opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/sharding/LookupTask.java

   1 /*
   2  * Copyright (c) 2017 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.sharding;
   9
  10 import static akka.actor.ActorRef.noSender;
  11
  12 import akka.actor.ActorRef;
  13 import akka.actor.Status;
  14 import org.eclipse.jdt.annotation.Nullable;
  15
  16 /**
  17  * Base class for lookup tasks. Lookup tasks are supposed to run repeatedly until successful lookup or maximum retries
  18  * are hit. This class is NOT thread-safe.
  19  */
  20 @Deprecated(forRemoval = true)
  21 abstract class LookupTask implements Runnable {
  22     private final int maxRetries;
  23     private final ActorRef replyTo;
  24     private int retried = 0;
  25
  26     LookupTask(final ActorRef replyTo, final int maxRetries) {
  27         this.replyTo = replyTo;
  28         this.maxRetries = maxRetries;
  29     }
  30
  31     abstract void reschedule(int retries);
  32
  33     void tryReschedule(final @Nullable Throwable throwable) {
  34         if (retried <= maxRetries) {
  35             retried++;
  36             reschedule(retried);
  37         } else {
  38             fail(throwable);
  39         }
  40     }
  41
  42     void fail(final @Nullable Throwable throwable) {
  43         if (throwable == null) {
  44             replyTo.tell(new Status.Failure(
  45                     new DOMDataTreeShardCreationFailedException("Unable to find the backend shard."
  46                             + "Failing..")), noSender());
  47         } else {
  48             replyTo.tell(new Status.Failure(
  49                     new DOMDataTreeShardCreationFailedException("Unable to find the backend shard."
  50                             + "Failing..", throwable)), noSender());
  51         }
  52     }
  53 }