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#pragma once
#include <Interpreters/Context_fwd.h>
#include <Common/ThreadStatus.h>
#include <memory>
#include <string>
#include <string_view>
namespace ProfileEvents
{
class Counters;
}
class MemoryTracker;
namespace DB
{
class QueryStatus;
struct Progress;
class InternalTextLogsQueue;
/** Collection of static methods to work with thread-local objects.
* Allows to attach and detach query/process (thread group) to a thread
* (to calculate query-related metrics and to allow to obtain query-related data from a thread).
* Thread will propagate it's metrics to attached query.
*/
class CurrentThread
{
public:
/// Return true in case of successful initialization
static bool isInitialized();
/// Handler to current thread
static ThreadStatus & get();
/// Group to which belongs current thread
static ThreadGroupPtr getGroup();
/// MemoryTracker for user that owns current thread if any
static MemoryTracker * getUserMemoryTracker();
/// Adjust counters in MemoryTracker hierarchy if untracked_memory is not 0.
static void flushUntrackedMemory();
/// A logs queue used by TCPHandler to pass logs to a client
static void attachInternalTextLogsQueue(const std::shared_ptr<InternalTextLogsQueue> & logs_queue,
LogsLevel client_logs_level);
static std::shared_ptr<InternalTextLogsQueue> getInternalTextLogsQueue();
static void attachInternalProfileEventsQueue(const InternalProfileEventsQueuePtr & queue);
static InternalProfileEventsQueuePtr getInternalProfileEventsQueue();
static void attachQueryForLog(const String & query_);
/// Makes system calls to update ProfileEvents that contain info from rusage and taskstats
static void updatePerformanceCounters();
static void updatePerformanceCountersIfNeeded();
static ProfileEvents::Counters & getProfileEvents();
inline ALWAYS_INLINE static MemoryTracker * getMemoryTracker()
{
if (unlikely(!current_thread))
return nullptr;
return ¤t_thread->memory_tracker;
}
/// Update read and write rows (bytes) statistics (used in system.query_thread_log)
static void updateProgressIn(const Progress & value);
static void updateProgressOut(const Progress & value);
/// You must call one of these methods when create a query child thread:
/// Add current thread to a group associated with the thread group
static void attachToGroup(const ThreadGroupPtr & thread_group);
/// Is useful for a ThreadPool tasks
static void attachToGroupIfDetached(const ThreadGroupPtr & thread_group);
/// Non-master threads call this method in destructor automatically
static void detachFromGroupIfNotDetached();
/// Update ProfileEvents and dumps info to system.query_thread_log
static void finalizePerformanceCounters();
/// Returns a non-empty string if the thread is attached to a query
static std::string_view getQueryId();
/// Initializes query with current thread as master thread in constructor, and detaches it in destructor
struct QueryScope : private boost::noncopyable
{
explicit QueryScope(ContextMutablePtr query_context, std::function<void()> fatal_error_callback = {});
explicit QueryScope(ContextPtr query_context, std::function<void()> fatal_error_callback = {});
~QueryScope();
void logPeakMemoryUsage();
bool log_peak_memory_usage_in_destructor = true;
};
};
}
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