31295b0a1b
Summary: Add License message to public header files. Test Plan: Reviewers: CC: Task ID: # Blame Rev:
65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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#pragma once
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#include <string>
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namespace rocksdb {
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class Slice;
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class BlockBuilder;
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// FlushBlockPolicy provides a configurable way to determine when to flush a
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// block in the block based tables,
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class FlushBlockPolicy {
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public:
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// Keep track of the key/value sequences and return the boolean value to
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// determine if table builder should flush current data block.
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virtual bool Update(const Slice& key,
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const Slice& value) = 0;
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virtual ~FlushBlockPolicy() { }
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};
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class FlushBlockPolicyFactory {
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public:
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// Return the name of the flush block policy.
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virtual const char* Name() const = 0;
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// Return a new block flush policy that flushes data blocks by data size.
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// FlushBlockPolicy may need to access the metadata of the data block
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// builder to determine when to flush the blocks.
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//
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// Callers must delete the result after any database that is using the
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// result has been closed.
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virtual FlushBlockPolicy* NewFlushBlockPolicy(
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const BlockBuilder& data_block_builder) const = 0;
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virtual ~FlushBlockPolicyFactory() { }
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};
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class FlushBlockBySizePolicyFactory : public FlushBlockPolicyFactory {
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public:
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FlushBlockBySizePolicyFactory(const uint64_t block_size,
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const uint64_t block_size_deviation) :
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block_size_(block_size),
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block_size_deviation_(block_size_deviation) {
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}
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virtual const char* Name() const override {
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return "FlushBlockBySizePolicyFactory";
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}
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virtual FlushBlockPolicy* NewFlushBlockPolicy(
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const BlockBuilder& data_block_builder) const override;
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private:
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const uint64_t block_size_;
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const uint64_t block_size_deviation_;
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};
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} // rocksdb
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