First stab at pure-java brooklyn application syntax

WebClusterDatabaseExamplePureJava.java

package brooklyn.demo;

import static brooklyn.event.basic.DependentConfiguration.valueWhenAttributeReady;

import brooklyn.entity.basic.AbstractApplication;
import brooklyn.entity.database.mysql.MySqlNode;
import brooklyn.entity.proxy.nginx.NginxController;
import brooklyn.entity.webapp.ControlledDynamicWebAppCluster;
import brooklyn.entity.webapp.DynamicWebAppCluster;
import brooklyn.entity.webapp.jboss.JBoss7Server;
import brooklyn.policy.autoscale.AutoScalerPolicy;


/**
 * Launches a 3-tier app with nginx, clustered jboss, and mysql.
 * 
 * v2 of gist: uses "proper builders", and not factory, rather than builder-style methods on actual object...
 **/
public class WebClusterDatabaseExamplePureJava extends AbstractApplication {
    
    public static final String WAR_PATH = "classpath://hello-world-sql-webapp.war";
    
    public static final String DB_USERNAME = "brooklyn";
    public static final String DB_PASSWORD = "br00k11n";

    // "jdbc:mysql://localhost/visitors?user=brooklyn&password=br00k11n"
    public static final String DB_URL_FORMAT = "jdbc:%s/visitors?user="+DB_USERNAME+"&password="+DB_PASSWORD;
    
    public static final String DB_SETUP_SQL =
            "create database visitors;"+"\n"+
            "use visitors; "+"\n"+
            "create user '${DB_USERNAME}' identified by '${DB_PASSWORD}';"+"\n"+
            "grant usage on *.* to '${DB_USERNAME}'@'%' identified by '${DB_PASSWORD}';"+"\n"+
            "# ''@localhost is sometimes set up, overriding brooklyn@'%', so do a second explicit grant"+"\n"+
            "grant usage on *.* to '${DB_USERNAME}'@'localhost' identified by '${DB_PASSWORD}';"+"\n"+
            "grant all privileges on visitors.* to '${DB_USERNAME}'@'%';"+"\n"+
            "flush privileges;"+"\n"+
            "\n"+
            "CREATE TABLE MESSAGES ("+"\n"+
            "        id INT NOT NULL AUTO_INCREMENT,"+"\n"+
            "        NAME VARCHAR(30) NOT NULL,"+"\n"+
            "        MESSAGE VARCHAR(400) NOT NULL,"+"\n"+
            "        PRIMARY KEY (ID)"+"\n"+
            "    );"+"\n"+
                "\n"+
            "INSERT INTO MESSAGES values (default, 'Isaac Asimov', 'I grew up in Brooklyn' );";

    public void init() {
        displayName("Brooklyn WebApp Cluster with Database example");

        MySqlNode mysql =  MySqlNode.builder()
                .creationScriptContents(DB_SETUP_SQL)
                .build();
        addChild(mysql);
    
        addChild(ControlledDynamicWebAppCluster.builder()
                .controller(NginxController.builder()
                        .port(8080)
                        .build())
                .appServerBuilder(JBoss7Server.builder()
                        .httpPort("8000+")
                        .rootWar(WAR_PATH)
                        .javaOption("brooklyn.example.db.url", valueWhenAttributeReady(mysql, 
                                MySqlNode.MYSQL_URL, PostProcessors.stringFormat(DB_URL_FORMAT))))
                .policy(AutoScalerPolicy.builder()
                        .trigger(DynamicWebAppCluster.AVERAGE_REQUESTS_PER_SECOND)
                        .sizeRange(1, 5)
                        .metricRange(10, 100)
                        .build())
                .build());
    }
}