/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at
 * trunk/opendj3/legal-notices/CDDLv1_0.txt
 * or http://forgerock.org/license/CDDLv1.0.html.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at
 * trunk/opendj3/legal-notices/CDDLv1_0.txt.  If applicable,
 * add the following below this CDDL HEADER, with the fields enclosed
 * by brackets "[]" replaced with your own identifying information:
 *      Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 *
 *
 *      Copyright 2009-2010 Sun Microsystems, Inc.
 *      Portions copyright 2011 ForgeRock AS.
 */

package org.forgerock.opendj.ldap;



/**
 * A connection factory provides an interface for obtaining a connection to a
 * Directory Server. Connection factories can be used to wrap other connection
 * factories in order to provide enhanced capabilities in a manner which is
 * transparent to the application. For example:
 * <ul>
 * <li>Connection pooling
 * <li>Load balancing
 * <li>Keep alive
 * <li>Transactional connections
 * <li>Connections to LDIF files
 * <li>Data transformations
 * <li>Logging connections
 * <li>Read-only connections
 * <li>Pre-authenticated connections
 * <li>Recording connections, with primitive roll-back functionality
 * </ul>
 * An application typically obtains a connection from a connection factory,
 * performs one or more operations, and then closes the connection. Applications
 * should aim to close connections as soon as possible in order to avoid
 * resource contention.
 */
public interface ConnectionFactory
{
  /**
   * Asynchronously obtains a connection to the Directory Server associated with
   * this connection factory. The returned {@code FutureResult} can be used to
   * retrieve the completed connection. Alternatively, if a
   * {@code ResultHandler} is provided, the handler will be notified when the
   * connection is available and ready for use.
   *
   * @param handler
   *          The completion handler, or {@code null} if no handler is to be
   *          used.
   * @return A future which can be used to retrieve the connection.
   */
  FutureResult<Connection> getConnectionAsync(
      ResultHandler<? super Connection> handler);



  /**
   * Returns a connection to the Directory Server associated with this
   * connection factory. The connection returned by this method can be used
   * immediately.
   *
   * @return A connection to the Directory Server associated with this
   *         connection factory.
   * @throws ErrorResultException
   *           If the connection request failed for some reason.
   * @throws InterruptedException
   *           If the current thread was interrupted while waiting.
   */
  Connection getConnection() throws ErrorResultException, InterruptedException;
}