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#pragma once
#include <Interpreters/Context_fwd.h>
#include <Interpreters/StorageID.h>
#include <Storages/IStorage_fwd.h>
#include <Common/ActionLock.h>
#include <base/types.h>
#include <mutex>
#include <unordered_map>
namespace DB
{
/// Holds ActionLocks for tables
/// Does not store pointers to tables
class ActionLocksManager : WithContext
{
public:
explicit ActionLocksManager(ContextPtr context);
/// Add new lock for a table if it has not been already added
void add(const StorageID & table_id, StorageActionBlockType action_type);
void add(const StoragePtr & table, StorageActionBlockType action_type);
/// Removes a lock for a table if it exists
void remove(const StorageID & table_id, StorageActionBlockType action_type);
void remove(const StoragePtr & table, StorageActionBlockType action_type);
/// Removes all locks of non-existing tables
void cleanExpired();
private:
using StorageRawPtr = const IStorage *;
using Locks = std::unordered_map<size_t, ActionLock>;
using StorageLocks = std::unordered_map<StorageRawPtr, Locks>;
mutable std::mutex mutex;
StorageLocks storage_locks;
};
}
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