/* * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.jndi.ldap; import java.security.AccessController; import java.security.PrivilegedAction; import java.util.*; import javax.naming.NamingException; import com.sun.jndi.ldap.spi.LdapDnsProvider; import com.sun.jndi.ldap.spi.LdapDnsProviderResult; import sun.security.util.SecurityConstants; /** * The {@code LdapDnsProviderService} is responsible for creating and providing * access to the registered {@code LdapDnsProvider}s. The {@link ServiceLoader} * is used to find and register any implementations of {@link LdapDnsProvider}. * *
Instances of this class are safe for use by multiple threads.
*/
final class LdapDnsProviderService {
private static volatile LdapDnsProviderService service;
private static final Object LOCK = new int[0];
private final ServiceLoader