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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "entryref.h"
#include <vespa/vespalib/util/arrayref.h>
#include <vespa/vespalib/util/generationhandler.h>
#include <vespa/vespalib/util/memoryusage.h>
#include <functional>
namespace vespalib::datastore {
class CompactionStrategy;
class EntryComparator;
class EntryRefFilter;
struct ICompactable;
class IUniqueStoreDictionaryReadSnapshot;
class UniqueStoreAddResult;
/**
* Interface class for unique store dictionary.
*/
class IUniqueStoreDictionary {
public:
using generation_t = vespalib::GenerationHandler::generation_t;
virtual ~IUniqueStoreDictionary() = default;
virtual void freeze() = 0;
virtual void transfer_hold_lists(generation_t generation) = 0;
virtual void trim_hold_lists(generation_t firstUsed) = 0;
virtual UniqueStoreAddResult add(const EntryComparator& comp, std::function<EntryRef(void)> insertEntry) = 0;
virtual EntryRef find(const EntryComparator& comp) = 0;
virtual void remove(const EntryComparator& comp, EntryRef ref) = 0;
virtual void move_keys_on_compact(ICompactable& compactable, const EntryRefFilter& compacting_buffers) = 0;
virtual uint32_t get_num_uniques() const = 0;
virtual vespalib::MemoryUsage get_memory_usage() const = 0;
virtual void build(vespalib::ConstArrayRef<EntryRef>, vespalib::ConstArrayRef<uint32_t> ref_counts, std::function<void(EntryRef)> hold) = 0;
virtual void build(vespalib::ConstArrayRef<EntryRef> refs) = 0;
virtual void build_with_payload(vespalib::ConstArrayRef<EntryRef> refs, vespalib::ConstArrayRef<EntryRef> payloads) = 0;
virtual std::unique_ptr<IUniqueStoreDictionaryReadSnapshot> get_read_snapshot() const = 0;
virtual bool get_has_btree_dictionary() const = 0;
virtual bool get_has_hash_dictionary() const = 0;
virtual vespalib::MemoryUsage get_btree_memory_usage() const = 0;
virtual vespalib::MemoryUsage get_hash_memory_usage() const = 0;
virtual bool has_held_buffers() const = 0;
virtual void compact_worst(bool compact_btree_dictionary, bool compact_hash_dictionary, const CompactionStrategy& compaction_strategy) = 0;
};
}
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