BUG-5280: split DistributedDataStore

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

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/databroker/ClientBackedReadTransaction.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/databroker/ClientBackedReadTransaction.java
new file mode 100644 (file)
index 0000000..3d10c39
--- /dev/null
+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/databroker/ClientBackedReadTransaction.java
@@ -0,0 +1,60 @@
+/*
+ * 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.databroker;
+
+import com.google.common.base.Optional;
+import com.google.common.util.concurrent.CheckedFuture;
+import com.google.common.util.concurrent.Futures;
+import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
+import javax.annotation.Nullable;
+import org.opendaylight.controller.cluster.databroker.actors.dds.ClientSnapshot;
+import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
+import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadTransaction;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
+
+/**
+ * An implementation of {@link DOMStoreReadTransaction} backed by a {@link ClientSnapshot}. Used for standalone
+ * transactions.
+ *
+ * @author Robert Varga
+ */
+final class ClientBackedReadTransaction extends ClientBackedTransaction<ClientSnapshot>
+        implements DOMStoreReadTransaction {
+    private static final AtomicReferenceFieldUpdater<ClientBackedReadTransaction, ClientBackedTransactionChain>
+        PARENT_UPDATER = AtomicReferenceFieldUpdater.newUpdater(ClientBackedReadTransaction.class,
+            ClientBackedTransactionChain.class, "parent");
+
+    @SuppressWarnings("unused")
+    private volatile ClientBackedTransactionChain parent;
+
+    ClientBackedReadTransaction(final ClientSnapshot delegate, @Nullable final ClientBackedTransactionChain parent) {
+        super(delegate);
+        this.parent = parent;
+    }
+
+    @Override
+    public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read(final YangInstanceIdentifier path) {
+        return Futures.makeChecked(delegate().read(path), ReadFailedException.MAPPER);
+    }
+
+    @Override
+    public CheckedFuture<Boolean, ReadFailedException> exists(final YangInstanceIdentifier path) {
+        return Futures.makeChecked(delegate().exists(path), ReadFailedException.MAPPER);
+    }
+
+    @Override
+    public void close() {
+        super.close();
+
+        final ClientBackedTransactionChain local = PARENT_UPDATER.getAndSet(this, null);
+        if (local != null) {
+            local.snapshotClosed(delegate());
+        }
+    }
+}