/*
* ToroDB
* Copyright © 2014 8Kdata Technology (www.8kdata.com)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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/>.
*/
package com.torodb.mongodb.repl;
import com.eightkdata.mongowp.OpTime;
import com.google.common.net.HostAndPort;
import com.torodb.mongodb.repl.exceptions.NoSyncSourceFoundException;
import java.util.Optional;
/**
*
*/
public interface SyncSourceProvider {
public HostAndPort newSyncSource() throws NoSyncSourceFoundException;
/**
* Returns the host and port of the server that must be used to read from.
* <p>
* The host and port is decided by the using the given optime and the old reader.
* <p>
* @param lastFetchedOpTime the optime of the last fetched operation
* @return
* @throws NoSyncSourceFoundException iff there is no sync source we can reply from using the
* given optime
*/
public default HostAndPort newSyncSource(OpTime lastFetchedOpTime) throws
NoSyncSourceFoundException {
return newSyncSource();
}
public Optional<HostAndPort> getLastUsedSyncSource();
public boolean shouldChangeSyncSource();
}