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BitTorrent Client Library (Core)
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/*
 * Copyright (c) 2016—2017 Andrei Tomashpolskiy and individual contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package bt.net;

import bt.metainfo.TorrentId;
import bt.protocol.IHandshakeFactory;
import bt.torrent.TorrentRegistry;

import java.time.Duration;
import java.util.Collection;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;

/**
 *Note that this class implements a service.
 * Hence, is not a part of the public API and is a subject to change.
 */
public class ConnectionHandlerFactory implements IConnectionHandlerFactory {

    private IHandshakeFactory handshakeFactory;
    private ConnectionHandler incomingHandler;
    private Duration peerHandshakeTimeout;

    private Collection handshakeHandlers;

    private Map outgoingHandlers;

    public ConnectionHandlerFactory(IHandshakeFactory handshakeFactory,
                                    TorrentRegistry torrentRegistry,
                                    Collection handshakeHandlers,
                                    Duration peerHandshakeTimeout) {
        this.handshakeFactory = handshakeFactory;
        this.incomingHandler = new IncomingHandshakeHandler(handshakeFactory, torrentRegistry,
                handshakeHandlers, peerHandshakeTimeout);

        this.outgoingHandlers = new ConcurrentHashMap<>();
        this.handshakeHandlers = handshakeHandlers;

        this.peerHandshakeTimeout = peerHandshakeTimeout;
    }

    @Override
    public ConnectionHandler getIncomingHandler() {
        return incomingHandler;
    }

    @Override
    public ConnectionHandler getOutgoingHandler(TorrentId torrentId) {
        Objects.requireNonNull(torrentId, "Missing torrent ID");
        ConnectionHandler outgoing = outgoingHandlers.get(torrentId);
        if (outgoing == null) {
            outgoing = new OutgoingHandshakeHandler(handshakeFactory, torrentId,
                    handshakeHandlers, peerHandshakeTimeout.toMillis());
            ConnectionHandler existing = outgoingHandlers.putIfAbsent(torrentId, outgoing);
            if (existing != null) {
                outgoing = existing;
            }
        }
        return outgoing;
    }
}