opendaylight/md-sal/sal-binding-broker/src/main/java/org/opendaylight/controller/md/sal/binding/impl/BindingToNormalizedNodeCodecFactory.java

   1 /*
   2  * Copyright (c) 2015 Brocade Communications 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.controller.md.sal.binding.impl;
   9
  10 import java.util.concurrent.atomic.AtomicBoolean;
  11 import org.opendaylight.controller.sal.binding.codegen.impl.SingletonHolder;
  12 import org.opendaylight.controller.sal.core.api.model.SchemaService;
  13 import org.opendaylight.yangtools.binding.data.codec.gen.impl.StreamWriterGenerator;
  14 import org.opendaylight.yangtools.binding.data.codec.impl.BindingNormalizedNodeCodecRegistry;
  15 import org.opendaylight.yangtools.sal.binding.generator.api.ClassLoadingStrategy;
  16
  17 /**
  18  * Factory class for creating and initializing the global BindingToNormalizedNodeCodec instance.
  19  *
  20  * @author Thomas Pantelis
  21  */
  22 public class BindingToNormalizedNodeCodecFactory {
  23     private static final AtomicBoolean INSTANCE_CREATED = new AtomicBoolean();
  24     private static volatile BindingToNormalizedNodeCodec instance;
  25
  26     /**
  27      * Returns the global BindingToNormalizedNodeCodec instance, creating if necessary. The returned instance
  28      * is registered with tthe SchemaService as a SchemaContextListener.
  29      *
  30      * @param classLoadingStrategy
  31      * @param schemaService
  32      * @return the BindingToNormalizedNodeCodec instance
  33      */
  34     public static BindingToNormalizedNodeCodec getOrCreateInstance(ClassLoadingStrategy classLoadingStrategy,
  35             SchemaService schemaService) {
  36         if(!INSTANCE_CREATED.compareAndSet(false, true)) {
  37             return instance;
  38         }
  39
  40         BindingNormalizedNodeCodecRegistry codecRegistry = new BindingNormalizedNodeCodecRegistry(
  41                 StreamWriterGenerator.create(SingletonHolder.JAVASSIST));
  42         BindingToNormalizedNodeCodec localInstance = new BindingToNormalizedNodeCodec(
  43                 classLoadingStrategy, codecRegistry, true);
  44
  45         schemaService.registerSchemaContextListener(localInstance);
  46
  47         // Publish the BindingToNormalizedNodeCodec instance after we've registered it as a
  48         // SchemaContextListener to avoid a race condition by publishing it too early when it isn't
  49         // fully initialized.
  50         instance = localInstance;
  51         return instance;
  52     }
  53
  54     public static BindingToNormalizedNodeCodec getInstance() {
  55         return instance;
  56     }
  57 }