Initial commit

vendor/github.com/cockroachdb/pebble/internal/private/flush_external.go

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+// Copyright 2020 The LevelDB-Go and Pebble Authors. All rights reserved. Use
+// of this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+
+package private
+
+import "github.com/cockroachdb/pebble/internal/manifest"
+
+// FlushExternalTable is a hook for linking files into L0 without assigning a
+// global sequence number, mimicking a flush. FlushExternalTable takes a
+// *pebble.DB, the path and the metadata of a sstable to flush directly into
+// L0.
+//
+// Calls to flush a sstable may fail if the file's sequence numbers are not
+// greater than the current commit pipeline's sequence number. On success the
+// commit pipeline's published sequence number will be moved to the file's
+// highest sequence number.
+//
+// This function is wrapped in a safer, more ergonomic API in the
+// internal/replay package. Clients should use the replay package rather than
+// calling this private hook directly.
+var FlushExternalTable func(interface{}, string, *manifest.FileMetadata) error
+
+// RatchetSeqNum is a hook for allocating and publishing sequence numbers up
+// to a specific absolute value. Its first parameter is a *pebble.DB and its
+// second is the new next sequence number. RatchetSeqNum does nothing if the
+// next sequence is already greater than or equal to nextSeqNum.
+//
+// This function is used by the internal/replay package to ensure replayed
+// operations receive the same absolute sequence number.
+var RatchetSeqNum func(interface{}, uint64)