binding/mdsal-binding-dom-adapter/src/main/java/org/opendaylight/mdsal/binding/dom/adapter/RpcServiceAdapter.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.mdsal.binding.dom.adapter;
  10
  11 import com.google.common.base.Function;
  12 import com.google.common.base.Optional;
  13 import com.google.common.base.Preconditions;
  14 import com.google.common.collect.ImmutableMap;
  15 import com.google.common.util.concurrent.Futures;
  16 import com.google.common.util.concurrent.ListenableFuture;
  17 import com.google.common.util.concurrent.MoreExecutors;
  18 import java.lang.reflect.InvocationHandler;
  19 import java.lang.reflect.Method;
  20 import java.lang.reflect.Proxy;
  21 import java.util.Collection;
  22 import java.util.Map.Entry;
  23 import org.opendaylight.mdsal.binding.dom.codec.impl.BindingNormalizedNodeCodecRegistry;
  24 import org.opendaylight.mdsal.dom.api.DOMRpcResult;
  25 import org.opendaylight.mdsal.dom.api.DOMRpcService;
  26 import org.opendaylight.mdsal.dom.spi.RpcRoutingStrategy;
  27 import org.opendaylight.yangtools.yang.binding.DataContainer;
  28 import org.opendaylight.yangtools.yang.binding.DataObject;
  29 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  30 import org.opendaylight.yangtools.yang.binding.RpcService;
  31 import org.opendaylight.yangtools.yang.binding.util.BindingReflections;
  32 import org.opendaylight.yangtools.yang.common.QName;
  33 import org.opendaylight.yangtools.yang.common.RpcError;
  34 import org.opendaylight.yangtools.yang.common.RpcError.ErrorSeverity;
  35 import org.opendaylight.yangtools.yang.common.RpcResult;
  36 import org.opendaylight.yangtools.yang.common.RpcResultBuilder;
  37 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  38 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  39 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  40 import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
  41 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  42 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
  43 import org.opendaylight.yangtools.yang.model.api.RpcDefinition;
  44 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  45
  46 class RpcServiceAdapter implements InvocationHandler {
  47
  48     private final ImmutableMap<Method, RpcInvocationStrategy> rpcNames;
  49     private final Class<? extends RpcService> type;
  50     private final BindingToNormalizedNodeCodec codec;
  51     private final DOMRpcService delegate;
  52     private final RpcService proxy;
  53
  54     RpcServiceAdapter(final Class<? extends RpcService> type, final BindingToNormalizedNodeCodec codec,
  55             final DOMRpcService domService) {
  56         this.type = Preconditions.checkNotNull(type);
  57         this.codec = Preconditions.checkNotNull(codec);
  58         this.delegate = Preconditions.checkNotNull(domService);
  59         final ImmutableMap.Builder<Method, RpcInvocationStrategy> rpcBuilder = ImmutableMap.builder();
  60         for (final Entry<Method, RpcDefinition> rpc : codec.getRpcMethodToSchema(type).entrySet()) {
  61             rpcBuilder.put(rpc.getKey(), createStrategy(rpc.getKey(), rpc.getValue()));
  62         }
  63         rpcNames = rpcBuilder.build();
  64         proxy = (RpcService) Proxy.newProxyInstance(type.getClassLoader(), new Class[] {type}, this);
  65     }
  66
  67     private RpcInvocationStrategy createStrategy(final Method method, final RpcDefinition schema) {
  68         final RpcRoutingStrategy strategy = RpcRoutingStrategy.from(schema);
  69         if (strategy.isContextBasedRouted()) {
  70             return new RoutedStrategy(schema.getPath(), method, strategy.getLeaf());
  71         }
  72         return new NonRoutedStrategy(schema.getPath());
  73     }
  74
  75     RpcService getProxy() {
  76         return proxy;
  77     }
  78
  79     @Override
  80     @SuppressWarnings("checkstyle:hiddenField")
  81     public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {
  82
  83         final RpcInvocationStrategy rpc = rpcNames.get(method);
  84         if (rpc != null) {
  85             if (method.getParameterTypes().length == 0) {
  86                 return rpc.invokeEmpty();
  87             }
  88             if (args.length != 1) {
  89                 throw new IllegalArgumentException("Input must be provided.");
  90             }
  91             return rpc.invoke((DataObject) args[0]);
  92         }
  93
  94         if (isObjectMethod(method)) {
  95             return callObjectMethod(proxy, method, args);
  96         }
  97         throw new UnsupportedOperationException("Method " + method.toString() + "is unsupported.");
  98     }
  99
 100     private static boolean isObjectMethod(final Method method) {
 101         switch (method.getName()) {
 102             case "toString":
 103                 return method.getReturnType().equals(String.class) && method.getParameterTypes().length == 0;
 104             case "hashCode":
 105                 return method.getReturnType().equals(int.class) && method.getParameterTypes().length == 0;
 106             case "equals":
 107                 return method.getReturnType().equals(boolean.class) && method.getParameterTypes().length == 1
 108                         && method.getParameterTypes()[0] == Object.class;
 109             default:
