*/
package org.opendaylight.controller.md.sal.common.api.data;
+import com.google.common.util.concurrent.CheckedFuture;
+import com.google.common.util.concurrent.ListenableFuture;
import org.opendaylight.controller.md.sal.common.api.TransactionStatus;
import org.opendaylight.yangtools.concepts.Path;
import org.opendaylight.yangtools.yang.common.RpcResult;
-import com.google.common.util.concurrent.CheckedFuture;
-import com.google.common.util.concurrent.ListenableFuture;
-
/**
* Write transaction provides mutation capabilities for a data tree.
*
* Initial state of write transaction is a stable snapshot of the current data tree.
* The state is captured when the transaction is created and its state and underlying
* data tree are not affected by other concurrently running transactions.
+ *
* <p>
* Write transactions are isolated from other concurrent write transactions. All
* writes are local to the transaction and represent only a proposal of state
* change for the data tree and it is not visible to any other concurrently running
* transaction.
+ *
* <p>
* Applications make changes to the local data tree in the transaction by via the
* <b>put</b>, <b>merge</b>, and <b>delete</b> operations.
* Stores a piece of data at a specified path. This acts as an add / replace
* operation, which is to say that whole subtree will be replaced by the
* specified data.
+ *
* <p>
* Performing the following put operations:
*
* 2) container { list [ b ] }
* </pre>
*
+ * <p>
* will result in the following data being present:
*
* <pre>
* Merges a piece of data with the existing data at a specified path. Any pre-existing data
* which is not explicitly overwritten will be preserved. This means that if you store a container,
* its child lists will be merged.
+ *
* <p>
* Performing the following merge operations:
*
* 2) container { list [ b ] }
* </pre>
*
+ * <p>
* will result in the following data being present:
*
* <pre>
* container { list [ a, b ] }
* </pre>
*
+ * <p>
* This also means that storing the container will preserve any
* augmentations which have been attached to it.
*
* <h2>Delete operation</h2>
* Removes a piece of data from a specified path.
+ *
* <p>
* After applying changes to the local data tree, applications publish the changes proposed in the
* transaction by calling {@link #submit} on the transaction. This seals the transaction
* (preventing any further writes using this transaction) and submits it to be
* processed and applied to global conceptual data tree.
+ *
* <p>
* The transaction commit may fail due to a concurrent transaction modifying and committing data in
* an incompatible way. See {@link #submit} for more concrete commit failure examples.
+ *
* <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.
/**
* Cancels the transaction.
*
- * Transactions can only be cancelled if it's status is
- * {@link TransactionStatus#NEW} or {@link TransactionStatus#SUBMITED}
+ * <p>
+ * Transactions can only be cancelled if it's state is new or submitted.
*
- * Invoking cancel() on {@link TransactionStatus#FAILED} or
- * {@link TransactionStatus#CANCELED} will have no effect, and transaction
+ * <p>
+ * Invoking cancel() on a failed or cancelled transaction will have no effect, and transaction
* is considered cancelled.
*
- * Invoking cancel() on finished transaction (future returned by {@link #submit()}
- * already completed with {@link TransactionStatus#COMMITED}) will always
+ * <p>
+ * Invoking cancel() on a finished transaction (future returned by {@link #submit()} already completed will always
* fail (return false).
*
- * @return <tt>false</tt> if the task could not be cancelled,
- * typically because it has already completed normally;
+ * @return <tt>false</tt> if the task could not be cancelled, typically because it has already completed normally
* <tt>true</tt> otherwise
*
*/
* @param path
* Data object path
* @throws IllegalStateException
- * if the transaction is no longer {@link TransactionStatus#NEW}
+ * if the transaction as already been submitted or cancelled
*/
void delete(LogicalDatastoreType store, P path);
/**
* Submits this transaction to be asynchronously applied to update the logical data tree.
* The returned CheckedFuture conveys the result of applying the data changes.
+ *
* <p>
* <b>Note:</b> It is strongly recommended to process the CheckedFuture result in an asynchronous
* manner rather than using the blocking get() method. See example usage below.
+ *
* <p>
* This call logically seals the transaction, which prevents the client from
* further changing data tree using this transaction. Any subsequent calls to
- * {@link #put(LogicalDatastoreType, Path, Object)},
- * {@link #merge(LogicalDatastoreType, Path, Object)} or
* {@link #delete(LogicalDatastoreType, Path)} will fail with
* {@link IllegalStateException}.
*
- * The transaction is marked as {@link TransactionStatus#SUBMITED} and
- * enqueued into the data store back-end for processing.
+ * <p>
+ * The transaction is marked as submitted and enqueued into the data store back-end for processing.
*
* <p>
* Whether or not the commit is successful is determined by versioning
* of the data tree and validation of registered commit participants
- * ({@link AsyncConfigurationCommitHandler})
- * if the transaction changes the data tree.
+ * ({@link AsyncConfigurationCommitHandler}) if the transaction changes the data tree.
