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.yangtools.yang.data.tree.impl;
10 import static com.google.common.base.Preconditions.checkArgument;
11 import static java.util.Objects.requireNonNull;
13 import com.google.common.base.MoreObjects.ToStringHelper;
14 import com.google.common.base.Verify;
15 import java.util.Collection;
16 import java.util.Optional;
17 import org.eclipse.jdt.annotation.NonNull;
18 import org.eclipse.jdt.annotation.Nullable;
19 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
20 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
21 import org.opendaylight.yangtools.yang.data.api.schema.DistinctNodeContainer;
22 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
23 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNodeContainer;
24 import org.opendaylight.yangtools.yang.data.api.schema.builder.NormalizedNodeContainerBuilder;
25 import org.opendaylight.yangtools.yang.data.tree.api.ConflictingModificationAppliedException;
26 import org.opendaylight.yangtools.yang.data.tree.api.DataTreeConfiguration;
27 import org.opendaylight.yangtools.yang.data.tree.api.DataValidationFailedException;
28 import org.opendaylight.yangtools.yang.data.tree.api.ModificationType;
29 import org.opendaylight.yangtools.yang.data.tree.api.ModifiedNodeDoesNotExistException;
30 import org.opendaylight.yangtools.yang.data.tree.api.TreeType;
31 import org.opendaylight.yangtools.yang.data.tree.impl.node.MutableTreeNode;
32 import org.opendaylight.yangtools.yang.data.tree.impl.node.TreeNode;
33 import org.opendaylight.yangtools.yang.data.tree.impl.node.Version;
34 import org.opendaylight.yangtools.yang.model.api.DocumentedNode.WithStatus;
36 abstract class AbstractNodeContainerModificationStrategy<T extends WithStatus>
37 extends SchemaAwareApplyOperation<T> {
38 abstract static class Invisible<T extends WithStatus> extends AbstractNodeContainerModificationStrategy<T> {
39 private final @NonNull SchemaAwareApplyOperation<T> entryStrategy;
41 Invisible(final NormalizedNodeContainerSupport<?, ?> support, final DataTreeConfiguration treeConfig,
42 final SchemaAwareApplyOperation<T> entryStrategy) {
43 super(support, treeConfig);
44 this.entryStrategy = requireNonNull(entryStrategy);
49 return entryStrategy.getSchema();
52 final @NonNull ModificationApplyOperation entryStrategy() {
57 ToStringHelper addToStringAttributes(final ToStringHelper helper) {
58 return super.addToStringAttributes(helper).add("entry", entryStrategy);
62 abstract static class Visible<T extends WithStatus> extends AbstractNodeContainerModificationStrategy<T> {
63 private final @NonNull T schema;
65 Visible(final NormalizedNodeContainerSupport<?, ?> support, final DataTreeConfiguration treeConfig,
67 super(support, treeConfig);
68 this.schema = requireNonNull(schema);
77 ToStringHelper addToStringAttributes(final ToStringHelper helper) {
78 return super.addToStringAttributes(helper).add("schema", schema);
83 * Fake TreeNode version used in
84 * {@link #checkTouchApplicable(ModificationPath, NodeModification, Optional, Version)}
85 * It is okay to use a global constant, as the delegate will ignore it anyway.
