opendaylight/md-sal/cds-access-client/src/main/java/org/opendaylight/controller/cluster/access/client/AbstractReceivingClientConnection.java

   1 /*
   2  * Copyright (c) 2016 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   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
   7  */
   8 package org.opendaylight.controller.cluster.access.client;
   9
  10 import com.google.common.base.Preconditions;
  11 import java.util.Optional;
  12
  13 /**
  14  * Implementation-internal intermediate subclass between {@link AbstractClientConnection} and two-out of three of its
  15  * sublcasses. It allows us to share some code.
  16  *
  17  * @author Robert Varga
  18  *
  19  * @param <T> Concrete {@link BackendInfo} type
  20  */
  21 abstract class AbstractReceivingClientConnection<T extends BackendInfo> extends AbstractClientConnection<T> {
  22     private final T backend;
  23     private long nextTxSequence;
  24
  25     AbstractReceivingClientConnection(final ClientActorContext context, final Long cookie, final T backend) {
  26         super(context, cookie);
  27         this.backend = Preconditions.checkNotNull(backend);
  28     }
  29
  30     AbstractReceivingClientConnection(final AbstractReceivingClientConnection<T> oldConnection) {
  31         super(oldConnection);
  32         this.backend = oldConnection.backend;
  33         this.nextTxSequence = oldConnection.nextTxSequence;
  34     }
  35
  36     @Override
  37     public final Optional<T> getBackendInfo() {
  38         return Optional.of(backend);
  39     }
  40
  41     final T backend() {
  42         return backend;
  43     }
  44
  45     final long nextTxSequence() {
  46         return nextTxSequence++;
  47     }
  48 }