X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?p=controller.git;a=blobdiff_plain;f=opendaylight%2Fmd-sal%2Fsal-dom-api%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fmd%2Fsal%2Fdom%2Fapi%2FDOMRpcAvailabilityListener.java;h=93db2a0962f283c2ca1669b94d1a1756fbcc945c;hp=35c58feb163e1e90d60caa6ab64b48b2cd52d687;hb=aaea3e9a92ae9d6fac04c4a065db4b35cbca9ed0;hpb=dc76c5f86830b541fe9c4f2a011e199486558779

diff --git a/opendaylight/md-sal/sal-dom-api/src/main/java/org/opendaylight/controller/md/sal/dom/api/DOMRpcAvailabilityListener.java b/opendaylight/md-sal/sal-dom-api/src/main/java/org/opendaylight/controller/md/sal/dom/api/DOMRpcAvailabilityListener.java
index 35c58feb16..93db2a0962 100644
--- a/opendaylight/md-sal/sal-dom-api/src/main/java/org/opendaylight/controller/md/sal/dom/api/DOMRpcAvailabilityListener.java
+++ b/opendaylight/md-sal/sal-dom-api/src/main/java/org/opendaylight/controller/md/sal/dom/api/DOMRpcAvailabilityListener.java
@@ -9,26 +9,62 @@ package org.opendaylight.controller.md.sal.dom.api;
 
 import java.util.Collection;
 import java.util.EventListener;
-import javax.annotation.Nonnull;
+import org.eclipse.jdt.annotation.NonNull;
 
 /**
- * An {@link EventListener} used to track RPC implementations becoming (un)available
- * to a {@link DOMRpcService}.
+ * An {@link EventListener} used to track RPC implementations becoming (un)available a {@link DOMRpcService}. Note that
+ * the reported {@link DOMRpcIdentifier}s form an identifier space shared between RFC7950 actions and RFC6020 RPCs,
+ * the former being also known as 'Routed RPCs'.
+ *
+ * <p>
+ * Interpretation of DOMRpcIdentifiers has to be evaluated in the context of one of these types, which need to be
+ * determined by matching {@link DOMRpcIdentifier#getType()} against a
+ * {@link org.opendaylight.yangtools.yang.model.api.SchemaContext}, which determines actual semantics of
+ * {@link DOMRpcIdentifier#getContextReference()}. Corresponding SchemaNode is required to be a known sub-interface
+ * of {@link org.opendaylight.yangtools.yang.model.api.OperationDefinition}.
+ *
+ * <p>
+ * For RFC6020 RPCs, reported context reference is always non-null and empty. It indicates an RPC implementation has
+ * been registered and invocations can be reasonably (with obvious distributed system caveats coming from asynchronous
+ * events) expected to succeed.
+ *
+ * <p>
+ * For RFC7950 actions with a non-empty context-reference, the indication is the same as for RFC6020 RPCs.
+ *
+ * <p>
+ * For RFC7950 actions with an empty context-reference, the indication is that the corresponding actions are
+ * potentially available, but are subject to dynamic lifecycle of their context references. This includes two primary
+ * use cases:
+ * <ul>
+ *     <li>dynamic action instantiation (when a device connects)</li>
+ *     <li>dynamic action translation, such as transforming one action into another</li>
+ * </ul>
+ * First use case will provide further availability events with non-empty context references as they become available,
+ * which can be safely ignored if the listener is interested in pure invocation-type integration.
+ *
+ * <p>
+ * Second use case will not be providing further events, but rather will attempt to map any incoming invocation onto
+ * some other RPC or action, or similar, which can separately fail. If a sub-request fails, such implementations are
+ * required do report {@link DOMRpcImplementationNotAvailableException} as the invocation result, with the underlying
+ * failure being linked as a cause.
+ *
+ * @deprecated Use {@link org.opendaylight.mdsal.dom.api.DOMRpcAvailabilityListener} instead.
  */
+@Deprecated(forRemoval = true)
 public interface DOMRpcAvailabilityListener extends EventListener {
     /**
      * Method invoked whenever an RPC type becomes available.
      *
      * @param rpcs RPC types newly available
      */
-    void onRpcAvailable(@Nonnull Collection<DOMRpcIdentifier> rpcs);
+    void onRpcAvailable(@NonNull Collection<DOMRpcIdentifier> rpcs);
 
     /**
      * Method invoked whenever an RPC type becomes unavailable.
      *
      * @param rpcs RPC types which became unavailable
      */
-    void onRpcUnavailable(@Nonnull Collection<DOMRpcIdentifier> rpcs);
+    void onRpcUnavailable(@NonNull Collection<DOMRpcIdentifier> rpcs);
 
     /**
      * Implementation filtering method. This method is useful for forwarding RPC implementations,