solr/contrib/dataimporthandler/src/java/org/apache/solr/handler/dataimport/DIHWriter.java

/*
 * 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.solr.handler.dataimport;
import java.util.Map;
import java.util.Set;

import org.apache.solr.common.SolrInputDocument;

/**
 * @lucene.experimental
 *
 */
public interface DIHWriter {

  /**
   * <p>
   *  If this writer supports transactions or commit points, then commit any changes,
   *  optionally optimizing the data for read/write performance
   * </p>
   */
  public void commit(boolean optimize);

  /**
   * <p>
   *  Release resources used by this writer.  After calling close, reads &amp; updates will throw exceptions.
   * </p>
   */
  public void close();

  /**
   * <p>
   *  If this writer supports transactions or commit points, then roll back any uncommitted changes.
   * </p>
   */
  public void rollback();

  /**
   * <p>
   *  Delete from the writer's underlying data store based the passed-in writer-specific query. (Optional Operation)
   * </p>
   */
  public void deleteByQuery(String q);

  /**
   * <p>
   *  Delete everything from the writer's underlying data store
   * </p>
   */
  public void doDeleteAll();

  /**
   * <p>
   *  Delete from the writer's underlying data store based on the passed-in Primary Key
   * </p>
   */
  public void deleteDoc(Object key);



  /**
   * <p>
   *  Add a document to this writer's underlying data store.
   * </p>
   * @return true on success, false on failure
   */
  public boolean upload(SolrInputDocument doc);



  /**
   * <p>
   *  Provide context information for this writer.  init() should be called before using the writer.
   * </p>
   */
  public void init(Context context) ;


  /**
   * <p>
   *  Specify the keys to be modified by a delta update (required by writers that can store duplicate keys)
   * </p>
   */
  public void setDeltaKeys(Set<Map<String, Object>> deltaKeys) ;

}