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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
namespace proton {
/**
* Class representing the state of an resource (e.g. disk or memory) with its limit and current usage:
* - usage: How much of this resource is currently used (number between 0 and 1).
* - limit: How much of this resource is allowed to use (number between 0 and 1).
* - utilization: How much of the allowed part of this resource is used (usage/limit).
*/
class ResourceUsageState
{
private:
double _limit;
double _usage;
public:
ResourceUsageState()
: _limit(1.0),
_usage(0)
{
}
ResourceUsageState(double limit_, double usage_)
: _limit(limit_),
_usage(usage_)
{
}
bool operator==(const ResourceUsageState &rhs) const {
return ((_limit == rhs._limit) &&
(_usage == rhs._usage));
}
bool operator!=(const ResourceUsageState &rhs) const {
return ! ((*this) == rhs);
}
double limit() const { return _limit; }
double usage() const { return _usage; }
double utilization() const { return _usage/_limit; }
bool aboveLimit() const {
return aboveLimit(1.0);
}
bool aboveLimit(double lowWatermarkFactor) const {
return usage() > (limit() * lowWatermarkFactor);
}
};
} // namespace proton
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