2 * Copyright (c) 2015, 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.yangtools.yang.parser.stmt.reactor;
10 import static com.google.common.base.Preconditions.checkArgument;
11 import static com.google.common.base.Preconditions.checkState;
12 import static com.google.common.base.Verify.verifyNotNull;
13 import static java.util.Objects.requireNonNull;
14 import static org.opendaylight.yangtools.yang.parser.spi.meta.ModelProcessingPhase.EFFECTIVE_MODEL;
15 import static org.opendaylight.yangtools.yang.parser.spi.meta.ModelProcessingPhase.FULL_DECLARATION;
17 import com.google.common.base.MoreObjects;
18 import com.google.common.base.MoreObjects.ToStringHelper;
19 import java.util.ArrayList;
20 import java.util.HashSet;
21 import java.util.Iterator;
22 import java.util.List;
24 import java.util.function.Function;
25 import org.eclipse.jdt.annotation.NonNull;
26 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
27 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
28 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder;
29 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelProcessingPhase;
30 import org.opendaylight.yangtools.yang.parser.spi.meta.NamespaceKeyCriterion;
31 import org.opendaylight.yangtools.yang.parser.spi.meta.ParserNamespace;
32 import org.opendaylight.yangtools.yang.parser.spi.meta.StatementNamespace;
33 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
34 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext.Mutable;
35 import org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase.ContextMutation;
36 import org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase.OnNamespaceItemAdded;
37 import org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase.OnPhaseFinished;
38 import org.slf4j.Logger;
39 import org.slf4j.LoggerFactory;
41 final class ModifierImpl implements ModelActionBuilder {
42 private static final Logger LOG = LoggerFactory.getLogger(ModifierImpl.class);
44 private final Set<AbstractPrerequisite<?>> unsatisfied = new HashSet<>(1);
45 private final Set<AbstractPrerequisite<?>> mutations = new HashSet<>(1);
46 private final InferenceContext ctx = new InferenceContext() { };
48 private List<Runnable> bootstraps;
49 private InferenceAction action;
50 private boolean actionApplied;
52 private <D> AbstractPrerequisite<D> addReq(final AbstractPrerequisite<D> prereq) {
53 LOG.trace("Modifier {} adding prerequisite {}", this, prereq);
54 unsatisfied.add(prereq);
58 private <T> @NonNull AbstractPrerequisite<T> addMutation(final @NonNull AbstractPrerequisite<T> mutation) {
59 LOG.trace("Modifier {} adding mutation {}", this, mutation);
60 mutations.add(mutation);
64 private void checkNotRegistered() {
65 checkState(action == null, "Action was already registered.");
68 private boolean removeSatisfied() {
69 final Iterator<AbstractPrerequisite<?>> it = unsatisfied.iterator();
70 while (it.hasNext()) {
71 final AbstractPrerequisite<?> prereq = it.next();
72 if (prereq.isDone()) {
73 // We are removing current prerequisite from list.
74 LOG.trace("Modifier {} prerequisite {} satisfied", this, prereq);
78 return unsatisfied.isEmpty();
87 action.prerequisiteFailed(unsatisfied);
91 private <K, C extends StmtContext<?, ?, ?>> @NonNull AbstractPrerequisite<C> requiresCtxImpl(
92 final StmtContext<?, ?, ?> context, final StatementNamespace<K, ?, ?> namespace, final K key,
93 final ModelProcessingPhase phase) {
96 AddedToNamespace<C> addedToNs = new AddedToNamespace<>(phase);
98 contextImpl(context).onNamespaceItemAddedAction(namespace, key, addedToNs);
102 private <K, C extends StmtContext<?, ?, ?>> @NonNull AbstractPrerequisite<C> requiresCtxImpl(
103 final StmtContext<?, ?, ?> context, final StatementNamespace<K, ?, ?> namespace,
104 final NamespaceKeyCriterion<K> criterion, final ModelProcessingPhase phase) {
105 checkNotRegistered();
107 AddedToNamespace<C> addedToNs = new AddedToNamespace<>(phase);
