ceph/src/rocksdb/utilities/cassandra/cassandra_options.h

   1 // Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
   2 //  This source code is licensed under both the GPLv2 (found in the
   3 //  COPYING file in the root directory) and Apache 2.0 License
   4 //  (found in the LICENSE.Apache file in the root directory).
   5
   6 #pragma once
   7
   8 #include <cstddef>
   9 #include <cstdint>
  10 #include <string>
  11
  12 #include "rocksdb/rocksdb_namespace.h"
  13
  14 namespace ROCKSDB_NAMESPACE {
  15 class ObjectLibrary;
  16 namespace cassandra {
  17 struct CassandraOptions {
  18   static const char* kName() { return "CassandraOptions"; }
  19   CassandraOptions(int32_t _gc_grace_period_in_seconds, size_t _operands_limit,
  20                    bool _purge_ttl_on_expiration = false)
  21       : operands_limit(_operands_limit),
  22         gc_grace_period_in_seconds(_gc_grace_period_in_seconds),
  23         purge_ttl_on_expiration(_purge_ttl_on_expiration) {}
  24   // Limit on the number of merge operands.
  25   size_t operands_limit;
  26
  27   // How long (in seconds) tombstoned data remains before it is purged
  28   int32_t gc_grace_period_in_seconds;
  29
  30   // If is set to true, expired data will be directly purged.
  31   // Otherwise expired data will be converted tombstones first,
  32   // then be eventually removed after gc grace period. This value should
  33   // only true if all writes have same ttl setting, otherwise it could bring old
  34   // data back.
  35   bool purge_ttl_on_expiration;
  36 };
  37 #ifndef ROCKSDB_LITE
  38 extern "C" {
  39 int RegisterCassandraObjects(ObjectLibrary& library, const std::string& arg);
  40 }  // extern "C"
  41 #endif  // ROCKSDB_LITE
  42 }  // namespace cassandra
  43 }  // namespace ROCKSDB_NAMESPACE