com.bigdata.io.writecache

Interface IBackingReader

All Known Implementing Classes:

RWStore, WORMStrategy

public interface IBackingReader

A backing reader can be provided to a WriteCacheService which can use the readRaw callback method as part of an encapsulated caching strategy.

Author:

Martyn Cutcher

Method Summary

Methods

Modifier and Type	Method and Description
ByteBuffer	readRaw(long fileOffset, ByteBuffer dst) Read on the backing file, installing the record into the caller's buffer.

Method Detail

readRaw

ByteBuffer readRaw(long fileOffset,
                 ByteBuffer dst)

Read on the backing file, installing the record into the caller's buffer. Buffer.remaining() bytes will be read into the caller's buffer, starting at the specified offset in the backing file.

Parameters:

fileOffset - The offset of the first byte to be read (absolute offset on the backing file).

dst - Where to put the data. Bytes will be written at position until limit.

Returns:

The caller's buffer, prepared for reading back the installed record.