alluxio.master.journal.noop

Class NoopJournalReader

java.lang.Object

alluxio.master.journal.noop.NoopJournalReader

All Implemented Interfaces:

JournalReader, Closeable, AutoCloseable

public class NoopJournalReader
extends Object
implements JournalReader

Implementation of JournalReader that does nothing.

Constructor Summary

Constructors

Constructor and Description
NoopJournalReader() Creates a new instance of NoopJournalReader.

Method Summary

Modifier and Type	Method and Description
void	close()
long	getNextSequenceNumber() Gets the the sequence number of the next journal log entry to read.
Journal.JournalEntry	read() Reads an entry from the journal.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NoopJournalReader

public NoopJournalReader()

Creates a new instance of NoopJournalReader.

Method Detail

read

public Journal.JournalEntry read()
                          throws IOException,
                                 InvalidJournalEntryException

Description copied from interface: JournalReader

Reads an entry from the journal. Return null if there is no more entry left.

Specified by:

read in interface JournalReader

Returns:

the journal entry, null if no more entry left

Throws:

InvalidJournalEntryException - if the journal entry is invalid (e.g. corrupted entry)

IOException

getNextSequenceNumber

public long getNextSequenceNumber()

Description copied from interface: JournalReader

Gets the the sequence number of the next journal log entry to read. This method is valid no matter whether this JournalReader is closed or not.

Specified by:

getNextSequenceNumber in interface JournalReader

Returns:

the next sequence number

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException