content: /*
   * 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.kafka.connect.source;
  
  /**
   * Provided to source tasks to allow them to define their own producer transaction boundaries when
   * exactly-once support is enabled.
   */
  public interface TransactionContext {
  
      /**
       * Request a transaction commit after the next batch of records from {@link SourceTask#poll()}
       * is processed.
       */
      void commitTransaction();
  
      /**
       * Request a transaction commit after a source record is processed. The source record will be the
       * last record in the committed transaction.
       * <p>
       * If a task requests that the last record in a batch that it returns from {@link SourceTask#poll()}
       * be committed by invoking this method, and also requests that that same batch be aborted by
       * invoking {@link #abortTransaction()}, the record-based operation (in this case, committing
       * the transaction) will take precedence.
       * @param record the record to commit the transaction after; may not be null.
       */
      void commitTransaction(SourceRecord record);
  
      /**
       * Requests a transaction abort after the next batch of records from {@link SourceTask#poll()}. All of
       * the records in that transaction will be discarded and will not appear in a committed transaction.
       * However, offsets for that transaction will still be committed so than the records in that transaction
       * are not reprocessed. If the data should instead be reprocessed, the task should not invoke this method
       * and should instead throw an exception.
       */
      void abortTransaction();
  
      /**
       * Requests a transaction abort after a source record is processed. The source record will be the
       * last record in the aborted transaction. All of the records in that transaction will be discarded
       * and will not appear in a committed transaction. However, offsets for that transaction will still
       * be committed so that the records in that transaction are not reprocessed. If the data should be
       * reprocessed, the task should not invoke this method and should instead throw an exception.
       * <p>
       * If a task requests that the last record in a batch that it returns from {@link SourceTask#poll()}
       * be aborted by invoking this method, and also requests that that same batch be committed by
       * invoking {@link #commitTransaction()}, the record-based operation (in this case, aborting
       * the transaction) will take precedence.
       * @param record the record to abort the transaction after; may not be null.
       */
      void abortTransaction(SourceRecord record);
  }
  