Network Working Group Rob Weltman
INTERNET-DRAFT Netscape Communications Corp.
Intended Category: Standards Track Christine Tomlinson
Innosoft International, Inc.
Miodrag Kekic
Netscape Communications Corp.
January 3, 2000
The Java LDAP Application Program Interface Asynchronous Extension
draft-ietf-ldapext-ldap-java-api-asynch-ext-04.txt
Status of this Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Task Force
(IETF), its areas, and its working groups. Note that other groups
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The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html.
Abstract
This document defines asynchronous extensions to the java language
application program interface to the lightweight directory access
protocol (LDAP) defined in [JAVALDAP].
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1. Introduction.....................................................4
2. Overview of the LDAP asynchronous extension classes..............4
2.1 Interfaces.......................................................4
2.2 Classes..........................................................4
3. Overview of extended asynchronous LDAP API use...................5
4. The java LDAP asynchronous extension classes.....................5
4.1 public interface LDAPAsynchronousConnection......................5
4.1.1 abandon.......................................................6
4.1.2 add...........................................................6
4.1.3 bind..........................................................6
4.1.4 compare.......................................................7
4.1.5 delete........................................................8
4.1.6 modify........................................................8
4.1.7 rename........................................................9
4.1.8 search.......................................................10
4.2 public class LDAPExtendedResponse extends LDAPResponse..........11
4.2.1 getID........................................................11
4.2.2 getValue.....................................................11
4.3 public class LDAPMessage........................................11
4.3.1 getControls..................................................11
4.3.2 getMessageID.................................................12
4.3.3 getType......................................................12
4.4 public abstract class LDAPResponse extends LDAPMessage..........12
4.4.1 getErrorMessage..............................................12
4.4.2 getMatchedDN.................................................12
4.4.3 getReferrals.................................................13
4.4.4 getResultCode................................................13
4.5 public class LDAPResponseListener...............................13
4.5.1 getMessageIDs................................................13
4.5.2 getResponse..................................................13
4.5.3 isResponseReceived...........................................13
4.5.4 merge........................................................13
4.6 public class LDAPSearchListener.................................13
4.6.1 getMessageIDs................................................14
4.6.2 getResponse..................................................14
4.6.3 isResponseReceived...........................................14
4.6.4 merge........................................................14
4.7 public class LDAPSearchResult extends LDAPMessage...............14
4.7.1 getEntry.....................................................14
4.8 public class LDAPSearchResultReference extends LDAPMessage......14
4.8.1 getUrls......................................................14
5. Bibliography....................................................15
6. Authors' Addresses..............................................16
7. Appendix A - Sample java LDAP asynchronous extension programs...17
8. Appendix B - Changes from draft-ietf-ldapext-ldap-java-api-asynch-
ext-02.txt............................................................20
8.1 LDAPMessage.....................................................20
8.2 LDAPExtendedResponse............................................20
8.3 LDAPSearchListener..............................................21
8.4 LDAPResponseListener............................................21
9. Appendix C - Changes from ldap-java-api-asynch-ext-01.txt.......21
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9.1 LDAPResponseListener............................................21
10. Appendix D - Changes from ldap-java-api-asynch-ext-00.txt.......21
10.1 LDAPAsynchronousConnection......................................21
10.2 LDAPMessage.....................................................21
10.3 LDAPResponse....................................................21
10.4 LDAPResponseListener............................................21
10.5 LDAPSearchListener..............................................21
10.6 Appendix........................................................21
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1. Introduction
The LDAP class library defined in [JAVALDAP] is designed to provide
powerful, yet simple, access to LDAP directory services. It defines
a synchronous interface to LDAP, with support for partial results on
searching, to suit a wide variety of applications. However, in some
cases it is advantageous for a programmer to access the underlying
asynchronous mechanisms close to the protocol layer. This document
describes an extension interface - LDAPAsynchronousConnection - and
supporting classes.
The public class methods are described in detail, followed by an
appendix that provides some example code demonstrating the use of the
classes.
