com.clustercontrol.port.protocol.ReachAddressDNS.java Source code

Introduction

Here is the source code for com.clustercontrol.port.protocol.ReachAddressDNS.java

Source

/*
    
 Copyright (C) 2006 NTT DATA Corporation
    
 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, version 2.
    
 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.
    
 */

package com.clustercontrol.port.protocol;

import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Properties;

import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.InitialDirContext;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.clustercontrol.maintenance.util.HinemosPropertyUtil;
import com.clustercontrol.util.HinemosTime;
import com.clustercontrol.util.MessageConstant;

/**
 * DNS?????????
 *
 * @version 4.0.0
 * @since 4.0.0
 */
public class ReachAddressDNS extends ReachAddressProtocol {

    private static Log m_log = LogFactory.getLog(ReachAddressDNS.class);

    /**
     * DNS????????
     *
     * @param addressText
     * @return DNS
     */
    /*
     * (non-Javadoc)
     *
     * @see
     * com.clustercontrol.port.protocol.ReachAddressProtocol#isRunning(java.
     * lang.String)
     */
    @Override
    protected boolean isRunning(String addressText) {

        m_message = "";
        m_messageOrg = "";
        m_response = -1;

        boolean isReachable = false;

        try {
            long start = 0; // 
            long end = 0; // 
            boolean retry = true; // ????(true:??false:???)

            StringBuffer bufferOrg = new StringBuffer(); // 
            String result = "";

            InetAddress address = InetAddress.getByName(addressText);
            String addressStr = address.getHostAddress();
            if (address instanceof Inet6Address) {
                addressStr = "[" + addressStr + "]";
            }

            bufferOrg.append("Monitoring the DNS Service of " + address.getHostName() + "["
                    + address.getHostAddress() + "]:" + m_portNo + ".\n\n");

            Properties props = new Properties();
            props.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.dns.DnsContextFactory");
            props.put(Context.PROVIDER_URL, "dns://" + addressStr + ":" + m_portNo);
            props.put("com.sun.jndi.dns.timeout.initial", String.valueOf(m_timeout));
            props.put("com.sun.jndi.dns.timeout.retries", "1");

            InitialDirContext idctx = null;

            String hostname = HinemosPropertyUtil.getHinemosPropertyStr("monitor.port.protocol.dns", "localhost");
            m_log.debug("The hostname from which to retrieve attributes is " + hostname);

            for (int i = 0; i < m_sentCount && retry; i++) {
                try {
                    bufferOrg.append(HinemosTime.getDateString() + " Tried to Connect: ");

                    start = HinemosTime.currentTimeMillis();

                    idctx = new InitialDirContext(props);
                    Attributes attrs = idctx.getAttributes(hostname);

                    end = HinemosTime.currentTimeMillis();

                    bufferOrg.append("\n");
                    NamingEnumeration<? extends Attribute> allAttr = attrs.getAll();
                    while (allAttr.hasMore()) {
                        Attribute attr = allAttr.next();
                        bufferOrg.append("Attribute: " + attr.getID() + "\n");
                        NamingEnumeration<?> values = attr.getAll();
                        while (values.hasMore())
                            bufferOrg.append("Value: " + values.next() + "\n");
                    }
                    bufferOrg.append("\n");

                    m_response = end - start;

                    if (m_response > 0) {
                        if (m_response < m_timeout) {
                            result = result + ("Response Time = " + m_response + "ms");
                        } else {
                            m_response = m_timeout;
                            result = result + ("Response Time = " + m_response + "ms");
                        }
                    } else {
                        result = result + ("Response Time < 1ms");
                    }

                    retry = false;
                    isReachable = true;

                } catch (NamingException e) {
                    result = (e.getMessage() + "[NamingException]");
                    retry = true;
                    isReachable = false;
                } catch (Exception e) {
                    result = (e.getMessage() + "[Exception]");
                    retry = true;
                    isReachable = false;
                } finally {
                    bufferOrg.append(result + "\n");
                    try {
                        if (idctx != null) {
                            idctx.close();
                        }
                    } catch (NamingException e) {
                        m_log.warn("isRunning(): " + "socket disconnect failed: " + e.getMessage(), e);
                    }
                }

                if (i < m_sentCount - 1 && retry) {
                    try {
                        Thread.sleep(m_sentInterval);
                    } catch (InterruptedException e) {
                        break;
                    }
                }
            }

            m_message = result + "(DNS/" + m_portNo + ")";
            m_messageOrg = bufferOrg.toString();
            return isReachable;
        } catch (UnknownHostException e) {
            m_log.debug("isRunning(): " + MessageConstant.MESSAGE_FAIL_TO_EXECUTE_TO_CONNECT.getMessage()
                    + e.getMessage());

            m_message = MessageConstant.MESSAGE_FAIL_TO_EXECUTE_TO_CONNECT.getMessage() + " (" + e.getMessage()
                    + ")";

            return false;
        }
    }
}