Interface SnapShot
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- All Known Implementing Classes:
FileSnap
public interface SnapShotsnapshot interface for the persistence layer. implement this interface for implementing snapshots.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description voidclose()free resources from this snapshot immediatelylongdeserialize(DataTree dt, Map<Long,Integer> sessions)deserialize a data tree from the last valid snapshot and return the last zxid that was deserializedFilefindMostRecentSnapshot()find the most recent snapshot fileSnapshotInfogetLastSnapshotInfo()get information of the last saved/restored snapshotvoidserialize(DataTree dt, Map<Long,Integer> sessions, File name, boolean fsync)persist the datatree and the sessions into a persistence storage
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Method Detail
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deserialize
long deserialize(DataTree dt, Map<Long,Integer> sessions) throws 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 intosessions- the sessions to be deserialized into- Returns:
- the last zxid that was deserialized from the snapshot
- Throws:
IOException
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serialize
void serialize(DataTree dt, Map<Long,Integer> sessions, File name, boolean fsync) throws IOException
persist the datatree and the sessions into a persistence storage- Parameters:
dt- the datatree to be serializedsessions- the session timeouts to be serializedname- the object name to store snapshot intofsync- sync the snapshot immediately after write- Throws:
IOException
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findMostRecentSnapshot
File findMostRecentSnapshot() throws IOException
find the most recent snapshot file- Returns:
- the most recent snapshot file
- Throws:
IOException
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getLastSnapshotInfo
SnapshotInfo getLastSnapshotInfo()
get information of the last saved/restored snapshot- Returns:
- info of last snapshot
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close
void close() throws IOExceptionfree resources from this snapshot immediately- Throws:
IOException
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