2. Overview of the LDAP asynchronous extension classes
The central element is the interface LDAPAsynchronousConnection. It
provides methods to authenticate to an LDAP server, as well as
methods to search for, modify, compare, and delete entries in the
directory.
Unlike the LDAPv3 interface defined in [JAVALDAP],
LDAPAsynchronousConnection returns a listener object and may also
take a listener object as input. The listener is a message queue
associated with the request, and it is the responsibility of the
client to read messages out of the queue and process them.
Messages retrieved from an LDAPResponseListener are result objects
derived from LDAPResponse. Messages retrieved from an
LDAPSearchListener are either result objects derived from
LDAPResponse, search results, or search result references.
None of the ancillary asynchronous classes are intended to be
instantiated by a client, so they lack public constructors.
2.1 Interfaces
LDAPAsynchronousConnection Encapsulates a connection to an LDAP
server, providing access to the input queue
for messages received.
2.2 Classes
LDAPMessage Base class for LDAP request and response
messages.
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LDAPResponse Class representing a message received from an
LDAP server in response to a request. It
extends LDAPMessage.
LDAPExtendedResponse The response returned by an LDAP server on an
extended operation request. It extends
LDAPResponse.
LDAPSearchResult A single search result. It extends
LDAPMessage.
LDAPSearchResultReference A continuation reference from a search
operation. It extends LDAPMessage.
LDAPResponseListener Low-level mechanism for processing messages
received from a server.
LDAPSearchListener Low-level mechanism for queueing search
results received from a server.
3. Overview of extended asynchronous LDAP API use
An application generally uses the asynchronous methods as follows:
- Construct an LDAPAsynchronousConnection. Initialize an LDAP
session with a directory server.
- Invoke an LDAP operation, passing null for LDAPResponseListener
(or LDAPSearchListener for a search operation). The
LDAPAsynchronousConnection returns a new LDAPResponseListener
(or LDAPSearchListener for a search operation).
- Loop on reading from the listener object, which blocks until
there is a response available, until the operation has
completed, and interpret the results.
An LDAPResponseListener may be shared between operations, for
multiplexing the results. In this case, the object returned on one
operation is passed in to one or more other operations, rather than
passing in null.
The following sections describe the asynchronous extension classes in
more detail.
4. The java LDAP asynchronous extension classes
4.1 public interface LDAPAsynchronousConnection
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LDAPAsynchronousConnection provides access to the message queue in a
connection to a server, allowing clients to multiplex results from
multiple connections or do low-level processing of incoming messages.
4.1.1 abandon
public void abandon(int id)
public void abandon(LDAPsearchListener listener)
Abandons one or all search operations for a listener.
Parameters are:
id The ID of the operation to abandon. The ID may be
obtained from the search listener for the
operation.
listener Handler returned for messages returned on a
search request. All operations in progress which
are managed by the listener are abandoned.
4.1.2 add
public LDAPResponseListener add(LDAPEntry entry,
LDAPResponseListener listener)
throws LDAPException
public LDAPResponseListener add(LDAPEntry entry,
LDAPResponseListener listener,
LDAPConstraints cons)
throws LDAPException
Adds an entry to the directory.
Parameters are:
entry LDAPEntry object specifying the distinguished
name and attributes of the new entry.
listener Handler for messages returned from a server in
response to this request. If it is null, a
listener object is created internally.
cons Constraints specific to the operation.
4.1.3 bind
public LDAPResponseListener bind(String dn,
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String passwd,
LDAPResponseListener listener)
throws LDAPException
public LDAPResponseListener bind(String dn,
String passwd,
LDAPResponseListener listener,
LDAPConstraints cons)
throws LDAPException
Authenticates to the LDAP server (that the object is currently
connected to) using the specified name and password. If the object
has been disconnected from an LDAP server, this method attempts to
reconnect to the server. If the object had already authenticated, the
old authentication is discarded.
