import org.opendaylight.yangtools.concepts.Path;
+/**
+ * A factory which allocates new transactions to operate on the data
+ * tree.
+ *
+ * <p>
+ * <b>Note:</b> This interface is not intended to be used directly, but rather
+ * via subinterfaces which introduces additional semantics to allocated
+ * transactions.
+ * <ul>
+ * <li> {@link AsyncDataBroker}
+ * <li> {@link TransactionChain}
+ * </ul>
+ *
+ * <p>
+ * All operations on the data tree are performed via one of the transactions:
+ * <ul>
+ * <li>Read-Only - allocated using {@link #newReadOnlyTransaction()}
+ * <li>Write-Only - allocated using {@link #newWriteOnlyTransaction()}
+ * <li>Read-Write - allocated using {@link #newReadWriteTransaction()}
+ * </ul>
+ *
+ * <p>
+ * These transactions provides a stable isolated view of the data tree, which is
+ * guaranteed to be not affected by other concurrent transactions, until
+ * transaction is committed.
+ *
+ * <p>
+ * For a detailed explanation of how transaction are isolated and how transaction-local
+ * changes are committed to global data tree, see
+ * {@link AsyncReadTransaction}, {@link AsyncWriteTransaction},
+ * {@link AsyncReadWriteTransaction} and {@link AsyncWriteTransaction#submit()}.
+ *
+ * <p>
+ * It is strongly recommended to use the type of transaction, which
+ * provides only the minimal capabilities you need. This allows for
+ * optimizations at the data broker / data store level. For example,
+ * implementations may optimize the transaction for reading if they know ahead
+ * of time that you only need to read data - such as not keeping additional meta-data,
+ * which may be required for write transactions.
+ *
+ * <p>
+ * <b>Implementation Note:</b> This interface is not intended to be implemented
+ * by users of MD-SAL, but only to be consumed by them.
+ *
+ * @see AsyncDataBroker
+ * @see TransactionChain
+ *
+ * @param <P>
+ * Type of path (subtree identifier), which represents location in
+ * tree
+ * @param <D>
+ * Type of data (payload), which represents data payload
+ */
+@Deprecated(forRemoval = true)
public interface AsyncDataTransactionFactory<P extends Path<P>, D> {
- AsyncReadTransaction<P, D> newReadOnlyTransaction();
+ /**
+ * Allocates a new read-only transaction which provides an immutable snapshot of the data tree.
+ *
+ * <p>
+ * The view of data tree is an immutable snapshot of current data tree state when
+ * transaction was allocated.
+ *
+ * @return new read-only transaction
+ */
+ AsyncReadOnlyTransaction<P, D> newReadOnlyTransaction();
+ /**
+ * Allocates new read-write transaction which provides a mutable view of the data
+ * tree.
+ *
+ * <p>
+ * Preconditions for mutation of data tree are captured from the snapshot of
+ * data tree state, when the transaction is allocated. If data was
+ * changed during transaction in an incompatible way then the commit of this transaction
+ * will fail. See {@link AsyncWriteTransaction#submit()} for more
+ * details about conflicting and not-conflicting changes and
+ * failure scenarios.
+ *
+ * @return new read-write transaction
+ */
AsyncReadWriteTransaction<P, D> newReadWriteTransaction();
- AsyncWriteTransaction<P,D> newWriteOnlyTransaction();
+ /**
+ * Allocates new write-only transaction based on latest state of data
+ * tree.
+ *
+ * <p>
+ * Preconditions for mutation of data tree are captured from the snapshot of
+ * data tree state, when the transaction is allocated. If data was
+ * changed during transaction in an incompatible way then the commit of this transaction
+ * will fail. See {@link AsyncWriteTransaction#submit()} for more
+ * details about conflicting and not-conflicting changes and
+ * failure scenarios.
+ *
+ * <p>
+ * Since this transaction does not provide a view of the data it SHOULD BE
+ * used only by callers which are exclusive writers (exporters of data)
+ * to the subtree they modify. This prevents optimistic
+ * lock failures as described in {@link AsyncWriteTransaction#submit()}.
+ *
+ * <p>
+ * Exclusivity of writers to particular subtree SHOULD BE enforced by
+ * external locking mechanism.
+ *
+ * @return new write-only transaction
+ */
+ AsyncWriteTransaction<P, D> newWriteOnlyTransaction();
}