opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/utils/CompositeOnComplete.java

   1 /*
   2  * Copyright (c) 2017 Inocybe Technologies 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.datastore.utils;
   9
  10 import akka.dispatch.OnComplete;
  11 import java.util.ArrayList;
  12 import java.util.List;
  13 import org.slf4j.Logger;
  14 import org.slf4j.LoggerFactory;
  15
  16 /**
  17  * An OnComplete implementation that aggrgates other OnComplete tasks.
  18  *
  19  * @author Thomas Pantelis
  20  *
  21  * @param <T> the result type
  22  */
  23 public abstract class CompositeOnComplete<T> extends OnComplete<T> {
  24     private static final Logger LOG = LoggerFactory.getLogger(CompositeOnComplete.class);
  25
  26     private final List<OnComplete<T>> onCompleteTasks = new ArrayList<>();
  27
  28     public void addOnComplete(OnComplete<T> task) {
  29         onCompleteTasks.add(task);
  30     }
  31
  32     @SuppressWarnings({ "checkstyle:IllegalCatch", "squid:S1181" /*  Throwable and Error should not be caught */ })
  33     protected void notifyOnCompleteTasks(Throwable failure, T result) {
  34         for (OnComplete<T> task: onCompleteTasks) {
  35             try {
  36                 task.onComplete(failure, result);
  37             } catch (Throwable e) {
  38                 LOG.error("Caught unexpected exception", e);
  39             }
  40         }
  41
  42         onCompleteTasks.clear();
  43     }
  44 }