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src/java.naming/share/classes/com/sun/jndi/ldap/LdapDnsProviderService.java
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*** 1,7 ****
/*
! * Copyright (c) 2018, 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
--- 1,7 ----
/*
! * 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
*** 35,44 ****
--- 35,46 ----
/**
* 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}.
+ *
+ * <p> 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];
*** 66,107 ****
SecurityConstants.GET_CLASSLOADER_PERMISSION);
}
}
/**
! * Retrieve the singleton static instance of LdapDnsProviderService.
*/
static LdapDnsProviderService getInstance() {
if (service != null) return service;
! synchronized(LOCK) {
if (service != null) return service;
service = new LdapDnsProviderService();
}
return service;
}
/**
! * Retrieve result from the first provider that successfully resolves
* the endpoints. If no results are found when calling installed
* subclasses of {@code LdapDnsProvider} then this method will fall back
* to the {@code DefaultLdapDnsProvider}.
*
* @throws NamingException if the {@code url} in not valid or an error
* occurred while performing the lookup.
*/
LdapDnsProviderResult lookupEndpoints(String url, Hashtable<?,?> env)
throws NamingException
{
- Iterator<LdapDnsProvider> iterator = providers.iterator();
- Hashtable<?, ?> envCopy = new Hashtable<>(env);
LdapDnsProviderResult result = null;
!
while (result == null && iterator.hasNext()) {
result = iterator.next().lookupEndpoints(url, envCopy)
! .filter(r -> r.getEndpoints().size() > 0)
.orElse(null);
}
if (result == null) {
return new DefaultLdapDnsProvider().lookupEndpoints(url, env)
.orElse(new LdapDnsProviderResult("", List.of()));
}
--- 68,110 ----
SecurityConstants.GET_CLASSLOADER_PERMISSION);
}
}
/**
! * Retrieves the singleton instance of LdapDnsProviderService.
*/
static LdapDnsProviderService getInstance() {
if (service != null) return service;
! synchronized (LOCK) {
if (service != null) return service;
service = new LdapDnsProviderService();
}
return service;
}
/**
! * Retrieves result from the first provider that successfully resolves
* the endpoints. If no results are found when calling installed
* subclasses of {@code LdapDnsProvider} then this method will fall back
* to the {@code DefaultLdapDnsProvider}.
*
* @throws NamingException if the {@code url} in not valid or an error
* occurred while performing the lookup.
*/
LdapDnsProviderResult lookupEndpoints(String url, Hashtable<?,?> env)
throws NamingException
{
LdapDnsProviderResult result = null;
! Hashtable<?, ?> envCopy = new Hashtable<>(env);
! synchronized (LOCK) {
! Iterator<LdapDnsProvider> iterator = providers.iterator();
while (result == null && iterator.hasNext()) {
result = iterator.next().lookupEndpoints(url, envCopy)
! .filter(r -> !r.getEndpoints().isEmpty())
.orElse(null);
}
+ }
if (result == null) {
return new DefaultLdapDnsProvider().lookupEndpoints(url, env)
.orElse(new LdapDnsProviderResult("", List.of()));
}
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