applications/lldp-speaker/src/main/java/org/opendaylight/openflowplugin/applications/lldpspeaker/DeviceOwnershipStatusService.java

   1 /*
   2  * Copyright (c) 2017 Lumina Networks, Inc.  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.lldpspeaker;
   9
  10 import com.google.common.base.Optional;
  11 import java.util.ArrayList;
  12 import java.util.List;
  13 import java.util.concurrent.ConcurrentHashMap;
  14 import java.util.concurrent.ConcurrentMap;
  15 import java.util.regex.Pattern;
  16 import org.opendaylight.mdsal.eos.binding.api.EntityOwnershipChange;
  17 import org.opendaylight.mdsal.eos.binding.api.EntityOwnershipListener;
  18 import org.opendaylight.mdsal.eos.binding.api.EntityOwnershipService;
  19 import org.opendaylight.mdsal.eos.common.api.EntityOwnershipState;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.mdsal.core.general.entity.rev150930.Entity;
  21 import org.slf4j.Logger;
  22 import org.slf4j.LoggerFactory;
  23
  24 public class DeviceOwnershipStatusService implements EntityOwnershipListener {
  25     private static final Logger LOG = LoggerFactory.getLogger(DeviceOwnershipStatusService.class);
  26     private static final String SERVICE_ENTITY_TYPE = "org.opendaylight.mdsal.ServiceEntityType";
  27     private static final Pattern NODE_ID_PATTERN = Pattern.compile("^openflow:\\d+");
  28
  29     private final EntityOwnershipService eos;
  30     private final ConcurrentMap<String, EntityOwnershipState> ownershipStateCache = new ConcurrentHashMap<>();
  31
  32     public DeviceOwnershipStatusService(final EntityOwnershipService entityOwnershipService) {
  33         this.eos = entityOwnershipService;
  34         registerEntityOwnershipListener();
  35     }
  36
  37     public boolean isEntityOwned(final String nodeId) {
  38         EntityOwnershipState state = ownershipStateCache.get(nodeId);
  39         if (state == null) {
  40             java.util.Optional<EntityOwnershipState> status = getCurrentOwnershipStatus(nodeId);
  41             if (status.isPresent()) {
  42                 state = status.get();
  43                 ownershipStateCache.put(nodeId, state);
  44             } else {
  45                 LOG.warn("Fetching ownership status failed for node {}", nodeId);
  46             }
  47         }
  48         return state != null && state.equals(EntityOwnershipState.IS_OWNER);
  49     }
  50
  51     public List<String> getOwnedNodes() {
  52         List<String> nodes = new ArrayList<>();
  53         ownershipStateCache.forEach((node, change) -> {
  54             if (isEntityOwned(node)) {
  55                 nodes.add(node);
  56             }
  57         });
  58         return nodes;
  59     }
  60
  61     @Override
  62     public void ownershipChanged(final EntityOwnershipChange ownershipChange) {
  63         final String entityName = ownershipChange.getEntity().getIdentifier().firstKeyOf(Entity.class).getName();
  64         if (entityName != null && isOpenFlowEntity(entityName)) {
  65             LOG.info("Entity ownership change received for node : {} : {}", entityName, ownershipChange);
  66             if (!ownershipChange.getState().isOwner() && !ownershipChange.getState().hasOwner()
  67                     && !ownershipChange.inJeopardy()) {
  68                 LOG.debug("Entity for node {} is unregistered.", entityName);
  69                 ownershipStateCache.remove(entityName);
  70             } else if (!ownershipChange.getState().isOwner() && ownershipChange.getState().hasOwner()) {
  71                 ownershipStateCache.put(entityName, EntityOwnershipState.OWNED_BY_OTHER);
  72             } else if (ownershipChange.getState().isOwner()) {
  73                 ownershipStateCache.put(entityName, EntityOwnershipState.IS_OWNER);
  74             }
  75         }
  76     }
  77
  78     private java.util.Optional<EntityOwnershipState> getCurrentOwnershipStatus(final String nodeId) {
  79         org.opendaylight.mdsal.eos.binding.api.Entity entity = createNodeEntity(nodeId);
  80         Optional<EntityOwnershipState> ownershipStatus = eos.getOwnershipState(entity);
  81
  82         if (ownershipStatus.isPresent()) {
  83             LOG.debug("Fetched ownership status for node {} is {}", nodeId, ownershipStatus.get());
  84             return java.util.Optional.of(ownershipStatus.get());
  85         }
  86         return java.util.Optional.empty();
  87     }
  88
  89     private org.opendaylight.mdsal.eos.binding.api.Entity createNodeEntity(final String nodeId) {
  90         return new org.opendaylight.mdsal.eos.binding.api.Entity(SERVICE_ENTITY_TYPE, nodeId);
  91     }
  92
  93     private void registerEntityOwnershipListener() {
  94         this.eos.registerListener(SERVICE_ENTITY_TYPE, this);
  95     }
  96
  97     private boolean isOpenFlowEntity(String entity) {
  98         return NODE_ID_PATTERN.matcher(entity).matches();
  99     }
 100 }