+/*
+ * Copyright (c) 2015 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.cluster.databroker;
+
+import com.google.common.base.Preconditions;
+import com.google.common.util.concurrent.CheckedFuture;
+import com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.ListenableFuture;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Map;
+import java.util.concurrent.Future;
+import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
+import org.opendaylight.controller.md.sal.common.api.TransactionStatus;
+import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
+import org.opendaylight.controller.md.sal.common.api.data.TransactionCommitFailedException;
+import org.opendaylight.controller.md.sal.common.impl.service.AbstractDataTransaction;
+import org.opendaylight.controller.md.sal.dom.api.DOMDataWriteTransaction;
+import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort;
+import org.opendaylight.controller.sal.core.spi.data.DOMStoreTransactionFactory;
+import org.opendaylight.controller.sal.core.spi.data.DOMStoreWriteTransaction;
+import org.opendaylight.yangtools.yang.common.RpcResult;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
+import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public abstract class AbstractDOMBrokerWriteTransaction<T extends DOMStoreWriteTransaction>
+ extends AbstractDOMBrokerTransaction<T> implements DOMDataWriteTransaction {
+
+ private static final AtomicReferenceFieldUpdater<AbstractDOMBrokerWriteTransaction, AbstractDOMTransactionFactory> IMPL_UPDATER =
+ AtomicReferenceFieldUpdater.newUpdater(AbstractDOMBrokerWriteTransaction.class, AbstractDOMTransactionFactory.class, "commitImpl");
+ private static final AtomicReferenceFieldUpdater<AbstractDOMBrokerWriteTransaction, Future> FUTURE_UPDATER =
+ AtomicReferenceFieldUpdater.newUpdater(AbstractDOMBrokerWriteTransaction.class, Future.class, "commitFuture");
+ private static final Logger LOG = LoggerFactory.getLogger(AbstractDOMBrokerWriteTransaction.class);
+ private static final Future<?> CANCELLED_FUTURE = Futures.immediateCancelledFuture();
+
+ /**
+ * Implementation of real commit. It also acts as an indication that
+ * the transaction is running -- which we flip atomically using
+ * {@link #IMPL_UPDATER}.
+ */
+ private volatile AbstractDOMTransactionFactory<?> commitImpl;
+
+ /**
+ * Future task of transaction commit. It starts off as null, but is
+ * set appropriately on {@link #submit()} and {@link #cancel()} via
+ * {@link AtomicReferenceFieldUpdater#lazySet(Object, Object)}.
+ *
+ * Lazy set is safe for use because it is only referenced to in the
+ * {@link #cancel()} slow path, where we will busy-wait for it. The
+ * fast path gets the benefit of a store-store barrier instead of the
+ * usual store-load barrier.
+ */
+ private volatile Future<?> commitFuture;
+
+ protected AbstractDOMBrokerWriteTransaction(final Object identifier,
+ final Map<LogicalDatastoreType, ? extends DOMStoreTransactionFactory> storeTxFactories, final AbstractDOMTransactionFactory<?> commitImpl) {
+ super(identifier, storeTxFactories);
+ this.commitImpl = Preconditions.checkNotNull(commitImpl, "commitImpl must not be null.");
+ }
+
+ @Override
+ public void put(final LogicalDatastoreType store, final YangInstanceIdentifier path, final NormalizedNode<?, ?> data) {
+ checkRunning(commitImpl);
+ checkInstanceIdentifierReferencesData(path,data);
+ getSubtransaction(store).write(path, data);
+ }
+
+ private static void checkInstanceIdentifierReferencesData(final YangInstanceIdentifier path,
+ final NormalizedNode<?, ?> data) {
+ final PathArgument lastArg = path.getLastPathArgument();
+ Preconditions.checkArgument(
+ (lastArg == data.getIdentifier()) || (lastArg != null && lastArg.equals(data.getIdentifier())),
+ "Instance identifier references %s but data identifier is %s", lastArg, data);
+ }
+
+ @Override
+ public void delete(final LogicalDatastoreType store, final YangInstanceIdentifier path) {
+ checkRunning(commitImpl);
+ getSubtransaction(store).delete(path);
+ }
+
+ @Override
+ public void merge(final LogicalDatastoreType store, final YangInstanceIdentifier path, final NormalizedNode<?, ?> data) {
+ checkRunning(commitImpl);
+ checkInstanceIdentifierReferencesData(path, data);
+ getSubtransaction(store).merge(path, data);
+ }
+
+ @Override
+ public boolean cancel() {
+ final AbstractDOMTransactionFactory<?> impl = IMPL_UPDATER.getAndSet(this, null);
+ if (impl != null) {
+ LOG.trace("Transaction {} cancelled before submit", getIdentifier());
+ FUTURE_UPDATER.lazySet(this, CANCELLED_FUTURE);
+ closeSubtransactions();
+ return true;
+ }
+
+ // The transaction is in process of being submitted or cancelled. Busy-wait
+ // for the corresponding future.
+ Future<?> future;
+ do {
+ future = commitFuture;
+ } while (future == null);
+
+ return future.cancel(false);
+ }
+
+ @Deprecated
+ @Override
+ public ListenableFuture<RpcResult<TransactionStatus>> commit() {
+ return AbstractDataTransaction.convertToLegacyCommitFuture(submit());
+ }
+
+ @Override
+ public CheckedFuture<Void, TransactionCommitFailedException> submit() {
+ final AbstractDOMTransactionFactory<?> impl = IMPL_UPDATER.getAndSet(this, null);
+ checkRunning(impl);
+
+ final Collection<T> txns = getSubtransactions();
+ final Collection<DOMStoreThreePhaseCommitCohort> cohorts = new ArrayList<>(txns.size());
+
+ // FIXME: deal with errors thrown by backed (ready and submit can fail in theory)
+ for (final T txn : txns) {
+ cohorts.add(txn.ready());
+ }
+
+ final CheckedFuture<Void, TransactionCommitFailedException> ret = impl.submit(this, cohorts);
+ FUTURE_UPDATER.lazySet(this, ret);
+ return ret;
+ }
+
+ private void checkRunning(final AbstractDOMTransactionFactory<?> impl) {
+ Preconditions.checkState(impl != null, "Transaction %s is no longer running", getIdentifier());
+ }
+
+}
Code Review / controller.git / commitdiff