這三種Client一直存在各種爭議:
- Memcached Client for Java 比 SpyMemcached更穩定、更早、更廣泛;
- SpyMemcached 比 Memcached Client for Java更高效;
- XMemcached 比 SpyMemcache併發效果更好。
用數據來說話,參考官方性能對比:
Memcached Client for Java:https://github.com/gwhalin/Memcached-Java-Client/wiki/PERFORMANCE
XMemcached:http://xmemcached.googlecode.com/svn/trunk/benchmark/benchmark.html
二、XMemcached特性
XMemcached特性:
- 高性能
- 支持完整的memcached文本協議,二進制協議。
- 支持JMX,可以通過MBean調整性能參數、動態添加/移除server、查看統計等。
- 支持客戶端統計
- 支持memcached節點的動態增減。
- 支持memcached分佈:餘數分佈和一致性哈希分佈。
- 更多的性能調整選項。
此外,XMemcached更容易與Spring集成。而且,屬於中國原創!
三、XMemcached簡單實現
MemcachedClientBuilder是MemcachedClient核心接口,用來控制Client的構建(build()方法)和關閉(shutdown()方法)。
XMemcachedClientBuilder一般通過構造方法配置地址列表,通常還要配置權重,代碼如下:
- public XMemcachedClientBuilder(List<InetSocketAddress> addressList) {
- if (addressList != null) {
- for (InetSocketAddress addr : addressList) {
- this.addressMap.put(addr, null);
- }
- }
- }
- public XMemcachedClientBuilder(List<InetSocketAddress> addressList,
- int[] weights) {
- if (addressList != null) {
- for (InetSocketAddress addr : addressList) {
- this.addressMap.put(addr, null);
- }
- }
- this.weights = weights;
- }
不過這哥們如果用this()可以省點代碼, 還有給加點註釋吧!
此外,還需要設置連接池大小,使用二進制協議/文本協議等。
通過build()方法獲得MemcachedClient
然後就可以通過Memcached進行set、get、replace、delete等Memcached操作了!
上代碼:
- import static junit.framework.Assert.*;
- import java.io.IOException;
- import java.util.concurrent.TimeoutException;
- import net.rubyeye.xmemcached.MemcachedClient;
- import net.rubyeye.xmemcached.MemcachedClientBuilder;
- import net.rubyeye.xmemcached.XMemcachedClientBuilder;
- import net.rubyeye.xmemcached.command.BinaryCommandFactory;
- import net.rubyeye.xmemcached.exception.MemcachedException;
- import net.rubyeye.xmemcached.utils.AddrUtil;
- import org.junit.Test;
- public class MemcachedClientTest {
- @Test
- public void test() {
- MemcachedClientBuilder builder = new XMemcachedClientBuilder(
- AddrUtil.getAddresses("10.11.155.26:11211 10.11.155.41:11211 10.10.76.31:11211 10.10.76.35:11211"),
- new int[] { 1, 1, 1, 1 });
- // 設置連接池大小,即客戶端個數
- builder.setConnectionPoolSize(50);
- // 宕機報警
- builder.setFailureMode(true);
- // 使用二進制文件
- builder.setCommandFactory(new BinaryCommandFactory());
- MemcachedClient memcachedClient = null;
- try {
- memcachedClient = builder.build();
- try {
- // 設置/獲取
- memcachedClient.set("zlex", 36000, "set/get");
- assertEquals("set/get", memcachedClient.get("zlex"));
- // 替換
- memcachedClient.replace("zlex", 36000, "replace");
- assertEquals("replace", memcachedClient.get("zlex"));
- // 移除
- memcachedClient.delete("zlex");
- assertNull(memcachedClient.get("zlex"));
- } catch (TimeoutException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- } catch (InterruptedException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- } catch (MemcachedException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- } catch (IOException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- } finally {
- if (memcachedClient != null) {
- try {
- memcachedClient.shutdown();
- } catch (IOException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- }
- }
- }
- }
四、XMemcached與Spring集成
XMemcached與Spring集成可以參考http://code.google.com/p/xmemcached/wiki/Spring_Integration,這裏只說最常用的方法。
memcached.properties做基本配置:
- #連接池大小即客戶端個數
- memcached.connectionPoolSize=50
- memcached.failureMode=true
- #server1
- memcached.server1.host=10.11.155.26
- memcached.server1.port=11211
- memcached.server1.weight=4
- #server2
- memcached.server2.host=10.11.155.41
- memcached.server2.port=11211
- memcached.server2.weight=3
- #server3
- memcached.server3.host=10.10.76.31
- memcached.server3.port=11211
- memcached.server3.weight=2
- #server4
- memcached.server4.host=10.10.76.35
- memcached.server4.port=11211
- memcached.server4.weight=1
XML配置文件:
- <?xml version="1.0" encoding="UTF-8"?>
- <beans
- xmlns="http://www.springframework.org/schema/beans"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xmlns:context="http://www.springframework.org/schema/context"
