org.gridgain.grid.persistentstore

Interface SnapshotRegistryTransformer

public interface SnapshotRegistryTransformer

Snapshot file registry transformer. The authenticity of snapshot is provided by means of custom transformer class which instance may be provided in the snapshot configuration. The transformer instance is passed the content of the file registry and the former generates the verification code which is then appended to the file registry itself. The verification code is passed back to the transformer when the snapshot is restored to verify its authenticity.

Method Summary

Modifier and Type	Method and Description
default String	getTransformerName() Gets the name of the transformer algorithm and possibly the essential details on its parameters, if any.
byte[]	transform(byte[] data) Compute the verification data over the content of snapshot file registry.
void	verify(byte[] data, byte[] verificationData) Validate the verification data computed earlier against the actual content of snapshot file registry.

Method Detail

transform

byte[] transform(byte[] data)
          throws Exception

Compute the verification data over the content of snapshot file registry.

Parameters:

data - Content of snapshot file registry.

Returns:

Verification data.

Throws:

Exception - If failed.

verify

void verify(byte[] data,
            byte[] verificationData)
     throws Exception

Validate the verification data computed earlier against the actual content of snapshot file registry.

Parameters:

data - Actual content of snapshot file registry, except for verification data.

verificationData - Verification data computed on snapshot creation.

Throws:

Exception - If verification fails.

getTransformerName

default String getTransformerName()

Gets the name of the transformer algorithm and possibly the essential details on its parameters, if any. All nodes must agree on this value before the snapshot is created or restored.

Returns:

The name of transformer algorithm.