2 * Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.controller.md.sal.dom.broker.impl;
10 import static com.google.common.base.Preconditions.checkState;
11 import static java.util.Objects.requireNonNull;
13 import com.google.common.base.Supplier;
14 import com.google.common.util.concurrent.FluentFuture;
15 import com.google.common.util.concurrent.Futures;
16 import com.google.common.util.concurrent.ListenableFuture;
17 import java.util.ArrayList;
18 import java.util.Collection;
20 import java.util.concurrent.Future;
21 import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
22 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
23 import org.opendaylight.controller.md.sal.dom.api.DOMDataWriteTransaction;
24 import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort;
25 import org.opendaylight.controller.sal.core.spi.data.DOMStoreWriteTransaction;
26 import org.opendaylight.mdsal.common.api.CommitInfo;
27 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
28 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
29 import org.slf4j.Logger;
30 import org.slf4j.LoggerFactory;
33 * Read-Write Transaction, which is composed of several
34 * {@link DOMStoreWriteTransaction} transactions. A sub-transaction is selected by
35 * {@link LogicalDatastoreType} type parameter in:
39 * <li>{@link #put(LogicalDatastoreType, YangInstanceIdentifier, NormalizedNode)}
40 * <li>{@link #delete(LogicalDatastoreType, YangInstanceIdentifier)}
41 * <li>{@link #merge(LogicalDatastoreType, YangInstanceIdentifier, NormalizedNode)}
45 * {@link #commit()} will result in invocation of
46 * {@link DOMDataCommitImplementation#submit(org.opendaylight.controller.md.sal.dom.api.DOMDataWriteTransaction,
47 * Iterable)} invocation with all {@link org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort}
48 * for underlying transactions.
50 * @param <T> Subtype of {@link DOMStoreWriteTransaction} which is used as
54 class DOMForwardedWriteTransaction<T extends DOMStoreWriteTransaction> extends
55 AbstractDOMForwardedCompositeTransaction<LogicalDatastoreType, T> implements DOMDataWriteTransaction {
56 @SuppressWarnings("rawtypes")
57 private static final AtomicReferenceFieldUpdater<DOMForwardedWriteTransaction,
58 AbstractDOMForwardedTransactionFactory>
59 IMPL_UPDATER = AtomicReferenceFieldUpdater
60 .newUpdater(DOMForwardedWriteTransaction.class, AbstractDOMForwardedTransactionFactory.class, "commitImpl");
61 @SuppressWarnings("rawtypes")
62 private static final AtomicReferenceFieldUpdater<DOMForwardedWriteTransaction, Future> FUTURE_UPDATER
63 = AtomicReferenceFieldUpdater.newUpdater(DOMForwardedWriteTransaction.class, Future.class, "commitFuture");
64 private static final Logger LOG = LoggerFactory.getLogger(DOMForwardedWriteTransaction.class);
65 private static final Future<?> CANCELLED_FUTURE = Futures.immediateCancelledFuture();
68 * Implementation of real commit. It also acts as an indication that
69 * the transaction is running -- which we flip atomically using
70 * {@link #IMPL_UPDATER}.
72 private volatile AbstractDOMForwardedTransactionFactory<?> commitImpl;
75 * Future task of transaction commit. It starts off as null, but is
76 * set appropriately on {@link #commit()} and {@link #cancel()} via
77 * {@link AtomicReferenceFieldUpdater#lazySet(Object, Object)}.
80 * Lazy set is safe for use because it is only referenced to in the
81 * {@link #cancel()} slow path, where we will busy-wait for it. The
82 * fast path gets the benefit of a store-store barrier instead of the
83 * usual store-load barrier.
85 private volatile Future<?> commitFuture;
87 protected DOMForwardedWriteTransaction(final Object identifier, final Map<LogicalDatastoreType, T> backingTxs,
88 final AbstractDOMForwardedTransactionFactory<?> commitImpl) {
89 super(identifier, backingTxs);
90 this.commitImpl = requireNonNull(commitImpl, "commitImpl must not be null.");
94 public void put(final LogicalDatastoreType store, final YangInstanceIdentifier path,
95 final NormalizedNode<?, ?> data) {
96 checkRunning(commitImpl);
97 getSubtransaction(store).write(path, data);
101 public void delete(final LogicalDatastoreType store, final YangInstanceIdentifier path) {
102 checkRunning(commitImpl);
103 getSubtransaction(store).delete(path);
107 public void merge(final LogicalDatastoreType store, final YangInstanceIdentifier path,
108 final NormalizedNode<?, ?> data) {
109 checkRunning(commitImpl);
110 getSubtransaction(store).merge(path, data);
114 public boolean cancel() {
115 final AbstractDOMForwardedTransactionFactory<?> impl = IMPL_UPDATER.getAndSet(this, null);
117 LOG.trace("Transaction {} cancelled before submit", getIdentifier());
118 FUTURE_UPDATER.lazySet(this, CANCELLED_FUTURE);
119 closeSubtransactions();
123 // The transaction is in process of being submitted or cancelled. Busy-wait
124 // for the corresponding future.
127 future = commitFuture;
128 } while (future == null);
130 return future.cancel(false);
134 public FluentFuture<? extends CommitInfo> commit() {
135 return FluentFuture.from(doCommit(CommitInfo::empty));
138 @SuppressWarnings("checkstyle:IllegalCatch")
139 private <V> ListenableFuture<V> doCommit(final Supplier<V> futureValueSupplier) {
140 final AbstractDOMForwardedTransactionFactory<?> impl = IMPL_UPDATER.getAndSet(this, null);
143 final Collection<T> txns = getSubtransactions();
144 final Collection<DOMStoreThreePhaseCommitCohort> cohorts = new ArrayList<>(txns.size());
146 ListenableFuture<V> ret;
148 for (DOMStoreWriteTransaction txn : txns) {
149 cohorts.add(txn.ready());
152 ret = impl.commit(this, cohorts, futureValueSupplier);
153 } catch (RuntimeException e) {
154 ret = FluentFuture.from(Futures.immediateFailedFuture(
155 TransactionCommitFailedExceptionMapper.COMMIT_ERROR_MAPPER.apply(e)));
157 FUTURE_UPDATER.lazySet(this, ret);
161 private void checkRunning(final AbstractDOMForwardedTransactionFactory<?> impl) {
162 checkState(impl != null, "Transaction %s is no longer running", getIdentifier());