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main
db/pre_release_callback.h
37 строк
2 KB
Peter Dillinger
Fix and detect headers with missing dependencies (#8893)
10 сен 2021, 20:00
10 сен 2021, 20:00
bda8d93
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// 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