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.Function;
15 import com.google.common.base.Optional;
16 import com.google.common.collect.ImmutableMap;
17 import com.google.common.collect.Lists;
18 import com.google.common.collect.Maps;
19 import com.google.common.util.concurrent.CheckedFuture;
20 import com.google.common.util.concurrent.FluentFuture;
21 import com.google.common.util.concurrent.FutureCallback;
22 import com.google.common.util.concurrent.Futures;
23 import com.google.common.util.concurrent.ListenableFuture;
24 import com.google.common.util.concurrent.MoreExecutors;
25 import com.google.common.util.concurrent.SettableFuture;
27 import java.util.Queue;
28 import javax.annotation.Nonnull;
29 import javax.annotation.concurrent.NotThreadSafe;
30 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
31 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
32 import org.opendaylight.controller.md.sal.dom.api.DOMDataReadOnlyTransaction;
33 import org.opendaylight.controller.md.sal.dom.api.DOMDataReadWriteTransaction;
34 import org.opendaylight.controller.md.sal.dom.api.DOMDataWriteTransaction;
35 import org.opendaylight.mdsal.common.api.CommitInfo;
36 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
37 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
38 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTree;
39 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeConfiguration;
40 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
41 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeSnapshot;
42 import org.opendaylight.yangtools.yang.data.impl.schema.tree.InMemoryDataTreeFactory;
43 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
46 * Read/write transaction that delegates write and initial read to
47 * {@link org.opendaylight.mdsal.dom.broker.ShardedDOMWriteTransactionAdapter}
48 * and {@link org.opendaylight.mdsal.dom.broker.ShardedDOMReadTransactionAdapter}
49 * respectively. These two in turn rely on shard aware implementation of
50 * {@link org.opendaylight.mdsal.dom.api.DOMDataTreeService}.
53 * Since reading data distributed on different subshards is not guaranteed to
54 * return all relevant data, best effort is to try to operate only on single
55 * subtree in conceptual data tree. We define this subtree by first write
56 * operation performed on transaction. All next read and write operations
57 * should be performed just in this initial subtree.
59 // FIXME explicitly enforce just one subtree requirement
61 class ShardedDOMDataBrokerDelegatingReadWriteTransaction implements DOMDataReadWriteTransaction {
62 private final DOMDataReadOnlyTransaction readTxDelegate;
63 private final DOMDataWriteTransaction writeTxDelegate;
64 private final Object txIdentifier;
65 private final ImmutableMap<LogicalDatastoreType, Queue<Modification>> modificationHistoryMap;
66 private final ImmutableMap<LogicalDatastoreType, DataTreeSnapshot> snapshotMap;
67 private final Map<LogicalDatastoreType, ListenableFuture<Optional<NormalizedNode<?, ?>>>> initialReadMap;
68 private YangInstanceIdentifier root = null;
70 ShardedDOMDataBrokerDelegatingReadWriteTransaction(final Object readWriteTxId, final SchemaContext ctx,
71 final DOMDataReadOnlyTransaction readTxDelegate,
72 final DOMDataWriteTransaction writeTxDelegate) {
73 this.readTxDelegate = checkNotNull(readTxDelegate);
74 this.writeTxDelegate = checkNotNull(writeTxDelegate);
75 this.txIdentifier = checkNotNull(readWriteTxId);
76 this.initialReadMap = Maps.newEnumMap(LogicalDatastoreType.class);
78 final InMemoryDataTreeFactory treeFactory = new InMemoryDataTreeFactory();
79 final ImmutableMap.Builder<LogicalDatastoreType, DataTreeSnapshot> snapshotMapBuilder = ImmutableMap.builder();
80 final ImmutableMap.Builder<LogicalDatastoreType, Queue<Modification>> modificationHistoryMapBuilder
81 = ImmutableMap.builder();
82 for (final LogicalDatastoreType store : LogicalDatastoreType.values()) {
83 final DataTree tree = treeFactory.create(treeConfigForStore(store));
84 tree.setSchemaContext(ctx);
85 snapshotMapBuilder.put(store, tree.takeSnapshot());
87 modificationHistoryMapBuilder.put(store, Lists.newLinkedList());
