/*
 * Copyright 2014-2017 Real Logic Ltd.
 *
 * 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 io.aeron.driver;

import io.aeron.driver.media.UdpChannel;
import org.agrona.concurrent.NanoClock;
import org.agrona.concurrent.status.CountersManager;

import java.net.InetSocketAddress;

public class StaticWindowCongestionControl implements CongestionControl
{
    private final long ccOutcome;

    public StaticWindowCongestionControl(
        final long registrationId,
        final UdpChannel udpChannel,
        final int streamId,
        final int sessionId,
        final int termLength,
        final int senderMtuLength,
        final NanoClock clock,
        final MediaDriver.Context context,
        final CountersManager countersManager)
    {
        ccOutcome = CongestionControlUtil.packOutcome(Math.min(termLength / 2, context.initialWindowLength()), false);
    }

    public void close()
    {
    }

    public boolean shouldMeasureRtt(final long nowNs)
    {
        return false;
    }

    public void onRttMeasurement(final long nowNs, final long rttNs, final InetSocketAddress srcAddress)
    {
    }

    public long onTrackRebuild(
        final long nowNs,
        final long newConsumptionPosition,
        final long lastSmPosition,
        final long hwmPosition,
        final long startingRebuildPosition,
        final long endingRebuildPosition,
        final boolean lossOccurred)
    {
        return ccOutcome;
    }

    public int initialWindowLength()
    {
        return CongestionControlUtil.receiverWindowLength(ccOutcome);
    }
}