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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/stllike/string.h>
#include <map>
#include <mutex>
#include <memory>
namespace searchcorespi::index {
class IndexDiskDir;
class IndexDiskDirState;
class IndexDiskLayout;
/**
* Class used to keep track of the set of disk indexes in an index maintainer.
* The index directories are used as identifiers.
*
* DiskIndexCleaner will remove old disk indexes not marked active,
* i.e. old disk indexes used by old index collections are not removed.
*
* At start of fusion, an entry for fusion output index is added, to allow for
* tracking of transient disk use while fusion is ongoing. If fusion fails then
* the entry is removed, otherwise the entry is marked active as a side effect
* of setting up a new index collection.
*/
class DiskIndexes {
std::map<IndexDiskDir, IndexDiskDirState> _active;
mutable std::mutex _lock;
public:
using SP = std::shared_ptr<DiskIndexes>;
DiskIndexes();
~DiskIndexes();
DiskIndexes(const DiskIndexes &) = delete;
DiskIndexes & operator = (const DiskIndexes &) = delete;
void setActive(const vespalib::string & index, uint64_t size_on_disk);
void notActive(const vespalib::string & index);
bool isActive(const vespalib::string & index) const;
void add_not_active(IndexDiskDir index_disk_dir);
bool remove(IndexDiskDir index_disk_dir);
uint64_t get_transient_size(IndexDiskLayout& layout, IndexDiskDir index_disk_dir) const;
};
}
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