BUG 2138: Introduce DistributedShardedDOMDataTree

[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / main / java / org / opendaylight / controller / cluster / sharding / ShardFrontend.java

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/sharding/ShardFrontend.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/sharding/ShardFrontend.java
new file mode 100644 (file)
index 0000000..d39ccec
--- /dev/null
+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/sharding/ShardFrontend.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2016 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.cluster.sharding;
+
+import com.google.common.base.Preconditions;
+import java.util.Collection;
+import javax.annotation.Nonnull;
+import org.opendaylight.controller.cluster.databroker.actors.dds.DataStoreClient;
+import org.opendaylight.mdsal.dom.api.DOMDataTreeChangeListener;
+import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
+import org.opendaylight.mdsal.dom.api.DOMDataTreeShard;
+import org.opendaylight.mdsal.dom.spi.shard.DOMDataTreeShardProducer;
+import org.opendaylight.mdsal.dom.spi.shard.ReadableWriteableDOMDataTreeShard;
+import org.opendaylight.yangtools.concepts.ListenerRegistration;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+
+/**
+ * Proxy implementation of a shard that creates forwarding producers to the backend shard.
+ */
+class ShardFrontend implements ReadableWriteableDOMDataTreeShard {
+
+    private final DataStoreClient client;
+    private final DOMDataTreeIdentifier shardRoot;
+
+    ShardFrontend(final DataStoreClient client,
+                  final DOMDataTreeIdentifier shardRoot) {
+        this.client = Preconditions.checkNotNull(client);
+        this.shardRoot = Preconditions.checkNotNull(shardRoot);
+    }
+
+    @Override
+    public DOMDataTreeShardProducer createProducer(final Collection<DOMDataTreeIdentifier> paths) {
+        return new ShardProxyProducer(shardRoot, paths, client);
+    }
+
+    @Override
+    public void onChildAttached(final DOMDataTreeIdentifier prefix, final DOMDataTreeShard child) {
+        // TODO message directly into the shard
+    }
+
+    @Override
+    public void onChildDetached(final DOMDataTreeIdentifier prefix, final DOMDataTreeShard child) {
+        // TODO message directly into the shard
+    }
+
+    @Nonnull
+    @Override
+    public <L extends DOMDataTreeChangeListener> ListenerRegistration<L> registerTreeChangeListener(
+            final YangInstanceIdentifier treeId, final L listener) {
+        throw new UnsupportedOperationException("Registering data tree change listener is not supported");
+    }
+}