org.apache.tephra.persist

Interface TransactionLogReader

All Superinterfaces:

AutoCloseable, Closeable

All Known Implementing Classes:

HDFSTransactionLogReaderV1, HDFSTransactionLogReaderV2, HDFSTransactionLogReaderV3

public interface TransactionLogReader
extends Closeable

Represents a reader for TransactionLog instances.

Method Summary

Modifier and Type	Method and Description
TransactionEdit	next() Returns the next TransactionEdit from the log file, based on the current position, or null if the end of the file has been reached.
TransactionEdit	next(TransactionEdit reuse) Populates reuse with the next TransactionEdit, based on the reader's current position in the log file.

Methods inherited from interface java.io.Closeable

close

Method Detail

next

TransactionEdit next()
              throws IOException

Returns the next TransactionEdit from the log file, based on the current position, or null if the end of the file has been reached.

Throws:

IOException

next

TransactionEdit next(TransactionEdit reuse)
              throws IOException

Populates reuse with the next TransactionEdit, based on the reader's current position in the log file.

Parameters:

reuse - The TransactionEdit instance to populate with the log entry data.

Returns:

The TransactionEdit instance, or null if the end of the file has been reached.

Throws:

IOException - If an error is encountered reading the log data.