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#pragma once
#include <Common/PoolBase.h>
#include <Common/Priority.h>
#include <Client/Connection.h>
#include <IO/ConnectionTimeouts.h>
#include <Core/Settings.h>
#include <base/defines.h>
namespace DB
{
/** Interface for connection pools.
*
* Usage (using the usual `ConnectionPool` example)
* ConnectionPool pool(...);
*
* void thread()
* {
* auto connection = pool.get();
* connection->sendQuery(...);
* }
*/
class IConnectionPool : private boost::noncopyable
{
public:
using Entry = PoolBase<Connection>::Entry;
virtual ~IConnectionPool() = default;
/// Selects the connection to work.
/// If force_connected is false, the client must manually ensure that returned connection is good.
virtual Entry get(const ConnectionTimeouts & timeouts, /// NOLINT
const Settings * settings = nullptr,
bool force_connected = true) = 0;
virtual Priority getPriority() const { return Priority{1}; }
};
using ConnectionPoolPtr = std::shared_ptr<IConnectionPool>;
using ConnectionPoolPtrs = std::vector<ConnectionPoolPtr>;
/** A common connection pool, without fault tolerance.
*/
class ConnectionPool : public IConnectionPool, private PoolBase<Connection>
{
public:
using Entry = IConnectionPool::Entry;
using Base = PoolBase<Connection>;
ConnectionPool(unsigned max_connections_,
const String & host_,
UInt16 port_,
const String & default_database_,
const String & user_,
const String & password_,
const String & quota_key_,
const String & cluster_,
const String & cluster_secret_,
const String & client_name_,
Protocol::Compression compression_,
Protocol::Secure secure_,
Priority priority_ = Priority{1})
: Base(max_connections_,
&Poco::Logger::get("ConnectionPool (" + host_ + ":" + toString(port_) + ")")),
host(host_),
port(port_),
default_database(default_database_),
user(user_),
password(password_),
quota_key(quota_key_),
cluster(cluster_),
cluster_secret(cluster_secret_),
client_name(client_name_),
compression(compression_),
secure(secure_),
priority(priority_)
{
}
Entry get(const ConnectionTimeouts & timeouts, /// NOLINT
const Settings * settings = nullptr,
bool force_connected = true) override
{
Entry entry;
if (settings)
entry = Base::get(settings->connection_pool_max_wait_ms.totalMilliseconds());
else
entry = Base::get(-1);
if (force_connected)
entry->forceConnected(timeouts);
return entry;
}
const std::string & getHost() const
{
return host;
}
std::string getDescription() const
{
return host + ":" + toString(port);
}
Priority getPriority() const override
{
return priority;
}
protected:
/** Creates a new object to put in the pool. */
ConnectionPtr allocObject() override
{
return std::make_shared<Connection>(
host, port,
default_database, user, password, quota_key,
cluster, cluster_secret,
client_name, compression, secure);
}
private:
String host;
UInt16 port;
String default_database;
String user;
String password;
String quota_key;
/// For inter-server authorization
String cluster;
String cluster_secret;
String client_name;
Protocol::Compression compression; /// Whether to compress data when interacting with the server.
Protocol::Secure secure; /// Whether to encrypt data when interacting with the server.
Priority priority; /// priority from <remote_servers>
};
/**
* Connection pool factory. Responsible for creating new connection pools and reuse existing ones.
*/
class ConnectionPoolFactory final : private boost::noncopyable
{
public:
struct Key
{
unsigned max_connections;
String host;
UInt16 port;
String default_database;
String user;
String password;
String quota_key;
String cluster;
String cluster_secret;
String client_name;
Protocol::Compression compression;
Protocol::Secure secure;
Priority priority;
};
struct KeyHash
{
size_t operator()(const ConnectionPoolFactory::Key & k) const;
};
static ConnectionPoolFactory & instance();
ConnectionPoolPtr
get(unsigned max_connections,
String host,
UInt16 port,
String default_database,
String user,
String password,
String quota_key,
String cluster,
String cluster_secret,
String client_name,
Protocol::Compression compression,
Protocol::Secure secure,
Priority priority);
private:
mutable std::mutex mutex;
using ConnectionPoolWeakPtr = std::weak_ptr<IConnectionPool>;
std::unordered_map<Key, ConnectionPoolWeakPtr, KeyHash> pools TSA_GUARDED_BY(mutex);
};
inline bool operator==(const ConnectionPoolFactory::Key & lhs, const ConnectionPoolFactory::Key & rhs)
{
return lhs.max_connections == rhs.max_connections && lhs.host == rhs.host && lhs.port == rhs.port
&& lhs.default_database == rhs.default_database && lhs.user == rhs.user && lhs.password == rhs.password
&& lhs.quota_key == rhs.quota_key
&& lhs.cluster == rhs.cluster && lhs.cluster_secret == rhs.cluster_secret && lhs.client_name == rhs.client_name
&& lhs.compression == rhs.compression && lhs.secure == rhs.secure && lhs.priority == rhs.priority;
}
}
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