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.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.data.init.rev160407.RestorationType;
  33 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  34 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  35 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
  36 import org.slf4j.Logger;
  37 import org.slf4j.LoggerFactory;
  38
  39 public class RestoringInitializer implements DataTreeInitializer {
  40
  41     private static final Logger LOG = LoggerFactory.getLogger(RestoringInitializer.class);
  42
  43     private final SchemaService schemaService;
  44     private final Path path;
  45     private final DOMDataBroker dataTree;
  46     private final RestorationType restorationType;
  47     private final LogicalDatastoreType datastoreType;
  48
  49     public RestoringInitializer(@Nonnull final SchemaService schemaService,
  50                                 @Nonnull final Path path,
  51                                 @Nonnull final DOMDataBroker dataTree,
  52                                 @Nonnull final RestorationType restorationType,
  53                                 @Nonnull final LogicalDatastoreType datastoreType) {
  54         this.schemaService = schemaService;
  55         this.datastoreType = datastoreType;
  56         this.path = checkStorage(path);
  57         this.dataTree = dataTree;
  58         this.restorationType = restorationType;
  59     }
  60
  61     private Path checkStorage(final Path path) {
  62         if (Files.exists(path)) {
  63             checkArgument(!Files.isDirectory(path), "File %s is a directory", path);
  64             checkArgument(Files.isReadable(path), "File %s is not readable", path);
  65         }
  66
  67         return path;
  68     }
  69
  70     @Override
  71     public void initialize() throws InitializeException {
  72         LOG.debug("Starting restoration of {} from {} using {}", dataTree, path, restorationType);
  73         if(!Files.exists(path)) {
  74             LOG.debug("Persist file {} does not exist. Skipping restoration", path);
  75             return;
  76         }
  77
  78         try {
  79             final ContainerNode containerNode = JsonUtils
  80                 .readJsonRoot(schemaService.getGlobalContext(), Files.newInputStream(path, StandardOpenOption.READ));
  81
  82             final DOMDataWriteTransaction domDataWriteTransaction = dataTree.newWriteOnlyTransaction();
  83             for (DataContainerChild<? extends YangInstanceIdentifier.PathArgument, ?> dataContainerChild : containerNode
  84                 .getValue()) {
  85                 final YangInstanceIdentifier iid = YangInstanceIdentifier.create(dataContainerChild.getIdentifier());
  86                 LOG.trace("Restoring {} from {}", iid, path);
  87
  88                 switch (restorationType) {
  89                     case Merge:
  90                         domDataWriteTransaction.merge(datastoreType, iid, dataContainerChild);
  91                         break;
  92                     case Put:
  93                         domDataWriteTransaction.put(datastoreType, iid, dataContainerChild);
  94                         break;
  95                     default:
  96                         throw new InitializeException(
  97                             "Unable to initialize data using " + restorationType + " restoration strategy. Unsupported");
  98                 }
  99             }
 100
 101             // Block here to prevent subsequent initializers processing before context is fully restored
 102             domDataWriteTransaction.submit().checkedGet();
 103             LOG.debug("Data from {} restored successfully", path);
 104
 105         } catch (IOException | TransactionCommitFailedException e) {
 106             throw new InitializeException("Unable to restore data from " + path, e);
 107         }
 108     }
 109
 110     @Override
 111     public void close() {}
 112 }