org.anhonesteffort.chnlbrkr.stream.ChannelStreamerFactory.java Source code

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Here is the source code for org.anhonesteffort.chnlbrkr.stream.ChannelStreamerFactory.java

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/*
 * Copyright (C) 2015 An Honest Effort LLC, coping.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.anhonesteffort.chnlbrkr.stream;

import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import io.netty.channel.ChannelHandlerContext;
import org.anhonesteffort.chnlzr.CapnpUtil;
import org.anhonesteffort.chnlbrkr.ChnlBrkrConfig;
import org.anhonesteffort.chnlzr.WriteQueuingContext;
import org.anhonesteffort.chnlbrkr.chnlzr.IdleChnlzrConnection;
import org.capnproto.MessageBuilder;

import static org.anhonesteffort.chnlzr.Proto.ChannelRequest;

public class ChannelStreamerFactory {

    private final ChnlBrkrConfig config;

    public ChannelStreamerFactory(ChnlBrkrConfig config) {
        this.config = config;
    }

    public ListenableFuture<ChannelStreamer> create(IdleChnlzrConnection connection, WriteQueuingContext client,
            ChannelRequest.Reader request) {
        MessageBuilder capabilities = CapnpUtil.builder(connection.getCapabilitiesMessage());
        SettableFuture<ChannelRequestHandler> requestFuture = SettableFuture.create();
        SettableFuture<ChannelStreamer> streamFuture = SettableFuture.create();

        ChannelRequestHandler requestHandler = new ChannelRequestHandler(requestFuture, request, connection.getId(),
                config.chnlzrRequestAnswerTimeoutMs());
        connection.getContext().pipeline().replace(connection, "request", requestHandler);

        Futures.addCallback(requestFuture, new ChannelRequestCallback(streamFuture, client, capabilities));

        return streamFuture;
    }

    private static class ChannelRequestCallback implements FutureCallback<ChannelRequestHandler> {
        private final SettableFuture<ChannelStreamer> future;
        private final WriteQueuingContext client;
        private final MessageBuilder capabilities;

        public ChannelRequestCallback(SettableFuture<ChannelStreamer> future, WriteQueuingContext client,
                MessageBuilder capabilities) {
            this.future = future;
            this.capabilities = capabilities;
            this.client = client;
        }

        @Override
        public void onSuccess(ChannelRequestHandler requestHandler) {
            ChannelHandlerContext chnlzr = requestHandler.getContext();
            ChannelStreamer streamer = new ChannelStreamer(chnlzr, client, capabilities, requestHandler.getState(),
                    requestHandler.getChnlzrId());

            chnlzr.pipeline().replace(requestHandler, "stream", streamer);

            if (!future.set(streamer)) {
                chnlzr.close();
            }
        }

        @Override
        public void onFailure(Throwable throwable) {
            future.setException(throwable);
        }
    }

}