memcached-endpoint: Use JDG remotely through MemCached

Author: Tristan Tarrant, Martin Gencur Level: Intermediate Technologies: Infinispan, Memcached Summary: Demonstrates how to use Infinispan remotely using the Memcached protocol. Target Product: JDG

What is it?

Memcached is an in-memory caching system used to improve response and operation times for database-driver websites. JBoss Data Grid offers a server that uses the text based, client-server Memcached protocol, removing the necessity to use Memcached separately with JBoss Data Grid. Additionally, due to JBoss Data Grid's clustering features, its data failover capabilities surpass those provided by Memcached.

This quickstart demonstrates how to connect remotely to JBoss Data Grid (JDG) to store, retrieve, and remove data from cache using the Memcached protocol. It is a simple Football Manager console application allows you to add and remove teams, add players to or remove players from teams, or print a list of the current teams and players using the memcached based connector.

System requirements

All you need to build this project is Java 6.0 (Java SDK 1.6) or better, Maven 3.0 or better.

The application this project produces is designed to be run on JBoss Data Grid 6.0

Configure Maven

If you have not yet done so, you must Configure Maven before testing the quickstarts.

Configure JDG

1. Obtain JDG server distribution on Red Hat's Customer Portal at https://access.redhat.com/jbossnetwork/restricted/listSoftware.html

2. Install a JDBC driver into JDG (since JDG includes H2 by default, this step may be skipped for the scope of this example). More information can be found at https://access.redhat.com/knowledge/docs/en-US/JBoss_Enterprise_Application_Platform/6/html/Administration_and_Configuration_Guide/chap-Datasource_Management.html . NOTE: JDG does not support deploying applications so one cannot install it as a deployment.

3. This Quickstart uses JDBC to store the cache. To permit this, it's necessary to alter JDG configuration file (JDG_HOME/standalone/configuration/standalone.xml) to contain the following definitions:

• Datasource subsystem definition:

    <subsystem xmlns="urn:jboss:domain:datasources:1.0">
        <!-- Define this Datasource with jndi name  java:jboss/datasources/ExampleDS -->
        <datasources>
            <datasource jndi-name="java:jboss/datasources/ExampleDS" pool-name="ExampleDS" enabled="true" use-java-context="true">
                <!-- The connection URL uses H2 Database Engine with in-memory database called test -->
                <connection-url>jdbc:h2:mem:test;DB_CLOSE_DELAY=-1</connection-url>
                <!-- JDBC driver name -->
                <driver>h2</driver>
                <!-- Credentials -->
                <security>
                    <user-name>sa</user-name>
                    <password>sa</password>
                </security>
            </datasource>
            <!-- Define the JDBC driver called 'h2' -->
            <drivers>
                <driver name="h2" module="com.h2database.h2">
                    <xa-datasource-class>org.h2.jdbcx.JdbcDataSource</xa-datasource-class>
                </driver>
            </drivers>
        </datasources>
    </subsystem>
  

• Infinispan subsystem definition:

    <subsystem xmlns="urn:jboss:datagrid:infinispan:6.1" default-cache-container="local">
        <cache-container name="local" default-cache="default">
            <local-cache name="default" start="EAGER">
                <locking isolation="NONE" acquire-timeout="30000" concurrency-level="1000" striping="false"/>
                <transaction mode="NONE"/>
            </local-cache>
            <local-cache name="memcachedCache" start="EAGER">
                <locking isolation="NONE" acquire-timeout="30000" concurrency-level="1000" striping="false"/>
                <transaction mode="NONE"/>
            </local-cache>
            <local-cache name="namedCache" start="EAGER"/>
            
            <!-- ADD a local cache called 'teams' -->
           
            <local-cache 
                name="teams"
                start="EAGER"
                batching="false"
                indexing="NONE">
                
                <!-- Define the locking isolation of this cache -->
                <locking
                    isolation="REPEATABLE_READ"
                    acquire-timeout="20000"
                    concurrency-level="500"
                    striping="false" />
                    
                <!-- Disable transactions for this cache -->
                <transaction mode="NONE" />
                
                <!-- Define the JdbcBinaryCacheStores to point to the ExampleDS previously defined -->
                <string-keyed-jdbc-store datasource="java:jboss/datasources/ExampleDS" passivation="false" preload="false" purge="false">
                    <!-- Define the database dialect -->
                    <property name="databaseType">H2</property>
                    
                    <!-- specifies information about database table/column names and data types -->
                    <string-keyed-table prefix="JDG">
                        <id-column name="id" type="VARCHAR"/>
                        <data-column name="datum" type="BINARY"/>
                        <timestamp-column name="version" type="BIGINT"/>
                    </string-keyed-table>
                </string-keyed-jdbc-store>
            </local-cache>
            <!-- End of local cache called 'teams' definition -->
  
        </cache-container>
    </subsystem>
  

Start JBoss Data Grid 6

1. Open a command line and navigate to the root of the JBoss Data Grid directory.

2. The following shows the command line to start the server with the web profile:

    For Linux:   JDG_HOME/bin/standalone.sh
    For Windows: JDG_HOME\bin\standalone.bat
   

Build and Run the Quickstart

NOTE: The following build command assumes you have configured your Maven user settings. If you have not, you must include Maven setting arguments on the command line. See Build and Deploy the Quickstarts for complete instructions and additional options.

1. Make sure you have started the JBoss Server as described above.

2. Open a command line and navigate to the root directory of this quickstart.

3. Type this command to build and deploy the archive:

    mvn clean package 
   

4. This will create a file at target/memcached-endpoint-quickstart.jar

5. Run the example application in its directory:

    mvn exec:java
   

Using the application

Basic usage scenarios can look like this (keyboard shortcuts will be shown to you upon start):

    at  -  add a team
    ap  -  add a player to a team
    rt  -  remove a team
    rp  -  remove a player from a team
    p   -  print all teams and players
    q   -  quit

Type q one more time to exit the application.

Debug the Application

If you want to debug the source code or look at the Javadocs of any library in the project, run either of the following commands to pull them into your local repository. The IDE should then detect them.

mvn dependency:sources
mvn dependency:resolve -Dclassifier=javadoc