How to distribute Spring Beans by using Coherence

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转载自：

         http://www.onlinetechvision.com/?p=425         

          This article shows how to distribute Spring beans by using Coherence. In below sample application, a new cluster named OTV has been created and a spring bean has been distributed by using a cache object named user-map. It has been distributed between two members of the cluster.

Used Technologies :

JDK 1.6.0_21
Spring 3.0.5
Maven 3.0.2
Coherence 3.7.0
SolarisOS 5.10

STEP 1 : CREATE MAVEN PROJECT

A maven project is created as below. (It can be created by using Maven or IDE Plug-in).

STEP 2 : DOWNLOAD COHERENCE PACKAGE

Coherence package is downloaded via http://www.oracle.com/technetwork/middleware/coherence/downloads/index.html

STEP 3 : LIBRARIES

Firstly, Spring dependencies are added to Maven’ s pom.xml.

< dependency >
    < groupId >org.springframework groupId >
    < artifactId >spring-core artifactId >
    < version >${spring.version} version >
dependency >
    < dependency >
    < groupId >org.springframework groupId >
    < artifactId >spring-context artifactId >
    < version >${spring.version} version >
dependency >

Coherence library is installed to Local Maven Repository and its description is added to pom.xml as below. Also if maven is not used, coherence.jar file can be added to classpath.

< dependency >
    < groupId >com.tangosol groupId >
    < artifactId >coherence artifactId >
    < version >3.7.0 version >
dependency >

For creating runnable-jar, below plugin can be used.

< plugin >
    < groupId >org.apache.maven.plugins groupId >
    < artifactId >maven-shade-plugin artifactId >
    < version >1.3.1 version >

    < executions >
        < execution >
            < phase >package phase >
            < goals >
                < goal >shade goal >
            goals >
            < configuration >
                < transformers >
                    < transformer
                        implementation = "org.apache.maven.plugins.shade.resource.ManifestResourceTransformer" >
                        < mainClass >com.otv.exe.Application mainClass >
                    transformer >
                    < transformer
                        implementation = "org.apache.maven.plugins.shade.resource.AppendingTransformer" >
                        < resource >META-INF/spring.handlers resource >
                    transformer >
                    < transformer
                        implementation = "org.apache.maven.plugins.shade.resource.AppendingTransformer" >
                        < resource >META-INF/spring.schemas resource >
                    transformer >
                transformers >
            configuration >
        execution >
    executions >
plugin >

STEP 4 : CREATE otv-coherence-cache-config.xml

otv-coherence-cache-config.xml contains caching-schemes(distributed or replicated) and caching-scheme-mapping configuration. Created cache configuration should be added to coherence-cache-config.xml.

xml version = "1.0" ?>

< cache-config xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
    xmlns = "http://xmlns.oracle.com/coherence/coherence-cache-config"
    xsi:schemaLocation="http://xmlns.oracle.com/coherence/coherence-cache-config
   coherence-cache-config.xsd">

    < caching-scheme-mapping >
        < cache-mapping >
            < cache-name >user-map cache-name >
            < scheme-name >MapDistCache scheme-name >
        cache-mapping >
    caching-scheme-mapping >

    < caching-schemes >
        < distributed-scheme >
            < scheme-name >MapDistCache scheme-name >
            < service-name >MapDistCache service-name >
            < backing-map-scheme >
                < local-scheme >
                    < unit-calculator >BINARY unit-calculator >
                local-scheme >
            backing-map-scheme >
            < autostart >true autostart >
        distributed-scheme >
    caching-schemes >
cache-config >

STEP 5 : CREATE tangosol-coherence-override.xml

tangosol-coherence-override.xml contains cluster, member-identity and configurable-cache-factory configuration. Also below configuration xml file show first member of the cluster.

tangosol-coherence-override.xml for first member of the cluster :

xml version = '1.0' ?>

< coherence xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
   xmlns = "http://xmlns.oracle.com/coherence/coherence-operational-config"
   xsi:schemaLocation = "http://xmlns.oracle.com/coherence/coherence-operational-config coherence-operational-config.xsd" >

   < cluster-config >

      < member-identity >
         < cluster-name >OTV cluster-name >

         < role-name >OTV1 role-name >
      member-identity >

      < unicast-listener >
          < well-known-addresses >
            < socket-address id = "1" >