 110                 return false;
 111         }
 112     }
 113
 114     private Object callObjectMethod(final Object self, final Method method, final Object[] args) {
 115         switch (method.getName()) {
 116             case "toString":
 117                 return type.getName() + "$Adapter{delegate=" + delegate.toString() + "}";
 118             case "hashCode":
 119                 return System.identityHashCode(self);
 120             case "equals":
 121                 return self == args[0];
 122             default:
 123                 return null;
 124         }
 125     }
 126
 127     private abstract class RpcInvocationStrategy {
 128
 129         private final SchemaPath rpcName;
 130
 131         protected RpcInvocationStrategy(final SchemaPath path) {
 132             rpcName = path;
 133         }
 134
 135         final ListenableFuture<RpcResult<?>> invoke(final DataObject input) {
 136             return invoke0(rpcName, serialize(input));
 137         }
 138
 139         abstract NormalizedNode<?, ?> serialize(DataObject input);
 140
 141         final ListenableFuture<RpcResult<?>> invokeEmpty() {
 142             return invoke0(rpcName, null);
 143         }
 144
 145         final SchemaPath getRpcName() {
 146             return rpcName;
 147         }
 148
 149         private ListenableFuture<RpcResult<?>> invoke0(final SchemaPath schemaPath, final NormalizedNode<?, ?> input) {
 150             final ListenableFuture<DOMRpcResult> result = delegate.invokeRpc(schemaPath, input);
 151             if (result instanceof LazyDOMRpcResultFuture) {
 152                 return ((LazyDOMRpcResultFuture) result).getBindingFuture();
 153             }
 154
 155             return transformFuture(schemaPath, result, codec.getCodecFactory());
 156         }
 157
 158         private ListenableFuture<RpcResult<?>> transformFuture(final SchemaPath rpc,
 159                 final ListenableFuture<DOMRpcResult> domFuture, final BindingNormalizedNodeCodecRegistry resultCodec) {
 160             return Futures.transform(domFuture, (Function<DOMRpcResult, RpcResult<?>>) input -> {
 161                 final NormalizedNode<?, ?> domData = input.getResult();
 162                 final DataObject bindingResult;
 163                 if (domData != null) {
 164                     final SchemaPath rpcOutput = rpc.createChild(QName.create(rpc.getLastComponent(), "output"));
 165                     bindingResult = resultCodec.fromNormalizedNodeRpcData(rpcOutput, (ContainerNode) domData);
 166                 } else {
 167                     bindingResult = null;
 168                 }
 169
 170                 // DOMRpcResult does not have a notion of success, hence we have to reverse-engineer it by looking
 171                 // at reported errors and checking whether they are just warnings.
 172                 final Collection<RpcError> errors = input.getErrors();
 173                 return RpcResult.class.cast(RpcResultBuilder.status(errors.stream()
 174                     .noneMatch(error -> error.getSeverity() == ErrorSeverity.ERROR))
 175                     .withResult(bindingResult).withRpcErrors(errors).build());
 176             }, MoreExecutors.directExecutor());
 177         }
 178     }
 179
 180     private final class NonRoutedStrategy extends RpcInvocationStrategy {
 181
 182         protected NonRoutedStrategy(final SchemaPath path) {
 183             super(path);
 184         }
 185
 186         @Override
 187         NormalizedNode<?, ?> serialize(final DataObject input) {
 188             return LazySerializedContainerNode.create(getRpcName(), input, codec.getCodecRegistry());
 189         }
 190
 191     }
 192
 193     private final class RoutedStrategy extends RpcInvocationStrategy {
 194
 195         private final ContextReferenceExtractor refExtractor;
 196         private final NodeIdentifier contextName;
 197
 198         protected RoutedStrategy(final SchemaPath path, final Method rpcMethod, final QName leafName) {
 199             super(path);
 200             final Optional<Class<? extends DataContainer>> maybeInputType =
 201                     BindingReflections.resolveRpcInputClass(rpcMethod);
 202             Preconditions.checkState(maybeInputType.isPresent(), "RPC method %s has no input", rpcMethod.getName());
 203             final Class<? extends DataContainer> inputType = maybeInputType.get();
 204             refExtractor = ContextReferenceExtractor.from(inputType);
 205             this.contextName = new NodeIdentifier(leafName);
 206         }
 207
 208         @Override
 209         NormalizedNode<?, ?> serialize(final DataObject input) {
 210             final InstanceIdentifier<?> bindingII = refExtractor.extract(input);
 211             if (bindingII != null) {
 212                 final YangInstanceIdentifier yangII = codec.toYangInstanceIdentifierCached(bindingII);
 213                 final LeafNode<?> contextRef = ImmutableNodes.leafNode(contextName, yangII);
 214                 return LazySerializedContainerNode.withContextRef(getRpcName(), input, contextRef,
 215                         codec.getCodecRegistry());
 216             }
 217             return LazySerializedContainerNode.create(getRpcName(), input, codec.getCodecRegistry());
 218         }
 219
 220     }
 221 }