2 * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.controller.cluster.access.client;
10 import com.google.common.base.Preconditions;
11 import java.util.Optional;
14 * Implementation-internal intermediate subclass between {@link AbstractClientConnection} and two-out of three of its
15 * subclasses. It allows us to share some code.
17 * @author Robert Varga
19 * @param <T> Concrete {@link BackendInfo} type
21 abstract class AbstractReceivingClientConnection<T extends BackendInfo> extends AbstractClientConnection<T> {
23 * Multiplication factor applied to remote's advertised limit on outstanding messages. Our default strategy
24 * rate-limiting strategy in {@link AveragingProgressTracker} does not penalize threads as long as we have not
25 * reached half of the target.
28 * By multiplying the advertised maximum by four, our queue steady-state should end up with:
29 * - the backend pipeline being full,
30 * - another full batch of messages being in the queue while not paying any throttling cost
31 * - another 2 full batches of messages with incremental throttling cost
33 private static final int MESSAGE_QUEUE_FACTOR = 4;
35 private final T backend;
37 AbstractReceivingClientConnection(final ClientActorContext context, final Long cookie, final T backend) {
38 super(context, cookie, new TransmitQueue.Transmitting(targetQueueSize(backend), backend));
39 this.backend = Preconditions.checkNotNull(backend);
42 AbstractReceivingClientConnection(final AbstractReceivingClientConnection<T> oldConnection) {
43 super(oldConnection, targetQueueSize(oldConnection.backend));
44 this.backend = oldConnection.backend;
47 private static int targetQueueSize(final BackendInfo backend) {
48 return backend.getMaxMessages() * MESSAGE_QUEUE_FACTOR;
52 public final Optional<T> getBackendInfo() {
53 return Optional.of(backend);