com.opengsn.controller.manager.CloudManagerClient.java Source code

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Here is the source code for com.opengsn.controller.manager.CloudManagerClient.java

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/**
 * Copyright 2009-2011 cole de technologie suprieure,
 * Communication Research Centre Canada,
 * Inocybe Technologies Inc. and 6837247 CANADA Inc.
 *
 * Licensed 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 com.opengsn.controller.manager;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.greenstarnetwork.services.cloudmanager.ICloudManager;
import com.greenstarnetwork.services.cloudmanager.IdPriority;
import com.greenstarnetwork.services.cloudmanager.OverrideMapType;
import com.greenstarnetwork.services.cloudmanager.OverrideMapType.PrioritiesList;
import com.opengsn.controller.model.Host;
import com.opengsn.services.cloudmanager.model.VmHostModel;

/**
 * Handling the connection with the Cloud Manager
 * @author knguyen
 *
 */
public class CloudManagerClient {
    Logger log = LoggerFactory.getLogger(CloudManagerClient.class);

    //Resource ID tag involved in a XML string representing a resource data model
    public static String RESOURCE_ID_ELEMENT = "<resourceId>";
    //Resource Name tag involved in a XML string representing a resource data model
    public static String RESOURCE_NAME_ELEMENT = "<resourceName>";
    //Domain ID tag involved in a XML string representing a resource data model
    public static String DOMAIN_ID_ELEMENT = "<domainId>";

    private ICloudManager cloudMgr = null;

    public CloudManagerClient() {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
                new String[] { "webapp/WEB-INF/applicationContext.xml" });
        cloudMgr = (ICloudManager) context.getBean("cloudManagerClient");
    }

    /**
     * Get Host Resource Models of a given Cloud Manager
     * @return
     */
    public List<Host> getHostList() {
        List<String> hostlist = cloudMgr.describeHosts();
        if (hostlist != null) {
            Iterator<String> it = hostlist.iterator();
            List<Host> ret = new ArrayList<Host>();
            while (it.hasNext()) {
                Host host = this.getHostFromXML((String) it.next());
                if (host != null)
                    ret.add(host);
            }
            if (ret.size() > 0)
                return ret;
        }
        return null;
    }

    /**
     * Execute a migration action. 
     */
    public String migrateVM(String hostId, String vmName, String destHostId) {
        String response = cloudMgr.migrateInstance(hostId, vmName, destHostId);
        log.debug("Migrate Response: " + response);
        return response;
    }

    /**
     * Update host priority list
     * @param list
     */
    public void updateHostPriorityTable(Map<String, Integer> list) {

        PrioritiesList pList = new PrioritiesList();

        Set<String> keys = list.keySet();
        Iterator<String> itr = keys.iterator();

        while (itr.hasNext()) {
            String id = itr.next();
            Integer num = list.get(id);
            IdPriority priority = new IdPriority();
            priority.setId(id);
            priority.setPriority(num);
            pList.getPriorities().add(priority);
        }

        OverrideMapType overrideMap = new OverrideMapType();
        overrideMap.setPrioritiesList(pList);

        cloudMgr.overrideHostPriorities(overrideMap);
    }

    /**
     * Get a Host data from a XML string containing VmHostModel and a resource ID
     * @param xml
     * @return
     */
    private Host getHostFromXML(String xml) {
        Host ret = new Host();
        VmHostModel model = VmHostModel.fromXML(xml);
        ret.setHostModel(model);
        //extract resource ID
        int pi = xml.indexOf(RESOURCE_ID_ELEMENT);
        if (pi > -1) {
            pi += RESOURCE_ID_ELEMENT.length();
            int pj = xml.indexOf("<", pi + 1);
            ret.setResourceID(xml.substring(pi, pj));
        }
        //extract resource Name
        pi = xml.indexOf(RESOURCE_NAME_ELEMENT);
        if (pi > -1) {
            pi += RESOURCE_NAME_ELEMENT.length();
            int pj = xml.indexOf("<", pi + 1);
            ret.setResourceName(xml.substring(pi, pj));
        }
        //extract resource Domain ID
        pi = xml.indexOf(DOMAIN_ID_ELEMENT);
        if (pi > -1) {
            pi += DOMAIN_ID_ELEMENT.length();
            int pj = xml.indexOf("<", pi + 1);
            ret.setDomainID(xml.substring(pi, pj));
        }
        return ret;
    }

}