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利用Spring AOP 更新memcached 缓存策略的实现(二)

2016-03-20 21:50 1191 查看
承接上文,本人终于履行承诺,实现了不使用数据库实现更新缓存的方法,上文链接:利用Spring
AOP 更新memcached 缓存策略的实现(一)

实现思路:

1. 执行业务逻辑查询时,第一次在memcached中不存在,则将查询结果序列化后存入memcached中(key:业务方法名+参数类型+参数值+版本号 转 MD5),并且存入当前业务包的版本号(key:业务包名,value:版本号)

2. 执行业务逻辑查询时,检索memcached中已存在key,反序列化后返回Sevice

3. 修改操作时,修改业务逻辑之后,对应业务的包名版本号自增长,查询时重新存入memcached,原key值慢慢的慢慢的就等着死亡吧~~

具体代码:



1. 配置spring aop 查看上文

2. 下载memcached的jar包,相关方法请参考本人之前的博客:这里

3. 编写两个注解,分别为@Cache和@CacheUpdate

package com.dsideal.common;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
* 用于查找的时候,放置缓存信息
* @author Administrator
*
*/
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
public @interface Cache {
//key的前缀
String prefix();
//缓存有效期 1000*60*60*2=2小时
long expiration() default 1000*60*60*2;
}


package com.dsideal.common;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
/**
* 修改时标注
* @author 周枫
*
*/
public @interface CacheUpdate {
//key的前缀
String prefix();
}


4. memcached的配置类为

package com.dsideal.sys.memcached;

import java.util.Date;

import com.danga.MemCached.MemCachedClient;
import com.danga.MemCached.SockIOPool;

public class MemcacheBlog {
// 创建全局的唯一实例

static MemCachedClient memCachedClient=null;

// 设置与缓存服务器的连接池
static{
//memcached服务器端IP和端口
String[] servers = {"192.168.100.102:11211"};
SockIOPool pool = SockIOPool.getInstance();
pool.setServers(servers);
pool.setFailover(true);
// 设置初始连接数、最小和最大连接数以及最大处理时间
/*    pool.setInitConn(5);
pool.setMinConn(5);
pool.setMaxConn(250);
pool.setMaxIdle(1000 * 60 * 60 * 6); */
pool.setInitConn(10);
pool.setMinConn(5);
pool.setMaxConn(250);
pool.setMaintSleep(30);  // 设置主线程的睡眠时间
// 设置TCP的参数,连接超时等
pool.setNagle(false);
pool.setSocketTO(3000);
pool.setAliveCheck(true);

pool.initialize();

memCachedClient = new MemCachedClient();
memCachedClient.setPrimitiveAsString(true);
}

/**
* <p>功能:
* get:获取数据的方法
* get_multi:一次取得多条数据;getmulti可以非同步地同时取得多个键值, 其速度要比循环调用get快数十倍
* </p>
* @author 周枫
* @date 2013-4-3
* @param
* @return Object
*/
public static Object get(String key)
{
return memCachedClient.get(key);
}
/**
* <p>功能:
* add:仅当存储空间中不存在键相同的数据时才保存
* replace:仅当存储空间中存在键相同的数据时才保存
* set:与add和replace不同,无论何时都保存</p>
* @author 周枫
* @date 2013-4-3
* @param
* @return Object
*/
public static boolean set(String key,Object o)
{
return memCachedClient.set(key, o);
}
public static boolean set(String key,Object o,Date ExpireTime)
{
return memCachedClient.set(key, o, ExpireTime);
}
public static boolean exists(String key)
{
return memCachedClient.keyExists(key);
}
public static boolean delete(String key)
{
return memCachedClient.delete(key);
}
public static boolean replace(String key,Object o)
{
return memCachedClient.replace(key, o);
}

}


5. spring-aop实现类

package com.dsideal.sys.memcached;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.annotation.Resource;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import com.alibaba.fastjson.JSON;

import com.dsideal.common.Cache;
import com.dsideal.common.CacheUpdate;
import com.dsideal.common.Flush;
import com.dsideal.sys.bean.CacheLog;
import com.dsideal.sys.bean.SysLoginPersonBean;
import com.dsideal.sys.service.ICacheLogService;
import com.dsideal.common.MD5;

@Aspect
@Component
public class CacheAopNoMysql {

//  @Pointcut("execution(* add*(..)) || (execution(* del*(..))) || (execution(* get*(..)))")
//* com.dsideal.sys.service.impl.*.getMemcache*(..)
@Pointcut("execution (* com.dsideal.sys.service.impl.*.memcache*(..))")
public void pointcut(){}