87 private static final Version FAKE_VERSION = Version.initial();
89 private final NormalizedNodeContainerSupport<?, ?> support;
90 private final boolean verifyChildrenStructure;
92 AbstractNodeContainerModificationStrategy(final NormalizedNodeContainerSupport<?, ?> support,
93 final DataTreeConfiguration treeConfig) {
94 this.support = requireNonNull(support);
95 this.verifyChildrenStructure = treeConfig.getTreeType() == TreeType.CONFIGURATION;
99 protected final ChildTrackingPolicy getChildPolicy() {
100 return support.childPolicy;
104 final void verifyValue(final NormalizedNode writtenValue) {
105 final Class<?> nodeClass = support.requiredClass;
106 checkArgument(nodeClass.isInstance(writtenValue), "Node %s is not of type %s", writtenValue, nodeClass);
107 checkArgument(writtenValue instanceof NormalizedNodeContainer);
111 final void verifyValueChildren(final NormalizedNode writtenValue) {
112 if (verifyChildrenStructure) {
113 final DistinctNodeContainer<?, ?> container = (DistinctNodeContainer<?, ?>) writtenValue;
114 for (final NormalizedNode child : container.body()) {
115 final ModificationApplyOperation childOp = childByArg(child.getIdentifier());
116 if (childOp == null) {
117 throw new SchemaValidationFailedException(String.format(
118 "Node %s is not a valid child of %s according to the schema.",
119 child.getIdentifier(), container.getIdentifier()));
121 childOp.fullVerifyStructure(child);
124 optionalVerifyValueChildren(writtenValue);
126 mandatoryVerifyValueChildren(writtenValue);
130 * Perform additional verification on written value's child structure, like presence of mandatory children and
131 * exclusion. The default implementation does nothing and is not invoked for non-CONFIG data trees.
133 * @param writtenValue Effective written value
135 void optionalVerifyValueChildren(final NormalizedNode writtenValue) {
140 * Perform additional verification on written value's child structure, like presence of mandatory children.
141 * The default implementation does nothing.
143 * @param writtenValue Effective written value
145 void mandatoryVerifyValueChildren(final NormalizedNode writtenValue) {
150 protected final void recursivelyVerifyStructure(final NormalizedNode value) {
151 final NormalizedNodeContainer<?> container = (NormalizedNodeContainer<?>) value;
152 for (final NormalizedNode child : container.body()) {
153 final ModificationApplyOperation childOp = childByArg(child.getIdentifier());
154 if (childOp == null) {
155 throw new SchemaValidationFailedException(
156 String.format("Node %s is not a valid child of %s according to the schema.",
157 child.getIdentifier(), container.getIdentifier()));
160 childOp.recursivelyVerifyStructure(child);
165 protected TreeNode applyWrite(final ModifiedNode modification, final NormalizedNode newValue,
166 final Optional<? extends TreeNode> currentMeta, final Version version) {
167 final TreeNode newValueMeta = TreeNode.of(newValue, version);
169 if (modification.getChildren().isEmpty()) {
174 * This is where things get interesting. The user has performed a write and then she applied some more
175 * modifications to it. So we need to make sense of that and apply the operations on top of the written value.
177 * We could have done it during the write, but this operation is potentially expensive, so we have left it out
180 * As it turns out, once we materialize the written data, we can share the code path with the subtree change. So
181 * let's create an unsealed TreeNode and run the common parts on it -- which end with the node being sealed.
183 * FIXME: this code needs to be moved out from the prepare() path and into the read() and seal() paths. Merging
184 * of writes needs to be charged to the code which originated this, not to the code which is attempting
185 * to make it visible.
187 final MutableTreeNode mutable = newValueMeta.mutable();
188 mutable.setSubtreeVersion(version);
190 @SuppressWarnings("rawtypes")
191 final NormalizedNodeContainerBuilder dataBuilder = support.createBuilder(newValue);
192 final TreeNode result = mutateChildren(mutable, dataBuilder, version, modification.getChildren());
194 // We are good to go except one detail: this is a single logical write, but
195 // we have a result TreeNode which has been forced to materialized, e.g. it
196 // is larger than it needs to be. Create a new TreeNode to host the data.
197 return TreeNode.of(result.getData(), version);
201 * Applies write/remove diff operation for each modification child in modification subtree.
202 * Operation also sets the Data tree references for each Tree Node (Index Node) in meta (MutableTreeNode) structure.
204 * @param meta MutableTreeNode (IndexTreeNode)
205 * @param data DataBuilder
206 * @param nodeVersion Version of TreeNode
207 * @param modifications modification operations to apply
208 * @return Sealed immutable copy of TreeNode structure with all Data Node references set.
