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Java UUID Generator (JUG) is a Java library for generating Universally Unique IDentifiers, UUIDs (see http://en.wikipedia.org/wiki/UUID). It can be used either as a component in a bigger application, or as a standalone command line tool. JUG generates UUIDs according to the IETF UUID draft specification. JUG supports 3 original official UUID generation methods as well as later additions (v6, v7)

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/* JUG Java Uuid Generator
 *
 * Copyright (c) 2002 Tatu Saloranta, [email protected]
 *
 * Licensed under the License specified in the file LICENSE which is
 * included with the source code.
 * You may not use this file except in compliance with the License.
 *
 * 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.fasterxml.uuid;

/**
 * UUIDClock is used by UUIDTimer to get the current time. The default
 * implementation returns the time from the system clock, but this class can
 * be overriden to return any number. This is useful when UUIDs with past or
 * future timestamps should be generated, or when UUIDs must be generated in
 * a reproducible manner.
 *
 * @since 3.3
 */
public class UUIDClock
{
    /**
     * Returns the current time in milliseconds.
     */
    public long currentTimeMillis()
    {
        return System.currentTimeMillis();
    }
}