infra/rpc/impl/src/main/java/io/fd/honeycomb/rpc/HoneycombDOMRpcService.java

   1 /*
   2  * Copyright (c) 2016 Cisco and/or its affiliates.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package io.fd.honeycomb.rpc;
  18
  19 import static net.javacrumbs.futureconverter.java8guava.FutureConverter.toListenableFuture;
  20
  21 import com.google.common.base.Function;
  22 import com.google.common.util.concurrent.CheckedFuture;
  23 import com.google.common.util.concurrent.Futures;
  24 import com.google.common.util.concurrent.ListenableFuture;
  25 import java.util.concurrent.CompletableFuture;
  26 import javax.annotation.Nonnull;
  27 import javax.annotation.Nullable;
  28 import org.opendaylight.controller.md.sal.dom.api.DOMRpcAvailabilityListener;
  29 import org.opendaylight.controller.md.sal.dom.api.DOMRpcException;
  30 import org.opendaylight.controller.md.sal.dom.api.DOMRpcResult;
  31 import org.opendaylight.controller.md.sal.dom.api.DOMRpcService;
  32 import org.opendaylight.controller.md.sal.dom.spi.DefaultDOMRpcResult;
  33 import org.opendaylight.mdsal.binding.dom.codec.api.BindingNormalizedNodeSerializer;
  34 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  35 import org.opendaylight.yangtools.yang.binding.DataObject;
  36 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  37 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  38 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  39
  40 public final class HoneycombDOMRpcService implements DOMRpcService {
  41
  42     private static final Function<? super Exception, DOMRpcException> ANY_EX_TO_RPC_EXCEPTION_MAPPER =
  43         (Function<Exception, DOMRpcException>) e -> (e instanceof DOMRpcException)
  44             ? (DOMRpcException) e
  45             : new RpcException("RPC failed", e);
  46
  47     private final BindingNormalizedNodeSerializer serializer;
  48     private final RpcRegistry rpcRegistry;
  49
  50     public HoneycombDOMRpcService(@Nonnull final BindingNormalizedNodeSerializer serializer,
  51                                   @Nonnull final RpcRegistry rpcRegistry) {
  52         this.serializer = serializer;
  53         this.rpcRegistry = rpcRegistry;
  54     }
  55
  56     @Nonnull
  57     @Override
  58     public CheckedFuture<DOMRpcResult, DOMRpcException> invokeRpc(@Nonnull final SchemaPath schemaPath,
  59                                                                   @Nullable final NormalizedNode<?, ?> normalizedNode) {
  60         DataObject input = null;
  61         if (normalizedNode != null) {
  62             // RPC input is optional
  63             final SchemaPath nodePatch = schemaPath.createChild(normalizedNode.getNodeType());
  64             input = serializer.fromNormalizedNodeRpcData(nodePatch, (ContainerNode) normalizedNode);
  65         }
  66         final CompletableFuture<DataObject> result = rpcRegistry.invoke(schemaPath, input).toCompletableFuture();
  67         final ListenableFuture<DOMRpcResult> output = getDOMRpcResult(toListenableFuture(result));
  68         return Futures.makeChecked(output, ANY_EX_TO_RPC_EXCEPTION_MAPPER);
  69     }
  70
  71     private ListenableFuture<DOMRpcResult> getDOMRpcResult(final ListenableFuture<DataObject> invoke) {
  72         return Futures.transform(
  73             invoke,
  74             (Function<DataObject, DOMRpcResult>) output -> {
  75                 final ContainerNode outputNode = serializer.toNormalizedNodeRpcData(output);
  76                 return new DefaultDOMRpcResult(outputNode);
  77             });
  78     }
  79
  80     @Nonnull
  81     @Override
  82     public <T extends DOMRpcAvailabilityListener> ListenerRegistration<T> registerRpcListener(@Nonnull final T t) {
  83         return new ListenerRegistration<T>() {
  84             @Override
  85             public void close() {
  86                 // Noop
  87             }
  88
  89             @Override
  90             public T getInstance() {
  91                 return t;
  92             }
  93         };
  94     }
  95 }