210 @SuppressWarnings({ "rawtypes", "unchecked" })
211 private TreeNode mutateChildren(final MutableTreeNode meta, final NormalizedNodeContainerBuilder data,
212 final Version nodeVersion, final Iterable<ModifiedNode> modifications) {
214 for (final ModifiedNode mod : modifications) {
215 final PathArgument id = mod.getIdentifier();
216 final Optional<? extends TreeNode> cm = meta.findChildByArg(id);
218 final Optional<? extends TreeNode> result = resolveChildOperation(id).apply(mod, cm, nodeVersion);
219 if (result.isPresent()) {
220 final TreeNode tn = result.get();
222 data.addChild(tn.getData());
224 meta.removeChild(id);
225 data.removeChild(id);
229 meta.setData(data.build());
234 protected TreeNode applyMerge(final ModifiedNode modification, final TreeNode currentMeta, final Version version) {
236 * The node which we are merging exists. We now need to expand any child operations implied by the value. Once
237 * we do that, ModifiedNode children will look like this node were a TOUCH and we will let applyTouch() do the
238 * heavy lifting of applying the children recursively (either through here or through applyWrite().
240 final NormalizedNode value = modification.getWrittenValue();
242 Verify.verify(value instanceof DistinctNodeContainer, "Attempted to merge non-container %s", value);
243 for (final NormalizedNode c : ((DistinctNodeContainer<?, ?>) value).body()) {
244 final PathArgument id = c.getIdentifier();
245 modification.modifyChild(id, resolveChildOperation(id), version);
247 return applyTouch(modification, currentMeta, version);
250 private void mergeChildrenIntoModification(final ModifiedNode modification,
251 final Collection<? extends NormalizedNode> children, final Version version) {
252 for (final NormalizedNode c : children) {
253 final ModificationApplyOperation childOp = resolveChildOperation(c.getIdentifier());
254 final ModifiedNode childNode = modification.modifyChild(c.getIdentifier(), childOp, version);
255 childOp.mergeIntoModifiedNode(childNode, c, version);
260 final void mergeIntoModifiedNode(final ModifiedNode modification, final NormalizedNode value,
261 final Version version) {
262 final Collection<? extends NormalizedNode> children = ((DistinctNodeContainer<?, ?>)value).body();
263 switch (modification.getOperation()) {
265 // Fresh node, just record a MERGE with a value
266 recursivelyVerifyStructure(value);
267 modification.updateValue(LogicalOperation.MERGE, value);
271 mergeChildrenIntoModification(modification, children, version);
272 // We record empty merge value, since real children merges are already expanded. This is needed to
273 // satisfy non-null for merge original merge value can not be used since it mean different order of
274 // operation - parent changes are always resolved before children ones, and having node in TOUCH means
275 // children was modified before.
276 modification.updateValue(LogicalOperation.MERGE, support.createEmptyValue(value));
279 // Merging into an existing node. Merge data children modifications (maybe recursively) and mark
280 // as MERGE, invalidating cached snapshot
281 mergeChildrenIntoModification(modification, children, version);
282 modification.updateOperationType(LogicalOperation.MERGE);
285 // Delete performs a data dependency check on existence of the node. Performing a merge on DELETE means
286 // we are really performing a write. One thing that ruins that are any child modifications. If there
287 // are any, we will perform a read() to get the current state of affairs, turn this into into a WRITE
288 // and then append any child entries.
289 if (!modification.getChildren().isEmpty()) {
290 // Version does not matter here as we'll throw it out
291 final Optional<? extends TreeNode> current = apply(modification, modification.getOriginal(),
293 if (current.isPresent()) {
294 modification.updateValue(LogicalOperation.WRITE, current.get().getData());
295 mergeChildrenIntoModification(modification, children, version);
300 modification.updateValue(LogicalOperation.WRITE, value);
303 // We are augmenting a previous write. We'll just walk value's children, get the corresponding
304 // ModifiedNode and run recursively on it
305 mergeChildrenIntoModification(modification, children, version);
306 modification.updateOperationType(LogicalOperation.WRITE);
309 throw new IllegalArgumentException("Unsupported operation " + modification.getOperation());
314 protected TreeNode applyTouch(final ModifiedNode modification, final TreeNode currentMeta, final Version version) {
316 * The user may have issued an empty merge operation. In this case we:
317 * - do not perform a data tree mutation
318 * - do not pass GO, and
319 * - do not collect useless garbage.
