/*
    * 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
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * 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.
   */
  package org.apache.logging.log4j.nosql.appender.couchdb;
  
  import java.util.Map;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import org.apache.logging.log4j.core.appender.AppenderLoggingException;
  import org.apache.logging.log4j.nosql.appender.DefaultNoSqlObject;
  import org.apache.logging.log4j.nosql.appender.NoSqlConnection;
  import org.apache.logging.log4j.nosql.appender.NoSqlObject;
  import org.apache.logging.log4j.util.Strings;
  import org.lightcouch.CouchDbClient;
  import org.lightcouch.Response;
  
  /**
   * The Apache CouchDB implementation of {@link NoSqlConnection}.
   */
  public final class CouchDbConnection implements NoSqlConnection<Map<String, Object>, DefaultNoSqlObject> {
      private final CouchDbClient client;
      private final AtomicBoolean closed = new AtomicBoolean(false);
  
      public CouchDbConnection(final CouchDbClient client) {
          this.client = client;
      }
  
      @Override
      public DefaultNoSqlObject createObject() {
          return new DefaultNoSqlObject();
      }
  
      @Override
      public DefaultNoSqlObject[] createList(final int length) {
          return new DefaultNoSqlObject[length];
      }
  
      @Override
      public void insertObject(final NoSqlObject<Map<String, Object>> object) {
          try {
              final Response response = this.client.save(object.unwrap());
              if (Strings.isNotEmpty(response.getError())) {
                  throw new AppenderLoggingException("Failed to write log event to CouchDB due to error: " +
                          response.getError() + '.');
              }
          } catch (final Exception e) {
              throw new AppenderLoggingException("Failed to write log event to CouchDB due to error: " + e.getMessage(),
                      e);
          }
      }
  
      @Override
      public void close() {
          if (this.closed.compareAndSet(false, true)) {
              this.client.shutdown();
          }
      }
  
      @Override
      public boolean isClosed() {
          return this.closed.get();
      }
  }