es.uam.eps.ir.relison.diffusion.expiration.AllNotRealPropagatedTimestampExpirationMechanism Maven / Gradle / Ivy
/*
* Copyright (C) 2020 Information Retrieval Group at Universidad Autónoma
* de Madrid, http://ir.ii.uam.es
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
package es.uam.eps.ir.relison.diffusion.expiration;
import es.uam.eps.ir.relison.diffusion.data.Data;
import es.uam.eps.ir.relison.diffusion.data.Information;
import es.uam.eps.ir.relison.diffusion.simulation.UserState;
import java.io.Serializable;
import java.util.stream.Stream;
/**
* If current timestamp is greater than the timestamp of the pieces, the elements
* are discarded.
*
* @author Javier Sanz-Cruzado ([email protected])
* @author Pablo Castells ([email protected])
*
* @param Type of the users.
* @param Type of the information pieces.
* @param Type of the features.
*/
public class AllNotRealPropagatedTimestampExpirationMechanism implements ExpirationMechanism
{
@Override
public Stream expire(UserState user, Data data, int numIter, Long timestamp)
{
U u = user.getUserId();
if(timestamp != null)
{
return user.getReceivedInformation().filter(piece ->
{
I i = data.getInformationPiecesIndex().idx2object(piece.getInfoId());
return !(data.isRealRepropagatedPiece(user.getUserId(), i) && data.getRealPropagatedTimestamp(u, i) >= timestamp);
}).map(Information::getInfoId);
}
else //If there is no timestamp, we assume that all pieces were created before the timestamp
{
return user.getReceivedInformationIds();
}
}
}