threshdconfigfactory.java

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//
// This file is part of the OpenNMS(R) Application.
//
// OpenNMS(R) is Copyright (C) 2002-2003 The OpenNMS Group, Inc.  All rights reserved.
// OpenNMS(R) is a derivative work, containing both original code, included code and modified
// code that was published under the GNU General Public License. Copyrights for modified 
// and included code are below.
//
// OpenNMS(R) is a registered trademark of The OpenNMS Group, Inc.
//
// Copyright (C) 1999-2001 Oculan Corp.  All rights reserved.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.                                                            
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//       
// For more information contact: 
//      OpenNMS Licensing       <[e-mail]>
//      http://www.opennms.org/
//      http://www.opennms.com/
//
// Tab Size = 8
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package org.opennms.netmgt.config;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringWriter;
import java.io.FileWriter;

import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.log4j.Category;
import org.apache.log4j.Priority;
import org.exolab.castor.xml.Marshaller;
import org.exolab.castor.xml.MarshalException;
import org.exolab.castor.xml.Unmarshaller;
import org.exolab.castor.xml.ValidationException;
import org.opennms.core.utils.ThreadCategory;
import org.opennms.netmgt.ConfigFileConstants;
import org.opennms.netmgt.config.threshd.ExcludeRange;
import org.opennms.netmgt.config.threshd.IncludeRange;
import org.opennms.netmgt.config.threshd.Service;
import org.opennms.netmgt.config.threshd.ThreshdConfiguration;
import org.opennms.netmgt.filter.Filter;
import org.opennms.netmgt.utils.IPSorter;
import org.opennms.netmgt.utils.IpListFromUrl;

/**
 * This is the singleton class used to load the configuration for the OpenNMS
 * Thresholding Daemon from the threshd-configuration xml file.
 * 
 * A mapping of the configured URLs to the iplist they contain is built at
 * init() time so as to avoid numerous file reads.
 * 
 * <strong>Note: </strong>Users of this class should make sure the
 * <em>init()</em> is called before calling any other method to ensure the
 * config is loaded before accessing other convenience methods.
 * 
 * @author <a href="mailto:[e-mail]>James Zuo </a>
 * @author <a href="mailto:[e-mail]">Mike Davidson </a>
 * @author <a href="mailto:[e-mail]">Sowmya Nataraj </a>
 * @author <a href="http://www.opennms.org/">OpenNMS </a>
 */
public final class ThreshdConfigFactory {
    /**
     * The singleton instance of this factory
     */
    private static ThreshdConfigFactory m_singleton = null;

    /**
     * This member is set to true if the configuration file has been loaded.
     */
    private static boolean m_loaded = false;

    /**
     * The config class loaded from the config file
     */
    private ThreshdConfiguration m_config;

    /**
     * A mapping of the configured URLs to a list of the specific IPs configured
     * in each - so as to avoid file reads
     */
    private Map m_urlIPMap;

    /**
     * A mapping of the configured package to a list of IPs selected via filter
     * rules, so as to avoid repetetive database access.
     */
    private Map m_pkgIpMap;

    /**
     * A boolean flag to indicate If a filter rule agaist the local OpenNMS
     * server has to be used.
     */
    private static boolean m_verifyServer;

    /**
     * The name of the local OpenNMS server
     */
    private static String m_localServer;

    /**
     * Go through the configuration and build a mapping of each configured URL
     * to a list of IPs configured in that URL - done at init() time so that
     * repeated file reads can be avoided
     */
    private void createUrlIpMap() {
        m_urlIPMap = new HashMap();

        Enumeration pkgEnum = m_config.enumeratePackage();
        while (pkgEnum.hasMoreElements()) {
            org.opennms.netmgt.config.threshd.Package pkg = (org.opennms.netmgt.config.threshd.Package) pkgEnum.nextElement();

            Enumeration urlEnum = pkg.enumerateIncludeUrl();
            while (urlEnum.hasMoreElements()) {
                String urlname = (String) urlEnum.nextElement();

                java.util.List iplist = IpListFromUrl.parse(urlname);
                if (iplist.size() > 0) {
                    m_urlIPMap.put(urlname, iplist);
                }
            }
        }
    }

    /**
     * This method is used to establish package agaist an iplist iplist mapping,
     * with which, the iplist is selected per package via the configured filter
     * rules from the database.
     */
    private void createPackageIpListMap() {
        Category log = ThreadCategory.getInstance(this.getClass());

        m_pkgIpMap = new HashMap();

        Enumeration pkgEnum = m_config.enumeratePackage();
        while (pkgEnum.hasMoreElements()) {
            org.opennms.netmgt.config.threshd.Package pkg = (org.opennms.netmgt.config.threshd.Package) pkgEnum.nextElement();

            //
            // Get a list of ipaddress per package agaist the filter rules from
            // database and populate the package, IP list map.
            //
            Filter filter = new Filter();
            StringBuffer filterRules = new StringBuffer(pkg.getFilter().getContent());

            try {
                if (m_verifyServer) {
                    filterRules.append(" & (serverName == ");
                    filterRules.append('\"');
                    filterRules.append(m_localServer);
                    filterRules.append('\"');
                    filterRules.append(")");
                }

                if (log.isDebugEnabled())
                    log.debug("createPackageIpMap: package is " + pkg.getName() + ". filer rules are  " + filterRules.toString());

                List ipList = filter.getIPList(filterRules.toString());
                if (ipList.size() > 0) {
                    m_pkgIpMap.put(pkg, ipList);
                }
            } catch (Throwable t) {
                if (log.isEnabledFor(Priority.ERROR)) {
                    log.error("createPackageIpMap: failed to map package: " + pkg.getName() + " to an IP List", t);
                }
            }
        }
    }

    /**
     * This nethod is used to rebuild the package agaist iplist mapping when
     * needed. When a node gained service event occurs, threshd has to determine
     * which package the ip/service combination is in, but if the interface is a
     * newly added one, the package iplist should be rebuilt so that threshd
     * could know which package this ip/service pair is in.
     */
    public synchronized void rebuildPackageIpListMap() {
        createPackageIpListMap();
    }

    /**
     * Private constructor
     * 
     * @exception java.io.IOException
     *                Thrown if the specified config file cannot be read
     * @exception org.exolab.castor.xml.MarshalException
     *                Thrown if the file does not conform to the schema.
     * @exception org.exolab.castor.xml.ValidationException
     *                Thrown if the contents do not match the required schema.
     */
    private ThreshdConfigFactory(String configFile) throws IOException, MarshalException, ValidationException {
        InputStream cfgIn = new FileInputStream(configFile);

        m_config = (ThreshdConfiguration) Unmarshaller.unmarshal(ThreshdConfiguration.class, new InputStreamReader(cfgIn));
        cfgIn.close();

        createUrlIpMap();

        OpennmsServerConfigFactory.init();
        m_verifyServer = OpennmsServerConfigFactory.getInstance().verifyServer();
        m_localServer = OpennmsServerConfigFactory.getInstance().getServerName();

        createPackageIpListMap();
    }

    /**
     * Load the config from the default config file and create the singleton
     * instance of this factory.
     * 
     * @exception java.io.IOException
     *                Thrown if the specified config file cannot be read
     * @exception org.exolab.castor.xml.MarshalException
     *                Thrown if the file does not conform to the schema.
     * @exception org.exolab.castor.xml.ValidationException
     *                Thrown if the contents do not match the required schema.
     */
    public static synchronized void init() throws IOException, MarshalException, ValidationException {
        if (m_loaded) {
            // init already called - return
            // to reload, reload() will need to be called