com.unboundid.util.ThreadLocalSecureRandom Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of unboundid-ldapsdk Show documentation

The UnboundID LDAP SDK for Java is a fast, comprehensive, and easy-to-use Java API for communicating with LDAP directory servers and performing related tasks like reading and writing LDIF, encoding and decoding data using base64 and ASN.1 BER, and performing secure communication. This package contains the Standard Edition of the LDAP SDK, which is a complete, general-purpose library for communicating with LDAPv3 directory servers.

The newest version!

/*
 * Copyright 2021-2024 Ping Identity Corporation
 * All Rights Reserved.
 */
/*
 * Copyright 2021-2024 Ping Identity Corporation
 *
 * 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.
 */
/*
 * Copyright (C) 2021-2024 Ping Identity Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (GPLv2 only)
 * or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
 * 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 .
 */
package com.unboundid.util;



import java.security.SecureRandom;



/**
 * This class provides a means of obtaining a thread-local {@code SecureRandom}
 * instance that can be used without synchronization or contention.
 */
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class ThreadLocalSecureRandom
{
  /**
   * The thread-local instances that have been created.
   */
  @NotNull private static final ThreadLocal INSTANCES =
       new ThreadLocal<>();



  /**
   * Prevents this utility class from being instantiated.
   */
  private ThreadLocalSecureRandom()
  {
    // No implementation is required.
  }



  /**
   * Retrieves a thread-local {@code SecureRandom} instance.
   *
   * @return  A thread-local {@code SecureRandom} instance.
   */
  @NotNull()
  public static SecureRandom get()
  {
    SecureRandom random = INSTANCES.get();
    if (random == null)
    {
      random = CryptoHelper.getSecureRandom();
      INSTANCES.set(random);
    }

    return random;
  }
}