org.anhonesteffort.p25.chnlzr.ChnlzrController.java Source code

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Here is the source code for org.anhonesteffort.p25.chnlzr.ChnlzrController.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.p25.chnlzr;

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 org.anhonesteffort.p25.metric.P25DcodrMetrics;

import javax.annotation.Nonnull;

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

public class ChnlzrController {

    private final HostId chnlzrHost;
    private final ChnlzrConnectionFactory factory;

    public ChnlzrController(HostId chnlzrHost, ChnlzrConnectionFactory factory) {
        this.chnlzrHost = chnlzrHost;
        this.factory = factory;
    }

    public ListenableFuture<SamplesSourceHandler> createSourceFor(ChannelRequest.Reader request) {
        P25DcodrMetrics.getInstance().chnlzrRequest(request.getCenterFrequency());

        ListenableFuture<ChnlzrConnectionHandler> connectFuture = factory.create(chnlzrHost);
        SettableFuture<SamplesSourceHandler> sourceFuture = SettableFuture.create();

        Futures.addCallback(connectFuture, new ChnlzrConnectionCallback(sourceFuture, request));

        return sourceFuture;
    }

    private static class ChnlzrConnectionCallback implements FutureCallback<ChnlzrConnectionHandler> {
        private final SettableFuture<SamplesSourceHandler> sourceFuture;
        private final ChannelRequest.Reader request;

        public ChnlzrConnectionCallback(SettableFuture<SamplesSourceHandler> sourceFuture,
                ChannelRequest.Reader request) {
            this.sourceFuture = sourceFuture;
            this.request = request;
        }

        @Override
        public void onSuccess(ChnlzrConnectionHandler connection) {
            P25DcodrMetrics.getInstance().chnlzrConnectSuccess();

            if (sourceFuture.isCancelled()) {
                connection.getContext().close();
            } else {
                SettableFuture<ChannelRequestHandler> requestFuture = SettableFuture.create();
                ChannelRequestHandler requester = new ChannelRequestHandler(requestFuture, request);

                connection.getContext().pipeline().replace(connection, "requester", requester);
                Futures.addCallback(requestFuture,
                        new ChannelRequestCallback(sourceFuture, connection.getCapabilities()));
            }
        }

        @Override
        public void onFailure(@Nonnull Throwable throwable) {
            P25DcodrMetrics.getInstance().chnlzrConnectFailure();
            sourceFuture.setException(throwable);
        }
    }

    private static class ChannelRequestCallback implements FutureCallback<ChannelRequestHandler> {
        private final SettableFuture<SamplesSourceHandler> sourceFuture;
        private final Capabilities.Reader capabilities;

        public ChannelRequestCallback(SettableFuture<SamplesSourceHandler> sourceFuture,
                Capabilities.Reader capabilities) {
            this.sourceFuture = sourceFuture;
            this.capabilities = capabilities;
        }

        @Override
        public void onSuccess(ChannelRequestHandler requester) {
            P25DcodrMetrics.getInstance().chnlzrRequestSuccess();

            SamplesSourceHandler samplesSource = new SamplesSourceHandler(requester.getContext(), capabilities,
                    requester.getState());
            requester.getContext().pipeline().replace(requester, "streamer", samplesSource);

            if (!sourceFuture.set(samplesSource)) {
                requester.getContext().close();
            }
        }

        @Override
        public void onFailure(@Nonnull Throwable throwable) {
            P25DcodrMetrics.getInstance().chnlzrRequestFailure();
            sourceFuture.setException(throwable);
        }
    }

}