1 files changed, 95 insertions, 0 deletions
diff --git a/src/rocksdb/table/sst_file_writer_collectors.h b/src/rocksdb/table/sst_file_writer_collectors.h
new file mode 100644
index 000000000..486315fb5
--- /dev/null
+++ b/src/rocksdb/table/sst_file_writer_collectors.h
@@ -0,0 +1,95 @@
+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+
+#pragma once
+#include <string>
+
+#include "db/table_properties_collector.h"
+#include "rocksdb/types.h"
+#include "util/coding.h"
+#include "util/string_util.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+// Table Properties that are specific to tables created by SstFileWriter.
+struct ExternalSstFilePropertyNames {
+  // value of this property is a fixed uint32 number.
+  static const std::string kVersion;
+  // value of this property is a fixed uint64 number.
+  static const std::string kGlobalSeqno;
+};
+
+// PropertiesCollector used to add properties specific to tables
+// generated by SstFileWriter
+class SstFileWriterPropertiesCollector : public IntTblPropCollector {
+ public:
+  explicit SstFileWriterPropertiesCollector(int32_t version,
+                                            SequenceNumber global_seqno)
+      : version_(version), global_seqno_(global_seqno) {}
+
+  virtual Status InternalAdd(const Slice& /*key*/, const Slice& /*value*/,
+                             uint64_t /*file_size*/) override {
+    // Intentionally left blank. Have no interest in collecting stats for
+    // individual key/value pairs.
+    return Status::OK();
+  }
+
+  virtual void BlockAdd(uint64_t /* block_uncomp_bytes */,
+                        uint64_t /* block_compressed_bytes_fast */,
+                        uint64_t /* block_compressed_bytes_slow */) override {
+    // Intentionally left blank. No interest in collecting stats for
+    // blocks.
+    return;
+  }
+
+  virtual Status Finish(UserCollectedProperties* properties) override {
+    // File version
+    std::string version_val;
+    PutFixed32(&version_val, static_cast<uint32_t>(version_));
+    properties->insert({ExternalSstFilePropertyNames::kVersion, version_val});
+
+    // Global Sequence number
+    std::string seqno_val;
+    PutFixed64(&seqno_val, static_cast<uint64_t>(global_seqno_));
+    properties->insert({ExternalSstFilePropertyNames::kGlobalSeqno, seqno_val});
+
+    return Status::OK();
+  }
+
+  virtual const char* Name() const override {
+    return "SstFileWriterPropertiesCollector";
+  }
+
+  virtual UserCollectedProperties GetReadableProperties() const override {
+    return {{ExternalSstFilePropertyNames::kVersion, std::to_string(version_)}};
+  }
+
+ private:
+  int32_t version_;
+  SequenceNumber global_seqno_;
+};
+
+class SstFileWriterPropertiesCollectorFactory
+    : public IntTblPropCollectorFactory {
+ public:
+  explicit SstFileWriterPropertiesCollectorFactory(int32_t version,
+                                                   SequenceNumber global_seqno)
+      : version_(version), global_seqno_(global_seqno) {}
+
+  virtual IntTblPropCollector* CreateIntTblPropCollector(
+      uint32_t /*column_family_id*/, int /* level_at_creation */) override {
+    return new SstFileWriterPropertiesCollector(version_, global_seqno_);
+  }
+
+  virtual const char* Name() const override {
+    return "SstFileWriterPropertiesCollector";
+  }
+
+ private:
+  int32_t version_;
+  SequenceNumber global_seqno_;
+};
+
+}  // namespace ROCKSDB_NAMESPACE