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/* @file db/client.h
"Client" represents a connection to the database (the server-side) and corresponds
to an open socket (or logical connection if pooling on sockets) from a client.
todo: switch to asio...this will fit nicely with that.
*/
/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <boost/thread/thread.hpp>
#include "mongo/db/client_basic.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
#include "mongo/platform/unordered_set.h"
#include "mongo/util/concurrency/spin_lock.h"
#include "mongo/util/concurrency/threadlocal.h"
namespace mongo {
class Collection;
class AbstractMessagingPort;
typedef long long ConnectionId;
/** the database's concept of an outside "client" */
class Client : public ClientBasic {
public:
/** each thread which does db operations has a Client object in TLS.
* call this when your thread starts.
*/
static void initThread(const char *desc, AbstractMessagingPort *mp = 0);
static void initThread(const char* desc,
ServiceContext* serviceContext,
AbstractMessagingPort* mp);
/**
* Inits a thread if that thread has not already been init'd, setting the thread name to
* "desc".
*/
static void initThreadIfNotAlready(const char* desc);
/**
* Inits a thread if that thread has not already been init'd, using the existing thread name
*/
static void initThreadIfNotAlready();
std::string clientAddress(bool includePort = false) const;
const std::string& desc() const { return _desc; }
void reportState(BSONObjBuilder& builder);
// Ensures stability of the client's OperationContext. When the client is locked,
// the OperationContext will not disappear.
void lock() { _lock.lock(); }
void unlock() { _lock.unlock(); }
/**
* Makes a new operation context representing an operation on this client. At most
* one operation context may be in scope on a client at a time.
*/
ServiceContext::UniqueOperationContext makeOperationContext();
/**
* Sets the active operation context on this client to "txn", which must be non-NULL.
*
* It is an error to call this method if there is already an operation context on Client.
* It is an error to call this on an unlocked client.
*/
void setOperationContext(OperationContext* txn);
/**
* Clears the active operation context on this client.
*
* There must already be such a context set on this client.
* It is an error to call this on an unlocked client.
*/
void resetOperationContext();
/**
* Gets the operation context active on this client, or nullptr if there is no such context.
*
* It is an error to call this method on an unlocked client, or to use the value returned
* by this method while the client is not locked.
*/
OperationContext* getOperationContext() { return _txn; }
// TODO(spencer): SERVER-10228 SERVER-14779 Remove this/move it fully into OperationContext.
bool isInDirectClient() const { return _inDirectClient; }
void setInDirectClient(bool newVal) { _inDirectClient = newVal; }
ConnectionId getConnectionId() const { return _connectionId; }
bool isFromUserConnection() const { return _connectionId > 0; }
private:
friend class ServiceContext;
Client(std::string desc,
ServiceContext* serviceContext,
AbstractMessagingPort *p = 0);
// Description for the client (e.g. conn8)
const std::string _desc;
// OS id of the thread, which owns this client
const boost::thread::id _threadId;
// > 0 for things "conn", 0 otherwise
const ConnectionId _connectionId;
// Protects the contents of the Client (such as changing the OperationContext, etc)
mutable SpinLock _lock;
// Whether this client is running as DBDirectClient
bool _inDirectClient = false;
// If != NULL, then contains the currently active OperationContext
OperationContext* _txn = nullptr;
};
/** get the Client object for this thread. */
Client& cc();
bool haveClient();
};
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