com.bigdata.ha

Interface HAReadGlue

All Superinterfaces:

Remote

All Known Subinterfaces:

HAGlue

All Known Implementing Classes:

AbstractJournal.BasicHA

public interface HAReadGlue
extends Remote

A Remote interface supporting low-level reads against persistent data from a quorum member. This interface is used to handle bad reads, which are identified by a checksum error when reading on the local disk. To handle a bad read, the quorum member reads on a different member of the same quorum.

Version:

$Id$

Author:

Bryan Thompson

See Also:

QuorumRead

Method Summary

Methods

Modifier and Type	Method and Description
Future<IHAReadResponse>	readFromDisk(IHAReadRequest readMessage) Read a record an IRawStore managed by the service.

Method Detail

readFromDisk

Future<IHAReadResponse> readFromDisk(IHAReadRequest readMessage)
                                     throws IOException

Read a record an IRawStore managed by the service. Services MUST NOT refer this message to another service. If the read can not be satisfied, for example because the IRawStore has been released or because there is a checksum error when reading on the IRawStore, then that exception should be thrown back to the caller.

Parameters:

readMessage - The IHAReadRequest.

Returns:

The Future of an operation which evaluated to the desired record.

Throws:

IOException

See Also:

QuorumRead.readFromQuorum(UUID, long)