+ *
* <p>
* The effects of a successful commit of data depends on data change listeners
* ({@link AsyncDataChangeListener}) and commit participants
* ({@link AsyncConfigurationCommitHandler}) that are registered with the data broker.
- * <p>
+ *
* <h3>Example usage:</h3>
* <pre>
* private void doWrite( final int tries ) {
* WriteTransaction writeTx = dataBroker.newWriteOnlyTransaction();
*
* MyDataObject data = ...;
- * InstanceIdentifier<MyDataObject> path = ...;
+ * InstanceIdentifier<MyDataObject> path = ...;
* writeTx.put( LogicalDatastoreType.OPERATIONAL, path, data );
*
- * Futures.addCallback( writeTx.submit(), new FutureCallback<Void>() {
+ * Futures.addCallback( writeTx.submit(), new FutureCallback<Void>() {
* public void onSuccess( Void result ) {
* // succeeded
* }
*
* public void onFailure( Throwable t ) {
* if( t instanceof OptimisticLockFailedException ) {
- * if( ( tries - 1 ) > 0 ) {
+ * if( ( tries - 1 ) > 0 ) {
* // do retry
* doWrite( tries - 1 );
* } else {
* doWrite( 2 );
* </pre>
* <h2>Failure scenarios</h2>
+ *
* <p>
* Transaction may fail because of multiple reasons, such as
* <ul>
*
* <h3>Change compatibility</h3>
*
+ * <p>
* There are several sets of changes which could be considered incompatible
* between two transactions which are derived from same initial state.
* Rules for conflict detection applies recursively for each subtree
*
* <h4>Change compatibility of leafs, leaf-list items</h4>
*
+ * <p>
* Following table shows state changes and failures between two concurrent transactions,
* which are based on same initial state, Tx 1 completes successfully
* before Tx 2 is submitted.
*
- * <table>
+ * <table summary="">
* <tr><th>Initial state</th><th>Tx 1</th><th>Tx 2</th><th>Result</th></tr>
* <tr><td>Empty</td><td>put(A,1)</td><td>put(A,2)</td><td>Tx 2 will fail, state is A=1</td></tr>
* <tr><td>Empty</td><td>put(A,1)</td><td>merge(A,2)</td><td>A=2</td></tr>
*
* <h4>Change compatibility of subtrees</h4>
*
+ * <p>
* Following table shows state changes and failures between two concurrent transactions,
* which are based on same initial state, Tx 1 completes successfully
* before Tx 2 is submitted.
*
- * <table>
+ * <table summary="">
* <tr><th>Initial state</th><th>Tx 1</th><th>Tx 2</th><th>Result</th></tr>
*
* <tr><td>Empty</td><td>put(TOP,[])</td><td>put(TOP,[])</td><td>Tx 2 will fail, state is TOP=[]</td></tr>
* <tr><td>Empty</td><td>put(TOP,[])</td><td>merge(TOP,[])</td><td>TOP=[]</td></tr>
*
- * <tr><td>Empty</td><td>put(TOP,[FOO=1])</td><td>put(TOP,[BAR=1])</td><td>Tx 2 will fail, state is TOP=[FOO=1]</td></tr>
+ * <tr><td>Empty</td><td>put(TOP,[FOO=1])</td><td>put(TOP,[BAR=1])</td><td>Tx 2 will fail, state is TOP=[FOO=1]
+ * </td></tr>
* <tr><td>Empty</td><td>put(TOP,[FOO=1])</td><td>merge(TOP,[BAR=1])</td><td>TOP=[FOO=1,BAR=1]</td></tr>
*
- * <tr><td>Empty</td><td>merge(TOP,[FOO=1])</td><td>put(TOP,[BAR=1])</td><td>Tx 2 will fail, state is TOP=[FOO=1]</td></tr>
+ * <tr><td>Empty</td><td>merge(TOP,[FOO=1])</td><td>put(TOP,[BAR=1])</td><td>Tx 2 will fail, state is TOP=[FOO=1]
+ * </td></tr>
* <tr><td>Empty</td><td>merge(TOP,[FOO=1])</td><td>merge(TOP,[BAR=1])</td><td>TOP=[FOO=1,BAR=1]</td></tr>
*
- * <tr><td>TOP=[]</td><td>put(TOP,[FOO=1])</td><td>put(TOP,[BAR=1])</td><td>Tx 2 will fail, state is TOP=[FOO=1]</td></tr>
+ * <tr><td>TOP=[]</td><td>put(TOP,[FOO=1])</td><td>put(TOP,[BAR=1])</td><td>Tx 2 will fail, state is TOP=[FOO=1]
+ * </td></tr>
* <tr><td>TOP=[]</td><td>put(TOP,[FOO=1])</td><td>merge(TOP,[BAR=1])</td><td>state is TOP=[FOO=1,BAR=1]</td></tr>
