2 * Copyright (c) 2016 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
9 package org.opendaylight.controller.md.sal.dom.broker.impl.legacy.sharded.adapter;
11 import static com.google.common.base.Preconditions.checkNotNull;
12 import static com.google.common.base.Preconditions.checkState;
14 import com.google.common.base.Optional;
15 import com.google.common.collect.ImmutableMap;
16 import com.google.common.collect.Lists;
17 import com.google.common.collect.Maps;
18 import com.google.common.util.concurrent.CheckedFuture;
19 import com.google.common.util.concurrent.FluentFuture;
20 import com.google.common.util.concurrent.FutureCallback;
21 import com.google.common.util.concurrent.Futures;
22 import com.google.common.util.concurrent.ListenableFuture;
23 import com.google.common.util.concurrent.MoreExecutors;
24 import com.google.common.util.concurrent.SettableFuture;
26 import java.util.Queue;
27 import javax.annotation.Nonnull;
28 import javax.annotation.concurrent.NotThreadSafe;
29 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
30 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
31 import org.opendaylight.controller.md.sal.dom.api.DOMDataReadOnlyTransaction;
32 import org.opendaylight.controller.md.sal.dom.api.DOMDataReadWriteTransaction;
33 import org.opendaylight.controller.md.sal.dom.api.DOMDataWriteTransaction;
34 import org.opendaylight.mdsal.common.api.CommitInfo;
35 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
36 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
37 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTree;
38 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeConfiguration;
39 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
40 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeSnapshot;
41 import org.opendaylight.yangtools.yang.data.impl.schema.tree.InMemoryDataTreeFactory;
42 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
45 * Read/write transaction that delegates write and initial read to
46 * {@link org.opendaylight.mdsal.dom.broker.ShardedDOMWriteTransactionAdapter}
47 * and {@link org.opendaylight.mdsal.dom.broker.ShardedDOMReadTransactionAdapter}
48 * respectively. These two in turn rely on shard aware implementation of
49 * {@link org.opendaylight.mdsal.dom.api.DOMDataTreeService}.
52 * Since reading data distributed on different subshards is not guaranteed to
53 * return all relevant data, best effort is to try to operate only on single
54 * subtree in conceptual data tree. We define this subtree by first write
55 * operation performed on transaction. All next read and write operations
56 * should be performed just in this initial subtree.
58 // FIXME explicitly enforce just one subtree requirement
60 class ShardedDOMDataBrokerDelegatingReadWriteTransaction implements DOMDataReadWriteTransaction {
61 private final DOMDataReadOnlyTransaction readTxDelegate;
62 private final DOMDataWriteTransaction writeTxDelegate;
63 private final Object txIdentifier;
64 private final ImmutableMap<LogicalDatastoreType, Queue<Modification>> modificationHistoryMap;
65 private final ImmutableMap<LogicalDatastoreType, DataTreeSnapshot> snapshotMap;
66 private final Map<LogicalDatastoreType, ListenableFuture<Optional<NormalizedNode<?, ?>>>> initialReadMap;
67 private YangInstanceIdentifier root = null;
69 ShardedDOMDataBrokerDelegatingReadWriteTransaction(final Object readWriteTxId, final SchemaContext ctx,
70 final DOMDataReadOnlyTransaction readTxDelegate,
71 final DOMDataWriteTransaction writeTxDelegate) {
72 this.readTxDelegate = checkNotNull(readTxDelegate);
73 this.writeTxDelegate = checkNotNull(writeTxDelegate);
74 this.txIdentifier = checkNotNull(readWriteTxId);
75 this.initialReadMap = Maps.newEnumMap(LogicalDatastoreType.class);
77 final InMemoryDataTreeFactory treeFactory = new InMemoryDataTreeFactory();
78 final ImmutableMap.Builder<LogicalDatastoreType, DataTreeSnapshot> snapshotMapBuilder = ImmutableMap.builder();
79 final ImmutableMap.Builder<LogicalDatastoreType, Queue<Modification>> modificationHistoryMapBuilder
80 = ImmutableMap.builder();
81 for (final LogicalDatastoreType store : LogicalDatastoreType.values()) {
82 final DataTree tree = treeFactory.create(treeConfigForStore(store));
83 tree.setSchemaContext(ctx);
