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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements. See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache license, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License. You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the license for the specific language governing permissions and
15   * limitations under the license.
16   */
17  package org.apache.logging.log4j.core.appender.db.nosql;
18  
19  /**
20   * Implementations of this class are plugins for configuring the {@link NoSQLAppender} with the proper provider
21   * (MongoDB, etc.).
22   * 
23   * @param <C> Specifies which implementation of {@link NoSQLConnection} this provider provides.
24   */
25  public interface NoSQLProvider<C extends NoSQLConnection<?, ? extends NoSQLObject<?>>> {
26      /**
27       * Obtains a connection from this provider. The concept of a connection in this case is not strictly an active
28       * duplex UDP or TCP connection to the underlying database. It can be thought of more as a gateway, a path for
29       * inserting objects that may use a persistent connection or may use HTTP web service calls, etc.
30       *
31       * @return a connection that can be used to create and persist objects to this database.
32       * @see NoSQLConnection
33       */
34      C getConnection();
35  
36      /**
37       * All implementations must override {@link Object#toString()} to provide information about the provider
38       * configuration (obscuring passwords with one-way hashes).
39       *
40       * @return the string representation of this NoSQL provider.
41       */
42      @Override
43      String toString();
44  }