320 * It also means the ModificationType is UNMODIFIED.
322 final Collection<ModifiedNode> children = modification.getChildren();
323 if (!children.isEmpty()) {
324 @SuppressWarnings("rawtypes")
325 final NormalizedNodeContainerBuilder dataBuilder = support.createBuilder(currentMeta.getData());
326 final MutableTreeNode newMeta = currentMeta.mutable();
327 newMeta.setSubtreeVersion(version);
328 final TreeNode ret = mutateChildren(newMeta, dataBuilder, version, children);
331 * It is possible that the only modifications under this node were empty merges, which were turned into
332 * UNMODIFIED. If that is the case, we can turn this operation into UNMODIFIED, too, potentially cascading
333 * it up to root. This has the benefit of speeding up any users, who can skip processing child nodes.
335 * In order to do that, though, we have to check all child operations are UNMODIFIED.
337 * Let's do precisely that, stopping as soon we find a different result.
339 for (final ModifiedNode child : children) {
340 if (child.getModificationType() != ModificationType.UNMODIFIED) {
341 modification.resolveModificationType(ModificationType.SUBTREE_MODIFIED);
347 // The merge operation did not have any children, or all of them turned out to be UNMODIFIED, hence do not
348 // replace the metadata node.
349 modification.resolveModificationType(ModificationType.UNMODIFIED);
354 protected final void checkTouchApplicable(final ModificationPath path, final NodeModification modification,
355 final Optional<? extends TreeNode> current, final Version version) throws DataValidationFailedException {
356 final TreeNode currentNode;
357 if (!current.isPresent()) {
358 currentNode = defaultTreeNode();
359 if (currentNode == null) {
360 if (!modification.getOriginal().isPresent()) {
361 final YangInstanceIdentifier id = path.toInstanceIdentifier();
362 throw new ModifiedNodeDoesNotExistException(id,
363 String.format("Node %s does not exist. Cannot apply modification to its children.", id));
366 throw new ConflictingModificationAppliedException(path.toInstanceIdentifier(),
367 "Node was deleted by other transaction.");
370 currentNode = current.get();
373 checkChildPreconditions(path, modification, currentNode, version);
377 * Return the default tree node. Default implementation does nothing, but can be overridden to call
378 * {@link #defaultTreeNode(NormalizedNode)}.
380 * @return Default empty tree node, or null if no default is available
382 @Nullable TreeNode defaultTreeNode() {
383 // Defaults to no recovery
387 static final TreeNode defaultTreeNode(final NormalizedNode emptyNode) {
388 return TreeNode.of(emptyNode, FAKE_VERSION);
392 protected final void checkMergeApplicable(final ModificationPath path, final NodeModification modification,
393 final Optional<? extends TreeNode> current, final Version version) throws DataValidationFailedException {
394 if (current.isPresent()) {
395 checkChildPreconditions(path, modification, current.get(), version);
400 * Recursively check child preconditions.
402 * @param path current node path
403 * @param modification current modification
404 * @param current Current data tree node.
406 private void checkChildPreconditions(final ModificationPath path, final NodeModification modification,
407 final TreeNode current, final Version version) throws DataValidationFailedException {
408 for (final NodeModification childMod : modification.getChildren()) {
409 final PathArgument childId = childMod.getIdentifier();
410 final Optional<? extends TreeNode> childMeta = current.findChildByArg(childId);
414 resolveChildOperation(childId).checkApplicable(path, childMod, childMeta, version);
422 ToStringHelper addToStringAttributes(final ToStringHelper helper) {
423 return helper.add("support", support).add("verifyChildren", verifyChildrenStructure);