CentOS installation memcached and Java operating examples

Prepare to build a memcached cache cluster. Here's a simple record of the building process.

Since the memcached installation requires the use of the Libevent class library, the Libevent is installed first http://www.monkey.org/~provos/libevent/

(a) I downloaded the libevent-1.4.14b-stable.tar.gz

2| entering the file

CD libevent-1.4.14b-stable

3. Compile the installation ( install to/usr/local/lib/directory by default）

./configure Make make Install

(ii) Installation of memcached

Installing memcached
memcached Download URL: http://www.danga.com/memcached/download.bml

1. Unzip the tar XZFV memcached-1.2.6.tar.gz 2. Go to memcached-1.2.6 directory CD memcached-1.2.6    3. Compile, install    ./configure--prefix=/local/memcached    make    make Install

This may prompt you for permission issues when you install it, so first

chmod +x Configure

After the installation is complete, the bin and share directories will appear in the/local/memcached

Make Bin directory, start memcache
Here's how:
./memcached-d-U nobody-m 127.0.0.1-p 11211
At this point, an exception is reported
error while loading shared Libraries:libevent-1.4.so.2:cannot open Shared object file:no such file or DIRECTORY

The reason is that the Libevent-1.4.so.2 class library is not found and the workaround is as follows:

Use Ld_debug=help./memcached-v to determine which class library path to load by using the following method:
Ld_debug=libs./memcached-v 2>&1 >/dev/null | Less

The system will display:

Linux:/local/memcached/bin # ld_debug=libs./memcached-v 2>&1 >/dev/null | Less 20421:find library=libevent-1.4.so.2; Searching 20421:search Cache=/etc/ld.so.cache 20421:search path=/lib/tls/i686/sse2:/lib/tls/i686:/lib/ tls/sse2:/lib/tls:/lib/i686/sse2:/lib/i686:/lib/sse2:/lib:/usr/lib/tls/i686/sse2:/usr/lib/tls/i686:/usr/lib/       Tls/sse2:/usr/lib/tls:/usr/lib/i686/sse2:/usr/lib/i686:/usr/lib/sse2:/usr/lib (System search path) 20421: Trying file=/lib/tls/i686/sse2/libevent-1.4.so.2 20421:trying file=/lib/tls/i686/libevent-1.4.so.2 20421       : Trying file=/lib/tls/sse2/libevent-1.4.so.2 20421:trying file=/lib/tls/libevent-1.4.so.2 20421:       Trying file=/lib/i686/sse2/libevent-1.4.so.2 20421:trying file=/lib/i686/libevent-1.4.so.2 20421: Trying file=/lib/sse2/libevent-1.4.so.2 20421:trying file=/lib/libevent-1.4.so.2 20421:trying file=/ Usr/lib/tls/i686/sse2/libevent-1.4.so.2 20421:trying file=/usr/lib/tls/i686/libevent-1.4.so.2 20421:trying file=/usr/lib/ Tls/sse2/libevent-1.4.so.2 20421:trying file=/usr/lib/tls/libevent-1.4.so.2 20421:trying file=/usr/l Ib/i686/sse2/libevent-1.4.so.2 20421:trying file=/usr/lib/i686/libevent-1.4.so.2 20421:trying file=/ Usr/lib/sse2/libevent-1.4.so.2 20421:trying file=/usr/lib/libevent-1.4.so.2 20421:./memcached:error WH Ile loading shared Libraries:libevent-1.4.so.2:cannot Open Shared object file:no such file or directory

We see, memcached will go to a lot of places to find, so according to other request, we just need to build a soft link, designated to our installed class library can be as follows: Ln-s/usr/local/lib/libevent-1.4.so.2/lib/ Libevent-1.4.so.2 can now start memcached normally./memcached-d-u nobody-m 127.0.0.1-p 11211

memcache Start parameter description:
The installation is ready to use memcached, and below I use the simplest official method Java_memcached_releas

can go here to download https://github.com/gwhalin/Memcached-Java-Client/downloads

