com.mckoi.database
Interface BlobStoreInterface

public interface BlobStoreInterface

A very restricted interface for accessing a blob store. This is used by a MasterTableDataSource implementation to query and resolve blob information.

Author:

Tobias Downer

Method Summary

void	establishReference(long reference_id) Tells the BlobStore that a static reference has been established in a table to the blob referenced by the given id.
Ref	getLargeObject(long reference_id) Given a large object reference identifier, generates a Ref implementation that provides access to the information in the large object.
void	releaseReference(long reference_id) Tells the BlobStore that a static reference has been released to the given blob.

Method Detail

getLargeObject

Ref getLargeObject(long reference_id)
                   throws java.io.IOException

Given a large object reference identifier, generates a Ref implementation that provides access to the information in the large object. The Ref implementation returned by this object is a read-only static object. This may return either a BlobRef or a ClobRef object depending on the type of the object.

Throws:

java.io.IOException

establishReference

void establishReference(long reference_id)

Tells the BlobStore that a static reference has been established in a table to the blob referenced by the given id. This is used to count references to a blob, and possibly clean up a blob if there are no references remaining to it.

releaseReference

void releaseReference(long reference_id)

Tells the BlobStore that a static reference has been released to the given blob. This would typically be called when the row in the database is removed.