84 snapshotMapBuilder.put(store, tree.takeSnapshot());
86 modificationHistoryMapBuilder.put(store, Lists.newLinkedList());
89 modificationHistoryMap = modificationHistoryMapBuilder.build();
90 snapshotMap = snapshotMapBuilder.build();
94 public boolean cancel() {
95 readTxDelegate.close();
96 return writeTxDelegate.cancel();
100 public void delete(final LogicalDatastoreType store, final YangInstanceIdentifier path) {
105 modificationHistoryMap.get(store).add(new Modification(Modification.Operation.DELETE, path, null));
106 writeTxDelegate.delete(store, path);
110 public FluentFuture<? extends CommitInfo> commit() {
111 return writeTxDelegate.commit();
115 public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read(final LogicalDatastoreType store,
116 final YangInstanceIdentifier path) {
117 checkState(root != null,
118 "A modify operation (put, merge or delete) must be performed prior to a read operation");
119 final SettableFuture<Optional<NormalizedNode<?, ?>>> readResult = SettableFuture.create();
120 final Queue<Modification> currentHistory = Lists.newLinkedList(modificationHistoryMap.get(store));
121 Futures.addCallback(initialReadMap.get(store), new FutureCallback<Optional<NormalizedNode<?, ?>>>() {
123 public void onSuccess(@Nonnull final Optional<NormalizedNode<?, ?>> result) {
124 final DataTreeModification mod = snapshotMap.get(store).newModification();
125 if (result.isPresent()) {
126 mod.write(path, result.get());
128 applyModificationHistoryToSnapshot(mod, currentHistory);
129 readResult.set(Optional.fromJavaUtil(mod.readNode(path)));
133 public void onFailure(final Throwable throwable) {
134 readResult.setException(throwable);
136 }, MoreExecutors.directExecutor());
138 return Futures.makeChecked(readResult, ReadFailedException.MAPPER);
142 public CheckedFuture<Boolean, ReadFailedException> exists(final LogicalDatastoreType store,
143 final YangInstanceIdentifier path) {
144 checkState(root != null,
145 "A modify operation (put, merge or delete) must be performed prior to an exists operation");
146 return Futures.makeChecked(Futures.transform(read(store, path), Optional::isPresent,
147 MoreExecutors.directExecutor()), ReadFailedException.MAPPER);
151 public void put(final LogicalDatastoreType store, final YangInstanceIdentifier path,
152 final NormalizedNode<?, ?> data) {
157 modificationHistoryMap.get(store).add(new Modification(Modification.Operation.WRITE, path, data));
158 writeTxDelegate.put(store, path, data);
162 public void merge(final LogicalDatastoreType store, final YangInstanceIdentifier path,
163 final NormalizedNode<?, ?> data) {
168 modificationHistoryMap.get(store).add(new Modification(Modification.Operation.MERGE, path, data));
169 writeTxDelegate.merge(store, path, data);
173 public Object getIdentifier() {
177 private void initialRead(final YangInstanceIdentifier path) {
180 for (final LogicalDatastoreType store : LogicalDatastoreType.values()) {
181 initialReadMap.put(store, readTxDelegate.read(store, path));
185 private static DataTreeConfiguration treeConfigForStore(final LogicalDatastoreType store) {
186 return store == LogicalDatastoreType.CONFIGURATION ? DataTreeConfiguration.DEFAULT_CONFIGURATION
187 : DataTreeConfiguration.DEFAULT_OPERATIONAL;
190 private static void applyModificationHistoryToSnapshot(final DataTreeModification dataTreeModification,
191 final Queue<Modification> modificationHistory) {
192 while (!modificationHistory.isEmpty()) {
193 final Modification modification = modificationHistory.poll();
194 switch (modification.getOperation()) {
196 dataTreeModification.write(modification.getPath(), modification.getData());
199 dataTreeModification.merge(modification.getPath(), modification.getData());
202 dataTreeModification.delete(modification.getPath());
210 static class Modification {
216 private final NormalizedNode<?, ?> data;
217 private final YangInstanceIdentifier path;
218 private final Operation operation;
220 Modification(final Operation operation, final YangInstanceIdentifier path, final NormalizedNode<?, ?> data) {
222 this.path = checkNotNull(path);
223 this.operation = checkNotNull(operation);
226 Operation getOperation() {
230 YangInstanceIdentifier getPath() {
234 NormalizedNode<?, ?> getData() {