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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
#include <zencore/compactbinary.h>
#include <zenutil/zenserverprocess.h>
#include <atomic>
#include <filesystem>
namespace zen {
/**
* Storage Server Instance
*
* This class manages the lifecycle of a storage server instance, and
* provides functions to query its state. There should be one instance
* per module ID.
*/
class StorageServerInstance
{
public:
struct Configuration
{
uint16_t BasePort;
std::filesystem::path HydrationTempPath;
std::string HydrationTargetSpecification;
CbObject HydrationOptions;
uint32_t HttpThreadCount = 0; // Automatic
int CoreLimit = 0; // Automatic
std::filesystem::path ConfigPath;
};
StorageServerInstance(ZenServerEnvironment& RunEnvironment, const Configuration& Config, std::string_view ModuleId);
~StorageServerInstance();
inline std::string_view GetModuleId() const { return m_ModuleId; }
inline uint16_t GetBasePort() const { return m_Config.BasePort; }
ProcessMetrics GetProcessMetrics() const;
#if ZEN_PLATFORM_WINDOWS
void SetJobObject(JobObject* InJobObject) { m_JobObject = InJobObject; }
#endif
class SharedLockedPtr
{
public:
SharedLockedPtr(const SharedLockedPtr&) = delete;
SharedLockedPtr();
SharedLockedPtr(RwLock& Lock, StorageServerInstance* Instance, bool Wait);
SharedLockedPtr(SharedLockedPtr&& Rhs);
~SharedLockedPtr();
SharedLockedPtr& operator=(const SharedLockedPtr&) = delete;
SharedLockedPtr& operator =(SharedLockedPtr&& Rhs);
operator bool() const { return m_Instance != nullptr; }
std::string_view GetModuleId() const;
uint16_t GetBasePort() const
{
ZEN_ASSERT(m_Instance);
return m_Instance->GetBasePort();
}
bool IsRunning() const;
ProcessMetrics GetProcessMetrics() const
{
ZEN_ASSERT(m_Instance);
return m_Instance->GetProcessMetrics();
}
#if ZEN_WITH_TESTS
void TerminateForTesting() const; // kills the child process to simulate a crash
#endif
private:
RwLock* m_Lock = nullptr;
StorageServerInstance* m_Instance = nullptr;
};
[[nodiscard]] SharedLockedPtr LockShared(bool Wait) { return SharedLockedPtr(m_Lock, this, Wait); }
class ExclusiveLockedPtr
{
public:
ExclusiveLockedPtr(const ExclusiveLockedPtr&) = delete;
ExclusiveLockedPtr();
ExclusiveLockedPtr(RwLock& Lock, StorageServerInstance* Instance, bool Wait);
ExclusiveLockedPtr(ExclusiveLockedPtr&& Rhs);
~ExclusiveLockedPtr();
ExclusiveLockedPtr& operator=(const ExclusiveLockedPtr&) = delete;
ExclusiveLockedPtr& operator =(ExclusiveLockedPtr&& Rhs);
operator bool() const { return m_Instance != nullptr; }
std::string_view GetModuleId() const;
uint16_t GetBasePort() const
{
ZEN_ASSERT(m_Instance);
return m_Instance->GetBasePort();
}
bool IsRunning() const;
void Provision();
void Deprovision();
void Hibernate();
void Wake();
private:
RwLock* m_Lock = nullptr;
StorageServerInstance* m_Instance = nullptr;
};
[[nodiscard]] ExclusiveLockedPtr LockExclusive(bool Wait) { return ExclusiveLockedPtr(m_Lock, this, Wait); }
private:
void ProvisionLocked();
void DeprovisionLocked();
void HibernateLocked();
void WakeLocked();
mutable RwLock m_Lock;
const Configuration m_Config;
std::string m_ModuleId;
ZenServerInstance m_ServerInstance;
std::filesystem::path m_BaseDir;
std::filesystem::path m_TempDir;
#if ZEN_PLATFORM_WINDOWS
JobObject* m_JobObject = nullptr;
#endif
void SpawnServerProcess();
void Hydrate();
void Dehydrate();
friend class SharedLockedPtr;
friend class ExclusiveLockedPtr;
};
} // namespace zen
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