org.apache.stratos.mediator.autoscale.lbautoscale.callables.RunningInstanceCountCallable.java Source code

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Here is the source code for org.apache.stratos.mediator.autoscale.lbautoscale.callables.RunningInstanceCountCallable.java

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/**
 *  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.stratos.mediator.autoscale.lbautoscale.callables;

import org.apache.axis2.clustering.management.GroupManagementAgent;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.stratos.mediator.autoscale.lbautoscale.util.AutoscalerTaskDSHolder;

import java.util.concurrent.Callable;

/** Calculate running instances of each service domain, sub domain combination **/
public class RunningInstanceCountCallable implements Callable<Integer> {

    private static final Log log = LogFactory.getLog(RunningInstanceCountCallable.class);
    private String domain;
    private String subDomain;

    public RunningInstanceCountCallable(String domain, String subDomain) {
        this.domain = domain;
        this.subDomain = subDomain;
    }

    @Override
    public Integer call() throws Exception {
        int runningInstances;
        // for each sub domain, get the clustering group management agent
        GroupManagementAgent agent = AutoscalerTaskDSHolder.getInstance().getAgent()
                .getGroupManagementAgent(this.domain, this.subDomain);

        // if it isn't null
        if (agent != null) {
            // we calculate running instance count for this service domain
            runningInstances = agent.getMembers().size();
        } else {
            // if agent is null, we assume no service instances are running
            runningInstances = 0;
        }

        log.debug("Running instance count for domain: " + this.domain + ", sub domain: " + this.subDomain + " is "
                + runningInstances);

        return runningInstances;
    }

}