109 contextImpl(context).onNamespaceItemAddedAction(namespace, phase, criterion, addedToNs);
113 private <C extends StmtContext<?, ?, ?>> @NonNull AbstractPrerequisite<C> requiresCtxImpl(final C context,
114 final ModelProcessingPhase phase) {
115 checkNotRegistered();
117 PhaseFinished<C> phaseFin = new PhaseFinished<>();
119 addBootstrap(() -> contextImpl(context).addPhaseCompletedListener(phase, phaseFin));
123 @SuppressWarnings({ "rawtypes", "unchecked" })
124 private <K, C extends Mutable<?, ?, ?>> AbstractPrerequisite<C> mutatesCtxImpl(final StmtContext<?, ?, ?> context,
125 final ParserNamespace<K, ? extends StmtContext<?, ?, ?>> namespace, final K key,
126 final ModelProcessingPhase phase) {
127 checkNotRegistered();
129 final PhaseModificationInNamespace<C> mod = new PhaseModificationInNamespace<>(EFFECTIVE_MODEL);
132 contextImpl(context).onNamespaceItemAddedAction((ParserNamespace) namespace, key, mod);
136 private static StatementContextBase<?, ?, ?> contextImpl(final Object value) {
137 checkArgument(value instanceof StatementContextBase, "Supplied context %s is not provided by this reactor.",
139 return StatementContextBase.class.cast(value);
143 checkState(action != null, "Action was not defined yet.");
145 if (removeSatisfied()) {
146 if (!actionApplied) {
148 actionApplied = true;
156 public <C extends Mutable<?, ?, ?>, T extends C> Prerequisite<C> mutatesCtx(final T context,
157 final ModelProcessingPhase phase) {
158 return addMutation(new PhaseMutation<>(contextImpl(context), phase));
162 public <A, D extends DeclaredStatement<A>, E extends EffectiveStatement<A, D>>
163 AbstractPrerequisite<StmtContext<A, D, E>> requiresCtx(final StmtContext<A, D, E> context,
164 final ModelProcessingPhase phase) {
165 return requiresCtxImpl(context, phase);
169 public <K> Prerequisite<StmtContext<?, ?, ?>> requiresCtx(final StmtContext<?, ?, ?> context,
170 final StatementNamespace<K, ?, ?> namespace, final K key, final ModelProcessingPhase phase) {
171 return requiresCtxImpl(context, namespace, key, phase);
175 public <K> Prerequisite<StmtContext<?, ?, ?>> requiresCtx(final StmtContext<?, ?, ?> context,
176 final StatementNamespace<K, ?, ?> namespace, final NamespaceKeyCriterion<K> criterion,
177 final ModelProcessingPhase phase) {
178 return requiresCtxImpl(context, namespace, criterion, phase);
182 public <K, E extends EffectiveStatement<?, ?>> Prerequisite<StmtContext<?, ?, E>> requiresCtxPath(
183 final StmtContext<?, ?, ?> context, final ParserNamespace<K, ? extends StmtContext<?, ?, ?>> namespace,
184 final Iterable<K> keys, final ModelProcessingPhase phase) {
185 checkNotRegistered();
187 final var ret = new PhaseRequirementInNamespacePath<StmtContext<?, ?, E>, K>(EFFECTIVE_MODEL, keys);
189 addBootstrap(() -> ret.hookOnto(context, namespace));
194 public <D extends DeclaredStatement<?>> Prerequisite<D> requiresDeclared(
195 final StmtContext<?, ? extends D, ?> context) {
196 return requiresCtxImpl(context, FULL_DECLARATION).transform(StmtContext::declared);
201 public <K, D extends DeclaredStatement<?>> Prerequisite<D> requiresDeclared(final StmtContext<?, ?, ?> context,
202 final StatementNamespace<K, ? extends D, ?> namespace, final K key) {
203 final AbstractPrerequisite<StmtContext<?, D, ?>> rawContext = requiresCtxImpl(context, namespace, key,
205 return rawContext.transform(StmtContext::declared);
210 public <K, D extends DeclaredStatement<?>> AbstractPrerequisite<StmtContext<?, D, ?>> requiresDeclaredCtx(
211 final StmtContext<?, ?, ?> context, final StatementNamespace<K, ? extends D, ?> namespace, final K key) {
212 return requiresCtxImpl(context, namespace, key, FULL_DECLARATION);
217 public <E extends EffectiveStatement<?, ?>> Prerequisite<E> requiresEffective(
218 final StmtContext<?, ?, ? extends E> stmt) {
219 return requiresCtxImpl(stmt, EFFECTIVE_MODEL).transform(StmtContext::buildEffective);
224 public <K, E extends EffectiveStatement<?, ?>> Prerequisite<E> requiresEffective(final StmtContext<?, ?, ?> context,
