MyBatis的集成与Memcache
MyBatis 本身不直接支持与 Memcached 的集成,但你可以通过自定义拦截器来实现缓存的功能。以下是一个简单的例子,展示了如何在 MyBatis 中使用自定义拦截器来集成 Memcached 作为二级缓存的解决方案。
- 添加 Memcached 客户端依赖(例如使用 XMemcached)。
<dependency>
<groupId>com.googlecode.xmemcached</groupId>
<artifactId>xmemcached</artifactId>
<version>2.4.7</version>
</dependency>
- 创建 Memcached 工具类。
import net.rubyeye.xmemcached.MemcachedClient;
import net.rubyeye.xmemcached.MemcachedClientBuilder;
import net.rubyeye.xmemcached.XMemcachedClientBuilder;
import net.rubyeye.xmemcached.utils.AddrUtil;
public class MemcachedClientUtil {
private static MemcachedClient memcachedClient;
static {
try {
MemcachedClientBuilder builder = new XMemcachedClientBuilder(AddrUtil.getAddrs("server1:11211 server2:11211"));
memcachedClient = builder.build();
} catch (IOException e) {
e.printStackTrace();
}
}
public static MemcachedClient getMemcachedClient() {
return memcachedClient;
}
}
- 创建 MyBatis 拦截器。
import org.apache.ibatis.cache.CacheKey;
import org.apache.ibatis.executor.resultset.ResultSetHandler;
import org.apache.ibatis.plugin.*;
import java.util.List;
import java.util.Properties;
@Intercepts({
@Signature(type = ResultSetHandler.class, method = "handleResultSets", args = {java.sql.Statement.class})
})
public class MemcachedInterceptor implements Interceptor {
private MemcachedClient memcachedClient;
@Override
public Object intercept(Invocation invocation) throws Throwable {
// 获取查询的Mapper方法和参数
// 生成Memcached的key
String key = generateKey(invocation);
// 尝试从Memcached中获取缓存的结果
Object result = memcachedClient.get(key);
if (result != null) {
// 如果缓存命中,直接返回缓存的结果
return result;
} else {
// 如果缓存未命中,执行查询并将结果存储到Memcached中
result = invocation.proceed();
memcachedClient.set(key, 0, result);
return result;
}
}
private String generateKey(Invocation invocation) {
// 根据Mapper方法、参数等信息生成key
// 这里简化为一个示例
return invocation.getMethod().getName();
}
@Override
public Object plugin(Object target) {
return Plugin.wra
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