content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.master.journal.sink;
  
  import alluxio.proto.journal.Journal.JournalEntry;
  
  /**
   * The interface for the journal to push events.  Implementations must complete these actions
   * quickly, since this is executed in the critical sections of journal writing.
   */
  public interface JournalSink {
    /**
     * Appends a new journal entry written to the journal.
     *
     * @param entry the entry to append
     */
    default void append(JournalEntry entry) {}
  
    /**
     * Signals the sink that the journal is flushed.
     */
    default void flush() {}
  
    /**
     * Signals the sink that the journal is about to shutdown.
     */
    default void beforeShutdown() {}
  }
  