55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
#pragma once
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#include <functional>
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#include "sds.h"
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#define METADATA_DB_IDENTIFIER "c299fde0-6d42-4ec4-b939-34f680ffe39f"
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class IStorageFactory
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{
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public:
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typedef void (*key_load_iterator)(const char *rgchKey, size_t cchKey, void *privdata);
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virtual ~IStorageFactory() {}
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virtual class IStorage *create(int db, key_load_iterator itr, void *privdata) = 0;
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virtual class IStorage *createMetadataDb() = 0;
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virtual const char *name() const = 0;
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virtual size_t totalDiskspaceUsed() const = 0;
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virtual bool FSlow() const = 0;
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virtual size_t filedsRequired() const { return 0; }
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};
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class IStorage
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{
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public:
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typedef std::function<bool(const char *, size_t, const void *, size_t)> callback;
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typedef std::function<void(const char *, size_t, const void *, size_t)> callbackSingle;
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virtual ~IStorage();
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virtual void insert(const char *key, size_t cchKey, void *data, size_t cb, bool fOverwire) = 0;
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virtual bool erase(const char *key, size_t cchKey) = 0;
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virtual void retrieve(const char *key, size_t cchKey, callbackSingle fn) const = 0;
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virtual size_t clear() = 0;
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virtual bool enumerate(callback fn) const = 0;
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virtual size_t count() const = 0;
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virtual void bulkInsert(char **rgkeys, size_t *rgcbkeys, char **rgvals, size_t *rgcbvals, size_t celem) {
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beginWriteBatch();
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for (size_t ielem = 0; ielem < celem; ++ielem) {
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insert(rgkeys[ielem], rgcbkeys[ielem], rgvals[ielem], rgcbvals[ielem], false);
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}
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endWriteBatch();
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}
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virtual void beginWriteBatch() {} // NOP
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virtual void endWriteBatch() {} // NOP
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virtual void batch_lock() {} // NOP
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virtual void batch_unlock() {} // NOP
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virtual void flush() = 0;
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/* This is permitted to be a shallow clone */
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virtual const IStorage *clone() const = 0;
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};
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