infra/cfg-init/src/main/java/io/fd/honeycomb/data/init/RestoringInitializer.java

   1 /*
   2  * Copyright (c) 2016 Cisco and/or its affiliates.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package io.fd.honeycomb.data.init;
  18
  19 import static com.google.common.base.Preconditions.checkArgument;
  20
  21 import io.fd.honeycomb.translate.util.JsonUtils;
  22 import java.io.IOException;
  23 import java.nio.file.Files;
  24 import java.nio.file.Path;
  25 import java.nio.file.StandardOpenOption;
  26 import javax.annotation.Nonnull;
  27 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  28 import org.opendaylight.controller.md.sal.common.api.data.TransactionCommitFailedException;
  29 import org.opendaylight.controller.md.sal.dom.api.DOMDataBroker;
  30 import org.opendaylight.controller.md.sal.dom.api.DOMDataWriteTransaction;
  31 import org.opendaylight.controller.sal.core.api.model.SchemaService;
  32 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  33 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  34 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
  35 import org.slf4j.Logger;
  36 import org.slf4j.LoggerFactory;
  37
  38 public class RestoringInitializer implements DataTreeInitializer {
  39
  40     private static final Logger LOG = LoggerFactory.getLogger(RestoringInitializer.class);
  41
  42     private final SchemaService schemaService;
  43     private final Path path;
  44     private final DOMDataBroker dataTree;
  45     private final RestorationType restorationType;
  46     private final LogicalDatastoreType datastoreType;
  47
  48     public RestoringInitializer(@Nonnull final SchemaService schemaService,
  49                                 @Nonnull final Path path,
  50                                 @Nonnull final DOMDataBroker dataTree,
  51                                 @Nonnull final RestorationType restorationType,
  52                                 @Nonnull final LogicalDatastoreType datastoreType) {
  53         this.schemaService = schemaService;
  54         this.datastoreType = datastoreType;
  55         this.path = checkStorage(path);
  56         this.dataTree = dataTree;
  57         this.restorationType = restorationType;
  58     }
  59
  60     private Path checkStorage(final Path path) {
  61         if (Files.exists(path)) {
  62             checkArgument(!Files.isDirectory(path), "File %s is a directory", path);
  63             checkArgument(Files.isReadable(path), "File %s is not readable", path);
  64         }
  65
  66         return path;
  67     }
  68
  69     @Override
  70     public void initialize() throws InitializeException {
  71         LOG.debug("Starting restoration of {} from {} using {}", dataTree, path, restorationType);
  72         if (!Files.exists(path)) {
  73             LOG.debug("Persist file {} does not exist. Skipping restoration", path);
  74             return;
  75         }
  76
  77         try {
  78             final ContainerNode containerNode = JsonUtils
  79                 .readJsonRoot(schemaService.getGlobalContext(), Files.newInputStream(path, StandardOpenOption.READ));
  80
  81             final DOMDataWriteTransaction domDataWriteTransaction = dataTree.newWriteOnlyTransaction();
  82             for (DataContainerChild<? extends YangInstanceIdentifier.PathArgument, ?> dataContainerChild : containerNode
  83                 .getValue()) {
  84                 final YangInstanceIdentifier iid = YangInstanceIdentifier.create(dataContainerChild.getIdentifier());
  85                 LOG.trace("Restoring {} from {}", iid, path);
  86
  87                 switch (restorationType) {
  88                     case Merge:
  89                         domDataWriteTransaction.merge(datastoreType, iid, dataContainerChild);
  90                         break;
  91                     case Put:
  92                         domDataWriteTransaction.put(datastoreType, iid, dataContainerChild);
  93                         break;
  94                     default:
  95                         throw new InitializeException(
  96                             "Unable to initialize data using " + restorationType + " restoration strategy. Unsupported");
  97                 }
  98             }
  99
 100             // Block here to prevent subsequent initializers processing before context is fully restored
 101             domDataWriteTransaction.submit().checkedGet();
 102             LOG.debug("Data from {} restored successfully", path);
 103
 104         } catch (IOException | TransactionCommitFailedException e) {
 105             throw new InitializeException("Unable to restore data from " + path, e);
 106         }
 107     }
 108
 109     /**
 110      * Type of operation to use when writing restored data.
 111      */
 112     public static enum RestorationType {
 113         Put, Merge
 114     }
 115 }