private final ReadOnlyTransaction delegate;
- protected ForwardingReadOnlyTransaction(ReadOnlyTransaction delegate) {
+ protected ForwardingReadOnlyTransaction(final ReadOnlyTransaction delegate) {
this.delegate = delegate;
}
}
@Override
- public <T extends DataObject> CheckedFuture<Optional<T>, ReadFailedException> read(LogicalDatastoreType store,
- InstanceIdentifier<T> path) {
+ public <T extends DataObject> CheckedFuture<Optional<T>, ReadFailedException> read(final LogicalDatastoreType store,
+ final InstanceIdentifier<T> path) {
return delegate.read(store, path);
}
+ @Override
+ public CheckedFuture<Boolean, ReadFailedException> exists(final LogicalDatastoreType store,
+ final InstanceIdentifier<?> path) {
+ return delegate.exists(store, path);
+ }
+
@Override
public Object getIdentifier() {
return delegate.getIdentifier();
private final ReadWriteTransaction delegate;
- protected ForwardingReadWriteTransaction(ReadWriteTransaction delegate) {
+ protected ForwardingReadWriteTransaction(final ReadWriteTransaction delegate) {
this.delegate = delegate;
}
}
@Override
- public <T extends DataObject> void put(LogicalDatastoreType store, InstanceIdentifier<T> path, T data) {
+ public <T extends DataObject> void put(final LogicalDatastoreType store, final InstanceIdentifier<T> path,
+ final T data) {
delegate.put(store, path, data);
}
@Override
- public <T extends DataObject> void put(LogicalDatastoreType store, InstanceIdentifier<T> path, T data,
- boolean createMissingParents) {
+ public <T extends DataObject> void put(final LogicalDatastoreType store, final InstanceIdentifier<T> path,
+ final T data, final boolean createMissingParents) {
delegate.put(store, path, data, createMissingParents);
}
@Override
- public <T extends DataObject> CheckedFuture<Optional<T>, ReadFailedException> read(LogicalDatastoreType store,
- InstanceIdentifier<T> path) {
+ public <T extends DataObject> CheckedFuture<Optional<T>, ReadFailedException> read(final LogicalDatastoreType store,
+ final InstanceIdentifier<T> path) {
return delegate.read(store, path);
}
+ @Override
+ public CheckedFuture<Boolean, ReadFailedException> exists(final LogicalDatastoreType store,
+ final InstanceIdentifier<?> path) {
+ return delegate.exists(store, path);
+ }
+
@Override
public Object getIdentifier() {
return delegate.getIdentifier();
}
@Override
- public <T extends DataObject> void merge(LogicalDatastoreType store, InstanceIdentifier<T> path, T data) {
+ public <T extends DataObject> void merge(final LogicalDatastoreType store, final InstanceIdentifier<T> path,
+ final T data) {
delegate.merge(store, path, data);
}
@Override
- public <T extends DataObject> void merge(LogicalDatastoreType store, InstanceIdentifier<T> path, T data,
- boolean createMissingParents) {
+ public <T extends DataObject> void merge(final LogicalDatastoreType store, final InstanceIdentifier<T> path,
+ final T data, final boolean createMissingParents) {
delegate.merge(store, path, data, createMissingParents);
}
}
@Override
- public void delete(LogicalDatastoreType store, InstanceIdentifier<?> path) {
+ public void delete(final LogicalDatastoreType store, final InstanceIdentifier<?> path) {
delegate.delete(store, path);
}
}
import com.google.common.base.Optional;
import com.google.common.util.concurrent.CheckedFuture;
+import com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.MoreExecutors;
+import org.opendaylight.controller.md.sal.common.api.MappingCheckedFuture;
import org.opendaylight.controller.md.sal.common.api.data.AsyncReadTransaction;
import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
* {@link ReadFailedException} or an exception derived from ReadFailedException.</li>
* </ul>
*/
- <T extends DataObject> CheckedFuture<Optional<T>,ReadFailedException> read(
+ <T extends DataObject> CheckedFuture<Optional<T>, ReadFailedException> read(
LogicalDatastoreType store, InstanceIdentifier<T> path);
+
+ /**
+ * Checks if data is available in the logical data store located at provided path.
+ *
+ * <p>
+ * Note: a successful result from this method makes no guarantee that a subsequent call to {@link #read}
+ * will succeed. It is possible that the data resides in a data store on a remote node and, if that
+ * node goes down or a network failure occurs, a subsequent read would fail. Another scenario is if
+ * the data is deleted in between the calls to <code>exists</code> and <code>read</code>
+ *
+ * <p>
+ * Default implementation delegates to {@link #read(LogicalDatastoreType, InstanceIdentifier)}, implementations
+ * are advised to provide a more efficient override.
+ *
+ * @param store
+ * Logical data store from which read should occur.
+ * @param path
+ * Path which uniquely identifies subtree which client want to
+ * check existence of
+ * @return a CheckFuture containing the result of the check.
+ * <ul>
+ * <li>If the data at the supplied path exists, the Future returns a Boolean
+ * whose value is true, false otherwise</li>
+ * <li>If checking for the data fails, the Future will fail with a
+ * {@link ReadFailedException} or an exception derived from ReadFailedException.</li>
+ * </ul>
+ */
+ default CheckedFuture<Boolean, ReadFailedException> exists(final LogicalDatastoreType store,
+ final InstanceIdentifier<?> path) {
+ return MappingCheckedFuture.create(Futures.transform(read(store, path), Optional::isPresent,
+ MoreExecutors.directExecutor()), ReadFailedException.MAPPER);
+ }
}
return codec;
}
- protected final <D extends DataObject> CheckedFuture<Optional<D>,ReadFailedException> doRead(
+ protected final <D extends DataObject> CheckedFuture<Optional<D>, ReadFailedException> doRead(
final DOMDataReadTransaction readTx, final LogicalDatastoreType store,
final InstanceIdentifier<D> path) {
Preconditions.checkArgument(!path.isWildcarded(), "Invalid read of wildcarded path %s", path);
MoreExecutors.directExecutor()),
ReadFailedException.MAPPER);
}
+
+ protected final CheckedFuture<Boolean, ReadFailedException> doExists(
+ final DOMDataReadTransaction readTx, final LogicalDatastoreType store,
+ final InstanceIdentifier<?> path) {
+ Preconditions.checkArgument(!path.isWildcarded(), "Invalid read of wildcarded path %s", path);
+
+ return MappingCheckedFuture.create(readTx.exists(store, codec.toYangInstanceIdentifierBlocking(path)),
+ ReadFailedException.MAPPER);
+ }
}
}
@Override
- public <T extends DataObject> CheckedFuture<Optional<T>,ReadFailedException> read(
+ public <T extends DataObject> CheckedFuture<Optional<T>, ReadFailedException> read(
final LogicalDatastoreType store, final InstanceIdentifier<T> path) {
return doRead(getDelegate(),store, path);
}
+ @Override
+ public CheckedFuture<Boolean, ReadFailedException> exists(final LogicalDatastoreType store,
+ final InstanceIdentifier<?> path) {
+ return doExists(getDelegate(), store, path);
+ }
+
@Override
public void close() {
getDelegate().close();
final LogicalDatastoreType store, final InstanceIdentifier<T> path) {
return doRead(getDelegate(), store, path);
}
+
+ @Override
+ public CheckedFuture<Boolean, ReadFailedException> exists(final LogicalDatastoreType store,
+ final InstanceIdentifier<?> path) {
+ return doExists(getDelegate(), store, path);
+ }
}