package org.opendaylight.controller.md.sal.dom.store.impl;
import static com.google.common.base.Preconditions.checkNotNull;
-import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeSnapshot;
+import com.google.common.base.Optional;
+import com.google.common.base.Preconditions;
+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.AbstractDOMStoreTransaction;
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;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeSnapshot;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
-import com.google.common.base.Optional;
-import com.google.common.base.Preconditions;
-import com.google.common.util.concurrent.CheckedFuture;
-import com.google.common.util.concurrent.Futures;
-
/**
*
* Implementation of read-only transaction backed by {@link DataTreeSnapshot}
* which delegates most of its calls to similar methods provided by underlying snapshot.
*
*/
-final class SnapshotBackedReadTransaction extends AbstractDOMStoreTransaction
+final class SnapshotBackedReadTransaction extends AbstractDOMStoreTransaction<Object>
implements DOMStoreReadTransaction {
private static final Logger LOG = LoggerFactory.getLogger(SnapshotBackedReadTransaction.class);
- private DataTreeSnapshot stableSnapshot;
+ private volatile DataTreeSnapshot stableSnapshot;
- public SnapshotBackedReadTransaction(final Object identifier, final DataTreeSnapshot snapshot) {
- super(identifier);
+ public SnapshotBackedReadTransaction(final Object identifier, final boolean debug, final DataTreeSnapshot snapshot) {
+ super(identifier, debug);
this.stableSnapshot = Preconditions.checkNotNull(snapshot);
LOG.debug("ReadOnly Tx: {} allocated with snapshot {}", identifier, snapshot);
}
LOG.debug("Tx: {} Read: {}", getIdentifier(), path);
checkNotNull(path, "Path must not be null.");
- if(stableSnapshot == null) {
+ final DataTreeSnapshot snapshot = stableSnapshot;
+ if (snapshot == null) {
return Futures.immediateFailedCheckedFuture(new ReadFailedException("Transaction is closed"));
}
try {
- return Futures.immediateCheckedFuture(stableSnapshot.readNode(path));
+ return Futures.immediateCheckedFuture(snapshot.readNode(path));
} catch (Exception e) {
LOG.error("Tx: {} Failed Read of {}", getIdentifier(), path, e);
return Futures.immediateFailedCheckedFuture(new ReadFailedException("Read failed",e));
}
}
-}
\ No newline at end of file
+
+ @Override
+ public CheckedFuture<Boolean, ReadFailedException> exists(final YangInstanceIdentifier path) {
+ LOG.debug("Tx: {} Exists: {}", getIdentifier(), path);
+ checkNotNull(path, "Path must not be null.");
+
+ try {
+ return Futures.immediateCheckedFuture(
+ read(path).checkedGet().isPresent());
+ } catch (ReadFailedException e) {
+ return Futures.immediateFailedCheckedFuture(e);
+ }
+ }
+}