//方法执行前调用
//@Before("pointcut()")
public void before() {
System.out.println("before");  //2
}

@Resource
private ICacheLogService cacheLogService;

//方法执行的前后调用
@Around("pointcut()")
//ProceedingJoinPoint 目标类连接点对象
public Object doAround(ProceedingJoinPoint call) throws Throwable{
//返回最终结果
Object result = null;
//定义版本号,默认为1
String prefixValue = "1";
Method[] methods = call.getTarget().getClass().getDeclaredMethods();
Signature signature = call.getSignature();
MethodSignature methodSignature = (MethodSignature) signature;
Method method = methodSignature.getMethod();
for(Method m:methods){
//循环方法,找匹配的方法进行执行
if(m.getName().equals(method.getName())){
//增加
if(m.isAnnotationPresent(Cache.class)){
Cache cache = m.getAnnotation(Cache.class);
Object tempType = m.getGenericReturnType();
//System.out.println(m.get);
//如果memcached中存在
if(cache!=null){
//获取注解前缀,这里为 sys,实际使用是为各个业务包名
String prefix = cache.prefix();
//获取版本号
if(null != MemcacheBlog.get(prefix)){
prefixValue = MemcacheBlog.get(prefix).toString();
}
//获取方法名+参数类型+参数值+版本号 转 MD5
String tempKey = this.getKey(method, call.getArgs(), prefixValue);
//存入memcached的最终key值
String key = prefix+"_"+tempKey;
result =MemcacheBlog.get(key);
if(null == result){
try {
//执行aop拦截的方法
result = call.proceed();
//获取注解配置memcached死亡时间
long expiration = cache.expiration();
//1000*60*60*2==2小时过期
Date d=new Date();
//memcached死亡时间
d=new Date(d.getTime()+expiration);
//利用fastjson序列化list<bean>存入memcached中
//具体fastjson使用方法请参考:http://www.cnblogs.com/cczhoufeng/archive/2013/04/03/2997871.html
if(prefixValue.equals("1")){
MemcacheBlog.set(prefix, prefixValue);
}
MemcacheBlog.set(key, JSON.toJSONString(result), d);
} catch (Throwable e) {
e.printStackTrace();
}
}  else {
//如果memcached中存在结果,需要将result反序列化后返回结果
String memresult = result.toString();
//反序列化
List<SysLoginPersonBean> list = JSON.parseArray(memresult, SysLoginPersonBean.class);
result = list;
//这里是利用fastjson反序列化输出的方法
//String memresult = result.toString();
//List<SysLoginPersonBean> list =  JSON.parseArray(memresult, SysLoginPersonBean.class);
//for (int i = 0; i < list.size(); i++) {
//    System.out.println(list.get(i).getReal_name());
//}
}

}
} else  if(m.isAnnotationPresent(CacheUpdate.class)){
//如果修改操作时
CacheUpdate cUpdate = m.getAnnotation(CacheUpdate.class);
if(cUpdate!=null){
result = call.proceed();
String prefix = cUpdate.prefix();
//获取当前版本号
if(null != MemcacheBlog.get(prefix)){
prefixValue = MemcacheBlog.get(prefix).toString();
}
//修改后,版本号+1
MemcacheBlog.replace(prefix, Integer.parseInt(prefixValue.toString()) + 1);
System.out.println(MemcacheBlog.get(prefix).toString());
}
}else{
try {
result = call.proceed();
} catch (Throwable e) {
e.printStackTrace();
}
}
break;
}
}

return result;
}

/**
* 组装key值
* @param method
* @param args
* @return
*/
private String getKey(Method method, Object [] args, String prefixValue){
StringBuffer sb = new StringBuffer();
//获取方法名
String methodName = method.getName();
//获取参数类型
Object[] classTemps = method.getParameterTypes();
//存入方法名
sb.append(methodName);

for (int i = 0; i < args.length; i++) {
sb.append(classTemps[i]+"&");
if (null == args[i]) {
sb.append("null");
} else if ("".equals(args[i])) {
sb.append("*");
} else {
sb.append(args[i]);
}
}
sb.append(prefixValue);
return MD5.getMD5(sb.toString());

}
}


6. MD5的实现类,见上文

7. 我做列子用的业务表,mysql数据库,见上文

8. 实体bean,见上文

9. 接口(这里我偷懒了,和上文使用的是同一个接口文件,用不到的自己过滤下吧,呵呵)

package com.dsideal.sys.service;

import java.util.List;

import com.dsideal.sys.bean.CacheLog;
import com.dsideal.sys.bean.SysLoginPersonBean;

public interface ICacheLogService {

/**
* <p>功能:增加memcached数据文件到临时表中</p>
* @author 周枫
* @date 2013-4-9
* @param
* @return void
*/
public void add(CacheLog log);