Parameters are:
dn If non-null and non-empty, specifies that the
connection and all operations through it should
be authenticated with dn as the distinguished
name.
passwd If non-null and non-empty, specifies that the
connection and all operations through it should
be authenticated with dn as the distinguished
name and passwd as password.
listener Handler for messages returned from a server in
response to this request. If it is null, a
listener object is created internally.
cons Constraints specific to the operation.
4.1.4 compare
public LDAPResponseListener compare(String dn,
LDAPAttribute attr,
LDAPResponseListener listener)
throws LDAPException
public LDAPResponseListener compare(String dn,
LDAPAttribute attr,
LDAPResponseListener listener,
LDAPConstraints cons)
throws LDAPException
Compare an attribute value with one in the directory.
Parameters are:
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dn The distinguished name of the entry containing an
attribute to compare.
attr An attribute to compare.
listener Handler for messages returned from a server in
response to this request. If it is null, a
listener object is created internally.
cons Constraints specific to the operation.
4.1.5 delete
public LDAPResponseListener delete(String dn
LDAPResponseListener listener)
throws LDAPException
public LDAPResponseListener delete(String dn,
LDAPResponseListener listener,
LDAPConstraints cons)
throws LDAPException
Deletes the entry for the specified DN from the directory.
Parameters are:
dn Distinguished name of the entry to modify.
listener Handler for messages returned from a server in
response to this request. If it is null, a
listener object is created internally.
cons Constraints specific to the operation.
4.1.6 modify
public LDAPResponseListener modify(String dn,
LDAPModification mod,
LDAPResponseListener listener)
throws LDAPException
public LDAPResponseListener modify(String dn,
LDAPModification mod,
LDAPResponseListener listener,
LDAPConstraints cons)
throws LDAPException
Makes a single change to an existing entry in the directory (for
example, changes the value of an attribute, adds a new attribute
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value, or removes an existing attribute value).
The LDAPModification object specifies both the change to be made and
the LDAPAttribute value to be changed.
public LDAPResponseListener modify(String dn,
LDAPModificationSet mods,
LDAPResponseListener listener)
throws LDAPException
public LDAPResponseListener modify(String dn,
LDAPModificationSet mods,
LDAPResponseListener listener,
LDAPConstraints cons)
throws LDAPException
Makes a set of changes to an existing entry in the directory (for
example, changes attribute values, adds new attribute values, or
removes existing attribute values).
Parameters are:
dn Distinguished name of the entry to modify.
mod A single change to be made to the entry.
mods A set of changes to be made to the entry.
listener Handler for messages returned from a server in
response to this request. If it is null, a
listener object is created internally.
cons Constraints specific to the operation.
4.1.7 rename
public LDAPResponseListener rename(String dn,
String newRdn,
boolean deleteOldRdn,
LDAPResponseListener listener)
throws LDAPException
public LDAPResponseListener rename(String dn,
String newRdn,
boolean deleteOldRdn,
LDAPResponseListener listener,
LDAPConstraints cons)
throws LDAPException
Renames an existing entry in the directory.
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Parameters are:
dn Current distinguished name of the entry.
newRdn New relative distinguished name for the entry.
deleteOldRdn If true, the old name is not retained as an
attribute value.
listener Handler for messages returned from a server in
response to this request. If it is null, a
listener object is created internally.
cons Constraints specific to the operation.
4.1.8 search
public LDAPSearchListener search(String base,
int scope,
String filter,
String attrs[],
boolean typesOnly,
LDAPSearchListener listener)
throws LDAPException
Performs the search specified by the parameters.
public LDAPSearchListener search(String base,
int scope,
String filter,
String attrs[],
boolean typesOnly,
LDAPSearchListener listener,
LDAPConstraints cons)
throws LDAPException
Performs the search specified by the parameters, also allowing
specification of constraints for the search (such as the maximum
number of entries to find or the maximum time to wait for search
results).
