/*
* 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.journalv0;
import alluxio.proto.journal.Journal.JournalEntry;
import java.io.IOException;
/**
* This input stream retrieves {@link JournalEntry} from journal checkpoints and journal logs.
*/
public interface JournalInputStream extends AutoCloseable {
/**
* Reads the next journal entry.
*
* @return the next {@link JournalEntry} in the stream, or null if the are no more entries
*/
JournalEntry read() throws IOException;
/**
* Closes the stream.
*/
void close() throws IOException;
/**
* @return the sequence number of the latest journal entry seen in the stream
*/
long getLatestSequenceNumber();
}