CDS: add backend support for local transactions

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

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/messages/ReadyLocalTransactionSerializer.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/messages/ReadyLocalTransactionSerializer.java
new file mode 100644 (file)
index 0000000..237a5c6
--- /dev/null
+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/messages/ReadyLocalTransactionSerializer.java
@@ -0,0 +1,128 @@
+/*
+ * Copyright (c) 2015 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.datastore.messages;
+
+import akka.serialization.JSerializer;
+import com.google.common.base.Optional;
+import com.google.common.base.Preconditions;
+import java.util.ArrayDeque;
+import java.util.Deque;
+import javax.annotation.Nonnull;
+import org.apache.commons.lang3.SerializationUtils;
+import org.opendaylight.controller.cluster.datastore.DataStoreVersions;
+import org.opendaylight.controller.cluster.datastore.modification.DeleteModification;
+import org.opendaylight.controller.cluster.datastore.modification.MergeModification;
+import org.opendaylight.controller.cluster.datastore.modification.WriteModification;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
+import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModificationCursor;
+
+/**
+ * Specialized message transformer, which transforms a {@link ReadyLocalTransaction}
+ * into a {@link BatchedModifications} message. This serializer needs to be plugged
+ * into akka serialization to allow forwarding of ReadyLocalTransaction to remote
+ * shards.
+ */
+public final class ReadyLocalTransactionSerializer extends JSerializer {
+    @Override
+    public int identifier() {
+        return 97439437;
+    }
+
+    @Override
+    public boolean includeManifest() {
+        return false;
+    }
+
+    @Override
+    public byte[] toBinary(final Object obj) {
+        Preconditions.checkArgument(obj instanceof ReadyLocalTransaction, "Unsupported object type %s", obj.getClass());
+        final ReadyLocalTransaction msg = (ReadyLocalTransaction) obj;
+        final BatchedModifications batched = new BatchedModifications(msg.getTransactionID(),
+                DataStoreVersions.CURRENT_VERSION, "");
+        batched.setDoCommitOnReady(msg.isDoCommitOnReady());
+        batched.setReady(true);
+
+        msg.getModification().applyToCursor(new BatchedCursor(batched));
+
+        return SerializationUtils.serialize(batched);
+    }
+
+    @Override
+    public Object fromBinaryJava(final byte[] bytes, final Class<?> clazz) {
+        return SerializationUtils.deserialize(bytes);
+    }
+
+    private static final class BatchedCursor implements DataTreeModificationCursor {
+        private final Deque<YangInstanceIdentifier> stack = new ArrayDeque<>();
+        private final BatchedModifications message;
+
+        BatchedCursor(final BatchedModifications message) {
+            this.message = Preconditions.checkNotNull(message);
+            stack.push(YangInstanceIdentifier.EMPTY);
+        }
+
+        @Override
+        public void delete(final PathArgument child) {
+            message.addModification(new DeleteModification(stack.peek().node(child)));
+        }
+
+        @Override
+        public void merge(final PathArgument child, final NormalizedNode<?, ?> data) {
+            message.addModification(new MergeModification(stack.peek().node(child), data));
+        }
+
+        @Override
+        public void write(final PathArgument child, final NormalizedNode<?, ?> data) {
+            message.addModification(new WriteModification(stack.peek().node(child), data));
+        }
+
+        @Override
+        public void enter(@Nonnull final PathArgument child) {
+            stack.push(stack.peek().node(child));
+        }
+
+        @Override
+        public void enter(@Nonnull final PathArgument... path) {
+            for (PathArgument arg : path) {
+                enter(arg);
+            }
+        }
+
+        @Override
+        public void enter(@Nonnull final Iterable<PathArgument> path) {
+            for (PathArgument arg : path) {
+                enter(arg);
+            }
+        }
+
+        @Override
+        public void exit() {
+            stack.pop();
+        }
+
+        @Override
+        public void exit(final int depth) {
+            Preconditions.checkArgument(depth < stack.size(), "Stack holds only %s elements, cannot exit %s levels", stack.size(), depth);
+            for (int i = 0; i < depth; ++i) {
+                stack.pop();
+            }
+        }
+
+        @Override
+        public Optional<NormalizedNode<?, ?>> readNode(@Nonnull final PathArgument child) {
+            throw new UnsupportedOperationException("Not implemented");
+        }
+
+        @Override
+        public void close() {
+            // No-op
+        }
+    }
+}