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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 "prioritizedbucket.h"
#include <vespa/storage/bucketdb/bucketdatabase.h>
#include <boost/iterator/iterator_facade.hpp>
namespace storage::distributor {
class BucketPriorityDatabase
{
protected:
class ConstIteratorImpl
{
public:
virtual ~ConstIteratorImpl() = default;
virtual void increment() noexcept = 0;
virtual bool equal(const ConstIteratorImpl& other) const noexcept = 0;
virtual PrioritizedBucket dereference() const noexcept = 0;
};
using ConstIteratorImplPtr = std::unique_ptr<ConstIteratorImpl>;
public:
class ConstIterator
: public boost::iterator_facade<
ConstIterator,
PrioritizedBucket const,
boost::forward_traversal_tag,
PrioritizedBucket
>
{
ConstIteratorImplPtr _impl;
public:
explicit ConstIterator(ConstIteratorImplPtr impl) noexcept
: _impl(std::move(impl))
{}
ConstIterator(const ConstIterator &) = delete;
ConstIterator(ConstIterator &&) noexcept = default;
virtual ~ConstIterator() = default;
private:
friend class boost::iterator_core_access;
void increment() noexcept {
_impl->increment();
}
[[nodiscard]] bool equal(const ConstIterator& other) const noexcept {
return _impl->equal(*other._impl);
}
PrioritizedBucket dereference() const noexcept {
return _impl->dereference();
}
};
using const_iterator = ConstIterator;
virtual ~BucketPriorityDatabase() = default;
virtual const_iterator begin() const = 0;
virtual const_iterator end() const = 0;
virtual void setPriority(const PrioritizedBucket&) = 0;
};
}
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