applications/forwardingrules-manager/src/main/java/org/opendaylight/openflowplugin/applications/frm/impl/ListenerRegistrationHelper.java

   1 /*
   2  * Copyright (c) 2020 Ericsson India Global Services Pvt Ltd. 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.openflowplugin.applications.frm.impl;
   9
  10 import static org.opendaylight.openflowplugin.applications.frm.util.FrmUtil.getInventoryConfigDataStoreStatus;
  11
  12 import com.google.common.util.concurrent.ListenableFuture;
  13 import com.google.common.util.concurrent.ListeningExecutorService;
  14 import com.google.common.util.concurrent.MoreExecutors;
  15 import com.google.common.util.concurrent.ThreadFactoryBuilder;
  16 import java.util.concurrent.Executors;
  17 import java.util.concurrent.TimeUnit;
  18 import javax.inject.Inject;
  19 import javax.inject.Singleton;
  20 import org.opendaylight.mdsal.binding.api.ClusteredDataTreeChangeListener;
  21 import org.opendaylight.mdsal.binding.api.DataBroker;
  22 import org.opendaylight.mdsal.binding.api.DataTreeIdentifier;
  23 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  24 import org.opendaylight.yangtools.yang.binding.DataObject;
  25 import org.slf4j.Logger;
  26 import org.slf4j.LoggerFactory;
  27
  28 @Singleton
  29 public class ListenerRegistrationHelper {
  30     private static final Logger LOG = LoggerFactory.getLogger(ListenerRegistrationHelper.class);
  31     private static final long INVENTORY_CHECK_TIMER = 1;
  32
  33     private final String operational = "OPERATIONAL";
  34     private final ListeningExecutorService listeningExecutorService;
  35     private final DataBroker dataBroker;
  36
  37     @Inject
  38     public ListenerRegistrationHelper(final DataBroker dataBroker) {
  39         this.dataBroker = dataBroker;
  40         listeningExecutorService = MoreExecutors.listeningDecorator(Executors.newSingleThreadExecutor(
  41             new ThreadFactoryBuilder()
  42                 .setNameFormat("frm-listener" + "%d")
  43                 .setDaemon(false)
  44                 .setUncaughtExceptionHandler((thread, ex) -> LOG.error("Uncaught exception {}", thread, ex))
  45                 .build()));
  46     }
  47
  48     public <T extends DataObject, L extends ClusteredDataTreeChangeListener<T>>
  49             ListenableFuture<ListenerRegistration<L>> checkedRegisterListener(
  50                 DataTreeIdentifier<T> treeId, L listener) {
  51         return listeningExecutorService.submit(() -> {
  52             while (!getInventoryConfigDataStoreStatus().equals(operational)) {
  53                 try {
  54                     LOG.debug("Retrying for datastore to become operational for listener {}", listener);
  55                     Thread.sleep(INVENTORY_CHECK_TIMER * 1000);
  56                 } catch (InterruptedException e) {
  57                     LOG.info("registerDataTreeChangeListener thread is interrupted");
  58                     Thread.currentThread().interrupt();
  59                 }
  60             }
  61             return dataBroker.registerDataTreeChangeListener(treeId, listener);
  62         });
  63     }
  64
  65     public void close() throws Exception {
  66         MoreExecutors.shutdownAndAwaitTermination(listeningExecutorService, 5, TimeUnit.SECONDS);
  67     }
  68 }