225 final StatementNamespace<K, ?, ? extends E> namespace, final K key) {
226 final AbstractPrerequisite<StmtContext<?, ?, E>> rawContext = requiresCtxImpl(context, namespace, key,
228 return rawContext.transform(StmtContext::buildEffective);
233 public <K, E extends EffectiveStatement<?, ?>> AbstractPrerequisite<StmtContext<?, ?, E>> requiresEffectiveCtx(
234 final StmtContext<?, ?, ?> context, final StatementNamespace<K, ?, ? extends E> namespace, final K key) {
235 return requiresCtxImpl(contextImpl(context), namespace, key, EFFECTIVE_MODEL);
240 public Prerequisite<Mutable<?, ?, ?>> mutatesNs(final Mutable<?, ?, ?> context,
241 final ParserNamespace<?, ?> namespace) {
242 return addMutation(new NamespaceMutation(contextImpl(context), namespace));
246 public <K, E extends EffectiveStatement<?, ?>> AbstractPrerequisite<Mutable<?, ?, E>> mutatesEffectiveCtx(
247 final StmtContext<?, ?, ?> context, final ParserNamespace<K, ? extends StmtContext<?, ?, ?>> namespace,
249 return mutatesCtxImpl(context, namespace, key, EFFECTIVE_MODEL);
253 public <K, E extends EffectiveStatement<?, ?>> AbstractPrerequisite<Mutable<?, ?, E>> mutatesEffectiveCtxPath(
254 final StmtContext<?, ?, ?> context, final ParserNamespace<K, ? extends StmtContext<?, ?, ?>> namespace,
255 final Iterable<K> keys) {
256 checkNotRegistered();
258 final var ret = new PhaseModificationInNamespacePath<Mutable<?, ?, E>, K>(EFFECTIVE_MODEL, keys);
261 addBootstrap(() -> ret.hookOnto(context, namespace));
266 @SuppressWarnings("checkstyle:hiddenField")
267 public void apply(final InferenceAction action) {
268 checkState(this.action == null, "Action already defined to %s", this.action);
269 this.action = requireNonNull(action);
270 if (bootstraps != null) {
271 bootstraps.forEach(Runnable::run);
276 private void addBootstrap(final Runnable bootstrap) {
277 if (bootstraps == null) {
278 bootstraps = new ArrayList<>(1);
280 bootstraps.add(bootstrap);
283 private abstract class AbstractPrerequisite<T> implements Prerequisite<T> {
284 private boolean done = false;
288 @SuppressWarnings("checkstyle:hiddenField")
289 public final T resolve(final InferenceContext ctx) {
291 checkArgument(ctx == ModifierImpl.this.ctx);
292 return verifyNotNull(value, "Attempted to access unavailable prerequisite %s", this);
295 final boolean isDone() {
299 @SuppressWarnings("checkstyle:hiddenField")
300 final boolean resolvePrereq(final T value) {
306 final <O> @NonNull Prerequisite<O> transform(final Function<? super T, O> transformation) {
307 return context -> transformation.apply(resolve(context));
311 public final String toString() {
312 return addToStringAttributes(MoreObjects.toStringHelper(this).omitNullValues()).toString();
315 ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
316 return toStringHelper.add("value", value);
320 private abstract class AbstractPathPrerequisite<C extends StmtContext<?, ?, ?>, K> extends AbstractPrerequisite<C>
321 implements OnNamespaceItemAdded {
322 private final ModelProcessingPhase modPhase;
323 private final Iterable<K> keys;
324 private final Iterator<K> it;
326 AbstractPathPrerequisite(final ModelProcessingPhase phase, final Iterable<K> keys) {
327 this.modPhase = requireNonNull(phase);
328 this.keys = requireNonNull(keys);
329 it = keys.iterator();
333 public final void namespaceItemAdded(final StatementContextBase<?, ?, ?> context,
334 final ParserNamespace<?, ?> namespace, final Object key, final Object value) {
335 LOG.debug("Action for {} got key {}", keys, key);
337 final StatementContextBase<?, ?, ?> target = contextImpl(value);
338 if (!target.isSupportedByFeatures()) {
339 LOG.debug("Key {} in {} is not supported", key, keys);
341 action.prerequisiteUnavailable(this);
345 nextStep(modPhase, context, target);
348 // Last step: we are done
349 if (resolvePrereq((C) value)) {
355 // Make sure target's storage notifies us when the next step becomes available.
