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package raft
import (
"io"
)
// FSM provides an interface that can be implemented by
// clients to make use of the replicated log.
type FSM interface {
// Apply log is invoked once a log entry is committed.
Apply(*Log) interface{}
// Snapshot is used to support log compaction. This call should
// return an FSMSnapshot which can be used to save a point-in-time
// snapshot of the FSM. Apply and Snapshot are not called in multiple
// threads, but Apply will be called concurrently with Persist. This means
// the FSM should be implemented in a fashion that allows for concurrent
// updates while a snapshot is happening.
Snapshot() (FSMSnapshot, error)
// Restore is used to restore an FSM from a snapshot. It is not called
// concurrently with any other command. The FSM must discard all previous
// state.
Restore(io.ReadCloser) error
}
// FSMSnapshot is returned by an FSM in response to a Snapshot
// It must be safe to invoke FSMSnapshot methods with concurrent
// calls to Apply.
type FSMSnapshot interface {
// Persist should dump all necessary state to the WriteCloser 'sink',
// and call sink.Close() when finished or call sink.Cancel() on error.
Persist(sink SnapshotSink) error
// Release is invoked when we are finished with the snapshot.
Release()
}
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