2 * Copyright (c) 2022 PANTHEON.tech, s.r.o. and others. All rights reserved.
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
8 package org.opendaylight.restconf.server.api;
10 import static java.util.Objects.requireNonNull;
12 import java.lang.invoke.MethodHandles;
13 import java.lang.invoke.VarHandle;
14 import org.eclipse.jdt.annotation.NonNull;
15 import org.opendaylight.yangtools.yang.data.api.schema.MountPointContext;
16 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactory;
17 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
18 import org.opendaylight.yangtools.yang.data.codec.xml.XmlCodecFactory;
19 import org.opendaylight.yangtools.yang.data.util.DataSchemaContextTree;
20 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
23 * An immutable context holding a consistent view of things related to data bind operations.
25 public final class DatabindContext {
26 private static final VarHandle JSON_CODECS;
27 private static final VarHandle XML_CODECS;
28 private static final VarHandle SCHEMA_TREE;
31 final var lookup = MethodHandles.lookup();
33 JSON_CODECS = lookup.findVarHandle(DatabindContext.class, "jsonCodecs", JSONCodecFactory.class);
34 XML_CODECS = lookup.findVarHandle(DatabindContext.class, "xmlCodecs", XmlCodecFactory.class);
35 SCHEMA_TREE = lookup.findVarHandle(DatabindContext.class, "schemaTree", DataSchemaContextTree.class);
36 } catch (NoSuchFieldException | IllegalAccessException e) {
37 throw new ExceptionInInitializerError(e);
41 private final @NonNull MountPointContext mountContext;
43 @SuppressWarnings("unused")
44 private volatile DataSchemaContextTree schemaTree;
45 @SuppressWarnings("unused")
46 private volatile JSONCodecFactory jsonCodecs;
47 @SuppressWarnings("unused")
48 private volatile XmlCodecFactory xmlCodecs;
50 private DatabindContext(final @NonNull MountPointContext mountContext) {
51 this.mountContext = requireNonNull(mountContext);
54 public static @NonNull DatabindContext ofModel(final EffectiveModelContext modelContext) {
55 return ofMountPoint(MountPointContext.of(modelContext));
58 public static @NonNull DatabindContext ofMountPoint(final MountPointContext mountContext) {
59 return new DatabindContext(mountContext);
62 public @NonNull EffectiveModelContext modelContext() {
63 return mountContext.getEffectiveModelContext();
66 public @NonNull DataSchemaContextTree schemaTree() {
67 final var existing = (DataSchemaContextTree) SCHEMA_TREE.getAcquire(this);
68 return existing != null ? existing : createSchemaTree();
71 private @NonNull DataSchemaContextTree createSchemaTree() {
72 final var created = DataSchemaContextTree.from(modelContext());
73 final var witness = (DataSchemaContextTree) SCHEMA_TREE.compareAndExchangeRelease(this, null, created);
74 return witness != null ? witness : created;
77 public @NonNull JSONCodecFactory jsonCodecs() {
78 final var existing = (JSONCodecFactory) JSON_CODECS.getAcquire(this);
79 return existing != null ? existing : createJsonCodecs();
82 private @NonNull JSONCodecFactory createJsonCodecs() {
83 final var created = JSONCodecFactorySupplier.RFC7951.getShared(mountContext.getEffectiveModelContext());
84 final var witness = (JSONCodecFactory) JSON_CODECS.compareAndExchangeRelease(this, null, created);
85 return witness != null ? witness : created;
88 public @NonNull XmlCodecFactory xmlCodecs() {
89 final var existing = (XmlCodecFactory) XML_CODECS.getAcquire(this);
90 return existing != null ? existing : createXmlCodecs();
93 private @NonNull XmlCodecFactory createXmlCodecs() {
94 final var created = XmlCodecFactory.create(mountContext);
95 final var witness = (XmlCodecFactory) XML_CODECS.compareAndExchangeRelease(this, null, created);
96 return witness != null ? witness : created;