Parameters are:
base The base distinguished name to search from.
scope The scope of the entries to search. The following
are the valid options:
LDAPv2.SCOPE_BASE Search only the base DN
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LDAPv2.SCOPE_ONE Search only entries under the
base DN
LDAPv2.SCOPE_SUB Search the base DN and all
entries
within its subtree
filter Search filter specifying the search criteria, as
defined in [FILTERS].
attrs Names of attributes to retrieve.
typesOnly If true, returns the names but not the values of
the attributes found. If false, returns the
names and values for attributes found.
listener Handler for messages returned from a server in
response to this request. If it is null, a
listener object is created internally.
cons Constraints specific to the search.
4.2 public class LDAPExtendedResponse extends LDAPResponse
An LDAPExtendedResponse object encapsulates a server response to an
extended operation request.
4.2.1 getID
public String getID()
Returns the OID of the response.
4.2.2 getValue
public byte[] getValue()
Returns the raw bytes of the value part of the response.
4.3 public class LDAPMessage
Base class for LDAP request and response messages.
4.3.1 getControls
public LDAPControl[] getControls()
Returns any controls in the message.
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4.3.2 getMessageID
public int getMessageID()
Returns the message ID.
4.3.3 getType
public int getType()
Returns the LDAP operation type of the message. The type is one of
the following:
public final static int BIND_REQUEST = 0;
public final static int BIND_RESPONSE = 1;
public final static int UNBIND_REQUEST = 2;
public final static int SEARCH_REQUEST = 3;
public final static int SEARCH_RESPONSE = 4;
public final static int SEARCH_RESULT = 5;
public final static int MODIFY_REQUEST = 6;
public final static int MODIFY_RESPONSE = 7;
public final static int ADD_REQUEST = 8;
public final static int ADD_RESPONSE = 9;
public final static int DEL_REQUEST = 10;
public final static int DEL_RESPONSE = 11;
public final static int MODIFY_RDN_REQUEST = 12;
public final static int MODIFY_RDN_RESPONSE = 13;
public final static int COMPARE_REQUEST = 14;
public final static int COMPARE_RESPONSE = 15;
public final static int ABANDON_REQUEST = 16;
public final static int SEARCH_RESULT_REFERENCE = 19;
public final static int EXTENDED_REQUEST = 23;
public final static int EXTENDED_RESPONSE = 24;
4.4 public abstract class LDAPResponse extends LDAPMessage
Represents the response to a particular LDAP operation.
4.4.1 getErrorMessage
public String getErrorMessage()
Returns any error message in the response.
4.4.2 getMatchedDN
public String getMatchedDN()
Returns the partially matched DN field, if any, in a server response.
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4.4.3 getReferrals
public String[] getReferrals()
Returns all referrals, if any, in a server response.
4.4.4 getResultCode
public int getResultCode()
Returns the result code in a server response, as defined in [LDAPv3].
4.5 public class LDAPResponseListener
Represents the message queue associated with a particular LDAP
operation or operations.
4.5.1 getMessageIDs
public int[] getMessageIDs()
Returns the message IDs for all outstanding requests. The last ID in
the array is the messageID of the latest submitted request.
4.5.2 getResponse
public LDAPResponse getResponse()
Blocks until a response is available, or until all operations
associated with the object have completed or been canceled, and
returns the response.
4.5.3 isResponseReceived
public boolean isResponseReceived()
Reports true if a response has been received from the server.
4.5.4 merge
public void merge(LDAPResponseListener listener2)
Merges two response listeners. Moves/appends the content from another
listener to this one.
4.6 public class LDAPSearchListener
An LDAPSearchListener manages search results and references returned
on one or more search requests.
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4.6.1 getMessageIDs
public int[] getMessageIDs()
Returns the message IDs for all outstanding requests. The last ID in
the array is the messageID of the latest submitted request.
4.6.2 getResponse
public LDAPMessage getResponse()
Blocks until a response is available, or until all operations
associated with the object have completed or been canceled, and
returns the response. The response may be a search result, a search
reference, a search response, or null (if there are no more
outstanding requests). LDAPException is thrown on network errors.
4.6.3 isResponseReceived
public boolean isResponseReceived()
Reports true if a response has been received from the server.
