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
8 package org.opendaylight.controller.md.sal.dom.broker.impl.legacy.sharded.adapter;
10 import static com.google.common.base.Preconditions.checkState;
11 import static java.util.Objects.requireNonNull;
13 import com.google.common.base.Optional;
14 import com.google.common.collect.ImmutableMap;
15 import com.google.common.collect.Lists;
16 import com.google.common.collect.Maps;
17 import com.google.common.util.concurrent.CheckedFuture;
18 import com.google.common.util.concurrent.FluentFuture;
19 import com.google.common.util.concurrent.FutureCallback;
20 import com.google.common.util.concurrent.Futures;
21 import com.google.common.util.concurrent.ListenableFuture;
22 import com.google.common.util.concurrent.MoreExecutors;
23 import com.google.common.util.concurrent.SettableFuture;
25 import java.util.Queue;
26 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
27 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
28 import org.opendaylight.controller.md.sal.dom.api.DOMDataReadOnlyTransaction;
29 import org.opendaylight.controller.md.sal.dom.api.DOMDataReadWriteTransaction;
30 import org.opendaylight.controller.md.sal.dom.api.DOMDataWriteTransaction;
31 import org.opendaylight.mdsal.common.api.CommitInfo;
32 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
33 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
34 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTree;
35 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeConfiguration;
36 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
37 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeSnapshot;
38 import org.opendaylight.yangtools.yang.data.impl.schema.tree.InMemoryDataTreeFactory;
39 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
42 * Read/write transaction that delegates write and initial read to
43 * {@link org.opendaylight.mdsal.dom.broker.ShardedDOMWriteTransactionAdapter}
44 * and {@link org.opendaylight.mdsal.dom.broker.ShardedDOMReadTransactionAdapter}
45 * respectively. These two in turn rely on shard aware implementation of
46 * {@link org.opendaylight.mdsal.dom.api.DOMDataTreeService}.
49 * Since reading data distributed on different subshards is not guaranteed to
50 * return all relevant data, best effort is to try to operate only on single
51 * subtree in conceptual data tree. We define this subtree by first write
52 * operation performed on transaction. All next read and write operations
53 * should be performed just in this initial subtree.
56 // FIXME explicitly enforce just one subtree requirement
58 class ShardedDOMDataBrokerDelegatingReadWriteTransaction implements DOMDataReadWriteTransaction {
59 private final DOMDataReadOnlyTransaction readTxDelegate;
60 private final DOMDataWriteTransaction writeTxDelegate;
61 private final Object txIdentifier;
62 private final ImmutableMap<LogicalDatastoreType, Queue<Modification>> modificationHistoryMap;
63 private final ImmutableMap<LogicalDatastoreType, DataTreeSnapshot> snapshotMap;
64 private final Map<LogicalDatastoreType, ListenableFuture<Optional<NormalizedNode<?, ?>>>> initialReadMap;
65 private YangInstanceIdentifier root = null;
67 ShardedDOMDataBrokerDelegatingReadWriteTransaction(final Object readWriteTxId, final SchemaContext ctx,
68 final DOMDataReadOnlyTransaction readTxDelegate,
69 final DOMDataWriteTransaction writeTxDelegate) {
70 this.readTxDelegate = requireNonNull(readTxDelegate);
71 this.writeTxDelegate = requireNonNull(writeTxDelegate);
72 this.txIdentifier = requireNonNull(readWriteTxId);
73 this.initialReadMap = Maps.newEnumMap(LogicalDatastoreType.class);
75 final InMemoryDataTreeFactory treeFactory = new InMemoryDataTreeFactory();
76 final ImmutableMap.Builder<LogicalDatastoreType, DataTreeSnapshot> snapshotMapBuilder = ImmutableMap.builder();
77 final ImmutableMap.Builder<LogicalDatastoreType, Queue<Modification>> modificationHistoryMapBuilder
78 = ImmutableMap.builder();
79 for (final LogicalDatastoreType store : LogicalDatastoreType.values()) {
80 final DataTree tree = treeFactory.create(treeConfigForStore(store));
81 tree.setSchemaContext(ctx);
82 snapshotMapBuilder.put(store, tree.takeSnapshot());
