CDS: Implement front-end support for local transactions

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

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/LocalTransactionContext.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/LocalTransactionContext.java
new file mode 100644 (file)
index 0000000..01a778f
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+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/LocalTransactionContext.java
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2015 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.cluster.datastore;
+
+import akka.actor.ActorSelection;
+import com.google.common.base.Optional;
+import com.google.common.util.concurrent.FutureCallback;
+import com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.SettableFuture;
+import org.opendaylight.controller.cluster.datastore.identifiers.TransactionIdentifier;
+import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadWriteTransaction;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
+import scala.concurrent.Future;
+
+/**
+ * Processes front-end transaction operations locally before being committed to the destination shard.
+ * Instances of this class are used when the destination shard is local to the caller.
+ *
+ * @author Thomas Pantelis
+ */
+final class LocalTransactionContext extends AbstractTransactionContext {
+    private final DOMStoreReadWriteTransaction delegate;
+
+    LocalTransactionContext(TransactionIdentifier identifier, DOMStoreReadWriteTransaction delegate) {
+        super(identifier);
+        this.delegate = delegate;
+    }
+
+    @Override
+    public void writeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data) {
+        delegate.write(path, data);
+    }
+
+    @Override
+    public void mergeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data) {
+        delegate.merge(path, data);
+    }
+
+    @Override
+    public void deleteData(YangInstanceIdentifier path) {
+        delegate.delete(path);
+    }
+
+    @Override
+    public void readData(YangInstanceIdentifier path, final SettableFuture<Optional<NormalizedNode<?, ?>>> proxyFuture) {
+        Futures.addCallback(delegate.read(path), new FutureCallback<Optional<NormalizedNode<?, ?>>>() {
+            @Override
+            public void onSuccess(Optional<NormalizedNode<?, ?>> result) {
+                proxyFuture.set(result);
+            }
+
+            @Override
+            public void onFailure(Throwable t) {
+                proxyFuture.setException(t);
+            }
+        });
+    }
+
+    @Override
+    public void dataExists(YangInstanceIdentifier path, final SettableFuture<Boolean> proxyFuture) {
+        Futures.addCallback(delegate.exists(path), new FutureCallback<Boolean>() {
+            @Override
+            public void onSuccess(Boolean result) {
+                proxyFuture.set(result);
+            }
+
+            @Override
+            public void onFailure(Throwable t) {
+                proxyFuture.setException(t);
+            }
+        });
+    }
+
+    private LocalThreePhaseCommitCohort ready() {
+        return (LocalThreePhaseCommitCohort) delegate.ready();
+    }
+
+    @Override
+    public Future<ActorSelection> readyTransaction() {
+        return ready().initiateCoordinatedCommit();
+    }
+
+    @Override
+    public Future<Object> directCommit() {
+        return ready().initiateDirectCommit();
+    }
+
+    @Override
+    public boolean supportsDirectCommit() {
+        return true;
+    }
+
+    @Override
+    public void closeTransaction() {
+        delegate.close();
+    }
+}