/**
* <p>功能:查询以prefix为前缀的所有key值,在更新删除时使用此方法</p>
* @author 周枫
* @date 2013-4-9
* @param
* @return List<CacheLog>
*/
public List<CacheLog> findListByPrefix(String prefix);

/**
* <p>功能:删除操作时,aop拦截</p>
* @author 周枫
* @date 2013-4-9
* @param
* @return void
*/
public void memcacheDeleteByPrefix();

/**
* <p>功能:删除临时表记录的数据</p>
* @author 周枫
* @date 2013-4-9
* @param
* @return int
*/
public int deleteByPrefix(String prefix);

/**
* <p>功能:查找例子,查找所有人员数据,后面的person_id没有使用,只是为了测试key值的生成策略</p>
* @author 周枫
* @date 2013-4-9
* @param
* @return List<SysLoginPersonBean>
*/
public List<SysLoginPersonBean> memcacheFindAll(int b_use,String person_id);

/**
* <p>功能:测试方法,可以忽略</p>
* @author 周枫
* @date 2013-4-9
* @param
* @return List<CacheLog>
*/
public List<CacheLog> memcacheCacheLogFindAll();

/**
* <p>功能:修改人员</p>
* @author 周枫
* @date 2013-4-9
* @param
* @return int
*/
public int memcacheupdateSysLoginPersonBean(String prefix,String person_id,String real_name);

/**
* <p>功能:不用数据库临时表更新缓存时修改人员</p>
* @author 周枫
* @date 2013-4-9
* @param
* @return int
*/
public int memcacheUpdateNoSql(String prefix,String person_id,String real_name);

}


10. 接口的实现类,"sys"为业务包名,为key的前缀,expiration:自定义memcached死亡时间,版本号无死亡时间

package com.dsideal.sys.service.impl;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.dsideal.common.Cache;
import com.dsideal.common.CacheUpdate;
import com.dsideal.common.Flush;
import com.dsideal.sys.bean.CacheLog;
import com.dsideal.sys.bean.SysLoginPersonBean;
import com.dsideal.sys.dao.CacheLogDao;
import com.dsideal.sys.service.ICacheLogService;

@Service
public class CacheLogServiceImpl implements ICacheLogService {

@Resource
private CacheLogDao dao;

@Override
public void add(CacheLog log) {
dao.add(log);
}

@Override
public List<CacheLog> findListByPrefix(String prefix) {
// TODO Auto-generated method stub
return dao.findListByPrefix(prefix);
}

@Override
@Flush(prefix="sys")
public void memcacheDeleteByPrefix() {
// TODO Auto-generated method stub
}

@Override
public int deleteByPrefix(String prefix) {
// TODO Auto-generated method stub
return dao.deleteByPrefix(prefix);
}

@Override
@Cache(prefix="sys",expiration=1000*60*60*2)
public List<SysLoginPersonBean> memcacheFindAll(int b_use,String person_id) {
// TODO Auto-generated method stub
return dao.findAll(b_use);
}

@Override
@Cache(prefix="sys",expiration=1000*60*60*2)
public List<CacheLog> memcacheCacheLogFindAll() {
// TODO Auto-generated method stub
return dao.findCacheLogAll();
}

@Override
@Flush(prefix="sys")
public int memcacheupdateSysLoginPersonBean(String prefix,String person_id,String real_name) {
return dao.updateSysLoginPersonBean(person_id,real_name);

}

@Override
@CacheUpdate(prefix="sys")
public int memcacheUpdateNoSql(String prefix,String person_id,String real_name) {
return dao.updateSysLoginPersonBean(person_id,real_name);

}

}


11. dao层

package com.dsideal.sys.dao;

import org.springframework.dao.DataAccessException;
import org.springframework.stereotype.Repository;

import java.util.Date;
import java.util.List;

import com.dsideal.common.BaseDao;
import com.dsideal.common.Utils.RSMapper;
import com.dsideal.sys.bean.CacheLog;
import com.dsideal.sys.bean.SysLoginPersonBean;

