org.opencastproject.serviceregistry.impl.jmx.HostsStatistics.java Source code

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Here is the source code for org.opencastproject.serviceregistry.impl.jmx.HostsStatistics.java

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/**
 *  Copyright 2009, 2010 The Regents of the University of California
 *  Licensed under the Educational Community 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.osedu.org/licenses/ECL-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.opencastproject.serviceregistry.impl.jmx;

import org.opencastproject.serviceregistry.api.HostRegistration;
import org.opencastproject.serviceregistry.api.ServiceStatistics;
import org.opencastproject.util.jmx.JmxUtil;

import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.collections.PredicateUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import javax.management.MBeanNotificationInfo;
import javax.management.Notification;
import javax.management.NotificationBroadcasterSupport;

public class HostsStatistics extends NotificationBroadcasterSupport implements HostsStatisticsMXBean {

    private static final Logger logger = LoggerFactory.getLogger(HostsStatistics.class);

    private static final int ONLINE = 0;
    private static final int MAINTENANCE = 1;
    private static final int OFFLINE = 2;
    private long sequenceNumber = 1;

    private Map<String, Integer> hosts = new HashMap<String, Integer>();

    public HostsStatistics(List<ServiceStatistics> statistics) {
        for (ServiceStatistics stats : statistics) {
            String host = stats.getServiceRegistration().getHost();
            boolean online = stats.getServiceRegistration().isOnline();
            boolean inMaintenanceMode = stats.getServiceRegistration().isInMaintenanceMode();
            if (!stats.getServiceRegistration().isActive()) {
                hosts.remove(host);
                logger.trace("Removing inactive host '{}'", host);
                continue;
            }
            if (online && !inMaintenanceMode) {
                hosts.put(host, ONLINE);
            } else if (online && inMaintenanceMode) {
                hosts.put(host, MAINTENANCE);
            } else {
                hosts.put(host, OFFLINE);
            }
        }
    }

    public void updateHost(HostRegistration host) {
        if (!host.isActive()) {
            hosts.remove(host.toString());
            logger.trace("Removing inactive host '{}'", host);
            return;
        }

        if (host.isOnline() && !host.isMaintenanceMode()) {
            hosts.put(host.toString(), ONLINE);
        } else if (host.isOnline() && host.isMaintenanceMode()) {
            hosts.put(host.toString(), MAINTENANCE);
        } else {
            hosts.put(host.toString(), OFFLINE);
        }

        sendNotification(JmxUtil.createUpdateNotification(this, sequenceNumber++, "Host updated"));
    }

    @Override
    public MBeanNotificationInfo[] getNotificationInfo() {
        String[] types = new String[] { JmxUtil.MATTERHORN_UPDATE_NOTIFICATION };

        String name = Notification.class.getName();
        String description = "An update was executed";
        MBeanNotificationInfo info = new MBeanNotificationInfo(types, name, description);
        return new MBeanNotificationInfo[] { info };
    }

    /**
     * @see org.opencastproject.serviceregistry.impl.jmx.HostsStatisticsMXBean#getTotalCount()
     */
    @Override
    public int getTotalCount() {
        return hosts.size();
    }

    /**
     * @see org.opencastproject.serviceregistry.impl.jmx.HostsStatisticsMXBean#getOnlineCount()
     */
    @Override
    public int getOnlineCount() {
        return CollectionUtils.countMatches(hosts.values(), PredicateUtils.equalPredicate(ONLINE));
    }

    /**
     * @see org.opencastproject.serviceregistry.impl.jmx.HostsStatisticsMXBean#getOfflineCount()
     */
    @Override
    public int getOfflineCount() {
        return CollectionUtils.countMatches(hosts.values(), PredicateUtils.equalPredicate(OFFLINE));
    }

    /**
     * @see org.opencastproject.serviceregistry.impl.jmx.HostsStatisticsMXBean#getInMaintenanceCount()
     */
    @Override
    public int getInMaintenanceCount() {
        return CollectionUtils.countMatches(hosts.values(), PredicateUtils.equalPredicate(MAINTENANCE));
    }

    /**
     * @see org.opencastproject.serviceregistry.impl.jmx.HostsStatisticsMXBean#getAll()
     */
    @Override
    public String[] getAll() {
        return hosts.keySet().toArray(new String[hosts.size()]);
    }

    /**
     * @see org.opencastproject.serviceregistry.impl.jmx.HostsStatisticsMXBean#getOnline()
     */
    @Override
    public String[] getOnline() {
        List<String> onlineHosts = new ArrayList<String>();
        for (Entry<String, Integer> entry : hosts.entrySet()) {
            if (entry.getValue().equals(ONLINE))
                onlineHosts.add(entry.getKey());
        }
        return onlineHosts.toArray(new String[onlineHosts.size()]);
    }

    /**
     * @see org.opencastproject.serviceregistry.impl.jmx.HostsStatisticsMXBean#getOffline()
     */
    @Override
    public String[] getOffline() {
        List<String> offlineHosts = new ArrayList<String>();
        for (Entry<String, Integer> entry : hosts.entrySet()) {
            if (entry.getValue().equals(OFFLINE))
                offlineHosts.add(entry.getKey());
        }
        return offlineHosts.toArray(new String[offlineHosts.size()]);
    }

    /**
     * @see org.opencastproject.serviceregistry.impl.jmx.HostsStatisticsMXBean#getInMaintenance()
     */
    @Override
    public String[] getInMaintenance() {
        List<String> maintenanceHosts = new ArrayList<String>();
        for (Entry<String, Integer> entry : hosts.entrySet()) {
            if (entry.getValue().equals(MAINTENANCE))
                maintenanceHosts.add(entry.getKey());
        }
        return maintenanceHosts.toArray(new String[maintenanceHosts.size()]);
    }

}