CDS: Implement front-end support for local transactions

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

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/LocalTransactionFactoryImpl.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/LocalTransactionFactoryImpl.java
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+/*
+ * 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;
+
+import akka.actor.ActorSelection;
+import com.google.common.base.Preconditions;
+import org.opendaylight.controller.cluster.datastore.identifiers.TransactionIdentifier;
+import org.opendaylight.controller.cluster.datastore.utils.ActorContext;
+import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadWriteTransaction;
+import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort;
+import org.opendaylight.controller.sal.core.spi.data.SnapshotBackedTransactions;
+import org.opendaylight.controller.sal.core.spi.data.SnapshotBackedWriteTransaction;
+import org.opendaylight.controller.sal.core.spi.data.SnapshotBackedWriteTransaction.TransactionReadyPrototype;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTree;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * {@link LocalTransactionFactory} for instantiating backing transactions which are
+ * disconnected from each other, ie not chained. These are used by {@link AbstractTransactionContextFactory}
+ * to instantiate transactions on shards which are co-located with the shard leader.
+ */
+final class LocalTransactionFactoryImpl extends TransactionReadyPrototype<TransactionIdentifier>
+        implements LocalTransactionFactory {
+
+    private static final Logger LOG = LoggerFactory.getLogger(LocalTransactionFactoryImpl.class);
+    private final ActorSelection leader;
+    private final DataTree dataTree;
+    private final ActorContext actorContext;
+
+    LocalTransactionFactoryImpl(final ActorContext actorContext, final ActorSelection leader, final DataTree dataTree) {
+        this.leader = Preconditions.checkNotNull(leader);
+        this.dataTree = Preconditions.checkNotNull(dataTree);
+        this.actorContext = actorContext;
+    }
+
+    DataTree getDataTree() {
+        return dataTree;
+    }
+
+    @Override
+    public DOMStoreReadWriteTransaction newReadWriteTransaction(TransactionIdentifier identifier) {
+        return SnapshotBackedTransactions.newReadWriteTransaction(identifier, false, dataTree.takeSnapshot(), this);
+    }
+
+    @Override
+    protected void transactionAborted(final SnapshotBackedWriteTransaction<TransactionIdentifier> tx) {
+        // No-op
+    }
+
+    @Override
+    protected DOMStoreThreePhaseCommitCohort transactionReady(final SnapshotBackedWriteTransaction<TransactionIdentifier> tx,
+            final DataTreeModification tree) {
+        return new LocalThreePhaseCommitCohort(actorContext, leader, tx, tree) {
+            @Override
+            protected void transactionAborted(final SnapshotBackedWriteTransaction<TransactionIdentifier> transaction) {
+                // No-op
+                LOG.debug("Transaction {} aborted", transaction);
+            }
+
+            @Override
+            protected void transactionCommitted(final SnapshotBackedWriteTransaction<TransactionIdentifier> transaction) {
+                // No-op
+                LOG.debug("Transaction {} committed", transaction);
+            }
+        };
+    }
+}