2 * Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
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
8 package org.opendaylight.mdsal.binding.api;
10 import org.eclipse.jdt.annotation.NonNull;
11 import org.opendaylight.yangtools.yang.binding.Rpc;
14 * Provides access to registered Remote Procedure Call (RPC) service implementations. The RPCs are defined in YANG
15 * models. {@link RpcProviderService} is this inferface's counterpart allowing registering RPC implementations.
17 public interface RpcService extends BindingService {
19 * Returns an implementation of a requested RPC service.
22 * The returned instance is not an actual implementation of the RPC service interface, but a proxy implementation of
23 * the interface that forwards to an actual implementation, if any.
26 * The following describes the behavior of the proxy when invoking RPC methods:
28 * <li>If an actual implementation is registered with the MD-SAL, all invocations are forwarded to the registered
29 * implementation.</li>
30 * <li>If no actual implementation is registered, all invocations will fail by throwing
31 * {@link IllegalStateException}.</li>
32 * <li>Prior to invoking the actual implementation, the method arguments are are validated. If any are invalid, an
33 * {@link IllegalArgumentException} is thrown.
35 * The returned proxy is automatically updated with the most recent registered implementation.
38 * The generated RPC method APIs require implementors to return a
39 * {@link java.util.concurrent.Future Future} instance that wraps the
40 * {@link org.opendaylight.yangtools.yang.common.RpcResult RpcResult}. Since RPC methods may be
41 * implemented asynchronously, callers should avoid blocking on the
42 * {@link java.util.concurrent.Future Future} result. Instead, it is recommended to use
43 * {@link com.google.common.util.concurrent.JdkFutureAdapters#listenInPoolThread(java.util.concurrent.Future)}
45 * {@link com.google.common.util.concurrent.JdkFutureAdapters#listenInPoolThread(java.util.concurrent.Future,
46 * java.util.concurrent.Executor)} to listen for Rpc Result. This will asynchronously listen for future result
47 * in executor and will not block current thread.
50 * final Future<RpcResult<SomeRpcOutput>> future = someRpc.invoke( ... );
51 * Futures.addCallback(JdkFutureAdapters.listenInThreadPool(future), new FutureCallback<RpcResult<
52 * SomeRpcOutput>>() {
54 * public void onSuccess(RpcResult<SomeRpcOutput> result) {
55 * // process result ...
58 * public void onFailure(Throwable t) {
64 * @param <R> {@link Rpc} type
65 * @param rpcInterface the interface of the RPC. Typically this is an interface generated from a YANG model.
66 * @return the proxy for the requested RPC service. This method never returns null.
68 <R extends Rpc<?, ?>> @NonNull R getRpc(@NonNull Class<R> rpcInterface);