Revert "Remove support for actions/rpc/notifications"

[controller.git] / opendaylight / blueprint / src / main / java / org / opendaylight / controller / blueprint / ext / ActionServiceMetadata.java

diff --git a/opendaylight/blueprint/src/main/java/org/opendaylight/controller/blueprint/ext/ActionServiceMetadata.java b/opendaylight/blueprint/src/main/java/org/opendaylight/controller/blueprint/ext/ActionServiceMetadata.java
new file mode 100644 (file)
index 0000000..7498eab
--- /dev/null
+++ b/opendaylight/blueprint/src/main/java/org/opendaylight/controller/blueprint/ext/ActionServiceMetadata.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2017 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.blueprint.ext;
+
+import java.util.Objects;
+import java.util.function.Predicate;
+import org.opendaylight.mdsal.dom.api.DOMRpcService;
+import org.opendaylight.mdsal.dom.spi.ContentRoutedRpcContext;
+
+/**
+ * Factory metadata corresponding to the "action-service" element. It waits for a DOM promise of registration
+ * to appear in the {@link DOMRpcService} and then acquires a dynamic proxy via RpcProviderRegistry.
+ */
+final class ActionServiceMetadata extends AbstractInvokableServiceMetadata {
+    /*
+     * Implementation note:
+     *
+     * This implementation assumes Binding V1 semantics for actions, which means actions are packaged along with RPCs
+     * into a single interface. This has interesting implications on working with RpcServiceMetadata, which only
+     * handles the RPC side of the contract.
+     *
+     * Further interesting interactions stem from the fact that in DOM world each action is a separate entity, so the
+     * interface contract can let some actions to be invoked, while failing for others. This is a shortcoming of the
+     * Binding Specification and will be addressed in Binding V2 -- where each action is its own interface.
+     */
+    ActionServiceMetadata(final String id, final String interfaceName) {
+        super(id, interfaceName);
+    }
+
+    @Override
+    Predicate<ContentRoutedRpcContext> rpcFilter() {
+        return Objects::nonNull;
+    }
+}