Ehcache | 易学教程

Unable to add cacheDecorator to ehcache

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问题 Using "Inline Refresh Ahead" as described at : http://terracotta.org/documentation/4.1/bigmemorymax/api/refresh-ahead#scheduled-refresh-ahead I updated my cache entry to : <?xml version="1.0" encoding="UTF-8"?> <ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd"> <defaultCache eternal="true" maxElementsInMemory="100" overflowToDisk="false" /> <cache name="myCache" maxElementsInMemory="10000" eternal="true"

Issue with Hash Map Space

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问题 In my Java code, I am using Guava's Multimap (com.google.common.collect.Multimap) by using this: Multimap<Integer, Integer> Index = HashMultimap.create() Here, Multimap key is some portion of a URL and value is another portion of the URL (converted into an integer). Now, I assign my JVM 2560 Mb (2.5 GB) heap space (by using Xmx and Xms). However, it can only store 9 millions of such (key,value) pairs of integers (approx 10 million). Now, issue is, I can provide JVM only limited amount of

Issue with Hash Map Space

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How does EHCache implement its transactions?

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问题 The question might sound vague but I'm trying to understand the general concept of the EHCache transaction ability. Assuming I configure EHCache as a memory cache and I also configure it to cache a MyObject . Does EHCache clone the instance of MyObject I'm retrieving if this is done as a part of a transaction? I'm mainly asking because I was advised (in the answer to my question) to use EHCache and I'm worried about its performance impact. MyObject is a medium-weight object and I'd rather not

WEB性能优化--缓存

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缓存是位于内存中的一块用于临时存储数据的区域,在java web的开发中,主要用来优化程序与数据库的交互,将频繁的sql查询操作或增,删,改(一般的,查询操作远大于增,删,改的操作),只当第一次请求时,直接请求数据库,然后把结果放到缓存中,后续若再有相同的操作请求,直接去缓存中取值,大大减轻了数据库服务器的压力.(java项目的开发中,数据库是最薄弱的一环) 一.缓存的简单模拟实现代码 1>没有缓存时的代码 public User findById(Integer id){ String sql="SELECT * FROM T_USER WHERE id=?"; return DBHelp.executeQueryForObject(User.class,sql,id); } 2>加上缓存后的代码 public User findById(Integer id){ /**首先去缓存中查找对象,有就直接返回; 没有在去数据库中操作,并且把操作后的结果放入缓存中,方便后续的使用 */ User user = cache.get("user"+id); if(user==null){ String sql="SELECT * FROM T_USER WHERE id=?"; return DBHelp.executeQueryForObject(User.class,sql,id);

Hibernate does not evict query cache (non repeatable read issue)

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问题 I am a new to java/spring/hibernate and really felt in love in java after several years of .Net programming. now I am working on web app using Spring (MVC, declarative transactions) and Hibernate (3.6, as cache provier - ehCache 2.5). I've got some read only and read-write enitties that I would like to cache using Hibernate second cache and query cache. everything was alright when I used caching for read only entities. I added read-write entity and ran performance tests using jMeter. For read

Ehcache not replicating - (solution)

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问题 Thought I'd let this out to anyone having similar problems. Info: Running linux (ubuntu), x64, latest java-version (1.7.25), latest tomcat (7.40). I had set up two apache tomcats locally, and the same webapp on both tomcats, to test some ehcache functionality and the cache replicated and all was great. Once I set up a dedicated server with the second tomcat instance the EhCache didn't replicate between my PC and the server (still in the testing phase). All the configs were basically the same

EE8 JCache annotation CacheResult doesn't work

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问题 I'm developing a WEB APP under JBoss EAP 7.2 (EE8) using EhCache as JCache implementation (JSR 107) I have this code: @Inject CacheManager cacheManager; @CacheResult(cacheName = "roles") public List<RoleDTO> get(@CacheKey String id) { return service.getRoles(id); } public List<RoleDTO> getRoles(final String userId) { final List<RoleDTO> output = get(userId); return output; } According to this article I read, I'd expect the second time I access the get(userId) method should use cache and

java.lang.NullPointerException Hibernate used with Ehcache

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问题 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=

Do caches in ehcache.xml inherit from defaultCache?

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问题 If I have the following configuration: <defaultCache timeToIdleSeconds="120" timeToLiveSeconds="120" /> <cache name="test" timeToLiveSeconds="300" /> What will be the value of timeToIdleSeconds for the cache test ? Will it be inherited from the default cache, and thus be equal to 120, or will it take the default value as given in the manual, which is 0 (infinity)? 回答1: The timeToIdleSeconds will be default value and not inherit from "defaultCache". The "defaultCache" is a bit misnomer