examples/simple-web-cluster/src/main/java/org/apache/brooklyn/demo/WebClusterDatabaseExample.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.brooklyn.demo;

import static org.apache.brooklyn.core.sensor.DependentConfiguration.attributeWhenReady;
import static org.apache.brooklyn.core.sensor.DependentConfiguration.formatString;
import static org.apache.brooklyn.entity.java.JavaEntityMethods.javaSysProp;

import java.util.List;
import java.util.concurrent.TimeUnit;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.brooklyn.entity.database.mysql.MySqlNode;
import org.apache.brooklyn.api.entity.EntitySpec;
import org.apache.brooklyn.api.sensor.AttributeSensor;
import org.apache.brooklyn.core.entity.AbstractApplication;
import org.apache.brooklyn.core.entity.Entities;
import org.apache.brooklyn.core.entity.StartableApplication;
import org.apache.brooklyn.core.location.PortRanges;
import org.apache.brooklyn.core.sensor.Sensors;
import org.apache.brooklyn.enricher.stock.Enrichers;
import org.apache.brooklyn.entity.webapp.ControlledDynamicWebAppCluster;
import org.apache.brooklyn.entity.webapp.DynamicWebAppCluster;
import org.apache.brooklyn.entity.webapp.JavaWebAppService;
import org.apache.brooklyn.entity.webapp.WebAppService;
import org.apache.brooklyn.entity.webapp.WebAppServiceConstants;
import org.apache.brooklyn.launcher.BrooklynLauncher;
import org.apache.brooklyn.policy.autoscaling.AutoScalerPolicy;
import org.apache.brooklyn.policy.enricher.HttpLatencyDetector;
import org.apache.brooklyn.util.CommandLineUtil;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;

/**
 * Launches a 3-tier app with nginx, clustered jboss, and mysql.
 **/
public class WebClusterDatabaseExample extends AbstractApplication {
    
    public static final Logger LOG = LoggerFactory.getLogger(WebClusterDatabaseExample.class);
    
    public static final String WAR_PATH = "classpath://hello-world-sql-webapp.war";
    
    public static final String DB_SETUP_SQL_URL = "classpath://visitors-creation-script.sql";
    
    public static final String DB_TABLE = "visitors";
    public static final String DB_USERNAME = "brooklyn";
    public static final String DB_PASSWORD = "br00k11n";
    
    public static final AttributeSensor<Integer> APPSERVERS_COUNT = Sensors.newIntegerSensor( 
            "appservers.count", "Number of app servers deployed");

    @Override
    public void initApp() {
        MySqlNode mysql = addChild(EntitySpec.create(MySqlNode.class)
                .configure("creationScriptUrl", DB_SETUP_SQL_URL));
        
        ControlledDynamicWebAppCluster web = addChild(EntitySpec.create(ControlledDynamicWebAppCluster.class)
                .configure(WebAppService.HTTP_PORT, PortRanges.fromString("8080+"))
                .configure(JavaWebAppService.ROOT_WAR, WAR_PATH)
                .configure(javaSysProp("brooklyn.example.db.url"), 
                        formatString("jdbc:%s%s?user=%s\\&password=%s", 
                                attributeWhenReady(mysql, MySqlNode.DATASTORE_URL), 
                                DB_TABLE, DB_USERNAME, DB_PASSWORD)) );

        web.enrichers().add(HttpLatencyDetector.builder().
                url(ControlledDynamicWebAppCluster.ROOT_URL).
                rollup(10, TimeUnit.SECONDS).
                build());

        // simple scaling policy
        web.getCluster().policies().add(AutoScalerPolicy.builder().
                metric(DynamicWebAppCluster.REQUESTS_PER_SECOND_IN_WINDOW_PER_NODE).
                metricRange(10, 100).
                sizeRange(1, 5).
                build());

        // expose some KPI's
        enrichers().add(Enrichers.builder()
                .propagating(WebAppServiceConstants.ROOT_URL,
                        DynamicWebAppCluster.REQUESTS_PER_SECOND_IN_WINDOW,
                        HttpLatencyDetector.REQUEST_LATENCY_IN_SECONDS_IN_WINDOW)
                .from(web)
                .build());

        enrichers().add(Enrichers.builder()
                .propagating(ImmutableMap.of(DynamicWebAppCluster.GROUP_SIZE, APPSERVERS_COUNT))
                .from(web)
                .build());
    }

    public static void main(String[] argv) {
        List<String> args = Lists.newArrayList(argv);
        String port =  CommandLineUtil.getCommandLineOption(args, "--port", "8081+");
        String location = CommandLineUtil.getCommandLineOption(args, "--location", "localhost");

        BrooklynLauncher launcher = BrooklynLauncher.newInstance()
                .application(EntitySpec.create(StartableApplication.class, WebClusterDatabaseExample.class).displayName("Brooklyn WebApp Cluster with Database example"))
                .restServerPort(port)
                .location(location)
                .start();
         
        Entities.dumpInfo(launcher.getApplications());
    }
}