opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/sharding/DistributedShardModification.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
   9 package org.opendaylight.controller.cluster.sharding;
  10
  11 import com.google.common.base.Preconditions;
  12 import java.util.Map;
  13 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  14 import org.opendaylight.mdsal.dom.api.DOMDataTreeWriteCursor;
  15 import org.opendaylight.mdsal.dom.spi.shard.ForeignShardModificationContext;
  16 import org.opendaylight.mdsal.dom.spi.shard.WritableNodeOperation;
  17 import org.opendaylight.mdsal.dom.spi.shard.WriteCursorStrategy;
  18 import org.opendaylight.mdsal.dom.spi.shard.WriteableModificationNode;
  19 import org.opendaylight.mdsal.dom.spi.shard.WriteableNodeWithSubshard;
  20 import org.opendaylight.mdsal.dom.spi.store.DOMStoreThreePhaseCommitCohort;
  21 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  22
  23 /**
  24  * Shard modification that consists of the whole shard context, provides cursors which correctly delegate to subshards
  25  * if any are present.
  26  */
  27 public class DistributedShardModification extends WriteableNodeWithSubshard {
  28
  29     private final DistributedShardModificationContext context;
  30     private final Map<DOMDataTreeIdentifier, ForeignShardModificationContext> childShards;
  31
  32     public DistributedShardModification(final DistributedShardModificationContext context,
  33                                         final Map<PathArgument, WriteableModificationNode> subshards,
  34                                         final Map<DOMDataTreeIdentifier, ForeignShardModificationContext> childShards) {
  35         super(subshards);
  36         this.context = Preconditions.checkNotNull(context);
  37         this.childShards = Preconditions.checkNotNull(childShards);
  38     }
  39
  40     @Override
  41     public PathArgument getIdentifier() {
  42         return context.getIdentifier().getRootIdentifier().getLastPathArgument();
  43     }
  44
  45     @Override
  46     public WriteCursorStrategy createOperation(final DOMDataTreeWriteCursor parentCursor) {
  47         return new WritableNodeOperation(this, context.cursor()) {
  48             @Override
  49             public void exit() {
  50                 throw new IllegalStateException("Can not exit data tree root");
  51             }
  52         };
  53     }
  54
  55     void cursorClosed() {
  56         context.closeCursor();
  57     }
  58
  59     DOMStoreThreePhaseCommitCohort seal() {
  60         childShards.values().stream().filter(ForeignShardModificationContext::isModified)
  61                 .forEach(ForeignShardModificationContext::ready);
  62
  63         return context.ready();
  64     }
  65
  66     DOMDataTreeIdentifier getPrefix() {
  67         return context.getIdentifier();
  68     }
  69
  70     Map<DOMDataTreeIdentifier, ForeignShardModificationContext> getChildShards() {
  71         return childShards;
  72     }
  73 }