binding2/mdsal-binding2-dom-codec/src/main/java/org/opendaylight/mdsal/binding/javav2/dom/codec/impl/cache/BindingNormalizedNodeCache.java

   1 /*
   2  * Copyright (c) 2017 Pantheon Technologies s.r.o. 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.mdsal.binding.javav2.dom.codec.impl.cache;
   9
  10 import com.google.common.annotations.Beta;
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.cache.CacheBuilder;
  13 import com.google.common.cache.CacheLoader;
  14 import com.google.common.cache.LoadingCache;
  15 import javax.annotation.Nonnull;
  16 import org.opendaylight.mdsal.binding.javav2.dom.codec.impl.context.base.DataContainerCodecContext;
  17 import org.opendaylight.mdsal.binding.javav2.dom.codec.impl.serializer.CachingNormalizedNodeSerializer;
  18 import org.opendaylight.mdsal.binding.javav2.spec.base.TreeNode;
  19 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  20
  21 /**
  22  * Cached NormalizedNode representation of TreeNode.
  23  */
  24 @Beta
  25 public class BindingNormalizedNodeCache extends CacheLoader<TreeNode, NormalizedNode<?, ?>> {
  26
  27     @SuppressWarnings("rawtypes")
  28     private final DataContainerCodecContext subtreeRoot;
  29     private final AbstractBindingNormalizedNodeCacheHolder cacheHolder;
  30     private final LoadingCache<TreeNode, NormalizedNode<?, ?>> cache =
  31             CacheBuilder.newBuilder().weakValues().build(this);
  32
  33     public BindingNormalizedNodeCache(@Nonnull final AbstractBindingNormalizedNodeCacheHolder cacheHolder,
  34             @Nonnull final DataContainerCodecContext<?, ?> subtreeRoot) {
  35         this.cacheHolder = Preconditions.checkNotNull(cacheHolder, "cacheHolder");
  36         this.subtreeRoot = Preconditions.checkNotNull(subtreeRoot, "subtreeRoot");
  37     }
  38
  39     @Override
  40     public NormalizedNode<?, ?> load(@Nonnull final TreeNode key) throws Exception {
  41         return CachingNormalizedNodeSerializer.serializeUsingStreamWriter(cacheHolder, subtreeRoot, key);
  42     }
  43
  44     /**
  45      * Returns cached NormalizedNode representation of TreeNode.
  46      *
  47      * If representation is not cached, serializes TreeNode and updates cache
  48      * with representation.
  49      *
  50      * @param obj
  51      *            - binding object to be deserialized
  52      * @return NormalizedNode representation of binding object
  53      */
  54     public NormalizedNode<?, ?> get(final TreeNode obj) {
  55         return cache.getUnchecked(obj);
  56     }
  57 }