- xmlns:p="http://www.springframework.org/schema/p"
- xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
- http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
- <!-- http://code.google.com/p/xmemcached/wiki/Spring_Integration -->
- <context:property-placeholder location="memcached.properties" />
- <bean
- id="memcachedClientBuilder"
- class="net.rubyeye.xmemcached.XMemcachedClientBuilder"
- p:connectionPoolSize="${memcached.connectionPoolSize}"
- p:failureMode="${memcached.failureMode}">
- <!-- XMemcachedClientBuilder have two arguments.First is server list,and
- second is weights array. -->
- <constructor-arg>
- <list>
- <bean class="java.net.InetSocketAddress">
- <constructor-arg>
- <value>${memcached.server1.host}</value>
- </constructor-arg>
- <constructor-arg>
- <value>${memcached.server1.port}</value>
- </constructor-arg>
- </bean>
- <bean class="java.net.InetSocketAddress">
- <constructor-arg>
- <value>${memcached.server2.host}</value>
- </constructor-arg>
- <constructor-arg>
- <value>${memcached.server2.port}</value>
- </constructor-arg>
- </bean>
- <bean class="java.net.InetSocketAddress">
- <constructor-arg>
- <value>${memcached.server3.host}</value>
- </constructor-arg>
- <constructor-arg>
- <value>${memcached.server3.port}</value>
- </constructor-arg>
- </bean>
- <bean class="java.net.InetSocketAddress">
- <constructor-arg>
- <value>${memcached.server4.host}</value>
- </constructor-arg>
- <constructor-arg>
- <value>${memcached.server4.port}</value>
- </constructor-arg>
- </bean>
- </list>
- </constructor-arg>
- <constructor-arg>
- <list>
- <value>${memcached.server1.weight}</value>
- <value>${memcached.server2.weight}</value>
- <value>${memcached.server3.weight}</value>
- <value>${memcached.server4.weight}</value>
- </list>
- </constructor-arg>
- <property name="commandFactory">
- <bean class="net.rubyeye.xmemcached.command.TextCommandFactory" />
- </property>
- <property name="sessionLocator">
- <bean class="net.rubyeye.xmemcached.impl.KetamaMemcachedSessionLocator" />
- </property>
- <property name="transcoder">
- <bean class="net.rubyeye.xmemcached.transcoders.SerializingTranscoder" />
- </property>
- </bean>
- <!-- Use factory bean to build memcached client -->
- <bean
- id="memcachedClient"
- factory-bean="memcachedClientBuilder"
- factory-method="build"
- destroy-method="shutdown" />
- </beans>
這裏的memcachedClientBuilder節點完成MemcachedClientBuilder,然後通過memcachedClient節點配置factory-method,調用MemcachedClientBuilder的build()方法產生MemcachedClient,並配置destroy-method進行關閉。
不過我還是疑惑,這裏的異常由誰來處理?Spring容器嗎? 或者需要另一個代理Bean包裝一下?
有了Spring容器支持,我們不需要在代碼中進行配置,也不需要重複調用build()跟shutdown()方法,這些操作交給Spring來完成。
代碼如下:
- import static junit.framework.Assert.*;
- import java.util.concurrent.TimeoutException;
- import net.rubyeye.xmemcached.MemcachedClient;
- import net.rubyeye.xmemcached.exception.MemcachedException;
- import org.junit.Before;
- import org.junit.Test;
- import org.springframework.context.ApplicationContext;
- import org.springframework.context.support.ClassPathXmlApplicationContext;
- public class MemcachedSpringTest {
- private ApplicationContext app;
- private MemcachedClient memcachedClient;
- @Before
- public void init() {
- app = new ClassPathXmlApplicationContext("applicationContext.xml");
- memcachedClient = (MemcachedClient) app.getBean("memcachedClient");
- }
- @Test
- public void test() {
- try {
- // 設置/獲取
- memcachedClient.set("zlex", 36000, "set/get");
- assertEquals("set/get", memcachedClient.get("zlex"));
- // 替換
- memcachedClient.replace("zlex", 36000, "replace");
- assertEquals("replace", memcachedClient.get("zlex"));
- // 移除
- memcachedClient.delete("zlex");
- assertNull(memcachedClient.get("zlex"));
- } catch (TimeoutException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- } catch (InterruptedException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- } catch (MemcachedException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- }
- }