openflowplugin-impl/src/main/java/org/opendaylight/openflowplugin/impl/role/RoleContextImpl.java

   1 /**
   2  * Copyright (c) 2015 Cisco Systems, Inc. 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.impl.role;
   9
  10 import com.google.common.base.Preconditions;
  11
  12 import java.util.concurrent.Semaphore;
  13 import java.util.concurrent.TimeUnit;
  14 import javax.annotation.Nonnull;
  15 import javax.annotation.Nullable;
  16
  17 import org.opendaylight.controller.md.sal.common.api.clustering.CandidateAlreadyRegisteredException;
  18 import org.opendaylight.controller.md.sal.common.api.clustering.Entity;
  19 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipCandidateRegistration;
  20 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipService;
  21 import org.opendaylight.openflowplugin.api.openflow.device.RequestContext;
  22 import org.opendaylight.openflowplugin.api.openflow.lifecycle.LifecycleConductor;
  23 import org.opendaylight.openflowplugin.api.openflow.role.RoleContext;
  24 import org.opendaylight.openflowplugin.impl.LifecycleConductorImpl;
  25 import org.opendaylight.openflowplugin.impl.rpc.AbstractRequestContext;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeId;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.role.service.rev150727.SalRoleService;
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30
  31 /**
  32  * Role context hold information about entity ownership registration,
  33  * register and unregister candidate (main and tx)
  34  */
  35 class RoleContextImpl implements RoleContext {
  36
  37     private static final Logger LOG = LoggerFactory.getLogger(RoleContextImpl.class);
  38     private static final int TIMEOUT = 12;
  39
  40     private final NodeId nodeId;
  41     private final EntityOwnershipService entityOwnershipService;
  42     private volatile EntityOwnershipCandidateRegistration entityOwnershipCandidateRegistration = null;
  43     private volatile EntityOwnershipCandidateRegistration txEntityOwnershipCandidateRegistration = null;
  44
  45     private final Entity entity;
  46     private final Entity txEntity;
  47
  48     private SalRoleService salRoleService = null;
  49
  50     private final Semaphore roleChangeGuard = new Semaphore(1, true);
  51
  52     private final LifecycleConductor conductor;
  53
  54     public RoleContextImpl(final NodeId nodeId, final EntityOwnershipService entityOwnershipService, final Entity entity, final Entity txEntity, final LifecycleConductor lifecycleConductor) {
  55         this.entityOwnershipService = entityOwnershipService;
  56         this.entity = entity;
  57         this.txEntity = txEntity;
  58         this.nodeId = nodeId;
  59         this.conductor = lifecycleConductor;
  60     }
  61
  62     @Override
  63     public boolean initialization() {
  64         LOG.info("Initialization main candidate for node {}", nodeId);
  65         return registerCandidate(this.entity);
  66     }
  67
  68     @Override
  69     public void unregisterAllCandidates() {
  70         LOG.info("Role context closed, unregistering all candidates for ownership for node {}", nodeId);
  71         if (isMainCandidateRegistered()) {
  72             unregisterCandidate(this.entity);
  73         }
  74         if (isTxCandidateRegistered()) {
  75             unregisterCandidate(this.txEntity);
  76         }
  77     }
  78
  79     @Nullable
  80     @Override
  81     public <T> RequestContext<T> createRequestContext() {
  82         return new AbstractRequestContext<T>(conductor.reserveXidForDeviceMessage(nodeId)) {
  83             @Override
  84             public void close() {
  85             }
  86         };
  87     }
  88
  89     @Override
  90     public void setSalRoleService(@Nonnull final SalRoleService salRoleService) {
  91         Preconditions.checkNotNull(salRoleService);
  92         this.salRoleService = salRoleService;
  93     }
  94
  95     @Override
  96     public SalRoleService getSalRoleService() {
  97         return this.salRoleService;
  98     }
  99
 100     @Override
 101     public Entity getEntity() {
 102         return this.entity;
 103     }
 104
 105     @Override
 106     public Entity getTxEntity() {
 107         return this.txEntity;
 108     }
 109
 110     @Override
 111     public NodeId getNodeId() {
 112         return nodeId;
 113     }
 114
 115     @Override
 116     public boolean isMainCandidateRegistered() {
 117         return entityOwnershipCandidateRegistration != null;
 118     }
 119
 120     @Override
 121     public boolean isTxCandidateRegistered() {
 122         return txEntityOwnershipCandidateRegistration != null;
 123     }
 124
 125     @Override
 126     public boolean registerCandidate(final Entity entity_) {
 127         boolean permit = false;
 128         try {
 129             permit = roleChangeGuard.tryAcquire(TIMEOUT, TimeUnit.SECONDS);
 130             if(permit) {
 131                 LOG.debug("Register candidate for entity {}", entity_);
 132                 if (entity_.equals(this.entity)) {
 133                     entityOwnershipCandidateRegistration = entityOwnershipService.registerCandidate(entity_);
 134                 } else {
 135                     txEntityOwnershipCandidateRegistration = entityOwnershipService.registerCandidate(entity_);
 136                 }
 137             } else {
 138                 return false;
 139             }
 140         } catch (final CandidateAlreadyRegisteredException e) {
 141             LOG.warn("Candidate for entity {} is already registered.", entity_.getType());
 142             return false;
 143         } catch (final InterruptedException e) {
 144             LOG.warn("Cannot acquire semaphore for register entity {} candidate.", entity_.getType());
 145             return false;
 146         } finally {
 147             if (permit) {
 148                 roleChangeGuard.release();
 149             }
 150         }
 151         return true;
 152     }
 153
 154     @Override
 155     public boolean unregisterCandidate(final Entity entity_) {
 156         boolean permit = false;
 157         try {
 158             permit = roleChangeGuard.tryAcquire(TIMEOUT, TimeUnit.SECONDS);
 159             if(permit) {
 160                 if (entity_.equals(this.entity)) {
 161                     if (entityOwnershipCandidateRegistration != null) {
 162                         LOG.debug("Unregister candidate for entity {}", entity_);
 163                         entityOwnershipCandidateRegistration.close();
 164                         entityOwnershipCandidateRegistration = null;
 165                     }
 166                 } else {
 167                     if (txEntityOwnershipCandidateRegistration != null) {
 168                         LOG.debug("Unregister candidate for tx entity {}", entity_);
 169                         txEntityOwnershipCandidateRegistration.close();
 170                         txEntityOwnershipCandidateRegistration = null;
 171                     }
 172                 }
 173             } else {
 174                 return false;
 175             }
 176         } catch (final InterruptedException e) {
 177             LOG.warn("Cannot acquire semaphore for unregister entity {} candidate.", entity_.getType());
 178             return false;
 179         } finally {
 180             if (permit) {
 181                 roleChangeGuard.release();
 182             }
 183         }
 184         return true;
 185     }
 186
 187     @Override
 188     public void close() {
 189         unregisterAllCandidates();
 190     }
 191
 192     public boolean isMaster(){
 193         return (txEntityOwnershipCandidateRegistration != null && entityOwnershipCandidateRegistration != null);
 194     }
 195 }