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#pragma once
#include <util/generic/buffer.h>
namespace NKiwiAggr {
class IMerger {
private:
bool IsMerged;
ui32 AutoMergeInterval; // Call Merge() after each AutoMergeInterval calls of Add(); zero means no autoMerge
ui32 NotMergedCount;
public:
IMerger(ui32 autoMergeInterval = 0)
: IsMerged(true)
, AutoMergeInterval(autoMergeInterval)
, NotMergedCount(0)
{
}
virtual ~IMerger() {
}
// returns true if something is added
virtual bool Add(const void* data, size_t size) {
if (AddImpl(data, size)) {
AutoMerge();
return true;
}
return false;
}
virtual void Merge() {
if (!IsMerged) {
MergeImpl();
IsMerged = true;
}
}
virtual void Reset() {
ResetImpl();
IsMerged = true;
}
// You can add some more result-getters if you want.
// Do not forget to call Merge() in the beginning of each merger.
virtual void GetResult(TBuffer& buffer) = 0;
protected:
// AutoMerge() is called in Add() after each AddImpl()
void AutoMerge() {
IsMerged = false;
if (AutoMergeInterval) {
++NotMergedCount;
if (NotMergedCount >= AutoMergeInterval) {
MergeImpl();
IsMerged = true;
NotMergedCount = 0;
}
}
}
// Implementation of merger: define it in derivatives
virtual bool AddImpl(const void* data, size_t size) = 0; // returns true if something is added
virtual void MergeImpl() = 0;
virtual void ResetImpl() = 0;
};
}
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