfiguration.class }) @AutoConfigureBefore(value = { WebConfigurer.class, DatabaseConfiguration.class }) public class CacheConfiguration { private final javax.cache.configuration.Configuration

Trying to use EhCache using Spring and a custom GenericDao interface that extends the Hibernate's JpaRepository

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问题 Background Here is my working (simplified) GenericDao interface, which is implemented by any DomainDao : GenericDao.java @NoRepositoryBean public interface GenericDao<E extends Persistable<K>, K extends Serializable> extends JpaRepository<E, K> { public List<E> findAll(); public E persist(E entity); } GenericDaoImpl.java public class GenericDaoImpl<E extends Persistable<K>, K extends Serializable> extends SimpleJpaRepository<E, K> implements GenericDao<E, K> { private final

8.了解什么是 redis 的雪崩、穿透和击穿？redis 崩溃之后会怎么样？系统该如何应对这种情况？如何处理 redis 的穿透？

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作者：中华石杉面试题了解什么是 redis 的雪崩、穿透和击穿？redis 崩溃之后会怎么样？系统该如何应对这种情况？如何处理 redis 的穿透？面试官心理分析其实这是问到缓存必问的，因为缓存雪崩和穿透，是缓存最大的两个问题，要么不出现，一旦出现就是致命性的问题，所以面试官一定会问你。面试题剖析缓存雪崩对于系统 A，假设每天高峰期每秒 5000 个请求，本来缓存在高峰期可以扛住每秒 4000 个请求，但是缓存机器意外发生了全盘宕机。缓存挂了，此时 1 秒 5000 个请求全部落数据库，数据库必然扛不住，它会报一下警，然后就挂了。此时，如果没有采用什么特别的方案来处理这个故障，DBA 很着急，重启数据库，但是数据库立马又被新的流量给打死了。这就是缓存雪崩。大约在 3 年前，国内比较知名的一个互联网公司，曾因为缓存事故，导致雪崩，后台系统全部崩溃，事故从当天下午持续到晚上凌晨 3~4 点，公司损失了几千万。缓存雪崩的事前事中事后的解决方案如下。事前：redis 高可用，主从+哨兵，redis cluster，避免全盘崩溃。事中：本地 ehcache 缓存 + hystrix 限流&降级，避免 MySQL 被打死。事后：redis 持久化，一旦重启，自动从磁盘上加载数据，快速恢复缓存数据。用户发送一个请求，系统 A 收到请求后，先查本地 ehcache 缓存

EHCache error on looking up by cache key

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I am using EHCache 1.5.0 on a webapp running on a WebLogic 9.1 instance. Once in a while I run into the following error while getting an element from cache or while checking if an item exists in cache. Has anyone else seen this issue? Any suggestions on how to fix this would be great. Code that causes this issue: getMyCache().isKeyInCache(cacheKey) ehcache configuration: maxElementsInMemory="10000" eternal="false" timeToIdleSeconds="120" timeToLiveSeconds="120" overflowToDisk="true" diskPersistent="true" I am using Spring to get an instance of CacheManager and here is my bean definition: <bean

Spring hibernate ehcache setup

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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="true" diskPersistent="false" timeToIdleSeconds="0" timeToLiveSeconds="300" memoryStoreEvictionPolicy=

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

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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/v3' xmlns:jsr107='http://www.ehcache.org/v3/jsr107' xsi:schemaLocation=" http://www.ehcache.org/v3

Clear Hibernate 2nd level cache after manually DB update

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问题 Shortly, I have an entity mapped to view in DB (Oracle) with enabled 2nd level Cache (read only strategy) -- ehcache. If I manually update some column in DB -- cache will not be updated. I did not find any ways to do this. Only if updates will be done through Hibernate entity. May I somehow implement this feature? Maybe Job to monitor table (or view)? Or maybe there is some method to notify Hibernate about change in DB in concrete table. Thanks for future answers! 回答1: According to Hibernate

write behind cache Ehcache new feature?

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问题 i looking for guide/document/tutorial on how to use this new feature write-behind-cache in ehcache? Is there any demo in spring+jpa+ehcache+hibernate? just to clariyfing, write-behind-cache mean each time we persist entity, it will be written into cache rather than into database correct? 回答1: The fact that Ehcache offers Write-Behind Caching does NOT mean that any piece of software using Ehcache, like Hibernate, can leverage it without modification. From Terracotta's Hibernate Integration

java.lang.NullPointerException Hibernate used with Ehcache

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I used Hibernate 4.1.2 with Ehcache 2.4.3 (shipped together with hibernate when donwloaded hibernate). My hibernate.cfg.xml : <?xml version='1.0' encoding='utf-8'?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <property name="hibernate.connection.driver_class"> com.microsoft.sqlserver.jdbc.SQLServerDriver </property> <property name="hibernate.connection.url"> jdbc:sqlserver://localhost:1433;databaseName=Stock_indices</property> <property