Publish SnapshotBacked transactions

[controller.git] / opendaylight / md-sal / sal-dom-spi / src / main / java / org / opendaylight / controller / sal / core / spi / data / SnapshotBackedReadWriteTransaction.java

diff --git a/opendaylight/md-sal/sal-dom-spi/src/main/java/org/opendaylight/controller/sal/core/spi/data/SnapshotBackedReadWriteTransaction.java b/opendaylight/md-sal/sal-dom-spi/src/main/java/org/opendaylight/controller/sal/core/spi/data/SnapshotBackedReadWriteTransaction.java
new file mode 100644 (file)
index 0000000..30abf87
--- /dev/null
+++ b/opendaylight/md-sal/sal-dom-spi/src/main/java/org/opendaylight/controller/sal/core/spi/data/SnapshotBackedReadWriteTransaction.java
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2014 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.sal.core.spi.data;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import com.google.common.annotations.Beta;
+import com.google.common.base.Optional;
+import com.google.common.util.concurrent.CheckedFuture;
+import com.google.common.util.concurrent.Futures;
+import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
+import org.opendaylight.controller.sal.core.spi.data.SnapshotBackedWriteTransaction.TransactionReadyPrototype;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeSnapshot;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Implementation of Read-Write transaction which is backed by {@link DataTreeSnapshot}
+ * and executed according to {@link TransactionReadyPrototype}.
+ *
+ * @param <T> identifier type
+ */
+@Beta
+public final class SnapshotBackedReadWriteTransaction<T> extends SnapshotBackedWriteTransaction<T> implements DOMStoreReadWriteTransaction {
+    private static final Logger LOG = LoggerFactory.getLogger(SnapshotBackedReadWriteTransaction.class);
+
+    SnapshotBackedReadWriteTransaction(final T identifier, final boolean debug,
+            final DataTreeSnapshot snapshot, final TransactionReadyPrototype<T> readyImpl) {
+        super(identifier, debug, snapshot, readyImpl);
+    }
+
+    @Override
+    public CheckedFuture<Optional<NormalizedNode<?,?>>, ReadFailedException> read(final YangInstanceIdentifier path) {
+        LOG.debug("Tx: {} Read: {}", getIdentifier(), path);
+        checkNotNull(path, "Path must not be null.");
+
+        final Optional<NormalizedNode<?, ?>> result;
+        try {
+            result = readSnapshotNode(path);
+        } catch (Exception e) {
+            LOG.error("Tx: {} Failed Read of {}", getIdentifier(), path, e);
+            return Futures.immediateFailedCheckedFuture(new ReadFailedException("Read failed", e));
+        }
+
+        if (result == null) {
+            return Futures.immediateFailedCheckedFuture(new ReadFailedException("Transaction is closed"));
+        } else {
+            return Futures.immediateCheckedFuture(result);
+        }
+    }
+
+    @Override
+    public CheckedFuture<Boolean, ReadFailedException> exists(final YangInstanceIdentifier path) {
+        try {
+            return Futures.immediateCheckedFuture(
+                read(path).checkedGet().isPresent());
+        } catch (ReadFailedException e) {
+            return Futures.immediateFailedCheckedFuture(e);
+        }
+    }
+}