BUG-2673: make IMDS implement DOMStoreTreeChangePublisher

[mdsal.git] / opendaylight / md-sal / sal-inmemory-datastore / src / main / java / org / opendaylight / controller / md / sal / dom / store / impl / InMemoryDOMStoreTreeChangePublisher.java

diff --git a/opendaylight/md-sal/sal-inmemory-datastore/src/main/java/org/opendaylight/controller/md/sal/dom/store/impl/InMemoryDOMStoreTreeChangePublisher.java b/opendaylight/md-sal/sal-inmemory-datastore/src/main/java/org/opendaylight/controller/md/sal/dom/store/impl/InMemoryDOMStoreTreeChangePublisher.java
new file mode 100644 (file)
index 0000000..999fb91
--- /dev/null
+++ b/opendaylight/md-sal/sal-inmemory-datastore/src/main/java/org/opendaylight/controller/md/sal/dom/store/impl/InMemoryDOMStoreTreeChangePublisher.java
@@ -0,0 +1,65 @@
+/*
+ * 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.md.sal.dom.store.impl;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.concurrent.ExecutorService;
+import javax.annotation.Nonnull;
+import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
+import org.opendaylight.controller.md.sal.dom.spi.AbstractDOMDataTreeChangeListenerRegistration;
+import org.opendaylight.controller.sal.core.spi.data.AbstractDOMStoreTreeChangePublisher;
+import org.opendaylight.yangtools.util.concurrent.QueuedNotificationManager;
+import org.opendaylight.yangtools.util.concurrent.QueuedNotificationManager.Invoker;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+final class InMemoryDOMStoreTreeChangePublisher extends AbstractDOMStoreTreeChangePublisher {
+    private static final Invoker<AbstractDOMDataTreeChangeListenerRegistration<?>, DataTreeCandidate> MANAGER_INVOKER =
+            new Invoker<AbstractDOMDataTreeChangeListenerRegistration<?>, DataTreeCandidate>() {
+                @Override
+                public void invokeListener(final AbstractDOMDataTreeChangeListenerRegistration<?> listener, final DataTreeCandidate notification) {
+                    // FIXME: this is inefficient, as we could grab the entire queue for the listener and post it
+                    final DOMDataTreeChangeListener inst = listener.getInstance();
+                    if (inst != null) {
+                        inst.onDataTreeChanged(Collections.singletonList(notification));
+                    }
+                }
+            };
+    private static final Logger LOG = LoggerFactory.getLogger(InMemoryDOMStoreTreeChangePublisher.class);
+    private final QueuedNotificationManager<AbstractDOMDataTreeChangeListenerRegistration<?>, DataTreeCandidate> notificationManager;
+
+    InMemoryDOMStoreTreeChangePublisher(final ExecutorService listenerExecutor, final int maxQueueSize) {
+        notificationManager = new QueuedNotificationManager<>(listenerExecutor, MANAGER_INVOKER, maxQueueSize, "DataTreeChangeListenerQueueMgr");
+    }
+
+    @Override
+    protected void notifyListeners(final Collection<AbstractDOMDataTreeChangeListenerRegistration<?>> registrations, final YangInstanceIdentifier path, final DataTreeCandidateNode node) {
+        final DataTreeCandidate candidate = new SimpleDataTreeCandidate(path, node);
+
+        for (AbstractDOMDataTreeChangeListenerRegistration<?> reg : registrations) {
+            LOG.debug("Enqueueing candidate {} to registration {}", candidate, registrations);
+            notificationManager.submitNotification(reg, candidate);
+        }
+    }
+
+    @Override
+    protected synchronized void registrationRemoved(final AbstractDOMDataTreeChangeListenerRegistration<?> registration) {
+        LOG.debug("Closing registration {}", registration);
+
+        // FIXME: remove the queue for this registration and make sure we clear it
+    }
+
+    synchronized void publishChange(@Nonnull final DataTreeCandidate candidate) {
+        // Runs synchronized with registrationRemoved()
+        processCandidateTree(candidate);
+    }
+}