[JAVA] cache function

cache function

1. ehcache.xml 등록

<cache

name="mainPage"

eternal="false"

maxElementsInMemory="1000"

timeToIdleSeconds="0"

timeToLiveSeconds="600"

overflowToDisk="false"

diskPersistent="false"

copyOnRead="false"

copyOnWrite="false"

memoryStoreEvictionPolicy="LRU"/>

2. cahe function

<%@page pageEncoding="utf-8"%>

<%@page import="org.springframework.cache.Cache"%>

<%@page import="org.springframework.cache.Cache.ValueWrapper"%>

<%@page import="org.springframework.cache.ehcache.EhCacheCacheManager"%>

<%@page import="org.springframework.cache.CacheManager"%>

<%@include file="/nci/psj/common_top.jsp" %>

<%!

/*

 * 객체를 cache에 저장한다.

 *

 * @param request

 * @param cacheKey cache 키

 * @param elementKey cache에 저장할 obejct 키

 * @param cacheObject cache에 저장할 object

 */

void addCacheElement(HttpServletRequest request, String cacheKey, 

Object elementKey, Object cacheObject){

try{

CacheManager cm = getApplicationContext(request).getBean(EhCacheCacheManager.class);

   

   Cache cache = cm.getCache(cacheKey);

if(cache != null){

cache.put(elementKey, cacheObject);

}

}catch(Exception e){

e.printStackTrace();

}

}

/*

 * cache에서 객체를 가져온다. cache에 저장된 객체가 없으면 null 리턴.

 *

 * @param request

 * @param cacheKey cache 키

 * @param elementKey cache에 저장된 obejct 키

 */

Object getCacheElement(HttpServletRequest request, String cacheKey, 

Object elementKey){

Object cacheObj = null;

try{

CacheManager cm = getApplicationContext(request).getBean(EhCacheCacheManager.class);

   

 Cache cache = cm.getCache(cacheKey);

if(cache != null){

ValueWrapper value = cache.get(elementKey);

if(value != null){

cacheObj = value.get();

}

}

}catch(Exception e){

e.printStackTrace();

}

return cacheObj;

} 

/*

 * cache를 삭제한다. 

 *

 * @param request

 * @param cacheKey cache 키

 */

Object removeCache(HttpServletRequest request, String cacheKey){

Object cacheObj = null;

try{

CacheManager cm = getApplicationContext(request).getBean(EhCacheCacheManager.class);

      Cache cache = cm.getCache(cacheKey);

if(cache != null){

cache.clear();

}

}catch(Exception e){

e.printStackTrace();

}

return cacheObj;

}

/*

 * cache에서 객체를 삭제한다. 

 *

 * @param request

 * @param cacheKey cache 키

 * @param elementKey cache에 저장된 obejct 키

 */

Object removeCacheElement(HttpServletRequest request, String cacheKey, Object elementKey){

Object cacheObj = null;

try{

CacheManager cm = getApplicationContext(request).getBean(EhCacheCacheManager.class);

Cache cache = cm.getCache(cacheKey);

if(cache != null){

cache.evict(elementKey);

}

}catch(Exception e){

e.printStackTrace();

}

return cacheObj;

}

%>