2 * Copyright (c) 2014 Cisco Systems, Inc. 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.yangtools.yang.model.repo.spi;
10 import static java.util.Objects.requireNonNull;
11 import static org.opendaylight.yangtools.util.concurrent.FluentFutures.immediateFailedFluentFuture;
13 import com.google.common.annotations.Beta;
14 import com.google.common.collect.ArrayListMultimap;
15 import com.google.common.collect.ListMultimap;
16 import com.google.common.util.concurrent.FutureCallback;
17 import com.google.common.util.concurrent.Futures;
18 import com.google.common.util.concurrent.ListenableFuture;
19 import com.google.common.util.concurrent.MoreExecutors;
20 import java.io.Serializable;
21 import java.util.ArrayList;
22 import java.util.Collections;
23 import java.util.Comparator;
24 import java.util.HashMap;
25 import java.util.Iterator;
26 import java.util.List;
28 import org.checkerframework.checker.lock.qual.GuardedBy;
29 import org.eclipse.jdt.annotation.NonNull;
30 import org.opendaylight.yangtools.concepts.AbstractObjectRegistration;
31 import org.opendaylight.yangtools.concepts.Registration;
32 import org.opendaylight.yangtools.yang.model.api.source.SourceIdentifier;
33 import org.opendaylight.yangtools.yang.model.api.source.SourceRepresentation;
34 import org.opendaylight.yangtools.yang.model.repo.api.MissingSchemaSourceException;
35 import org.opendaylight.yangtools.yang.model.repo.api.SchemaRepository;
36 import org.slf4j.Logger;
37 import org.slf4j.LoggerFactory;
40 * Abstract base class for {@link SchemaRepository} implementations. It handles registration and lookup of schema
41 * sources, subclasses need only to provide their own {@link #createEffectiveModelContextFactory()} implementation.
44 public abstract class AbstractSchemaRepository implements SchemaRepository, SchemaSourceRegistry {
45 private static final Logger LOG = LoggerFactory.getLogger(AbstractSchemaRepository.class);
48 * Source identifier -> representation -> provider map. We usually are looking for
49 * a specific representation of a source.
52 private final Map<SourceIdentifier, ListMultimap<Class<? extends SourceRepresentation>,
53 SchemaSourceRegistration>> sources = new HashMap<>();
56 * Schema source listeners.
59 private final List<SchemaListenerRegistration> listeners = new ArrayList<>();
61 private static <T extends SourceRepresentation> ListenableFuture<T> fetchSource(
62 final SourceIdentifier sourceId, final Iterator<SchemaSourceRegistration> it) {
63 final var reg = it.next();
64 @SuppressWarnings("unchecked")
65 final var provider = (SchemaSourceProvider<T>) reg.provider();
67 return Futures.catchingAsync(provider.getSource(sourceId), Throwable.class, input -> {
68 LOG.debug("Failed to acquire source from {}", reg, input);
70 return fetchSource(sourceId, it);
72 throw new MissingSchemaSourceException("All available providers exhausted", sourceId, input);
73 }, MoreExecutors.directExecutor());
77 public <T extends SourceRepresentation> ListenableFuture<T> getSchemaSource(final SourceIdentifier id,
78 final Class<T> representation) {
79 final ArrayList<SchemaSourceRegistration> sortedSchemaSourceRegistrations;
82 final var srcs = sources.get(id);
84 return immediateFailedFluentFuture(new MissingSchemaSourceException(
85 "No providers registered for source " + id, id));
88 sortedSchemaSourceRegistrations = new ArrayList<>(srcs.get(representation));
91 // TODO, remove and make sources keep sorted multimap (e.g. ArrayListMultimap with SortedLists)
92 sortedSchemaSourceRegistrations.sort(SchemaProviderCostComparator.INSTANCE);
94 final var regs = sortedSchemaSourceRegistrations.iterator();
95 if (!regs.hasNext()) {
96 return immediateFailedFluentFuture(new MissingSchemaSourceException(
97 "No providers for source " + id + " representation " + representation + " available", id));
100 final ListenableFuture<T> fetchSourceFuture = fetchSource(id, regs);
101 // Add callback to notify cache listeners about encountered schema
102 Futures.addCallback(fetchSourceFuture, new FutureCallback<T>() {
104 public void onSuccess(final T result) {
105 for (var listener : listeners) {
106 listener.getInstance().schemaSourceEncountered(result);
111 @SuppressWarnings("checkstyle:parameterName")
112 public void onFailure(final Throwable t) {
113 LOG.trace("Skipping notification for encountered source {}, fetching source failed", id, t);
115 }, MoreExecutors.directExecutor());
117 return fetchSourceFuture;
120 private synchronized void addSource(final SchemaSourceRegistration reg) {
121 final var source = reg.getInstance();
122 sources.computeIfAbsent(source.getSourceIdentifier(), ignored -> ArrayListMultimap.create())
123 .put(source.getRepresentation(), reg);
125 final var reps = Collections.<PotentialSchemaSource<?>>singleton(source);
126 for (var l : listeners) {
127 l.getInstance().schemaSourceRegistered(reps);
131 private synchronized void removeSource(final SchemaSourceRegistration reg) {
132 final var source = reg.getInstance();
133 final var m = sources.get(source.getSourceIdentifier());
135 m.remove(source.getRepresentation(), reg);
137 for (var l : listeners) {
138 l.getInstance().schemaSourceUnregistered(source);
142 sources.remove(source.getSourceIdentifier());
148 public <T extends SourceRepresentation> Registration registerSchemaSource(
149 final SchemaSourceProvider<? super T> provider, final PotentialSchemaSource<T> source) {
150 final var ret = new SchemaSourceRegistration(source.cachedReference(), provider);
156 public Registration registerSchemaSourceListener(final SchemaSourceListener listener) {
157 final var ret = new SchemaListenerRegistration(listener);
159 synchronized (this) {
160 final var col = new ArrayList<PotentialSchemaSource<?>>();
161 for (var m : sources.values()) {
162 for (var r : m.values()) {
163 col.add(r.getInstance());
167 // Notify first, so translator-type listeners, who react by registering a source
168 // do not cause infinite loop.
169 listener.schemaSourceRegistered(col);
175 private final class SchemaListenerRegistration extends AbstractObjectRegistration<SchemaSourceListener> {
176 SchemaListenerRegistration(final SchemaSourceListener listener) {
181 protected void removeRegistration() {
182 listeners.remove(this);
186 private final class SchemaSourceRegistration extends AbstractObjectRegistration<PotentialSchemaSource<?>> {
187 private final @NonNull SchemaSourceProvider<?> provider;
189 SchemaSourceRegistration(final PotentialSchemaSource<?> source, final SchemaSourceProvider<?> provider) {
191 this.provider = requireNonNull(provider);
194 @NonNull SchemaSourceProvider<?> provider() {
199 protected void removeRegistration() {
204 private static final class SchemaProviderCostComparator
205 implements Comparator<SchemaSourceRegistration>, Serializable {
206 static final SchemaProviderCostComparator INSTANCE = new SchemaProviderCostComparator();
209 private static final long serialVersionUID = 1L;
212 public int compare(final SchemaSourceRegistration o1, final SchemaSourceRegistration o2) {
213 return o1.getInstance().getCost() - o2.getInstance().getCost();
217 private Object readResolve() {