/*
* 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.protocol.StatusMessageFlyweight;
import java.net.InetSocketAddress;
import static io.aeron.logbuffer.LogBufferDescriptor.computePosition;
/**
* Default unicast sender flow control strategy.
*
* Max of right edges.
* No tracking of receivers.
*/
public class UnicastFlowControl implements FlowControl
{
/**
* {@inheritDoc}
*/
public long onStatusMessage(
final StatusMessageFlyweight flyweight,
final InetSocketAddress receiverAddress,
final long senderLimit,
final int initialTermId,
final int positionBitsToShift,
final long nowNs)
{
final long position =
computePosition(
flyweight.consumptionTermId(),
flyweight.consumptionTermOffset(),
positionBitsToShift,
initialTermId);
return Math.max(senderLimit, position + flyweight.receiverWindowLength());
}
/**
* {@inheritDoc}
*/
public void initialize(final int initialTermId, final int termBufferCapacity)
{
}
/**
* {@inheritDoc}
*/
public long onIdle(final long nowNs, final long senderLimit)
{
return senderLimit;
}
}