Revert "Remove support for actions/rpc/notifications"

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

diff --git a/opendaylight/blueprint/src/main/java/org/opendaylight/controller/blueprint/ext/StaticReferenceMetadata.java b/opendaylight/blueprint/src/main/java/org/opendaylight/controller/blueprint/ext/StaticReferenceMetadata.java
new file mode 100644 (file)
index 0000000..97c04af
--- /dev/null
+++ b/opendaylight/blueprint/src/main/java/org/opendaylight/controller/blueprint/ext/StaticReferenceMetadata.java
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2016 Brocade Communications 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 org.osgi.service.blueprint.container.ComponentDefinitionException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Factory metadata corresponding to the "static-reference" element that obtains an OSGi service and
+ * returns the actual instance. This differs from the standard "reference" element that returns a dynamic
+ * proxy whose underlying service instance can come and go.
+ *
+ * @author Thomas Pantelis
+ */
+class StaticReferenceMetadata extends AbstractDependentComponentFactoryMetadata {
+    private static final Logger LOG = LoggerFactory.getLogger(StaticReferenceMetadata.class);
+
+    private final String interfaceName;
+    private volatile Object retrievedService;
+
+    StaticReferenceMetadata(final String id, final String interfaceName) {
+        super(id);
+        this.interfaceName = interfaceName;
+    }
+
+    @Override
+    protected void startTracking() {
+        retrieveService(interfaceName, interfaceName, service -> {
+            retrievedService = service;
+            setSatisfied();
+        });
+    }
+
+    @Override
+    public Object create() throws ComponentDefinitionException {
+        super.onCreate();
+
+        LOG.debug("{}: create returning service {}", logName(), retrievedService);
+
+        return retrievedService;
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder builder = new StringBuilder();
+        builder.append("StaticReferenceMetadata [interfaceName=").append(interfaceName).append("]");
+        return builder.toString();
+    }
+}