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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 "bucketprioritydatabase.h"
#include <vespa/vespalib/stllike/hash_map.h>
#include <set>
#include <map>
namespace storage::distributor {
class SimpleBucketPriorityDatabase : public BucketPriorityDatabase
{
public:
SimpleBucketPriorityDatabase();
~SimpleBucketPriorityDatabase() override;
using Priority = PrioritizedBucket::Priority;
void setPriority(const PrioritizedBucket&) override;
const_iterator begin() const override;
const_iterator end() const override;
std::string toString() const;
private:
struct PriFifoCompositeKey {
Priority _pri;
uint64_t _seq_num;
constexpr PriFifoCompositeKey() noexcept : _pri(Priority::VERY_LOW), _seq_num(0) {}
constexpr PriFifoCompositeKey(Priority pri, uint64_t seq_num) noexcept
: _pri(pri),
_seq_num(seq_num)
{}
constexpr bool operator<(const PriFifoCompositeKey& rhs) const noexcept {
if (_pri != rhs._pri) {
// Unlike StorageAPI priorities, MaintenancePriority is higher value == higher priority
return (_pri > rhs._pri);
}
return _seq_num < rhs._seq_num;
}
};
using PriFifoBucketMap = std::map<PriFifoCompositeKey, document::Bucket>;
// Important: the map iterator instances MUST be stable in the presence of other inserts/erases!
using BucketToPriIteratorMap = vespalib::hash_map<document::Bucket, PriFifoBucketMap::iterator, document::Bucket::hash>;
class PriFifoMappingConstIteratorImpl final : public ConstIteratorImpl {
PriFifoBucketMap::const_iterator _pri_fifo_iter;
PriFifoBucketMap::const_iterator _pri_fifo_end;
public:
PriFifoMappingConstIteratorImpl(PriFifoBucketMap::const_iterator pri_fifo_iter,
PriFifoBucketMap::const_iterator pri_fifo_end) noexcept
: _pri_fifo_iter(pri_fifo_iter),
_pri_fifo_end(pri_fifo_end)
{}
~PriFifoMappingConstIteratorImpl() override = default;
void increment() noexcept override;
bool equal(const ConstIteratorImpl& other) const noexcept override;
PrioritizedBucket dereference() const noexcept override;
};
void clearAllEntriesForBucket(const document::Bucket &bucket);
PriFifoBucketMap _pri_fifo_buckets;
BucketToPriIteratorMap _bucket_to_pri_iterators;
uint64_t _fifo_seq_num;
};
}
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