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 ListeningExecutorService listeningExecutorService;
  34     private final DataBroker dataBroker;
  35
  36     @Inject
  37     public ListenerRegistrationHelper(final DataBroker dataBroker) {
  38         this.dataBroker = dataBroker;
  39         listeningExecutorService = MoreExecutors.listeningDecorator(Executors.newSingleThreadExecutor(
  40             new ThreadFactoryBuilder()
  41                 .setNameFormat("frm-listener" + "%d")
  42                 .setDaemon(false)
  43                 .setUncaughtExceptionHandler((thread, ex) -> LOG.error("Uncaught exception {}", thread, ex))
  44                 .build()));
  45     }
  46
  47     public <T extends DataObject, L extends ClusteredDataTreeChangeListener<T>>
  48             ListenableFuture<ListenerRegistration<L>> checkedRegisterListener(
  49                 final DataTreeIdentifier<T> treeId, final L listener) {
  50         return listeningExecutorService.submit(() -> {
  51             while (!getInventoryConfigDataStoreStatus().equals("OPERATIONAL")) {
  52                 try {
  53                     LOG.debug("Retrying for datastore to become operational for listener {}", listener);
  54                     Thread.sleep(INVENTORY_CHECK_TIMER * 1000);
  55                 } catch (InterruptedException e) {
  56                     LOG.info("registerDataTreeChangeListener thread is interrupted");
  57                     Thread.currentThread().interrupt();
  58                 }
  59             }
  60             return dataBroker.registerDataTreeChangeListener(treeId, listener);
  61         });
  62     }
  63
  64     public void close() throws Exception {
  65         MoreExecutors.shutdownAndAwaitTermination(listeningExecutorService, 5, TimeUnit.SECONDS);
  66     }
  67 }