org.apache.zookeeper.server.persistence
Interface SnapShot

All Known Implementing Classes:

FileSnap

public interface SnapShot

snapshot interface for the persistence layer. implement this interface for implementing snapshots.

Method Summary

void	close() free resources from this snapshot immediately
long	deserialize(DataTree dt, java.util.Map<java.lang.Long,java.lang.Integer> sessions) deserialize a data tree from the last valid snapshot and return the last zxid that was deserialized
java.io.File	findMostRecentSnapshot() find the most recent snapshot file
void	serialize(DataTree dt, java.util.Map<java.lang.Long,java.lang.Integer> sessions, java.io.File name) persist the datatree and the sessions into a persistence storage

Method Detail

deserialize

long deserialize(DataTree dt,
                 java.util.Map<java.lang.Long,java.lang.Integer> sessions)
                 throws java.io.IOException

deserialize a data tree from the last valid snapshot and return the last zxid that was deserialized

Parameters:

dt - the datatree to be deserialized into

sessions - the sessions to be deserialized into

Returns:

the last zxid that was deserialized from the snapshot

Throws:

java.io.IOException

serialize

void serialize(DataTree dt,
               java.util.Map<java.lang.Long,java.lang.Integer> sessions,
               java.io.File name)
               throws java.io.IOException

persist the datatree and the sessions into a persistence storage

Parameters:

dt - the datatree to be serialized

sessions -

Throws:

java.io.IOException

findMostRecentSnapshot

java.io.File findMostRecentSnapshot()
                                    throws java.io.IOException

find the most recent snapshot file

Returns:

the most recent snapshot file

Throws:

java.io.IOException

close

void close()
           throws java.io.IOException

free resources from this snapshot immediately

Throws:

java.io.IOException