IDUtilities.java

/*
 * GovWay - A customizable API Gateway 
 * https://govway.org
 * 
 * Copyright (c) 2005-2025 Link.it srl (https://link.it). 
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3, as published by
 * the Free Software Foundation.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *
 */
package org.openspcoop2.utils.id;

import java.security.SecureRandom;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.openspcoop2.utils.SemaphoreLock;
import org.openspcoop2.utils.Utilities;
import org.openspcoop2.utils.date.DateEngineType;
import org.openspcoop2.utils.date.DateManager;
import org.openspcoop2.utils.date.DateUtils;

/**
 * Identity
 *
 * @author Poli Andrea (apoli@link.it)
 * @author $Author$
 * @version $Rev$, $Date$
 */
public class IDUtilities {

    private static long uniqueSerialNumber = 0;
    private static org.openspcoop2.utils.Semaphore semaphore_getUniqueSerialNumber = new org.openspcoop2.utils.Semaphore("IDUtilities.getUniqueSerialNumber");
    public static long getUniqueSerialNumber(){
        return getUniqueSerialNumber("anonymous", null);
    }
    public static long getUniqueSerialNumber(String methodName){
        return getUniqueSerialNumber(methodName, null);
    }
    public static long getUniqueSerialNumber(String methodName, String idTransazione){
        SemaphoreLock lock = semaphore_getUniqueSerialNumber.acquireThrowRuntime(methodName, idTransazione);
        try {
            
            if((IDUtilities.uniqueSerialNumber+1) > Long.MAX_VALUE){
                IDUtilities.uniqueSerialNumber = 0;
            } 
            IDUtilities.uniqueSerialNumber++;
            return IDUtilities.uniqueSerialNumber;
            
        }finally {
            semaphore_getUniqueSerialNumber.release(lock, methodName, idTransazione);
        }
    }
    
    private static final char[] symbols;
    static {
        StringBuilder tmp = new StringBuilder();
        for (char ch = '0'; ch <= '9'; ++ch)
          tmp.append(ch);
        for (char ch = 'a'; ch <= 'z'; ++ch)
          tmp.append(ch);
        symbols = tmp.toString().toCharArray();
    }   
    private static final SecureRandom random = new SecureRandom();
    private static final Map<String, char[]> mapRandom = new ConcurrentHashMap<String, char[]>();
    private static synchronized char[] getBufferForRandom(int length){
        String key = length+"";
        if(IDUtilities.mapRandom.containsKey(key)){
            return IDUtilities.mapRandom.get(key);
        }
        else{
            char[] buf = new char[length];
            IDUtilities.mapRandom.put(key, buf);
            return buf;
        }
    }
    public static String generateAlphaNumericRandomString(int length) {
        char[] buf = IDUtilities.getBufferForRandom(length);
        for (int idx = 0; idx < buf.length; ++idx) 
            buf[idx] = IDUtilities.symbols[IDUtilities.random.nextInt(IDUtilities.symbols.length)];
        return new String(buf);
    }
    
    private static org.openspcoop2.utils.Semaphore semaphore_generateDateTime = new org.openspcoop2.utils.Semaphore("IDUtilities.generateDateTime");
    public static String generateDateTime(String format, int syncMs) {
        return IDUtilities.generateDateTime(DateUtils.getDEFAULT_DATA_ENGINE_TYPE(), format, syncMs);
    }
    public static String generateDateTime(DateEngineType type, String format, int syncMs) {
        SemaphoreLock lock = semaphore_generateDateTime.acquireThrowRuntime("generateDateTime");
        try {
            Utilities.sleep(syncMs);
            return DateUtils.getTimeFormatter(type, format).format(DateManager.getDate());
        }finally {
            semaphore_generateDateTime.release(lock, "generateDateTime");
        }
    }
    public static String generateDateTime_ISO_8601_TZ(String format, int syncMs) {
        return IDUtilities.generateDateTime_ISO_8601_TZ(DateUtils.getDEFAULT_DATA_ENGINE_TYPE(), format, syncMs);
    }
    public static String generateDateTime_ISO_8601_TZ(DateEngineType type, String format, int syncMs) {
        SemaphoreLock lock = semaphore_generateDateTime.acquireThrowRuntime("generateDateTime_ISO_8601_TZ");
        try {
            Utilities.sleep(syncMs);
            return DateUtils.getDateTimeFormatter_ISO_8601_TZ(type, format).format(DateManager.getDate());
        }finally {
            semaphore_generateDateTime.release(lock, "generateDateTime_ISO_8601_TZ");
        }
    }
}