com.centurylink.mdw.soccom.SoccomMessage Maven / Gradle / Ivy

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MDW is a microservices based workflow framework
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/*
 * Copyright (C) 2017 CenturyLink, 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.centurylink.mdw.soccom;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

class SoccomMessage
{
    static final int HEADER_SIZE = 48;
    static final int MSGID_SIZE = 24;
    static final int MSGSIZE_OFFSET = 40;
    
    static synchronized void setHostName() {
        if (hostname != null) return;
        try {
            InetAddress addr = InetAddress.getLocalHost();
            hostname = addr.getHostName();
            hostname = (hostname+"**********").substring(0,10);
        } catch (UnknownHostException e) {
            hostname = "**********";
        }
    }

    static byte[] makeMessage(String msgbody, String msgid)
    {
    StringBuffer sb = new StringBuffer();
    int length = msgbody.length();
    if (_seqno==0) {
        if (hostname==null) setHostName();
        Random ran = new Random();
        _randomId = new DecimalFormat(nf6).format(ran.nextInt(1000000));
    }
    if (msgid!=null) {
        sb.append(msgid);
    } else {
        sb.append("#@");
        sb.append(hostname);
        sb.append(_randomId);
        sb.append(new DecimalFormat(nf6).format(nextSeqNo()));
    }
    sb.append(new SimpleDateFormat(df).format(new Date()));
    sb.append(new DecimalFormat(nf8).format(length));
    sb.append(msgbody);
    return sb.toString().getBytes();
    }

    static byte[] makeMessageSpecial(String special, String msgid)
    {
    StringBuffer sb = new StringBuffer();
    if (_seqno==0) {
        Random ran = new Random();
        _randomId = new DecimalFormat(nf6).format(ran.nextInt(1000000));
    }
    if (msgid!=null) {
        sb.append(msgid);
    } else {
        sb.append("#@");
        sb.append(hostname);
        sb.append(_randomId);
        sb.append(new DecimalFormat(nf6).format(nextSeqNo()));
    }
    sb.append(new SimpleDateFormat(df).format(new Date()));
    sb.append(special);
    return sb.toString().getBytes();
    }

    synchronized static int nextSeqNo()
    {
    return _seqno++;
    }

    private static String _randomId;
    private static int _seqno = 0;
    private static String df = "yyyyMMddHHmmss00";
    private static String nf6 = "000000";
    private static String nf8 = "00000000";
    private static String hostname = null;
}