4.6.4 merge
public void merge(LDAPSearchListener listener2)
Merges two search listeners. Moves/appends the content from another
search listener to this one.
4.7 public class LDAPSearchResult extends LDAPMessage
An LDAPSearchResult object encapsulates a single search result.
4.7.1 getEntry
public LDAPEntry getEntry()
Returns the entry of a server search response.
4.8 public class LDAPSearchResultReference extends LDAPMessage
An LDAPSearchResultReference object encapsulates a continuation
reference from a search operation.
4.8.1 getUrls
public String[] getUrls()
Returns any URLs in the object.
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5. Bibliography
[LDAPv3] M. Wahl, T. Howes, S. Kille, "Lightweight Directory Access
Protocol (v3)", RFC 2251, December 1997.
[JAVALDAP] R. Weltman, C. Tomlinson, T. Howes, M. Smith, "The Java
LDAP Application Program Interface", Internet Draft draft-ietf-
ldapext-ldap-java-api-07.txt, October 1999.
[FILTERS] T. Howes, "A String Representation of LDAP Search
Filters," RFC 1960, June 1996.
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6. Authors' Addresses
Rob Weltman
Netscape Communications Corp.
501 E. Middlefield Rd.
Mountain View, CA 94043
USA
+1 650 937-3301
rweltman@netscape.com
Christine Tomlinson
Innosoft International, Inc.
8911 Capital of Texas Highway
Suite 4140
Austin, TX US 78759
+1 512 231 1600
christine.tomlinson@innosoft.com
Miodrag Kekic
Netscape Communications Corp.
501 E. Middlefield Rd.
Mountain View, CA 94043
USA
+1 650 937-5663
miodrag@netscape.com
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7. Appendix A - Sample java LDAP asynchronous extension programs
import netscape.ldap.*;
import java.util.*;
/* Assume a class LDAPAsynch which extends LDAPConnection and
implements LDAPAsynchronousConnection */
public class SearchJensen {
public static void main( String[] args ) {
try {
LDAPAsynch ld = new LDAPAsynch();
/* Connect to server */
String MY_HOST = "localhost";
int MY_PORT = 389;
ld.connect( MY_HOST, MY_PORT );
/* Asynchronous authentication */
LDAPResponseListener r =
ld.bind( "uid=admin, o=Airius.com",
"password", null );
/* Do something else, just to show that we're not
blocked yet */
System.out.println( "Started authenticating" );
/* Wait until it completes*/
LDAPResponse response = r.getResponse();
int resultCode = response.getResultCode();
if (resultCode != LDAPException.SUCCESS) {
throw new LDAPException ("error result", resultCode,
response.getErrorMessage(),
response.getMatchedDN());
}
/* search for all entries with surname of Jensen */
String MY_FILTER = "sn=Jensen";
String MY_SEARCHBASE = "o=Ace Industry, c=US";
LDAPSearchListener l =
ld.search( MY_SEARCHBASE,
ld.SCOPE_ONE,
MY_FILTER,
null,
false,
null,
(LDAPSearchListener)null );
/* Loop on results until finished */
LDAPMessage msg;
while( (msg = l.getResponse()) != null ) {
if ( msg instanceof LDAPSearchResultReference ) {
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String[] urls =
((LDAPSearchResultReference)msg).getUrls();
// Do something with the referrals...