              < address >x.x.x.x address >
              < port >8089 port >
            socket-address >
            < socket-address id = "2" >

              < address >y.y.y.y address >
              < port >8089 port >
            socket-address >
          well-known-addresses >


          < machine-id >OTV1 machine-id >

              < address >x.x.x.x address >
              < port >8089 port >
              < port-auto-adjust >true port-auto-adjust >
      unicast-listener >
   cluster-config >

   < configurable-cache-factory-config >
      < init-params >
         < init-param >
            < param-type >java.lang.String param-type >
            < param-value system-property = "tangosol.coherence.cacheconfig" >
              otv-coherence-cache-config.xml
        param-value >
         init-param >
      init-params >
   configurable-cache-factory-config >

coherence >

tangosol-coherence-override.xml for second member of the cluster :

xml version = '1.0' ?>

< coherence xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
   xmlns = "http://xmlns.oracle.com/coherence/coherence-operational-config"
   xsi:schemaLocation = "http://xmlns.oracle.com/coherence/coherence-operational-config coherence-operational-config.xsd" >

   < cluster-config >

      < member-identity >
         < cluster-name >OTV cluster-name >

         < role-name >OTV2 role-name >
      member-identity >

      < unicast-listener >

          < well-known-addresses >
            < socket-address id = "1" >

              < address >x.x.x.x address >
              < port >8089 port >
            socket-address >
            < socket-address id = "2" >

              < address >y.y.y.y address >
              < port >8089 port >
            socket-address >
          well-known-addresses >


          < machine-id >OTV2 machine-id >

              < address >y.y.y.y address >
              < port >8089 port >
              < port-auto-adjust >true port-auto-adjust >
       unicast-listener >
   cluster-config >

   < configurable-cache-factory-config >
      < init-params >
         < init-param >
            < param-type >java.lang.String param-type >
            < param-value system-property = "tangosol.coherence.cacheconfig" >
              otv-coherence-cache-config.xml param-value >
         init-param >
      init-params >
   configurable-cache-factory-config >
coherence >

STEP 6 : CREATE applicationContext.xml

applicationContext.xml is created.

< beans xmlns = "http://www.springframework.org/schema/beans"
    xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">


    < bean id = "User" class = "com.otv.user.User" > bean >
        < bean id = "CacheService" class = "com.otv.srv.CacheService" > bean >
        < bean id = "CacheUpdater" class = "com.otv.exe.CacheUpdater" >
           < property name = "user" ref = "User" />
       < property name = "cacheService" ref = "CacheService" />
        bean >
beans >

STEP 7 : CREATE SPRING BEAN

A new User Spring bean is created. This bean will be distributed between two node in OTV cluster. For serializing,java.io.Serializable interface has been implemented but PortableObject can be implemented for better performance.

package com.otv.user;

import java.io.Serializable;

/**
 * @author onlinetechvision.com
 * @since 15 Oct 2011
 * @version 1.0.0
 *
 */
public class User implements Serializable {

    private static final long serialVersionUID = 1L;
    private String name;
    private String surname;

    public User(String name, String surname) {
        this .name = name;
        this .surname = surname;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this .name = name;
    }

    public String getSurname() {
        return surname;
    }

    public void setSurname(String surname) {
        this .surname = surname;
    }

    @Override
    public String toString() {
        StringBuffer strBuff = new StringBuffer();
        strBuff.append( "name : " ).append(name);
        strBuff.append( ", surname : " ).append(surname);
        return strBuff.toString();
    }
}

STEP 8 : CREATE ICacheService INTERFACE

A new ICacheService Interface is created for service layer.

package com.otv.srv;

import com.tangosol.net.NamedCache;

public interface ICacheService {

    public NamedCache getCache();
    public void addToCache(Object key, Object value);
    public void deleteFromCache(Object key);

}

STEP 9 : CREATE CacheService

CacheService is created for service layer by implementing ICacheService.

package com.otv.srv;

import org.apache.log4j.Logger;

import com.otv.listener.UserMapListener;
import com.tangosol.net.CacheFactory;
import com.tangosol.net.NamedCache;

/**
 * @author onlinetechvision.com
 * @since 15 Oct 2011