sxp-integration/sxp-ep-provider/src/main/java/org/opendaylight/groupbasedpolicy/sxp/ep/provider/impl/dao/EPPolicyTemplateDaoImpl.java

   1 /*
   2  * Copyright (c) 2016 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.groupbasedpolicy.sxp.ep.provider.impl.dao;
   9
  10 import com.google.common.base.Function;
  11 import com.google.common.base.Optional;
  12 import com.google.common.base.Predicate;
  13 import com.google.common.base.Predicates;
  14 import com.google.common.util.concurrent.CheckedFuture;
  15 import com.google.common.util.concurrent.Futures;
  16 import com.google.common.util.concurrent.ListenableFuture;
  17 import java.util.ArrayList;
  18 import java.util.Collection;
  19 import javax.annotation.Nonnull;
  20 import javax.annotation.Nullable;
  21 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  22 import org.opendaylight.controller.md.sal.binding.api.ReadOnlyTransaction;
  23 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  24 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  25 import org.opendaylight.groupbasedpolicy.sxp.ep.provider.impl.DSAsyncDao;
  26 import org.opendaylight.groupbasedpolicy.sxp.ep.provider.impl.EPTemplateListener;
  27 import org.opendaylight.groupbasedpolicy.sxp.ep.provider.impl.ReadableByKey;
  28 import org.opendaylight.groupbasedpolicy.sxp.ep.provider.impl.SimpleCachedDao;
  29 import org.opendaylight.groupbasedpolicy.sxp.ep.provider.impl.util.SxpListenerUtil;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.config.groupbasedpolicy.sxp.ep.provider.model.rev160302.sxp.ep.mapper.EndpointPolicyTemplateBySgt;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.config.groupbasedpolicy.sxp.ep.provider.model.rev160302.sxp.ep.mapper.EndpointPolicyTemplateBySgtKey;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.sxp.database.rev160308.Sgt;
  33 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  34
  35
  36 /**
  37  * Purpose: general dao for EndPoint templates
  38  */
  39 public class EPPolicyTemplateDaoImpl implements DSAsyncDao<Sgt, EndpointPolicyTemplateBySgt>,
  40         ReadableByKey<EpPolicyTemplateValueKey, EndpointPolicyTemplateBySgt> {
  41
  42     private static final ListenableFuture<Optional<EndpointPolicyTemplateBySgt>> READ_FUTURE_ABSENT = Futures.immediateFuture(Optional.absent());
  43
  44     private final DataBroker dataBroker;
  45     private final SimpleCachedDao<Sgt, EndpointPolicyTemplateBySgt> cachedDao;
  46     private final EpPolicyTemplateValueKeyFactory keyFactory;
  47
  48     public EPPolicyTemplateDaoImpl(final DataBroker dataBroker,
  49                                    final SimpleCachedDao<Sgt, EndpointPolicyTemplateBySgt> cachedDao,
  50                                    final EpPolicyTemplateValueKeyFactory keyFactory) {
  51         this.dataBroker = dataBroker;
  52         this.cachedDao = cachedDao;
  53         this.keyFactory = keyFactory;
  54     }
  55
  56     @Override
  57     public ListenableFuture<Optional<EndpointPolicyTemplateBySgt>> read(@Nonnull final Sgt key) {
  58         final Optional<EndpointPolicyTemplateBySgt> cachedEndpointPolicyTemplateBySgtalue = lookup(cachedDao, key);
  59         if (cachedEndpointPolicyTemplateBySgtalue.isPresent()) {
  60             return Futures.immediateFuture(cachedEndpointPolicyTemplateBySgtalue);
  61         } else if (!cachedDao.isEmpty()) {
  62             return READ_FUTURE_ABSENT;
  63         } else {
  64             final ReadOnlyTransaction rTx = dataBroker.newReadOnlyTransaction();
  65             final CheckedFuture<Optional<EndpointPolicyTemplateBySgt>, ReadFailedException> read =
  66                     rTx.read(LogicalDatastoreType.CONFIGURATION, buildReadPath(key));
  67
  68             Futures.addCallback(read, SxpListenerUtil.createTxCloseCallback(rTx));
  69
  70             return Futures.transform(read, new Function<Optional<EndpointPolicyTemplateBySgt>, Optional<EndpointPolicyTemplateBySgt>>() {
  71                 @Nullable
  72                 @Override
  73                 public Optional<EndpointPolicyTemplateBySgt> apply(@Nullable final Optional<EndpointPolicyTemplateBySgt> input) {
  74                     if (input.isPresent()) {
  75                         cachedDao.update(key, keyFactory.sortValueKeyLists(input.get()));
  76                     }
  77                     return input;
  78                 }
  79             });
  80         }
  81     }
  82
  83     protected InstanceIdentifier<EndpointPolicyTemplateBySgt> buildReadPath(final Sgt key) {
  84         return EPTemplateListener.SXP_MAPPER_TEMPLATE_PARENT_PATH
  85                 .child(EndpointPolicyTemplateBySgt.class, new EndpointPolicyTemplateBySgtKey(key));
  86     }
  87
  88     private Optional<EndpointPolicyTemplateBySgt> lookup(final SimpleCachedDao<Sgt, EndpointPolicyTemplateBySgt> cachedDao, final Sgt key) {
  89         return cachedDao.find(key);
  90     }
  91
  92     @Override
  93     public Collection<EndpointPolicyTemplateBySgt> readBy(@Nonnull final EpPolicyTemplateValueKey specialKey) {
  94         final Predicate<EpPolicyTemplateValueKey> templateValuePredicate = Predicates.equalTo(specialKey);
  95         final Collection<EndpointPolicyTemplateBySgt> foundTemplates = new ArrayList<>();
  96
  97         for (EndpointPolicyTemplateBySgt epPolicyTemplate : cachedDao.values()) {
  98             final EpPolicyTemplateValueKey templateValueKey = keyFactory.createKeyWithDefaultOrdering(epPolicyTemplate);
  99             if (templateValuePredicate.apply(templateValueKey)) {
 100                 foundTemplates.add(epPolicyTemplate);
 101             }
 102         }
 103
 104         return foundTemplates;
 105     }
 106 }