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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 <vector>
namespace search {
class IndexMetaInfo
{
public:
struct Snapshot
{
bool valid;
uint64_t syncToken;
vespalib::string dirName;
Snapshot() noexcept : valid(false), syncToken(0), dirName() {}
Snapshot(bool valid_, uint64_t syncToken_, const vespalib::string &dirName_)
: valid(valid_), syncToken(syncToken_), dirName(dirName_) {}
bool operator==(const Snapshot &rhs) const {
return (valid == rhs.valid
&& syncToken == rhs.syncToken
&& dirName == rhs.dirName);
}
bool operator<(const Snapshot &rhs) const {
return syncToken < rhs.syncToken;
}
};
using SnapshotList = std::vector<Snapshot>;
using SnapItr = SnapshotList::iterator;
private:
vespalib::string _path;
SnapshotList _snapshots;
vespalib::string makeFileName(const vespalib::string &baseName);
Snapshot &getCreateSnapshot(uint32_t idx);
SnapItr findSnapshot(uint64_t syncToken);
public:
IndexMetaInfo(const vespalib::string &path);
~IndexMetaInfo();
vespalib::string getPath() const { return _path; }
void setPath(const vespalib::string &path) { _path = path; }
const SnapshotList &snapshots() const { return _snapshots; }
Snapshot getSnapshot(uint64_t syncToken) const;
Snapshot getBestSnapshot() const;
bool addSnapshot(const Snapshot &snap);
bool removeSnapshot(uint64_t syncToken);
bool validateSnapshot(uint64_t syncToken);
bool invalidateSnapshot(uint64_t syncToken);
void clear();
bool load(const vespalib::string &baseName = "meta-info.txt");
bool save(const vespalib::string &baseName = "meta-info.txt");
};
} // namespace search
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