UUIDUtil.java

/*! ******************************************************************************
 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2013 by Pentaho : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * 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 org.pentaho.di.core.util;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.pentaho.di.i18n.BaseMessages;
import org.safehaus.uuid.UUID;
import org.safehaus.uuid.UUIDGenerator;

public class UUIDUtil {
  private static Class<?> PKG = UUIDUtil.class; // for i18n purposes, needed by Translator2!!

  private static Log log = LogFactory.getLog( UUIDUtil.class );

  static boolean nativeInitialized = false;

  static UUIDGenerator ug;

  static org.safehaus.uuid.EthernetAddress eAddr;

  static {
    // Try loading the EthernetAddress library. If this fails, then fallback
    // to
    // using another method for generating UUID's.
    /*
     * This is always going to fail at the moment try { System.loadLibrary("EthernetAddress"); nativeInitialized = true;
     * } catch (Throwable t) { // log.warn(BaseMessages.getString(PKG, "UUIDUtil.ERROR_0001_LOADING_ETHERNET_ADDRESS")
     * ); // Ignore for now. }
     */
    ug = UUIDGenerator.getInstance();
    if ( nativeInitialized ) {
      try {
        com.ccg.net.ethernet.EthernetAddress ea = com.ccg.net.ethernet.EthernetAddress.getPrimaryAdapter();
        eAddr = new org.safehaus.uuid.EthernetAddress( ea.getBytes() );
      } catch ( Exception ex ) {
        log.error( BaseMessages.getString( PKG, "UUIDUtil.ERROR_0002_GET_MAC_ADDR" ), ex );
      } catch ( UnsatisfiedLinkError ule ) {
        log.error( BaseMessages.getString( PKG, "UUIDUtil.ERROR_0002_GET_MAC_ADDR" ), ule );
        nativeInitialized = false;
      }
    }

    /*
     * Add support for running in clustered environments. In this way, the MAC address of the running server can be
     * added to the environment with a -DMAC_ADDRESS=00:50:56:C0:00:01
     */
    if ( eAddr == null ) {
      String macAddr = System.getProperty( "MAC_ADDRESS" );
      if ( macAddr != null ) {
        // On Windows machines, people would be inclined to get the MAC
        // address with ipconfig /all. The format of this would be
        // something like 00-50-56-C0-00-08. So, replace '-' with ':' before
        // creating the address.
        //
        macAddr = macAddr.replace( '-', ':' );
        eAddr = new org.safehaus.uuid.EthernetAddress( macAddr );
      }
    }

    if ( eAddr == null ) {
      // Still don't have an Ethernet Address - generate a dummy one.
      eAddr = ug.getDummyAddress();
    }

    // Generate a UUID to make sure everything is running OK.
    UUID olduuId = ug.generateTimeBasedUUID( eAddr );
    if ( olduuId == null ) {
      log.error( BaseMessages.getString( PKG, "UUIDUtil.ERROR_0003_GENERATEFAILED" ) );
    }

  }

  public static String getUUIDAsString() {
    return getUUID().toString();
  }

  public static UUID getUUID() {
    return ug.generateTimeBasedUUID( eAddr );
  }

}