- private class DOMStoreTransactionChainImpl extends TransactionReadyPrototype implements DOMStoreTransactionChain {
- @GuardedBy("this")
- private SnapshotBackedWriteTransaction allocatedTransaction;
- @GuardedBy("this")
- private DataTreeSnapshot readySnapshot;
- @GuardedBy("this")
- private boolean chainFailed = false;
-
- @GuardedBy("this")
- private void checkFailed() {
- Preconditions.checkState(!chainFailed, "Transaction chain is failed.");
- }
-
- @GuardedBy("this")
- private DataTreeSnapshot getSnapshot() {
- checkFailed();
-
- if (allocatedTransaction != null) {
- Preconditions.checkState(readySnapshot != null, "Previous transaction %s is not ready yet", allocatedTransaction.getIdentifier());
- return readySnapshot;
- } else {
- return dataTree.takeSnapshot();
- }
- }
-
- @GuardedBy("this")
- private <T extends SnapshotBackedWriteTransaction> T recordTransaction(final T transaction) {
- allocatedTransaction = transaction;
- readySnapshot = null;
- return transaction;
- }
-
- @Override
- public synchronized DOMStoreReadTransaction newReadOnlyTransaction() {
- final DataTreeSnapshot snapshot = getSnapshot();
- return new SnapshotBackedReadTransaction(nextIdentifier(), getDebugTransactions(), snapshot);
- }
-
- @Override
- public synchronized DOMStoreReadWriteTransaction newReadWriteTransaction() {
- final DataTreeSnapshot snapshot = getSnapshot();
- return recordTransaction(new SnapshotBackedReadWriteTransaction(nextIdentifier(),
- getDebugTransactions(), snapshot, this));
- }
-
- @Override
- public synchronized DOMStoreWriteTransaction newWriteOnlyTransaction() {
- final DataTreeSnapshot snapshot = getSnapshot();
- return recordTransaction(new SnapshotBackedWriteTransaction(nextIdentifier(),
- getDebugTransactions(), snapshot, this));
- }
-
- @Override
- protected synchronized void transactionAborted(final SnapshotBackedWriteTransaction tx) {
- if (tx.equals(allocatedTransaction)) {
- Preconditions.checkState(readySnapshot == null, "Unexpected abort of transaction %s with ready snapshot %s", tx, readySnapshot);
- allocatedTransaction = null;
- }
- }
-
- @Override
- protected synchronized DOMStoreThreePhaseCommitCohort transactionReady(final SnapshotBackedWriteTransaction tx, final DataTreeModification tree) {
- Preconditions.checkState(tx.equals(allocatedTransaction), "Mis-ordered ready transaction %s last allocated was %s", tx, allocatedTransaction);
- if (readySnapshot != null) {
- // The snapshot should have been cleared
- LOG.warn("Uncleared snapshot {} encountered, overwritten with transaction {} snapshot {}", readySnapshot, tx, tree);
- }
-
- final DOMStoreThreePhaseCommitCohort cohort = InMemoryDOMDataStore.this.transactionReady(tx, tree);
- readySnapshot = tree;
- return new ChainedTransactionCommitImpl(tx, cohort, this);
- }
-
- @Override
- public void close() {
- // FIXME: this call doesn't look right here - listeningExecutor is shared and owned
- // by the outer class.
- //listeningExecutor.shutdownNow();
- }
-
- protected synchronized void onTransactionFailed(final SnapshotBackedWriteTransaction transaction,
- final Throwable t) {
- chainFailed = true;
- }
-
- public synchronized void onTransactionCommited(final SnapshotBackedWriteTransaction transaction) {
- // If the committed transaction was the one we allocated last,
- // we clear it and the ready snapshot, so the next transaction
- // allocated refers to the data tree directly.
- if (transaction.equals(allocatedTransaction)) {
- if (readySnapshot == null) {
- LOG.warn("Transaction {} committed while no ready snapshot present", transaction);
- }
-
- allocatedTransaction = null;
- readySnapshot = null;
- }
- }
- }
-
- private static class ChainedTransactionCommitImpl implements DOMStoreThreePhaseCommitCohort {
- private final SnapshotBackedWriteTransaction transaction;
- private final DOMStoreThreePhaseCommitCohort delegate;
- private final DOMStoreTransactionChainImpl txChain;
-
- protected ChainedTransactionCommitImpl(final SnapshotBackedWriteTransaction transaction,
- final DOMStoreThreePhaseCommitCohort delegate, final DOMStoreTransactionChainImpl txChain) {
- this.transaction = transaction;
- this.delegate = delegate;
- this.txChain = txChain;
- }
-
- @Override
- public ListenableFuture<Boolean> canCommit() {
- return delegate.canCommit();
- }
-
- @Override
- public ListenableFuture<Void> preCommit() {
- return delegate.preCommit();
- }
-
- @Override
- public ListenableFuture<Void> abort() {
- return delegate.abort();
- }
-
- @Override
- public ListenableFuture<Void> commit() {
- ListenableFuture<Void> commitFuture = delegate.commit();
- Futures.addCallback(commitFuture, new FutureCallback<Void>() {
- @Override
- public void onFailure(final Throwable t) {
- txChain.onTransactionFailed(transaction, t);
- }
-
- @Override
- public void onSuccess(final Void result) {
- txChain.onTransactionCommited(transaction);
- }
- });
- return commitFuture;
- }
- }
-
- private class ThreePhaseCommitImpl implements DOMStoreThreePhaseCommitCohort {
Code Review / controller.git / blobdiff