elanmanager/impl/src/main/java/org/opendaylight/netvirt/elan/cache/ElanInstanceCache.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.netvirt.elan.cache;
   9
  10 import com.google.common.base.Optional;
  11 import java.util.ArrayList;
  12 import java.util.Collection;
  13 import java.util.HashMap;
  14 import java.util.Map;
  15 import javax.inject.Inject;
  16 import javax.inject.Singleton;
  17 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  18 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  19 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  20 import org.opendaylight.genius.mdsalutil.cache.DataObjectCache;
  21 import org.opendaylight.infrautils.caches.CacheProvider;
  22 import org.opendaylight.netvirt.elanmanager.api.ElanHelper;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.ElanInstances;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.elan.instances.ElanInstance;
  25 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  26 import org.slf4j.Logger;
  27 import org.slf4j.LoggerFactory;
  28
  29 /**
  30  * Caches ElanInstances.
  31  *
  32  * @author Thomas Pantelis
  33  */
  34 @Singleton
  35 public class ElanInstanceCache extends DataObjectCache<ElanInstance> {
  36     private static final Logger LOG = LoggerFactory.getLogger(ElanInstanceCache.class);
  37
  38     private final Map<InstanceIdentifier<ElanInstance>, Collection<Runnable>> waitingJobs = new HashMap<>();
  39
  40     @Inject
  41     public ElanInstanceCache(DataBroker dataBroker, CacheProvider cacheProvider) {
  42         super(ElanInstance.class, dataBroker, LogicalDatastoreType.CONFIGURATION,
  43                 InstanceIdentifier.create(ElanInstances.class).child(ElanInstance.class), cacheProvider);
  44     }
  45
  46     public Optional<ElanInstance> get(String elanInstanceName) {
  47         try {
  48             return get(ElanHelper.getElanInstanceConfigurationDataPath(elanInstanceName));
  49         } catch (ReadFailedException e) {
  50             LOG.warn("Error reading ElanInstance {}", elanInstanceName, e);
  51             return Optional.absent();
  52         }
  53     }
  54
  55     public Optional<ElanInstance> get(String elanInstanceName, Runnable runAfterElanIsAvailable) {
  56         Optional<ElanInstance> possibleInstance = get(elanInstanceName);
  57         if (!possibleInstance.isPresent()) {
  58             synchronized (waitingJobs) {
  59                 possibleInstance = get(elanInstanceName);
  60                 if (!possibleInstance.isPresent()) {
  61                     waitingJobs.computeIfAbsent(ElanHelper.getElanInstanceConfigurationDataPath(elanInstanceName),
  62                         key -> new ArrayList<>()).add(runAfterElanIsAvailable);
  63                 }
  64             }
  65         }
  66
  67         return possibleInstance;
  68     }
  69
  70     @Override
  71     protected void added(InstanceIdentifier<ElanInstance> path, ElanInstance elanInstance) {
  72         Collection<Runnable> jobsToRun;
  73         synchronized (waitingJobs) {
  74             jobsToRun = waitingJobs.remove(path);
  75         }
  76
  77         if (jobsToRun != null) {
  78             jobsToRun.forEach(Runnable::run);
  79         }
  80     }
  81 }