/*
 * Licensed to the University of California, Berkeley under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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 tachyon.client;

import java.util.Random;

/**
 * Utilities class for Tachyon Client. All methods and variables are static. This class is thread
 * safe.
 */
public final class Utils {
  private static Random sRandom = new Random();

  public static synchronized long getRandomNonNegativeLong() {
    return Math.abs(sRandom.nextLong());
  }

  // Prevent instantiation
  private Utils() {}
}

/*
 * Licensed to the University of California, Berkeley under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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 tachyon.client;

import java.util.Random;

/**
 * Utilities class for Tachyon Client. All methods and variables are static. This class is thread
 * safe.
 */
public final class Utils {
  private static Random sRandom = new Random();

  /**
   * @return a random long which is guaranteed to be non negative (zero is allowed)
   */
  public static synchronized long getRandomNonNegativeLong() {
    return Math.abs(sRandom.nextLong());
  }

  // Prevent instantiation
  private Utils() {}
}

Add javadoc for utils.