Class LdapDnsProvider

public abstract class LdapDnsProvider
extends Object

Service-provider class for DNS lookups when performing LDAP operations.

An LDAP DNS provider is a concrete subclass of this class that has a zero-argument constructor. LDAP DNS providers are located using the ServiceLoader facility, as specified by InitialDirectContext. The ServiceLoader is used to create and register implementations of LdapDnsProvider.

An LDAP DNS provider can be used in environments where the default DNS resolution mechanism is not sufficient to accurately pinpoint the correct LDAP servers needed to perform LDAP operations. For example, in an environment containing a mix of ldap and ldaps servers you may want the LdapContext to query ldaps servers only.

Constructors

Modifier Constructor Description
protected LdapDnsProvider()

Creates a new instance of LdapDnsProvider.

Methods

Modifier and Type Method Description
abstract Optional<LdapDnsProviderResult> lookupEndpoints​(String url, Map<?,​?> env)

Lookup the endpoints and domain name for the given Context provider URL and environment.

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructors

LdapDnsProvider

protected LdapDnsProvider()

Creates a new instance of LdapDnsProvider.

Throws:
SecurityException - if a security manager is present and its checkPermission method doesn't allow the RuntimePermission("ldapDnsProvider").

Methods

lookupEndpoints

public abstract Optional<LdapDnsProviderResult> lookupEndpoints(String url,
                                                                Map<?,​?> env)
                                                         throws NamingException

Lookup the endpoints and domain name for the given Context provider URL and environment. The resolved endpoints and domain name are returned as an LdapDnsProviderResult.

An endpoint is a String representation of an LDAP URL which points to an LDAP server to be used for LDAP operations. The syntax of an LDAP URL is defined by RFC 2255: The LDAP URL Format.

Parameters:
url - The Context provider URL
env - The Context environment.
Returns:
an LdapDnsProviderResult or empty Optional if the lookup fails.
Throws:
NamingException - if the url is not valid or an error occurred while performing the lookup.
NullPointerException - if either url or env are null.

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Documentation extracted from Debian's OpenJDK Development Kit package.
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https://docs.oracle.com/en/java/javase/11/docs/api/jdk.naming.ldap/com/sun/jndi/ldap/spi/LdapDnsProvider.html