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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/documentapi/common.h>
#include <vespa/slobrok/imirrorapi.h>
#include <mutex>
namespace documentapi {
class LoadBalancer {
public:
LoadBalancer(const string& cluster, const string& session);
~LoadBalancer();
string getLastSpec(size_t target) const;
double getWeight(size_t target) const;
/**
Returns the spec and the node index of the node we should send to.
If none are found, node index is -1.
*/
std::pair<string, int> getRecipient(const slobrok::api::IMirrorAPI::SpecList& choices);
void received(uint32_t nodeIndex, bool busy);
private:
using lock_guard = std::lock_guard<std::mutex>;
std::pair<string, int> getRecipient(const lock_guard & guard, const slobrok::api::IMirrorAPI::SpecList& choices);
void normalizeWeights(const lock_guard & guard);
uint32_t getIndex(const string& name) const;
class NodeInfo {
public:
NodeInfo() noexcept : weight(1.0), sent(0), busy(0), valid(false), lastSpec() {}
double weight;
uint32_t sent;
uint32_t busy;
bool valid;
string lastSpec;
};
mutable std::mutex _mutex;
std::vector<NodeInfo> _nodeInfo;
string _cluster;
string _session;
double _position;
};
}
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