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   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
A factory for creating unbound LdapConnection objects managed by LdapConnectionPool.
default logger
     private static final Logger log = LoggerFactory.getLogger(PoolableUnboundConnectionFactory.class);

configuration object for the connection
     private LdapConnectionConfig config;

Creates a new instance of PoolableUnboundConnectionFactory

config the configuration for creating LdapConnections
         this. = config;

     public void activateObject(LdapConnection connectionthrows Exception {
         .debug("activate connection: {}"connection);

     public void destroyObject(LdapConnection connectionthrows Exception {
         .debug("destroy connection: {}"connection);

     public LdapConnection makeObject() throws Exception {
         LdapNetworkConnection connection = .isUseTls()
                 ? new TlsGuardingConnection()
                 : new LdapNetworkConnection();
         .debug("creating new connection: {}"connection);
         return connection;

     public void passivateObject(LdapConnection connectionthrows Exception {
         .debug("passivate connection: {}"connection);

     public boolean validateObject(LdapConnection connection) {
         boolean valid = false;
        if (connection.isConnected()) {
            try {
                valid = connection.lookup(..) != null;
            } catch (LdapException le) {
                .debug("error during connection validation: {}"le.toString());
        .debug("validating connection {}: {}"connectionvalid);
        return valid;

internal helper class that guards the original ldap connection from starting TLS if already started.. this is to ensure that pooled connections can be 'bind()' several times.

    private static class TlsGuardingConnection extends LdapNetworkConnection {
        private boolean tlsStarted;
        private TlsGuardingConnection(LdapConnectionConfig config) {
        public void startTls() throws LdapException {
            if () {
             = true;
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