90 modificationHistoryMap = modificationHistoryMapBuilder.build();
91 snapshotMap = snapshotMapBuilder.build();
95 public boolean cancel() {
96 readTxDelegate.close();
97 return writeTxDelegate.cancel();
101 public void delete(final LogicalDatastoreType store, final YangInstanceIdentifier path) {
106 modificationHistoryMap.get(store).add(new Modification(Modification.Operation.DELETE, path, null));
107 writeTxDelegate.delete(store, path);
111 public FluentFuture<? extends CommitInfo> commit() {
112 return writeTxDelegate.commit();
116 public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read(final LogicalDatastoreType store,
117 final YangInstanceIdentifier path) {
118 checkState(root != null,
119 "A modify operation (put, merge or delete) must be performed prior to a read operation");
120 final SettableFuture<Optional<NormalizedNode<?, ?>>> readResult = SettableFuture.create();
121 final Queue<Modification> currentHistory = Lists.newLinkedList(modificationHistoryMap.get(store));
122 Futures.addCallback(initialReadMap.get(store), new FutureCallback<Optional<NormalizedNode<?, ?>>>() {
124 public void onSuccess(@Nonnull final Optional<NormalizedNode<?, ?>> result) {
125 final DataTreeModification mod = snapshotMap.get(store).newModification();
126 if (result.isPresent()) {
127 mod.write(path, result.get());
129 applyModificationHistoryToSnapshot(mod, currentHistory);
130 readResult.set(Optional.fromJavaUtil(mod.readNode(path)));
134 public void onFailure(final Throwable throwable) {
135 readResult.setException(throwable);
137 }, MoreExecutors.directExecutor());
139 return Futures.makeChecked(readResult, ReadFailedException.MAPPER);
143 public CheckedFuture<Boolean, ReadFailedException> exists(final LogicalDatastoreType store,
144 final YangInstanceIdentifier path) {
145 checkState(root != null,
146 "A modify operation (put, merge or delete) must be performed prior to an exists operation");
147 return Futures.makeChecked(Futures.transform(read(store, path),
148 (Function<Optional<NormalizedNode<?, ?>>, Boolean>)
149 Optional::isPresent),
150 ReadFailedException.MAPPER);
154 public void put(final LogicalDatastoreType store, final YangInstanceIdentifier path,
155 final NormalizedNode<?, ?> data) {
160 modificationHistoryMap.get(store).add(new Modification(Modification.Operation.WRITE, path, data));
161 writeTxDelegate.put(store, path, data);
165 public void merge(final LogicalDatastoreType store, final YangInstanceIdentifier path,
166 final NormalizedNode<?, ?> data) {
171 modificationHistoryMap.get(store).add(new Modification(Modification.Operation.MERGE, path, data));
172 writeTxDelegate.merge(store, path, data);
176 public Object getIdentifier() {
180 private void initialRead(final YangInstanceIdentifier path) {
183 for (final LogicalDatastoreType store : LogicalDatastoreType.values()) {
184 initialReadMap.put(store, readTxDelegate.read(store, path));
188 private static DataTreeConfiguration treeConfigForStore(final LogicalDatastoreType store) {
189 return store == LogicalDatastoreType.CONFIGURATION ? DataTreeConfiguration.DEFAULT_CONFIGURATION
190 : DataTreeConfiguration.DEFAULT_OPERATIONAL;
193 private static void applyModificationHistoryToSnapshot(final DataTreeModification dataTreeModification,
194 final Queue<Modification> modificationHistory) {
195 while (!modificationHistory.isEmpty()) {
196 final Modification modification = modificationHistory.poll();
197 switch (modification.getOperation()) {
199 dataTreeModification.write(modification.getPath(), modification.getData());
202 dataTreeModification.merge(modification.getPath(), modification.getData());
205 dataTreeModification.delete(modification.getPath());
213 static class Modification {
219 private final NormalizedNode<?, ?> data;
220 private final YangInstanceIdentifier path;
221 private final Operation operation;
223 Modification(final Operation operation, final YangInstanceIdentifier path, final NormalizedNode<?, ?> data) {
225 this.path = checkNotNull(path);
226 this.operation = checkNotNull(operation);
229 Operation getOperation() {
233 YangInstanceIdentifier getPath() {
237 NormalizedNode<?, ?> getData() {