- * <tr><td>TOP=[]</td><td>merge(TOP,[FOO=1])</td><td>put(TOP,[BAR=1])</td><td>Tx 2 will fail, state is TOP=[FOO=1]</td></tr>
+ * <tr><td>TOP=[]</td><td>merge(TOP,[FOO=1])</td><td>put(TOP,[BAR=1])</td><td>Tx 2 will fail, state is TOP=[FOO=1]
+ * </td></tr>
* <tr><td>TOP=[]</td><td>merge(TOP,[FOO=1])</td><td>merge(TOP,[BAR=1])</td><td>state is TOP=[FOO=1,BAR=1]</td></tr>
- * <tr><td>TOP=[]</td><td>delete(TOP)</td><td>put(TOP,[BAR=1])</td><td>Tx 2 will fail, state is empty store</td></tr>
+ * <tr><td>TOP=[]</td><td>delete(TOP)</td><td>put(TOP,[BAR=1])</td><td>Tx 2 will fail, state is empty store
+ * </td></tr>
* <tr><td>TOP=[]</td><td>delete(TOP)</td><td>merge(TOP,[BAR=1])</td><td>state is TOP=[BAR=1]</td></tr>
*
* <tr><td>TOP=[]</td><td>put(TOP/FOO,1)</td><td>put(TOP/BAR,1])</td><td>state is TOP=[FOO=1,BAR=1]</td></tr>
* <tr><td>TOP=[]</td><td>merge(TOP/FOO,1)</td><td>put(TOP/BAR,1)</td><td>state is TOP=[FOO=1,BAR=1]</td></tr>
* <tr><td>TOP=[]</td><td>merge(TOP/FOO,1)</td><td>merge(TOP/BAR,1)</td><td>state is TOP=[FOO=1,BAR=1]</td></tr>
* <tr><td>TOP=[]</td><td>delete(TOP)</td><td>put(TOP/BAR,1)</td><td>Tx 2 will fail, state is empty store</td></tr>
- * <tr><td>TOP=[]</td><td>delete(TOP)</td><td>merge(TOP/BAR,1]</td><td>Tx 2 will fail, state is empty store</td></tr>
+ * <tr><td>TOP=[]</td><td>delete(TOP)</td><td>merge(TOP/BAR,1]</td><td>Tx 2 will fail, state is empty store
+ * </td></tr>
*
* <tr><td>TOP=[FOO=1]</td><td>put(TOP/FOO,2)</td><td>put(TOP/BAR,1)</td><td>state is TOP=[FOO=2,BAR=1]</td></tr>
* <tr><td>TOP=[FOO=1]</td><td>put(TOP/FOO,2)</td><td>merge(TOP/BAR,1)</td><td>state is TOP=[FOO=2,BAR=1]</td></tr>
* <tr><td>TOP=[FOO=1]</td><td>merge(TOP/FOO,2)</td><td>put(TOP/BAR,1)</td><td>state is TOP=[FOO=2,BAR=1]</td></tr>
- * <tr><td>TOP=[FOO=1]</td><td>merge(TOP/FOO,2)</td><td>merge(TOP/BAR,1)</td><td>state is TOP=[FOO=2,BAR=1]</td></tr>
+ * <tr><td>TOP=[FOO=1]</td><td>merge(TOP/FOO,2)</td><td>merge(TOP/BAR,1)</td><td>state is TOP=[FOO=2,BAR=1]
+ * </td></tr>
* <tr><td>TOP=[FOO=1]</td><td>delete(TOP/FOO)</td><td>put(TOP/BAR,1)</td><td>state is TOP=[BAR=1]</td></tr>
* <tr><td>TOP=[FOO=1]</td><td>delete(TOP/FOO)</td><td>merge(TOP/BAR,1]</td><td>state is TOP=[BAR=1]</td></tr>
* </table>
*
* <h4>Conflict of two transactions</h4>
*
+ * <p>
* This example illustrates two concurrent transactions, which derived from
* same initial state of data tree and proposes conflicting modifications.
*
* ListenebleFuture futureB = txB.submit(); // transaction B is sealed and submitted
* </pre>
*
+ * <p>
* Commit of transaction A will be processed asynchronously and data tree
* will be updated to contain value <code>A</code> for <code>PATH</code>.
* Returned {@link ListenableFuture} will successfully complete once
* state is applied to data tree.
*
+ * <p>
* Commit of Transaction B will fail, because previous transaction also
* modified path in a concurrent way. The state introduced by transaction B
* will not be applied. Returned {@link ListenableFuture} object will fail
* derived from TransactionCommitFailedException.
*
* @throws IllegalStateException
- * if the transaction is not {@link TransactionStatus#NEW}
+ * if the transaction is not new
*/
CheckedFuture<Void,TransactionCommitFailedException> submit();
/**
+ * Deprecated.
+ *
* @deprecated Use {@link #submit()} instead.
*/
@Deprecated
- ListenableFuture<RpcResult<TransactionStatus>> commit();
-
+ default ListenableFuture<RpcResult<TransactionStatus>> commit() {
+ throw new UnsupportedOperationException("commit() is deprecated, use submit() instead");
+ }
}
Code Review / controller.git / blobdiff