java memcachedclient_memcached client — memcached client for java使用 | 学步园
memcached client for java是另一個memcached的java客戶端
代碼：
(1)MemcachedServer -- memcached的服務器
public class MemcachedServer {
private String address;
private int port;
private int weight;
public MemcachedServer(String address, int port, int weight) {
this.address = address;
this.port = port;
this.weight = weight;
}
public String getAddress() {
return address;
}
public int getPort() {
return port;
}
public int getWeight() {
return weight;
}
public String toString() {
return address + ":" + port + "," + weight;
}
}
(2)MemcachedException
@SuppressWarnings("serial")
public class MemcachedException extends Exception {
public MemcachedException() {
super();
}
public MemcachedException(Throwable t) {
super(t);
}
public MemcachedException(String error) {
super(error);
}
public MemcachedException(String error, Throwable t) {
super(error, t);
}
}
(3)PoolDefaultProperties? --? memcached池初始化參數
import java.util.Properties;
public class PoolDefaultProperties extends Properties {
private static final long serialVersionUID = -7630655479181446040L;
public PoolDefaultProperties() {
super();
initDefault();
}
private void initDefault() {
initConn();
initMainSleep();
initTCP();
initFailover();
initAliveCheck();
}
protected void initConn() {
setProperty("initConn", "10");
setProperty("minConn", "10");
setProperty("maxConn", "20");
setProperty("maxIdle", String.valueOf(1000 * 60 * 30));
}
protected void initMainSleep() {
setProperty("maintSleep", String.valueOf(1000 * 5));
}
protected void initTCP() {
setProperty("nagle", "false");
setProperty("socketTO", String.valueOf(1000 * 3));
setProperty("socketConnectTO", String.valueOf(1000 * 3));
}
protected void initFailover() {
setProperty("failover", "true");
setProperty("failback", "true");
}
protected void initAliveCheck() {
setProperty("aliveCheck", "true");
}
}
(4)MemcachedPool? --? memcached池
import java.lang.reflect.InvocationTargetException;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import java.util.Set;
import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.danga.MemCached.SockIOPool;
public class MemcachedPool {
private static final Log logger = LogFactory.getLog(MemcachedPool.class);
private static Properties POOL_DEFAULT_VALUE = new PoolDefaultProperties();
private static MemcachedPool pool = new MemcachedPool();
private MemcachedPool() {}
public static MemcachedPool getInstance() {
return pool;
}
public void initPool(List servers) throws MemcachedException {
initPool(servers, POOL_DEFAULT_VALUE);
}
public void initPool(List servers, Properties props) throws MemcachedException {
SockIOPool sockIOPool = SockIOPool.getInstance();
//server & weight
sockIOPool.setServers(getServer(servers));
sockIOPool.setWeights(getWeight(servers));
//bean props
Set keys = props.keySet();
Iterator keyIter = keys.iterator();
while (keyIter.hasNext()) {
String key = (String)keyIter.next();
String value = props.getProperty(key);
if (value == null) {
value = POOL_DEFAULT_VALUE.getProperty(key);
}
try {
Class type = PropertyUtils.getPropertyType(sockIOPool, key);
logger.debug("Type=" + type + ";Key=" + key + ";Value=" + value);
Object val = ConvertUtils.convert(value, type);
PropertyUtils.setSimpleProperty(sockIOPool, key, val);
} catch (IllegalAccessException e) {
throw new MemcachedException("Init Pool Fail", e);
} catch (InvocationTargetException e) {
throw new MemcachedException("Init Pool Fail", e);
} catch (NoSuchMethodException e) {
throw new MemcachedException("Init Pool Fail", e);
}
}
sockIOPool.initialize();
}
private Integer[] getWeight(List weigths) {
Integer[] w = new Integer[weigths.size()];
for (int i = 0; i < weigths.size(); i++) {
w[i] = weigths.get(i).getWeight();
}
return w;
}
private String[] getServer(List servers) {
String[] s = new String[servers.size()];
for (int i = 0; i < servers.size(); i++) {
MemcachedServer server = servers.get(i);
s[i] = server.getAddress() + ":" + server.getPort();
}
return s;
}
}
(5)MemcachedCli -- memcached操作客戶端(只有set,get方法)
import java.util.Date;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import com.danga.MemCached.MemCachedClient;
public class MemcachedCli {
private static MemcachedCli unique = new MemcachedCli();
private MemcachedCli() {
init();
}
public static MemcachedCli getInstance() {
return unique;
}
private MemCachedClient client = new MemCachedClient();
private void init() {
client.setPrimitiveAsString(true);
client.setCompressEnable(true);
client.setCompressThreshold(4 * 1024);
}
public boolean set(String key, Object value) {
return client.set(key, value);
}
public boolean set(String key, Object value, Date expired) {
return client.set(key, value, expired);
}
public Object get(String key) {
return client.get(key);
}
public void printStat() {
Map stats = client.stats();
Set keys = stats.keySet();
Iterator keyIter = keys.iterator();
while (keyIter.hasNext()) {
String key = (String)keyIter.next();
Object value = stats.get(key);
System.out.println(key + "=" + value);
}
}
}
(6)MCTest -- 簡單測試
import java.util.ArrayList;
import java.util.List;
public class MCTest {
public static void main(String[] args) {
try {
MemcachedServer server = new MemcachedServer("localhost", 11211, 1);
List servers = new ArrayList();
servers.add(server);
MemcachedPool pool = MemcachedPool.getInstance();
pool.initPool(servers);
MemcachedCli client = MemcachedCli.getInstance();
String value = (String)client.get("test1");
System.out.println("value=" + value);
client.set("test1", "value1");
value = (String)client.get("test1");
System.out.println("value=" + value);
client.printStat();
} catch (MemcachedException e) {
e.printStackTrace();
}
}
}
測試運行結果，其中有memcached client包的調試信息：
com.danga.MemCached.MemCachedClient Sun Nov 29 00:23:54 CST 2009 - ++++ retrieving object and stuffing into a string.
value=value1
com.danga.MemCached.MemCachedClient Sun Nov 29 00:23:54 CST 2009 - ++++ storing data as a string for key: test1 for class: java.lang.String
com.danga.MemCached.MemCachedClient Sun Nov 29 00:23:54 CST 2009 - ++++ memcache cmd (result code): set test1 0 0 6
(STORED)
com.danga.MemCached.MemCachedClient Sun Nov 29 00:23:54 CST 2009 - ++++ data successfully stored for key: test1
com.danga.MemCached.MemCachedClient Sun Nov 29 00:23:54 CST 2009 - ++++ retrieving object and stuffing into a string.
value=value1
localhost:11211={bytes_written=587, connection_structures=11, bytes=52, total_items=2, total_connections=21, uptime=284045336, pid=1416, get_hits=3, curr_items=1, version=1.2.1, cmd_get=4, time=1259425433, pointer_size=32, cmd_set=2, limit_maxbytes=67108864, bytes_read=162, curr_connections=10, get_misses=1}
總結
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