} else if ( msg instanceof LDAPSearchResult ) {
LDAPEntry entry =
((LDAPSearchResult)msg).getEntry();
// The rest of the processing is the same as for
// a synchronous search
System.out.println( entry.getDN() );
} else {
// A search response
LDAPResponse res = (LDAPResponse)msg;
int status = res.getResultCode();
if ( status == LDAPException.SUCCESS ) {
// Nothing to do
} else {
String err =
LDAPException.errorCodeToString(status);
throw new LDAPException(
err,
status,
res.getErrorMessage(),
res.getMatchedDN() );
}
}
}
} catch ( LDAPException e ) {
System.err.println( e.toString() );
}
/* Done, so disconnect */
if ( ld.isConnected() ) {
ld.disconnect();
}
}
}
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import netscape.ldap.*;
import java.util.*;
/* This example multiplexes the input from three different servers */
public class MultiplexServers {
public static void main( String[] args )
{
try {
LDAPAsynch[] ld = new LDAPAsynch[3];
String[] hosts = { "foo1", "foo2", "foo3" };
int[] ports = { 389, 389, 2018 }
String[] bases =
{ "o=Airius.com", "o=Acme.com", "dc=Acme,dc=com" };
/* search for all entries with surname of Jensen */
String MY_FILTER = "sn=Jensen";
for( int i = 0; i < ld.length; i++ ) {
ld[i] = new LDAPAsynch();
/* Connect to server */
ld[i].connect( hosts[i], ports[i] );
}
/* Get a response listener for one search */
LDAPSearchListener l =
ld[0].search( bases[0],
ld.SCOPE_SUB,
MY_FILTER,
null,
false,
(LDAPSearchListener)null );
/* Share the listener */
for( i = 1; i < ld.length; i++ ) {
ld[i].search( bases[i],
ld[i].SCOPE_SUB,
MY_FILTER,
null,
false,
l );
}
/* Loop on results until finished */
LDAPMessage msg;
while( (msg = l.getResponse()) != null ) {
/* The rest is the same as in the previous example */
/* ... */
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import netscape.ldap.*;
import java.util.*;
/* This example multiplexes the input from three searches in
different subtrees of the same server */
public class MultiplexTrees {
public static void main( String[] args )
{
try {
LDAPAsynch ld = new LDAPAsynch();
/* Connect to server */
String MY_HOST = "localhost";
int MY_PORT = 389;
ld.connect( MY_HOST, MY_PORT );
String MY_FILTER = "sn=Jensen";
String[] bases =
{ "o=Airius.com", "o=Acme.com", "dc=Acme,dc=com" };
/* Get a response listener for one search */
LDAPSearchListener l =
ld.search( bases[0],
ld.SCOPE_SUB,
MY_FILTER,
null,
false,
(LDAPSearchListener)null );
/* Share the listener */
for( i = 1; i < bases.length; i++ ) {
ld.search( bases[i],
ld.SCOPE_SUB,
MY_FILTER,
null,
false,
l );
}
/* The rest is the same as in the MultiplexServers
example */
/* ... */
8. Appendix B - Changes from draft-ietf-ldapext-ldap-java-api-asynch-
ext-03.txt
8.1 Standards track
Added intended category to first page header.
8.2 LDAPResponseListener and LDAPSearchListener
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Clarified that the last ID in the array returned by getMessageIDs is
the messageID of the latest submitted request.
9. Appendix C - Changes from draft-ietf-ldapext-ldap-java-api-asynch-
ext-02.txt
9.1 LDAPMessage
Changed getID() to getMessageID() (4.3.2).
9.2 LDAPExtendedResponse
Changed getOID() to getID() (4.2.1).
9.3 LDAPSearchListener
Changed getIDs() to getMessageIDs() (4.6.1).
9.4 LDAPResponseListener
Changed getIDs() to getMessageIDs() (4.5.1).
10. Appendix D - Changes from ldap-java-api-asynch-ext-01.txt
10.1 LDAPResponseListener
Added merge(), which was already present in LDAPSearchListener in the
previous draft.
11. Appendix D - Changes from ldap-java-api-asynch-ext-00.txt
11.1 LDAPAsynchronousConnection
Added abandon(), compare(), and unbind(). Removed bind() method for
SASL. Removed static search methods.
11.2 LDAPMessage
No longer abstract. Added getID().
11.3 LDAPResponse
No longer abstract.
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11.4 LDAPResponseListener
Added getIDs().
11.5 LDAPSearchListener
No longer extends LDAPResponseListener. Removed getSearchResult(),
added getIDs(), getResponse(), isResponseReceived(), and merge().
11.6 Appendix
Updated sample programs to reflect API changes.
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