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A QUIC implementation in Java
There is a newer version: 0.9.1
/*
 * Copyright © 2020, 2021, 2022, 2023, 2024 Peter Doornbosch
 *
 * This file is part of Kwik, an implementation of the QUIC protocol in Java.
 *
 * Kwik is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 *
 * Kwik 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 Lesser General Public License for
 * more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see .
 */
package net.luminis.quic.cid;

import net.luminis.quic.log.Logger;
import net.luminis.quic.util.Bytes;

import java.util.Arrays;


public class SourceConnectionIdRegistry extends ConnectionIdRegistry {

    public SourceConnectionIdRegistry(Integer cidLength, Logger logger) {
        super(cidLength, logger);
    }

    public ConnectionIdInfo generateNew() {
        int sequenceNr = connectionIds.keySet().stream().max(Integer::compareTo).get() + 1;
        ConnectionIdInfo newCid = new ConnectionIdInfo(sequenceNr, generateConnectionId(), ConnectionIdStatus.NEW);
        connectionIds.put(sequenceNr, newCid);
        return newCid;
    }

    /**
     * Registers a connection id for being used.
     * @param connectionId
     * @return true is the connection id is new (newly used), false otherwise.
     */
    public boolean registerUsedConnectionId(byte[] connectionId) {
        if (! Arrays.equals(currentConnectionId, connectionId)) {
            // Register previous connection id as used
            connectionIds.values().stream()
                    .filter(cid -> Arrays.equals(cid.getConnectionId(), currentConnectionId))
                    .forEach(cid -> cid.setStatus(ConnectionIdStatus.USED));
            currentConnectionId = connectionId;
            // Check if new connection id is newly used
            boolean wasNew = connectionIds.values().stream()
                    .filter(cid -> Arrays.equals(cid.getConnectionId(), currentConnectionId))
                    .anyMatch(cid -> cid.getConnectionIdStatus().equals(ConnectionIdStatus.NEW));
            // Register current connection id as current
            connectionIds.values().stream()
                    .filter(cid -> Arrays.equals(cid.getConnectionId(), currentConnectionId))
                    .forEach(cid -> cid.setStatus(ConnectionIdStatus.IN_USE));
            log.info("Peer has switched to connection id " + Bytes.bytesToHex(currentConnectionId));
            return wasNew;
        }
        else {
            return false;
        }
    }

    public int getMaxSequenceNr() {
        return connectionIds.keySet().stream().max(Integer::compareTo).get();
    }

    public byte[] get(int sequenceNr) {
        return connectionIds.get(sequenceNr).getConnectionId();
    }

}