+/*
+ * Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
package org.opendaylight.controller.sal.binding.api;
import org.opendaylight.yangtools.yang.binding.RpcService;
/**
- * Base interface defining contract for retrieving MD-SAL
- * version of RpcServices
- *
+ * Provides access to registered Remote Procedure Call (RPC) service implementations. The RPCs are
+ * defined in YANG models.
+ * <p>
+ * RPC implementations are registered using the {@link RpcProviderRegistry}.
+ *
*/
-public interface RpcConsumerRegistry {
+public interface RpcConsumerRegistry extends BindingAwareService {
/**
- * Returns a session specific instance (implementation) of requested
- * YANG module implentation / service provided by consumer.
- *
- * @param service
- * Broker service
- * @return Session specific implementation of service
+ * Returns an implementation of a requested RPC service.
+ *
+ * <p>
+ * The returned instance is not an actual implementation of the RPC service
+ * interface, but a proxy implementation of the interface that forwards to
+ * an actual implementation, if any.
+ * <p>
+ *
+ * The following describes the behavior of the proxy when invoking RPC methods:
+ * <ul>
+ * <li>If an actual implementation is registered with the MD-SAL, all invocations are
+ * forwarded to the registered implementation.</li>
+ * <li>If no actual implementation is registered, all invocations will fail by
+ * throwing {@link IllegalStateException}.</li>
+ * <li>Prior to invoking the actual implementation, the method arguments are are validated.
+ * If any are invalid, an {@link IllegalArgumentException} is thrown.
+ * </ul>
+ *
+ * The returned proxy is automatically updated with the most recent
+ * registered implementation.
+ * <p>
+ * The generated RPC method APIs require implementors to return a {@link java.util.concurrent.Future Future}
+ * instance that wraps the {@link org.opendaylight.yangtools.yang.common.RpcResult RpcResult}. Since
+ * RPC methods may be implemented asynchronously, callers should avoid blocking on the
+ * {@link java.util.concurrent.Future Future} result. Instead, it is recommended to use
+ * {@link com.google.common.util.concurrent.JdkFutureAdapters#listenInPoolThread(java.util.concurrent.Future)}
+ * or {@link com.google.common.util.concurrent.JdkFutureAdapters#listenInPoolThread(java.util.concurrent.Future, java.util.concurrent.Executor)}
+ * to listen for Rpc Result. This will asynchronously listen for future result in executor and
+ * will not block current thread.
+ *
+ * <pre>
+ * final Future<RpcResult<SomeRpcOutput>> future = someRpcService.someRpc( ... );
+ * Futures.addCallback(JdkFutureAdapters.listenInThreadPool(future), new FutureCallback<RpcResult<SomeRpcOutput>>() {
+ *
+ * public void onSuccess(RpcResult<SomeRpcOutput> result) {
+ * // process result ...
+ * }
+ *
+ * public void onFailure(Throwable t) {
+ * // RPC failed
+ * }
+ * );
+ * </pre>
+ * @param serviceInterface the interface of the RPC Service. Typically this is an interface generated
+ * from a YANG model.
+ * @return the proxy for the requested RPC service. This method never returns null.
*/
- <T extends RpcService> T getRpcService(Class<T> module);
+ <T extends RpcService> T getRpcService(Class<T> serviceInterface);
}