Tool class

Package Org.memcached.xiezhaodong.test;import Java.util.date;import Com.danga.memcached.memcachedclient;import com.danga.memcached.sockiopool;/** * * <pre><b> Function Description: </b>memcached Tool class * * @author Xie) <br> * * & lt;b> Modify History:</b> (modify person, modify time, change reason/content) * * </pre> */public Final class Memcachedutil {/** * <b> Constructors: Tool class, Disallow instantiation </b> * */Private Memcachedutil () {}//create unique instance of global private static MEMCACHEDCL        Ient MCC = new Memcachedclient ();        /** * Self instance */private static Memcachedutil Memcachedutil = new Memcachedutil (); Set the connection pool with the cache server static {//server list and its weight string[] servers = {"192.168.80.100:11211"};//IP address and port number//                Weight integer[] weights = {3};                Gets the instance object of the socket connection pool Sockiopool pool = sockiopool.getinstance ();        Set Server information pool.setservers (servers);                Pool.setweights (weights);      Set the number of initial connections, minimum and maximum connections, and maximum processing time  Pool.setinitconn (5);        Pool.setminconn (5);        Pool.setmaxconn (250);                Pool.setmaxidle (1000 * 60 * 60 * 6);                Set the main thread's sleep time Pool.setmaintsleep (30);        Set TCP parameters, connection timeout, etc. pool.setnagle (false);        Pool.setsocketto (3000);                Pool.setsocketconnectto (0);                Initialize the connection pool pool.initialize ();        Compression setting, data that exceeds the specified size (in K) will be compressed//mcc.setcompressenable (TRUE);                Mcc.setcompressthreshold (64 * 1024);     Mcc.setprimitiveasstring (TRUE);//Set Serialization}/** * * <pre><b> function Description:</b> gets a unique instance. * @author: Xiezhaodong * <b> Date Created: </b>2012-4-25 morning 10:57:41 * * @return * * &LT;B&GT Modify history:</b> (modify person, modify time, change reason/content) * * </pre> */public static Memcachedutil getinstance () {R    Eturn Memcachedutil; }/** * * <pre><b> function Description:</b> New CACHE Data * * @author: Xiezhaodong * <b> created: </b>2012-4-25 Morning 10:55:15 * * @param key Cached Key * @param value Cached values * @return operation result * * <b> Modify History:</b> (modify person, modify time, change reason/content) * * </pre> * */public Boolean Add (String key        , Object value) {//will not be cached in return Mcc.add (key, value);    Return Mcc.set (key, value); }/** * * <pre><b> function Description:</b> New CACHE Data * * @author: Xiezhaodong * <b> Creation Date Period: </b>2012-4-25 a.m. 10:56:15 * * @param key Cached Key * @param value Cached values * @param expiry cache Expiration Time * @return Operation Result * * <b> Modify history:</b> (modifier, modified time, reason/content) * * </pre> */public Boolean Add (        String key, Object value, Date expiry) {//will not be cached in return Mcc.add (key, value, expiry);    Return Mcc.set (key, value, expiry); }/** * <pre><b> function Description:</b> Replace existing cache data * * @author: Xiezhaodong * <b> Date Created: &lt ;/b>2012-4-25 Morning 10:55:34 * * @param key to set the object's key * @return object to set the value of the objects * @return if the replacement succeeds * * &LT;B&G        t; Modify history:</b> (modify person, modify time, modify reason/content) * * </pre> * * Public boolean replace (String key, Object value) {    Return Mcc.replace (key, value); }/** * * <pre><b> function Description:</b> Replace existing cache data * * @author: Xiezhaodong * <b> Create     Date: </b>2012-4-25 am 10:43:17 * * @param key to set the object's key * @return object to set the value of objects * @param expiry expiration Time * @return Replace Success * * <b> Modify History:</b> (modify person, modify time, change reason/content) * * </pre> */Public Boolea    N Replace (String key, Object value, Date expiry) {return Mcc.replace (key, value, expiry); /** * * <pre><b> function Description:</b> gets the object according to the specified keyword * * @author: Xiezhaodong * <b&gt ; Date Created: </b>2012-4-25 am 10:42:49 * * @param key gets the object's key * @return Object Object Value * * <b> history: & Lt/b> (modifier, modification time, reason/content) * * </pre> * * Public Object get (String key) {return mcc.get (key); }}

object, you must implement the serialization interface

Package Org.memcached.xiezhaodong.test;import java.io.serializable;/** * * <pre><b> Function Description:</b> employee class, Must be serialized, otherwise the cache operation will be an error * * @author:xiezhaodong<br> * * <b> Modify the history:</b> (modifier, modified time, change reason/content) * * </pre> */p Ublic class Employee implements Serializable {/** * serialversionuid * * Private static final long seria        Lversionuid = -6487397580836471048l;        /** * Employee Name */private String empname;        /** * Department Name */private String deptname;        /** * Company Name * * Private String companyName;  /** * * <b> Constructor:</b> * */Public Employee () {}/** * Access method for the    EmpName Property * * @return The EmpName * */Public String Getempname () {return empname; }/** * Sets the value of EmpName the property * * @param empname the EmpName to set */public    void Setempname (String empname) {empname = EmpName;   }     /** * Access method for the Deptname property * * @return The Deptname */public String Getdeptna    Me () {return deptname; }/** * Sets the value of Deptname the property * * @param deptname the Deptname to set */Publ    IC void Setdeptname (String deptname) {this.deptname = Deptname;  /** * Access method for the CompanyName property * * @return The CompanyName */public String    Getcompanyname () {return companyName; }/** * Sets the value of CompanyName the property * * @param companyName the companyName to set *    /public void Setcompanyname (String companyName) {this.companyname = CompanyName; }}

Test class

Package Org.memcached.xiezhaodong.test;import Com.danga.memcached.memcachedclient;public class MemcachedUtilTest { public static void Main (string[] args) {//add ();p rint ();} private static void print () {Memcachedutil cache = memcachedutil.getinstance (); Employee emp= (employee) cache.get ("emp"); System.out.println ("Name:" +emp.getcompanyname ()); System.out.println ("DEP:" +emp.getdeptname ()); SYSTEM.OUT.PRINTLN ("emp" +emp.getempname ());} private static void Add () {Memcachedutil cache = memcachedutil.getinstance (); Employee EMP = new Employee (), Emp.setcompanyname ("Kevin's Company"), Emp.setdeptname ("R/R Dept"); Emp.setempname (" Kevin "); Cache.Add (" EMP ", EMP);}}

A simple stand-alone environment has been built. There are some other plugins, such as spring integrated memcached plug-ins and so on, you can use it later!

Reprint Please specify http://blog.csdn.net/a837199685

CentOS installation memcached and Java operating examples