* the committing transaction completes successfully, the scratch transaction
* is enqueued as soon as it is ready.
*
+ * <p>
* This mode of operation means that there is no inherent isolation between
* the front-end transactions and transactions cannot be reasonably cancelled.
*
+ * <p>
* It furthermore means that the transactions returned by {@link #newReadOnlyTransaction()}
* counts as an outstanding transaction and the user may not allocate multiple
* read-only transactions at the same time.
* This updater is used to manipulate the "ready" transaction. We perform only atomic
* get-and-set on it.
*/
- private static final AtomicReferenceFieldUpdater<PingPongTransactionChain, PingPongTransaction> READY_UPDATER =
- AtomicReferenceFieldUpdater.newUpdater(PingPongTransactionChain.class, PingPongTransaction.class, "readyTx");
+ private static final AtomicReferenceFieldUpdater<PingPongTransactionChain, PingPongTransaction> READY_UPDATER
+ = AtomicReferenceFieldUpdater
+ .newUpdater(PingPongTransactionChain.class, PingPongTransaction.class, "readyTx");
private volatile PingPongTransaction readyTx;
/**
* us. We perform on compare-and-swap to ensure we properly detect when a user is
* attempting to allocated multiple transactions concurrently.
*/
- private static final AtomicReferenceFieldUpdater<PingPongTransactionChain, PingPongTransaction> LOCKED_UPDATER =
- AtomicReferenceFieldUpdater.newUpdater(PingPongTransactionChain.class, PingPongTransaction.class, "lockedTx");
+ private static final AtomicReferenceFieldUpdater<PingPongTransactionChain, PingPongTransaction> LOCKED_UPDATER
+ = AtomicReferenceFieldUpdater
+ .newUpdater(PingPongTransactionChain.class, PingPongTransaction.class, "lockedTx");
private volatile PingPongTransaction lockedTx;
/**
* This updater is used to manipulate the "inflight" transaction. There can be at most
* one of these at any given time. We perform only compare-and-swap on these.
*/
- private static final AtomicReferenceFieldUpdater<PingPongTransactionChain, PingPongTransaction> INFLIGHT_UPDATER =
- AtomicReferenceFieldUpdater.newUpdater(PingPongTransactionChain.class, PingPongTransaction.class, "inflightTx");
+ private static final AtomicReferenceFieldUpdater<PingPongTransactionChain, PingPongTransaction> INFLIGHT_UPDATER
+ = AtomicReferenceFieldUpdater
+ .newUpdater(PingPongTransactionChain.class, PingPongTransaction.class, "inflightTx");
private volatile PingPongTransaction inflightTx;
PingPongTransactionChain(final DOMDataBroker broker, final TransactionChainListener listener) {
this.delegate = broker.createTransactionChain(new TransactionChainListener() {
@Override
public void onTransactionChainFailed(final TransactionChain<?, ?> chain,
- final AsyncTransaction<?, ?> transaction, final Throwable cause) {
+ final AsyncTransaction<?, ?> transaction, final Throwable cause) {
LOG.debug("Transaction chain {} reported failure in {}", chain, transaction, cause);
delegateFailed(chain, cause);
}
Preconditions.checkState(shutdownTx == null, "Transaction chain %s has been shut down", this);
if (deadTx != null) {
- throw new IllegalStateException(String.format(
- "Transaction chain %s has failed due to transaction %s being canceled", this, deadTx.getKey()),
- deadTx.getValue());
+ throw new IllegalStateException(
+ String.format("Transaction chain %s has failed due to transaction %s being canceled", this,
+ deadTx.getKey()), deadTx.getValue());
}
final DOMDataReadWriteTransaction delegateTx = delegate.newReadWriteTransaction();
if (!LOCKED_UPDATER.compareAndSet(this, null, newTx)) {
delegateTx.cancel();
- throw new IllegalStateException(String.format("New transaction %s raced with transaction %s", newTx, lockedTx));
+ throw new IllegalStateException(
+ String.format("New transaction %s raced with transaction %s", newTx, lockedTx));
}
return newTx;
if (!LOCKED_UPDATER.compareAndSet(this, null, oldTx)) {
// Ouch. Delegate chain has not detected a duplicate transaction allocation. This is the best we can do.
oldTx.getTransaction().cancel();
- throw new IllegalStateException(String.format("Reusable transaction %s raced with transaction %s", oldTx, lockedTx));
+ throw new IllegalStateException(
+ String.format("Reusable transaction %s raced with transaction %s", oldTx, lockedTx));
}
return oldTx;
}
@Override
- public void onFailure(final Throwable t) {
- transactionFailed(tx, t);
+ public void onFailure(final Throwable throwable) {
+ transactionFailed(tx, throwable);
}
}, MoreExecutors.directExecutor());
}
processNextTransaction(tx);
}
- void transactionFailed(final PingPongTransaction tx, final Throwable t) {
- LOG.debug("Transaction {} failed", tx, t);
+ void transactionFailed(final PingPongTransaction tx, final Throwable throwable) {
+ LOG.debug("Transaction {} failed", tx, throwable);
- tx.onFailure(t);
+ tx.onFailure(throwable);
processNextTransaction(tx);
}
* and return false for everything else. Cancelling such a transaction will result in all transactions in the
* batch to be cancelled.
*
- * @param tx Backend shared transaction
- * @param frontendTx
- * @param isOpen indicator whether the transaction was already closed
+ * @param tx Backend shared transaction
+ * @param frontendTx transaction
+ * @param isOpen indicator whether the transaction was already closed
*/
synchronized void cancelTransaction(final PingPongTransaction tx, final DOMDataReadWriteTransaction frontendTx) {
// Attempt to unlock the operation.
// transaction chain, too. Since we just came off of a locked transaction, we do not have a ready transaction
// at the moment, but there may be some transaction in-flight. So we proceed to shutdown the backend chain
// and mark the fact that we should be turning its completion into a failure.
- deadTx = new SimpleImmutableEntry<>(tx,
- new CancellationException("Transaction " + frontendTx + " canceled").fillInStackTrace());
+ deadTx = new SimpleImmutableEntry<>(tx, new CancellationException("Transaction " + frontendTx + " canceled")
+ .fillInStackTrace());
delegate.close();
}
@Override
public synchronized void close() {
final PingPongTransaction notLocked = lockedTx;
- Preconditions.checkState(notLocked == null, "Attempted to close chain with outstanding transaction %s",
- notLocked);
+ Preconditions
+ .checkState(notLocked == null, "Attempted to close chain with outstanding transaction %s", notLocked);
// This is not reliable, but if we observe it to be null and the process has already completed,
// the backend transaction chain will throw the appropriate error.
@Override
public CheckedFuture<Boolean, ReadFailedException> exists(final LogicalDatastoreType store,
- final YangInstanceIdentifier path) {
+ final YangInstanceIdentifier path) {
return tx.getTransaction().exists(store, path);
}
Code Review / controller.git / blobdiff