356 hookOnto(target, namespace, it.next());
359 abstract void nextStep(ModelProcessingPhase phase, StatementContextBase<?, ?, ?> current,
360 StatementContextBase<?, ?, ?> next);
363 final ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
364 return super.addToStringAttributes(toStringHelper).add("phase", modPhase).add("keys", keys);
367 final void hookOnto(final StmtContext<?, ?, ?> context, final ParserNamespace<?, ?> namespace) {
368 checkArgument(it.hasNext(), "Namespace %s keys may not be empty", namespace);
369 hookOnto(contextImpl(context), namespace, it.next());
372 @SuppressWarnings("unchecked")
373 private void hookOnto(final StatementContextBase<?, ?, ?> context, final ParserNamespace<?, ?> namespace,
375 context.onNamespaceItemAddedAction((ParserNamespace) namespace, requireNonNull(key), this);
379 private final class PhaseMutation<C> extends AbstractPrerequisite<C> implements ContextMutation {
380 @SuppressWarnings("unchecked")
381 PhaseMutation(final StatementContextBase<?, ?, ?> context, final ModelProcessingPhase phase) {
382 context.addMutation(phase, this);
383 resolvePrereq((C) context);
387 public boolean isFinished() {
392 private final class PhaseFinished<C extends StmtContext<?, ?, ?>> extends AbstractPrerequisite<C>
393 implements OnPhaseFinished {
394 @SuppressWarnings("unchecked")
396 public boolean phaseFinished(final StatementContextBase<?, ?, ?> context,
397 final ModelProcessingPhase finishedPhase) {
398 return resolvePrereq((C) context) || tryApply();
402 private final class NamespaceMutation extends AbstractPrerequisite<Mutable<?, ?, ?>> {
403 NamespaceMutation(final StatementContextBase<?, ?, ?> ctx, final ParserNamespace<?, ?> namespace) {
408 private final class AddedToNamespace<C extends StmtContext<?, ?, ?>> extends AbstractPrerequisite<C>
409 implements OnNamespaceItemAdded, OnPhaseFinished {
410 private final ModelProcessingPhase phase;
412 AddedToNamespace(final ModelProcessingPhase phase) {
413 this.phase = requireNonNull(phase);
417 public void namespaceItemAdded(final StatementContextBase<?, ?, ?> context,
418 final ParserNamespace<?, ?> namespace, final Object key, final Object value) {
419 ((StatementContextBase<?, ?, ?>) value).addPhaseCompletedListener(phase, this);
422 @SuppressWarnings("unchecked")
424 public boolean phaseFinished(final StatementContextBase<?, ?, ?> context,
425 final ModelProcessingPhase finishedPhase) {
426 return resolvePrereq((C) context) || tryApply();
430 ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
431 return super.addToStringAttributes(toStringHelper).add("phase", phase);
435 private final class PhaseRequirementInNamespacePath<C extends StmtContext<?, ?, ?>, K>
436 extends AbstractPathPrerequisite<C, K> {
437 PhaseRequirementInNamespacePath(final ModelProcessingPhase phase, final Iterable<K> keys) {
442 void nextStep(final ModelProcessingPhase phase, final StatementContextBase<?, ?, ?> current,
443 final StatementContextBase<?, ?, ?> next) {
448 private final class PhaseModificationInNamespace<C extends Mutable<?, ?, ?>> extends AbstractPrerequisite<C>
449 implements OnNamespaceItemAdded, ContextMutation {
450 private final ModelProcessingPhase modPhase;
452 PhaseModificationInNamespace(final ModelProcessingPhase phase) {
453 checkArgument(phase != null, "Model processing phase must not be null");
454 this.modPhase = phase;
457 @SuppressWarnings("unchecked")
459 public void namespaceItemAdded(final StatementContextBase<?, ?, ?> context,
460 final ParserNamespace<?, ?> namespace, final Object key, final Object value) {
461 StatementContextBase<?, ?, ?> targetCtx = contextImpl(value);
462 targetCtx.addMutation(modPhase, this);
463 resolvePrereq((C) targetCtx);
467 public boolean isFinished() {
473 * This similar to {@link PhaseModificationInNamespace}, but allows recursive descent until it finds the real
474 * target. The mechanics is driven as a sequence of prerequisites along a path: first we hook onto namespace to
475 * give us the first step. When it does, we hook onto the first item to provide us the second step and so on.
477 private final class PhaseModificationInNamespacePath<C extends Mutable<?, ?, ?>, K>
478 extends AbstractPathPrerequisite<C, K> implements ContextMutation {
479 PhaseModificationInNamespacePath(final ModelProcessingPhase phase, final Iterable<K> keys) {
484 public boolean isFinished() {
489 void nextStep(final ModelProcessingPhase phase, final StatementContextBase<?, ?, ?> current,
490 final StatementContextBase<?, ?, ?> next) {
491 // Hook onto target: we either have a modification of the target itself or one of its children.
492 next.addMutation(phase, this);
493 // We have completed the context -> target step, hence we are no longer directly blocking context from
494 // making forward progress.
495 current.removeMutation(phase, this);