Interface SnapShot
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- All Known Implementing Classes:
FileSnap
public interface SnapShot
snapshot 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 void
close()
free resources from this snapshot immediatelylong
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 deserializedjava.io.File
findMostRecentSnapshot()
find the most recent snapshot fileSnapshotInfo
getLastSnapshotInfo()
get information of the last saved/restored snapshotvoid
serialize(DataTree dt, java.util.Map<java.lang.Long,java.lang.Integer> sessions, java.io.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, 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 intosessions
- the sessions to be deserialized into- Returns:
- the last zxid that was deserialized from the snapshot
- Throws:
java.io.IOException
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serialize
void serialize(DataTree dt, java.util.Map<java.lang.Long,java.lang.Integer> sessions, java.io.File name, boolean fsync) throws java.io.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:
java.io.IOException
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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
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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 java.io.IOException
free resources from this snapshot immediately- Throws:
java.io.IOException
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