84 modificationHistoryMapBuilder.put(store, Lists.newLinkedList());
87 modificationHistoryMap = modificationHistoryMapBuilder.build();
88 snapshotMap = snapshotMapBuilder.build();
92 public boolean cancel() {
93 readTxDelegate.close();
94 return writeTxDelegate.cancel();
98 public void delete(final LogicalDatastoreType store, final YangInstanceIdentifier path) {
103 modificationHistoryMap.get(store).add(new Modification(Modification.Operation.DELETE, path, null));
104 writeTxDelegate.delete(store, path);
108 public FluentFuture<? extends CommitInfo> commit() {
109 return writeTxDelegate.commit();
113 public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read(final LogicalDatastoreType store,
114 final YangInstanceIdentifier path) {
115 checkState(root != null,
116 "A modify operation (put, merge or delete) must be performed prior to a read operation");
117 final SettableFuture<Optional<NormalizedNode<?, ?>>> readResult = SettableFuture.create();
118 final Queue<Modification> currentHistory = Lists.newLinkedList(modificationHistoryMap.get(store));
119 Futures.addCallback(initialReadMap.get(store), new FutureCallback<Optional<NormalizedNode<?, ?>>>() {
121 public void onSuccess(final Optional<NormalizedNode<?, ?>> result) {
122 final DataTreeModification mod = snapshotMap.get(store).newModification();
123 if (result.isPresent()) {
124 mod.write(path, result.get());
126 applyModificationHistoryToSnapshot(mod, currentHistory);
127 readResult.set(Optional.fromJavaUtil(mod.readNode(path)));
131 public void onFailure(final Throwable throwable) {
132 readResult.setException(throwable);
134 }, MoreExecutors.directExecutor());
136 return Futures.makeChecked(readResult, ReadFailedException.MAPPER);
140 public CheckedFuture<Boolean, ReadFailedException> exists(final LogicalDatastoreType store,
141 final YangInstanceIdentifier path) {
142 checkState(root != null,
143 "A modify operation (put, merge or delete) must be performed prior to an exists operation");
144 return Futures.makeChecked(Futures.transform(read(store, path), Optional::isPresent,
145 MoreExecutors.directExecutor()), ReadFailedException.MAPPER);
149 public void put(final LogicalDatastoreType store, final YangInstanceIdentifier path,
150 final NormalizedNode<?, ?> data) {
155 modificationHistoryMap.get(store).add(new Modification(Modification.Operation.WRITE, path, data));
156 writeTxDelegate.put(store, path, data);
160 public void merge(final LogicalDatastoreType store, final YangInstanceIdentifier path,
161 final NormalizedNode<?, ?> data) {
166 modificationHistoryMap.get(store).add(new Modification(Modification.Operation.MERGE, path, data));
167 writeTxDelegate.merge(store, path, data);
171 public Object getIdentifier() {
175 private void initialRead(final YangInstanceIdentifier path) {
178 for (final LogicalDatastoreType store : LogicalDatastoreType.values()) {
179 initialReadMap.put(store, readTxDelegate.read(store, path));
183 private static DataTreeConfiguration treeConfigForStore(final LogicalDatastoreType store) {
184 return store == LogicalDatastoreType.CONFIGURATION ? DataTreeConfiguration.DEFAULT_CONFIGURATION
185 : DataTreeConfiguration.DEFAULT_OPERATIONAL;
188 private static void applyModificationHistoryToSnapshot(final DataTreeModification dataTreeModification,
189 final Queue<Modification> modificationHistory) {
190 while (!modificationHistory.isEmpty()) {
191 final Modification modification = modificationHistory.poll();
192 switch (modification.getOperation()) {
194 dataTreeModification.write(modification.getPath(), modification.getData());
197 dataTreeModification.merge(modification.getPath(), modification.getData());
200 dataTreeModification.delete(modification.getPath());
208 static class Modification {
214 private final NormalizedNode<?, ?> data;
215 private final YangInstanceIdentifier path;
216 private final Operation operation;
218 Modification(final Operation operation, final YangInstanceIdentifier path, final NormalizedNode<?, ?> data) {
220 this.path = requireNonNull(path);
221 this.operation = requireNonNull(operation);
224 Operation getOperation() {
228 YangInstanceIdentifier getPath() {
232 NormalizedNode<?, ?> getData() {