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     @SuppressWarnings({ "checkstyle:IllegalCatch", "unchecked" })
  52     @Override
  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 (ComponentDefinitionException e) {
  65             throw e;
  66         } catch (Exception e) {
  67             throw new ComponentDefinitionException(String.format("%s: Error obtaining interface class %s",
  68                     logName(), interfaceName), e);
  69         }
  70     }
  71
  72     @Override
  73     protected void startTracking() {
  74         // First get the SchemaContext. This will be used to get the RPC SchemaPaths.
  75
  76         retrieveService("SchemaService", SchemaService.class,
  77             service -> retrievedSchemaContext(((SchemaService)service).getGlobalContext()));
  78     }
  79
  80     private void retrievedSchemaContext(SchemaContext schemaContext) {
  81         LOG.debug("{}: retrievedSchemaContext", logName());
  82
  83         QNameModule moduleName = BindingReflections.getQNameModule(rpcInterface);
  84         Module module = schemaContext.findModuleByNamespaceAndRevision(moduleName.getNamespace(),
  85                 moduleName.getRevision());
  86
  87         LOG.debug("{}: Got Module: {}", logName(), module);
  88
  89         rpcSchemaPaths = new HashSet<>();
  90         for (RpcDefinition rpcDef : module.getRpcs()) {
  91             rpcSchemaPaths.add(rpcDef.getPath());
  92         }
  93
  94         LOG.debug("{}: Got SchemaPaths: {}", logName(), rpcSchemaPaths);
  95
  96         // First get the DOMRpcService OSGi service. This will be used to register a listener to be notified
  97         // when the underlying DOM RPC service is available.
  98
  99         retrieveService("DOMRpcService", DOMRpcService.class,
 100             service -> retrievedDOMRpcService((DOMRpcService)service));
 101     }
 102
 103     private void retrievedDOMRpcService(DOMRpcService domRpcService) {
 104         LOG.debug("{}: retrievedDOMRpcService", logName());
 105
 106         rpcListenerReg = domRpcService.registerRpcListener(new DOMRpcAvailabilityListener() {
 107             @Override
 108             public void onRpcAvailable(Collection<DOMRpcIdentifier> rpcs) {
 109                 onRpcsAvailable(rpcs);
 110             }
 111
 112             @Override
 113             public void onRpcUnavailable(Collection<DOMRpcIdentifier> rpcs) {
 114             }
 115         });
 116     }
 117
 118     protected void onRpcsAvailable(Collection<DOMRpcIdentifier> rpcs) {
 119         for (DOMRpcIdentifier identifier : rpcs) {
 120             if (rpcSchemaPaths.contains(identifier.getType())) {
 121                 LOG.debug("{}: onRpcsAvailable - found SchemaPath {}", logName(), identifier.getType());
 122
 123                 retrieveService("RpcProviderRegistry", RpcProviderRegistry.class, service -> {
 124                     rpcRegistry = (RpcProviderRegistry)service;
 125                     setSatisfied();
 126                 });
 127
 128                 break;
 129             }
 130         }
 131     }
 132
 133     @SuppressWarnings("checkstyle:IllegalCatch")
 134     @Override
 135     public Object create() throws ComponentDefinitionException {
 136         LOG.debug("{}: In create: interfaceName: {}", logName(), interfaceName);
 137
 138         super.onCreate();
 139
 140         try {
 141             RpcService rpcService = rpcRegistry.getRpcService(rpcInterface);
 142
 143             LOG.debug("{}: create returning service {}", logName(), rpcService);
 144
 145             return rpcService;
 146         } catch (RuntimeException e) {
 147             throw new ComponentDefinitionException("Error getting RPC service for " + interfaceName, e);
 148         }
 149     }
 150
 151     @Override
 152     public void stopTracking() {
 153         super.stopTracking();
 154         closeRpcListenerReg();
 155     }
 156
 157     private void closeRpcListenerReg() {
 158         if (rpcListenerReg != null) {
 159             rpcListenerReg.close();
 160             rpcListenerReg = null;
 161         }
 162     }
 163
 164     @Override
 165     public void destroy(Object instance) {
 166         super.destroy(instance);
 167         closeRpcListenerReg();
 168     }
 169
 170     @Override
 171     public String toString() {
 172         return "RpcServiceMetadata [id=" + getId() + ", interfaceName=" + interfaceName + "]";
 173     }
 174 }