opendaylight/netconf/mdsal-netconf-connector/src/main/java/org/opendaylight/controller/netconf/mdsal/connector/CurrentSchemaContext.java

   1 /*
   2  * Copyright (c) 2015 Cisco 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
   9 package org.opendaylight.controller.netconf.mdsal.connector;
  10
  11 import com.google.common.base.Preconditions;
  12 import java.util.concurrent.atomic.AtomicReference;
  13 import org.opendaylight.controller.sal.core.api.model.SchemaService;
  14 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  15 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  16 import org.opendaylight.yangtools.yang.model.api.SchemaContextListener;
  17
  18 public class CurrentSchemaContext implements SchemaContextListener, AutoCloseable {
  19     final AtomicReference<SchemaContext> currentContext = new AtomicReference<SchemaContext>();
  20     private final ListenerRegistration<SchemaContextListener> schemaContextListenerListenerRegistration;
  21
  22     public SchemaContext getCurrentContext() {
  23         Preconditions.checkState(currentContext.get() != null, "Current context not received");
  24         return currentContext.get();
  25     }
  26
  27     public CurrentSchemaContext(final SchemaService schemaService) {
  28         schemaContextListenerListenerRegistration = schemaService.registerSchemaContextListener(this);
  29     }
  30
  31     @Override
  32     public void onGlobalContextUpdated(final SchemaContext schemaContext) {
  33         currentContext.set(schemaContext);
  34     }
  35
  36     @Override
  37     public void close() throws Exception {
  38         schemaContextListenerListenerRegistration.close();
  39         currentContext.set(null);
  40     }
  41 }