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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 "i_disk_mem_usage_listener.h"
#include "memoryflush.h"
#include <vespa/config-proton.h>
#include <vespa/searchcore/proton/common/hw_info.h>
#include <mutex>
namespace proton {
/**
* Class that listens to changes in disk and memory usage and
* updates the config used by memory flush strategy accordingly if we reach one of the resource limits.
*/
class MemoryFlushConfigUpdater : public IDiskMemUsageListener
{
private:
using Mutex = std::mutex;
using LockGuard = std::lock_guard<Mutex>;
using ProtonConfig = vespa::config::search::core::ProtonConfig;
Mutex _mutex;
MemoryFlush::SP _flushStrategy;
ProtonConfig::Flush::Memory _currConfig;
HwInfo::Memory _memory;
DiskMemUsageState _currState;
bool _useConservativeDiskMode;
bool _useConservativeMemoryMode;
bool _nodeRetired;
void considerUseConservativeDiskMode(const LockGuard &guard, MemoryFlush::Config &newConfig);
void considerUseConservativeMemoryMode(const LockGuard &guard, MemoryFlush::Config &newConfig);
void considerUseRelaxedDiskMode(const LockGuard &guard, MemoryFlush::Config &newConfig);
void updateFlushStrategy(const LockGuard &guard, const char * why);
public:
using UP = std::unique_ptr<MemoryFlushConfigUpdater>;
MemoryFlushConfigUpdater(const MemoryFlush::SP &flushStrategy,
const ProtonConfig::Flush::Memory &config,
const HwInfo::Memory &memory);
void setConfig(const ProtonConfig::Flush::Memory &newConfig);
void setNodeRetired(bool nodeRetired);
void notifyDiskMemUsage(DiskMemUsageState newState) override;
static MemoryFlush::Config convertConfig(const ProtonConfig::Flush::Memory &config,
const HwInfo::Memory &memory);
};
} // namespace proton
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