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/*
 * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.controller.cluster.raft;

import org.opendaylight.controller.cluster.DataPersistenceProvider;
import org.opendaylight.controller.cluster.raft.persisted.UpdateElectionTerm;
import org.slf4j.Logger;

/**
 * Implementation of ElectionTerm for the RaftActor.
 */
class ElectionTermImpl implements ElectionTerm {
    private long currentTerm = 0;
    private String votedFor = null;

    private final DataPersistenceProvider persistence;

    private final Logger log;
    private final String logId;

    ElectionTermImpl(DataPersistenceProvider persistence, String logId, Logger log) {
        this.persistence = persistence;
        this.logId = logId;
        this.log = log;
    }

    @Override
    public long getCurrentTerm() {
        return currentTerm;
    }

    @Override
    public String getVotedFor() {
        return votedFor;
    }

    @Override
    public void update(long newTerm, String newVotedFor) {
        log.debug("{}: Set currentTerm={}, votedFor={}", logId, newTerm, newVotedFor);
        this.currentTerm = newTerm;
        this.votedFor = newVotedFor;
    }

    @Override
    public void updateAndPersist(long newTerm, String newVotedFor) {
        update(newTerm, newVotedFor);
        // FIXME : Maybe first persist then update the state
        persistence.persist(new UpdateElectionTerm(this.currentTerm, this.votedFor), NoopProcedure.instance());
    }
}