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/**
* Copyright (C) 2014 MongoDB 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/scoped_ptr.hpp>
#include "mongo/base/disallow_copying.h"
#include "mongo/bson/timestamp.h"
#include "mongo/util/time_support.h"
namespace mongo {
class BSONObj;
class OID;
class OperationContext;
class Status;
struct HostAndPort;
template <typename T> class StatusWith;
namespace repl {
/**
* This class represents the interface the ReplicationCoordinator uses to interact with the
* rest of the system. All functionality of the ReplicationCoordinatorImpl that would introduce
* dependencies on large sections of the server code and thus break the unit testability of
* ReplicationCoordinatorImpl should be moved here.
*/
class ReplicationCoordinatorExternalState {
MONGO_DISALLOW_COPYING(ReplicationCoordinatorExternalState);
public:
ReplicationCoordinatorExternalState();
virtual ~ReplicationCoordinatorExternalState();
/**
* Starts the background sync, producer, and sync source feedback threads
*
* NOTE: Only starts threads if they are not already started,
*/
virtual void startThreads() = 0;
/**
* Starts the Master/Slave threads and sets up logOp
*/
virtual void startMasterSlave(OperationContext* txn) = 0;
/**
* Performs any necessary external state specific shutdown tasks, such as cleaning up
* the threads it started.
*/
virtual void shutdown() = 0;
/**
* Creates the oplog and writes the first entry.
*/
virtual void initiateOplog(OperationContext* txn) = 0;
/**
* Simple wrapper around SyncSourceFeedback::forwardSlaveProgress. Signals to the
* SyncSourceFeedback thread that it needs to wake up and send a replSetUpdatePosition
* command upstream.
*/
virtual void forwardSlaveProgress() = 0;
/**
* Queries the singleton document in local.me. If it exists and our hostname has not
* changed since we wrote, returns the RID stored in the object. If the document does not
* exist or our hostname doesn't match what was recorded in local.me, generates a new OID
* to use as our RID, stores it in local.me, and returns it.
*/
virtual OID ensureMe(OperationContext*) = 0;
/**
* Returns true if "host" is one of the network identities of this node.
*/
virtual bool isSelf(const HostAndPort& host) = 0;
/**
* Gets the replica set config document from local storage, or returns an error.
*/
virtual StatusWith<BSONObj> loadLocalConfigDocument(OperationContext* txn) = 0;
/**
* Stores the replica set config document in local storage, or returns an error.
*/
virtual Status storeLocalConfigDocument(OperationContext* txn, const BSONObj& config) = 0;
/**
* Sets the global opTime to be 'newTime'.
*/
virtual void setGlobalTimestamp(const Timestamp& newTime) = 0;
/**
* Gets the last optime of an operation performed on this host, from stable
* storage.
*/
virtual StatusWith<Timestamp> loadLastOpTime(OperationContext* txn) = 0;
/**
* Returns the HostAndPort of the remote client connected to us that initiated the operation
* represented by "txn".
*/
virtual HostAndPort getClientHostAndPort(const OperationContext* txn) = 0;
/**
* Closes all connections except those marked with the keepOpen property, which should
* just be connections used for heartbeating.
* This is used during stepdown, and transition out of primary.
*/
virtual void closeConnections() = 0;
/**
* Kills all operations that have a Client that is associated with an incoming user
* connection. Used during stepdown.
*/
virtual void killAllUserOperations(OperationContext* txn) = 0;
/**
* Clears all cached sharding metadata on this server. This is called after stepDown to
* ensure that if the node becomes primary again in the future it will reload an up-to-date
* version of the sharding data.
*/
virtual void clearShardingState() = 0;
/**
* Notifies the bgsync and syncSourceFeedback threads to choose a new sync source.
*/
virtual void signalApplierToChooseNewSyncSource() = 0;
/**
* Returns an OperationContext, owned by the caller, that may be used in methods of
* the same instance that require an OperationContext.
*/
virtual OperationContext* createOperationContext(const std::string& threadName) = 0;
/**
* Drops all temporary collections on all databases except "local".
*
* The implementation may assume that the caller has acquired the global exclusive lock
* for "txn".
*/
virtual void dropAllTempCollections(OperationContext* txn) = 0;
};
} // namespace repl
} // namespace mongo
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