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#pragma once
#include <compare>
#include <Client/Connection.h>
#include <Storages/MergeTree/RequestResponse.h>
namespace DB
{
/// Base class for working with multiple replicas (connections)
/// from one shard within a single thread
class IConnections : boost::noncopyable
{
public:
/// Send all scalars to replicas.
virtual void sendScalarsData(Scalars & data) = 0;
/// Send all content of external tables to replicas.
virtual void sendExternalTablesData(std::vector<ExternalTablesData> & data) = 0;
/// Send request to replicas.
virtual void sendQuery(
const ConnectionTimeouts & timeouts,
const String & query,
const String & query_id,
UInt64 stage,
ClientInfo & client_info,
bool with_pending_data) = 0;
virtual void sendReadTaskResponse(const String &) = 0;
virtual void sendMergeTreeReadTaskResponse(const ParallelReadResponse & response) = 0;
/// Get packet from any replica.
virtual Packet receivePacket() = 0;
/// Version of `receivePacket` function without locking.
virtual Packet receivePacketUnlocked(AsyncCallback async_callback) = 0;
/// Break all active connections.
virtual void disconnect() = 0;
/// Send a request to replicas to cancel the request
virtual void sendCancel() = 0;
/// Send parts' uuids to replicas to exclude them from query processing
virtual void sendIgnoredPartUUIDs(const std::vector<UUID> & uuids) = 0;
/** On each replica, read and skip all packets to EndOfStream or Exception.
* Returns EndOfStream if no exception has been received. Otherwise
* returns the last received packet of type Exception.
*/
virtual Packet drain() = 0;
/// Get the replica addresses as a string.
virtual std::string dumpAddresses() const = 0;
struct ReplicaInfo
{
bool collaborate_with_initiator{false};
size_t all_replicas_count{0};
size_t number_of_current_replica{0};
};
/// This is needed in max_parallel_replicas case.
/// We create a RemoteQueryExecutor for each replica
virtual void setReplicaInfo(ReplicaInfo value) = 0;
/// Returns the number of replicas.
virtual size_t size() const = 0;
/// Check if there are any valid replicas.
virtual bool hasActiveConnections() const = 0;
virtual ~IConnections() = default;
virtual void setAsyncCallback(AsyncCallback) {}
};
}
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