--- /dev/null
+/*
+ * 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;
+
+/**
+ * A chain of transactions. Transactions in a chain need to be committed in
+ * sequence and each transaction must see the effects of previous transactions
+ * as if they happened. A chain makes no guarantees of atomicity, in fact
+ * transactions are committed as soon as possible.
+ *
+ *
+ */
+public interface DOMStoreTransactionChain extends DOMStoreTransactionFactory, AutoCloseable {
+
+ /**
+ * Create a new read only transaction which will continue the chain. The
+ * previous write transaction has to be either READY or CANCELLED.
+ *
+ * If previous write transaction was already commited to data store, new
+ * read-only transaction is same as obtained via {@link DOMStore#newReadOnlyTransaction()}
+ * and contains merged result of previous one and current state of data store.
+ *
+ * Otherwise read-only transaction presents isolated view as if previous read-write
+ * transaction was successful. State which was introduced by other transactions
+ * outside this transaction chain after creation of previous transaction is not visible.
+ *
+ * @return New transaction in the chain.
+ * @throws IllegalStateException
+ * if the previous transaction was not READY or CANCELLED, or
+ * if the chain has been closed.
+ */
+ @Override
+ public DOMStoreReadTransaction newReadOnlyTransaction();
+
+ /**
+ * Create a new read write transaction which will continue the chain. The
+ * previous read-write transaction has to be either COMMITED or CANCELLED.
+ *
+ * If previous write transaction was already commited to data store, new
+ * read-write transaction is same as obtained via {@link DOMStore#newReadWriteTransaction()}
+ * and contains merged result of previous one and current state of data store.
+ *
+ * Otherwise read-write transaction presents isolated view as if previous read-write
+ * transaction was successful. State which was introduced by other transactions
+ * outside this transaction chain after creation of previous transaction is not visible.
+ *
+ * @return New transaction in the chain.
+ * @throws IllegalStateException
+ * if the previous transaction was not READY or CANCELLED, or
+ * if the chain has been closed.
+ */
+ @Override
+ public DOMStoreReadWriteTransaction newReadWriteTransaction();
+
+ /**
+ * Create a new read write transaction which will continue the chain. The
+ * previous read-write transaction has to be either READY or CANCELLED.
+ *
+ *
+ * @return New transaction in the chain.
+ * @throws IllegalStateException
+ * if the previous transaction was not READY or CANCELLED, or
+ * if the chain has been closed.
+ */
+ @Override
+ public DOMStoreWriteTransaction newWriteOnlyTransaction();
+
+
+ /**
+ * Closes Transaction Chain.
+ *
+ * Close method of transaction chain does not guarantee that
+ * last alocated transaction is ready or was submitted.
+ *
+ * @throws IllegalStateException If any of the outstanding created transactions was not canceled or ready.
+ */
+ @Override
+ public void close();
+
+}