dom/mdsal-dom-broker/src/main/java/org/opendaylight/mdsal/dom/broker/schema/ScanningSchemaServiceProvider.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.dom.broker.schema;
   9
  10 import com.google.common.annotations.VisibleForTesting;
  11 import com.google.common.collect.Iterables;
  12 import com.google.common.util.concurrent.ListenableFuture;
  13 import java.io.IOException;
  14 import java.net.URL;
  15 import java.util.ArrayList;
  16 import java.util.List;
  17 import java.util.Optional;
  18 import javax.annotation.concurrent.GuardedBy;
  19 import org.opendaylight.mdsal.dom.spi.AbstractDOMSchemaService;
  20 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  21 import org.opendaylight.yangtools.concepts.Registration;
  22 import org.opendaylight.yangtools.util.ListenerRegistry;
  23 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  24 import org.opendaylight.yangtools.yang.model.api.SchemaContextListener;
  25 import org.opendaylight.yangtools.yang.model.parser.api.YangSyntaxErrorException;
  26 import org.opendaylight.yangtools.yang.model.repo.api.SchemaSourceException;
  27 import org.opendaylight.yangtools.yang.model.repo.api.SourceIdentifier;
  28 import org.opendaylight.yangtools.yang.model.repo.api.YangTextSchemaSource;
  29 import org.opendaylight.yangtools.yang.parser.repo.YangTextSchemaContextResolver;
  30 import org.slf4j.Logger;
  31 import org.slf4j.LoggerFactory;
  32
  33 public class ScanningSchemaServiceProvider extends AbstractDOMSchemaService.WithYangTextSources
  34         implements AutoCloseable {
  35     private static final Logger LOG = LoggerFactory.getLogger(ScanningSchemaServiceProvider.class);
  36
  37     private final YangTextSchemaContextResolver contextResolver = YangTextSchemaContextResolver.create("global-bundle");
  38     @GuardedBy("lock")
  39     private final ListenerRegistry<SchemaContextListener> listeners = ListenerRegistry.create();
  40     private final Object lock = new Object();
  41
  42     public void tryToUpdateSchemaContext() {
  43         synchronized (lock) {
  44             final Optional<SchemaContext> schema = contextResolver.getSchemaContext();
  45             if (schema.isPresent()) {
  46                 if (LOG.isDebugEnabled()) {
  47                     LOG.debug("Got new SchemaContext: # of modules {}", schema.get().getModules().size());
  48                 }
  49                 notifyListeners(schema.get());
  50             }
  51         }
  52     }
  53
  54     @VisibleForTesting
  55     @SuppressWarnings("checkstyle:IllegalCatch")
  56     public void notifyListeners(final SchemaContext schemaContext) {
  57         synchronized (lock) {
  58             for (final ListenerRegistration<SchemaContextListener> registration : listeners) {
  59                 try {
  60                     registration.getInstance().onGlobalContextUpdated(schemaContext);
  61                 } catch (final Exception e) {
  62                     LOG.error("Exception occured during invoking listener", e);
  63                 }
  64             }
  65         }
  66     }
  67
  68     public List<Registration> registerAvailableYangs(final List<URL> yangs) {
  69         final List<Registration> sourceRegistrator = new ArrayList<>();
  70         for (final URL url : yangs) {
  71             try {
  72                 sourceRegistrator.add(contextResolver.registerSource(url));
  73             } catch (SchemaSourceException | IOException | YangSyntaxErrorException e) {
  74                 LOG.warn("Failed to register {}, ignoring it", url, e);
  75             }
  76         }
  77         return sourceRegistrator;
  78     }
  79
  80     public void removeListener(final SchemaContextListener schemaContextListener) {
  81         synchronized (lock) {
  82             for (final ListenerRegistration<SchemaContextListener> listenerRegistration : listeners.getListeners()) {
  83                 if (listenerRegistration.getInstance().equals(schemaContextListener)) {
  84                     listenerRegistration.close();
  85                     break;
  86                 }
  87             }
  88         }
  89     }
  90
  91     public boolean hasListeners() {
  92         synchronized (lock) {
  93             return !Iterables.isEmpty(listeners.getListeners());
  94         }
  95     }
  96
  97     @Override
  98     public SchemaContext getGlobalContext() {
  99         return contextResolver.getSchemaContext().orElse(null);
 100     }
 101
 102     @Override
 103     public ListenerRegistration<SchemaContextListener> registerSchemaContextListener(
 104             final SchemaContextListener listener) {
 105         synchronized (lock) {
 106             contextResolver.getSchemaContext().ifPresent(listener::onGlobalContextUpdated);
 107             return listeners.register(listener);
 108         }
 109     }
 110
 111     @Override
 112     public ListenableFuture<? extends YangTextSchemaSource> getSource(final SourceIdentifier sourceIdentifier) {
 113         return contextResolver.getSource(sourceIdentifier);
 114     }
 115
 116     @Override
 117     public void close() {
 118         synchronized (lock) {
 119             listeners.forEach(ListenerRegistration::close);
 120         }
 121     }
 122 }