opendaylight/blueprint/src/main/java/org/opendaylight/controller/blueprint/ext/RpcServiceMetadata.java

   1 /*
   2  * Copyright (c) 2016 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.blueprint.ext;
   9
  10 import java.util.Collection;
  11 import java.util.HashSet;
  12 import java.util.Set;
  13 import org.apache.aries.blueprint.services.ExtendedBlueprintContainer;
  14 import org.opendaylight.controller.md.sal.dom.api.DOMRpcAvailabilityListener;
  15 import org.opendaylight.controller.md.sal.dom.api.DOMRpcIdentifier;
  16 import org.opendaylight.controller.md.sal.dom.api.DOMRpcService;
  17 import org.opendaylight.controller.sal.binding.api.RpcProviderRegistry;
  18 import org.opendaylight.controller.sal.core.api.model.SchemaService;
  19 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  20 import org.opendaylight.yangtools.yang.binding.RpcService;
  21 import org.opendaylight.yangtools.yang.binding.util.BindingReflections;
  22 import org.opendaylight.yangtools.yang.common.QNameModule;
  23 import org.opendaylight.yangtools.yang.model.api.Module;
  24 import org.opendaylight.yangtools.yang.model.api.RpcDefinition;
  25 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  26 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  27 import org.osgi.service.blueprint.container.ComponentDefinitionException;
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30
  31 /**
  32  * Factory metadata corresponding to the "rpc-service" element that gets an RPC service implementation from
  33  * the RpcProviderRegistry and provides it to the Blueprint container.
  34  *
  35  * @author Thomas Pantelis
  36  */
  37 class RpcServiceMetadata extends AbstractDependentComponentFactoryMetadata {
  38     private static final Logger LOG = LoggerFactory.getLogger(RpcServiceMetadata.class);
  39
  40     private final String interfaceName;
  41     private volatile Set<SchemaPath> rpcSchemaPaths;
  42     private volatile RpcProviderRegistry rpcRegistry;
  43     private volatile ListenerRegistration<DOMRpcAvailabilityListener> rpcListenerReg;
  44     private volatile Class<RpcService> rpcInterface;
  45
  46     RpcServiceMetadata(String id, String interfaceName) {
  47         super(id);
  48         this.interfaceName = interfaceName;
  49     }
  50
  51     @Override
  52     @SuppressWarnings("unchecked")
  53     public void init(ExtendedBlueprintContainer container) {
  54         super.init(container);
  55
  56         try {
  57             Class<?> interfaceClass = container().getBundleContext().getBundle().loadClass(interfaceName);
  58             if(!RpcService.class.isAssignableFrom(interfaceClass)) {
  59                 throw new ComponentDefinitionException(String.format(
  60                         "%s: The specified interface %s is not an RpcService", logName(), interfaceName));
  61             }
  62
  63             rpcInterface = (Class<RpcService>)interfaceClass;
  64         } catch(Exception e) {
  65             throw new ComponentDefinitionException(String.format("%s: Error obtaining interface class %s",
  66                     logName(), interfaceName), e);
  67         }
  68     }
  69
  70     @Override
  71     protected void startTracking() {
  72         // First get the SchemaContext. This will be used to get the RPC SchemaPaths.
  73
  74         retrieveService("SchemaService", SchemaService.class,
  75                 service -> retrievedSchemaContext(((SchemaService)service).getGlobalContext()));
  76     }
  77
  78     private void retrievedSchemaContext(SchemaContext schemaContext) {
  79         LOG.debug("{}: retrievedSchemaContext", logName());
  80
  81         QNameModule moduleName = BindingReflections.getQNameModule(rpcInterface);
  82         Module module = schemaContext.findModuleByNamespaceAndRevision(moduleName.getNamespace(), moduleName.getRevision());
  83
  84         LOG.debug("{}: Got Module: {}", logName(), module);
  85
  86         rpcSchemaPaths = new HashSet<>();
  87         for(RpcDefinition rpcDef : module.getRpcs()) {
  88             rpcSchemaPaths.add(rpcDef.getPath());
  89         }
  90
  91         LOG.debug("{}: Got SchemaPaths: {}", logName(), rpcSchemaPaths);
  92
  93         // First get the DOMRpcService OSGi service. This will be used to register a listener to be notified
  94         // when the underlying DOM RPC service is available.
  95
  96         retrieveService("DOMRpcService", DOMRpcService.class, service -> retrievedDOMRpcService((DOMRpcService)service));
  97     }
  98
  99     private void retrievedDOMRpcService(DOMRpcService domRpcService) {
 100         LOG.debug("{}: retrievedDOMRpcService", logName());
 101
 102         rpcListenerReg = domRpcService.registerRpcListener(new DOMRpcAvailabilityListener() {
 103             @Override
 104             public void onRpcAvailable(Collection<DOMRpcIdentifier> rpcs) {
 105                 onRpcsAvailable(rpcs);
 106             }
 107
 108             @Override
 109             public void onRpcUnavailable(Collection<DOMRpcIdentifier> rpcs) {
 110             }
 111         });
 112     }
 113
 114     protected void onRpcsAvailable(Collection<DOMRpcIdentifier> rpcs) {
 115         for(DOMRpcIdentifier identifier: rpcs) {
 116             if(rpcSchemaPaths.contains(identifier.getType())) {
 117                 LOG.debug("{}: onRpcsAvailable - found SchemaPath {}", logName(), identifier.getType());
 118
 119                 retrieveService("RpcProviderRegistry", RpcProviderRegistry.class, service -> {
 120                     rpcRegistry = (RpcProviderRegistry)service;
 121                     setSatisfied();
 122                 });
 123
 124                 break;
 125             }
 126         }
 127     }
 128
 129     @Override
 130     public Object create() throws ComponentDefinitionException {
 131         LOG.debug("{}: In create: interfaceName: {}", logName(), interfaceName);
 132
 133         try {
 134             RpcService rpcService = rpcRegistry.getRpcService(rpcInterface);
 135
 136             LOG.debug("{}: create returning service {}", logName(), rpcService);
 137
 138             return rpcService;
 139         } catch(Exception e) {
 140             throw new ComponentDefinitionException("Error getting RPC service for " + interfaceName, e);
 141         }
 142     }
 143
 144     @Override
 145     public void stopTracking() {
 146         super.stopTracking();
 147         closeRpcListenerReg();
 148     }
 149
 150     private void closeRpcListenerReg() {
 151         if(rpcListenerReg != null) {
 152             rpcListenerReg.close();
 153             rpcListenerReg = null;
 154         }
 155     }
 156
 157     @Override
 158     public void destroy(Object instance) {
 159         super.destroy(instance);
 160         closeRpcListenerReg();
 161     }
 162
 163     @Override
 164     public String toString() {
 165         return "RpcServiceMetadata [id=" + getId() + ", interfaceName=" + interfaceName + "]";
 166     }
 167 }