@Repository
public class CacheLogDao extends BaseDao {
public void add(CacheLog log) {
try {
String sql = "INSERT INTO t_cache_log(prefix,cache_key,add_time) VALUES (?,?,?)";
int result = 0;
Date now = new Date();
result = this.jdbcTemplate.update(sql, log.getPrefix(),log.getCache_key(),now);
System.out.println("增加成功");
} catch (DataAccessException e) {
e.printStackTrace();
System.out.println("增加报错");
}
}

public int deleteByPrefix(String prefix) {
try {
String sql = "DELETE FROM t_cache_log WHERE prefix = ?";
int result = 0;
result = this.jdbcTemplate.update(sql, prefix);
return result;
} catch (DataAccessException e) {
e.printStackTrace();
}
return 0;
}

public List<CacheLog> findListByPrefix(String prefix) {
try {
String sql = "SELECT * FROM t_cache_log WHERE prefix = ?";
return RSMapper.queryList(jdbcTemplate, sql, CacheLog.class, prefix);
} catch (DataAccessException e) {
e.printStackTrace();
}
return null;
}

public List<SysLoginPersonBean> findAll(int b_use) {
try {
String sql = "SELECT * FROM t_sys_loginperson WHERE b_use = ?";
return RSMapper.queryList(jdbcTemplate, sql, SysLoginPersonBean.class,b_use);
} catch (DataAccessException e) {
e.printStackTrace();
}
return null;
}

public List<CacheLog> findCacheLogAll() {
try {
String sql = "SELECT * FROM t_cache_log";
return RSMapper.queryList(jdbcTemplate, sql, CacheLog.class);
} catch (DataAccessException e) {
e.printStackTrace();
}
return null;
}

public int updateSysLoginPersonBean(String person_id,String real_name) {
int result = 0;
try {
String sql = "UPDATE t_sys_loginperson SET real_name = ? WHERE person_id = ?";

return this.jdbcTemplate.update(sql, real_name,person_id);
} catch (DataAccessException e) {
e.printStackTrace();
System.out.println("修改时报错");
}
return result;
}
}


12. Service测试类

package com.dsideal.sys.test;

import java.util.List;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.dsideal.sys.bean.CacheLog;
import com.dsideal.sys.bean.SysLoginPersonBean;
import com.dsideal.sys.service.ICacheLogService;
import com.dsideal.sys.service.impl.CacheLogServiceImpl;

@RunWith(SpringJUnit4ClassRunner.class)
//指定Spring的配置文件 /为classpath下
@ContextConfiguration(locations = {"/spring-mvc.xml"})
public class CacheLogServiceTest {

@Autowired
private ICacheLogService impl;

@Before //在每个测试用例方法之前都会执行
public void init(){

}

@After //在每个测试用例执行完之后执行
public void destory(){

}

@Test
public void add() {
CacheLog log = new CacheLog();
impl.add(log);
}

@Test
public void findAll() {
int b_use = 1;
String person_id = "";
List<SysLoginPersonBean> list = impl.memcacheFindAll(b_use,person_id);
for (int i = 0; i < list.size(); i++) {
System.out.println(list.get(i).getReal_name());
}

}

@Test
public void deleteByPrefix() {
System.out.println("1");
impl.memcacheDeleteByPrefix();
System.out.println("删除成功");
}

@Test
public void findCacheLogAll() {
List<CacheLog> list = impl.memcacheCacheLogFindAll();
for (int i = 0; i < list.size(); i++) {
System.out.println(list.get(i).getCache_key());
}

}

@Test
public void updateToDeleteToFind() {
String prefix = "sys";
String person_id1 = "0E04DE60-7264-4FE7-9A6C-5AB843B603CC";
String person_id2 = "";
String real_name = "初中历史管理员1";
int result = impl.memcacheupdateSysLoginPersonBean(prefix, person_id1, real_name);
if (result > 0) {
System.out.println("修改成功");
}

int b_use = 1;
List<SysLoginPersonBean> list = impl.memcacheFindAll(b_use,person_id2);
System.out.println("查询成功");
for (int i = 0; i < list.size(); i++) {
System.out.println(list.get(i).getReal_name());
}
}

@Test
public void updateNoSqlToDeleteToFind() {
String prefix = "sys";
String person_id1 = "0E04DE60-7264-4FE7-9A6C-5AB843B603CC";
String person_id2 = "";
String real_name = "初中历史管理员2";
int result = impl.memcacheUpdateNoSql(prefix, person_id1, real_name);
if (result > 0) {
System.out.println("修改成功");
}
int b_use = 1;
List<SysLoginPersonBean> list = impl.memcacheFindAll(b_use,person_id2);
System.out.println("查询成功");
for (int i = 0; i < list.size(); i++) {
System.out.println(list.get(i).getReal_name());
}
}
}


具体测试方法同上文

转载地址: http://www.cnblogs.com/cczhoufeng/archive/2013/04/10/3011648.html
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