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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 "bucketdb.h"
#include <mutex>
namespace proton::bucketdb {
class Guard
{
public:
Guard(BucketDB *bucketDB, std::mutex &mutex);
Guard(const Guard &) = delete;
Guard(Guard &&rhs);
Guard &operator=(const Guard &) = delete;
Guard &operator=(Guard &&rhs) = delete;
BucketDB *operator->() { return _bucketDB; }
BucketDB &operator*() { return *_bucketDB; }
const BucketDB *operator->() const { return _bucketDB; }
const BucketDB &operator*() const { return *_bucketDB; }
private:
BucketDB *_bucketDB;
std::unique_lock<std::mutex> _guard;
};
/**
* Class that owns and provides guarded access to a bucket database.
*/
class BucketDBOwner
{
public:
BucketDBOwner();
Guard takeGuard() {
return Guard(&_bucketDB, _mutex);
}
size_t getNumActiveDocs() const { return _bucketDB.getNumActiveDocs(); }
private:
BucketDB _bucketDB;
std::mutex _mutex;
};
}
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