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rocksdb

2.6.0
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RocksDB for Erlang

Retired package: Release invalid - Use 2.6.1 instead
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rocksdb deps rocksdb db pre_release_callback.h
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deps/rocksdb/db/pre_release_callback.h 

// 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 "rocksdb/status.h"

#include "rocksdb/types.h"



namespace ROCKSDB_NAMESPACE {



class PreReleaseCallback {

 public:

  virtual ~PreReleaseCallback() {}



  // Will be called while on the write thread after the write to the WAL and

  // before the write to memtable. This is useful if any operation needs to be

  // done before the write gets visible to the readers, or if we want to reduce

  // the overhead of locking by updating something sequentially while we are on

  // the write thread. If the callback fails, this function returns a non-OK

  // status, the sequence number will not be released, and same status will be

  // propagated to all the writers in the write group.

  // seq is the sequence number that is used for this write and will be

  // released.

  // is_mem_disabled is currently used for debugging purposes to assert that

  // the callback is done from the right write queue.

  // If non-zero, log_number indicates the WAL log to which we wrote.

  // index >= 0 specifies the order of callback in the same write thread.

  // total > index specifies the total number of callbacks in the same write

  // thread. Together with index, could be used to reduce the redundant

  // operations among the callbacks.

  virtual Status Callback(SequenceNumber seq, bool is_mem_disabled,

                          uint64_t log_number, size_t index, size_t total) = 0;

};



}  // namespace ROCKSDB_NAMESPACE