aaa-password-service/impl/src/main/java/org/opendaylight/aaa/impl/password/service/OSGiPasswordServiceConfigBootstrap.java

   1 /*
   2  * Copyright (c) 2020 PANTHEON.tech, s.r.o. 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.aaa.impl.password.service;
   9
  10 import com.google.common.annotations.Beta;
  11 import com.google.common.collect.Iterables;
  12 import java.util.Collection;
  13 import org.checkerframework.checker.lock.qual.Holding;
  14 import org.opendaylight.mdsal.binding.api.ClusteredDataTreeChangeListener;
  15 import org.opendaylight.mdsal.binding.api.DataBroker;
  16 import org.opendaylight.mdsal.binding.api.DataTreeIdentifier;
  17 import org.opendaylight.mdsal.binding.api.DataTreeModification;
  18 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.aaa.password.service.config.rev170619.PasswordServiceConfig;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.aaa.password.service.config.rev170619.PasswordServiceConfigBuilder;
  21 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  22 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  23 import org.osgi.service.component.ComponentFactory;
  24 import org.osgi.service.component.ComponentInstance;
  25 import org.osgi.service.component.annotations.Activate;
  26 import org.osgi.service.component.annotations.Component;
  27 import org.osgi.service.component.annotations.Deactivate;
  28 import org.osgi.service.component.annotations.Reference;
  29 import org.slf4j.Logger;
  30 import org.slf4j.LoggerFactory;
  31
  32 @Beta
  33 @Component(immediate = true)
  34 public final class OSGiPasswordServiceConfigBootstrap
  35         implements ClusteredDataTreeChangeListener<PasswordServiceConfig> {
  36     private static final Logger LOG = LoggerFactory.getLogger(OSGiPasswordServiceConfigBootstrap.class);
  37
  38     @Reference
  39     DataBroker dataBroker = null;
  40
  41     @Reference(target = "(component.factory=" + OSGiPasswordServiceConfig.FACTORY_NAME + ")")
  42     ComponentFactory configFactory = null;
  43
  44     private ListenerRegistration<?> registration;
  45     private ComponentInstance instance;
  46
  47     @Activate
  48     synchronized void activate() {
  49         registration = dataBroker.registerDataTreeChangeListener(
  50             DataTreeIdentifier.create(LogicalDatastoreType.CONFIGURATION,
  51                 InstanceIdentifier.create(PasswordServiceConfig.class)), this);
  52         LOG.info("Listening for password service configuration");
  53     }
  54
  55     @Deactivate
  56     synchronized void deactivate() {
  57         registration.close();
  58         registration = null;
  59         if (instance != null) {
  60             instance.dispose();
  61             instance = null;
  62         }
  63         LOG.info("No longer listening for password service configuration");
  64     }
  65
  66     @Override
  67     public synchronized void onInitialData() {
  68         updateInstance(null);
  69     }
  70
  71     @Override
  72     public synchronized void onDataTreeChanged(final Collection<DataTreeModification<PasswordServiceConfig>> changes) {
  73         // FIXME: at this point we need to populate default values -- from the XML file
  74         updateInstance(Iterables.getLast(changes).getRootNode().getDataAfter());
  75     }
  76
  77     @Holding("this")
  78     private void updateInstance(final PasswordServiceConfig config) {
  79         if (registration != null) {
  80             final ComponentInstance newInstance = configFactory.newInstance(
  81                 OSGiPasswordServiceConfig.props(config != null ? config : new PasswordServiceConfigBuilder().build()));
  82             if (instance != null) {
  83                 instance.dispose();
  84             }
  85             instance = newInstance;
  86         }
  87     }
  88 }