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.StmtContext;
33 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext.Mutable;
34 import org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase.ContextMutation;
35 import org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase.OnNamespaceItemAdded;
36 import org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase.OnPhaseFinished;
37 import org.slf4j.Logger;
38 import org.slf4j.LoggerFactory;
40 final class ModifierImpl implements ModelActionBuilder {
41 private static final Logger LOG = LoggerFactory.getLogger(ModifierImpl.class);
43 private final Set<AbstractPrerequisite<?>> unsatisfied = new HashSet<>(1);
44 private final Set<AbstractPrerequisite<?>> mutations = new HashSet<>(1);
45 private final InferenceContext ctx = new InferenceContext() { };
47 private List<Runnable> bootstraps;
48 private InferenceAction action;
49 private boolean actionApplied;
51 private <D> AbstractPrerequisite<D> addReq(final AbstractPrerequisite<D> prereq) {
52 LOG.trace("Modifier {} adding prerequisite {}", this, prereq);
53 unsatisfied.add(prereq);
57 private <T> @NonNull AbstractPrerequisite<T> addMutation(final @NonNull AbstractPrerequisite<T> mutation) {
58 LOG.trace("Modifier {} adding mutation {}", this, mutation);
59 mutations.add(mutation);
63 private void checkNotRegistered() {
64 checkState(action == null, "Action was already registered.");
67 private boolean removeSatisfied() {
68 final Iterator<AbstractPrerequisite<?>> it = unsatisfied.iterator();
69 while (it.hasNext()) {
70 final AbstractPrerequisite<?> prereq = it.next();
71 if (prereq.isDone()) {
72 // We are removing current prerequisite from list.
73 LOG.trace("Modifier {} prerequisite {} satisfied", this, prereq);
77 return unsatisfied.isEmpty();
86 action.prerequisiteFailed(unsatisfied);
90 private <K, C extends StmtContext<?, ?, ?>> @NonNull AbstractPrerequisite<C> requiresCtxImpl(
91 final StmtContext<?, ?, ?> context, final ParserNamespace<K, C> namespace, final K key,
92 final ModelProcessingPhase phase) {
95 final var addedToNs = new AddedToNamespace<C>(this, phase);
97 contextImpl(context).onNamespaceItemAddedAction(namespace, key, addedToNs);
101 private <K, C extends StmtContext<?, ?, ?>> @NonNull AbstractPrerequisite<C> requiresCtxImpl(
102 final StmtContext<?, ?, ?> context, final ParserNamespace<K, C> namespace,
103 final NamespaceKeyCriterion<K> criterion, final ModelProcessingPhase phase) {
104 checkNotRegistered();
106 final var addedToNs = new AddedToNamespace<C>(this, phase);
108 contextImpl(context).onNamespaceItemAddedAction(namespace, phase, criterion, addedToNs);
112 private <C extends StmtContext<?, ?, ?>> @NonNull AbstractPrerequisite<C> requiresCtxImpl(final C context,
113 final ModelProcessingPhase phase) {
114 checkNotRegistered();
116 final var phaseFin = new PhaseFinished<C>(this);
118 addBootstrap(() -> contextImpl(context).addPhaseCompletedListener(phase, phaseFin));
122 @SuppressWarnings({ "rawtypes", "unchecked" })
123 private <K, C extends Mutable<?, ?, ?>> AbstractPrerequisite<C> mutatesCtxImpl(final StmtContext<?, ?, ?> context,
124 final ParserNamespace<K, ? extends StmtContext<?, ?, ?>> namespace, final K key,
125 final ModelProcessingPhase phase) {
126 checkNotRegistered();
128 final var mod = new PhaseModificationInNamespace<C>(this, EFFECTIVE_MODEL);
131 contextImpl(context).onNamespaceItemAddedAction((ParserNamespace) namespace, key, mod);
135 private static StatementContextBase<?, ?, ?> contextImpl(final Object value) {
136 if (value instanceof StatementContextBase<?, ?, ?> impl) {
139 throw new IllegalArgumentException("Supplied context " + value + " is not provided by this reactor.");
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<>(this, 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, C extends StmtContext<?, ?, ?>> Prerequisite<C> requiresCtx(final StmtContext<?, ?, ?> context,
170 final ParserNamespace<K, C> namespace, final K key, final ModelProcessingPhase phase) {
171 return requiresCtxImpl(context, namespace, key, phase);
175 public <K, C extends StmtContext<?, ?, ?>> Prerequisite<C> requiresCtx(final StmtContext<?, ?, ?> context,
176 final ParserNamespace<K, C> namespace, final NamespaceKeyCriterion<K> criterion,
177 final ModelProcessingPhase phase) {
178 return requiresCtxImpl(context, namespace, criterion, phase);
182 public <K, C extends StmtContext<?, ?, ?>> Prerequisite<C> requiresEffectiveCtxPath(
183 final StmtContext<?, ?, ?> context, final ParserNamespace<K, C> namespace, final Iterable<K> keys) {
184 checkNotRegistered();
186 final var ret = new PhaseRequirementInNamespacePath<C, K>(this, keys);
188 addBootstrap(() -> ret.hookOnto(context, namespace));
193 public <D extends DeclaredStatement<?>> Prerequisite<D> requiresDeclared(
194 final StmtContext<?, ? extends D, ?> context) {
195 return requiresCtxImpl(context, FULL_DECLARATION).transform(StmtContext::declared);
200 public <K, D extends DeclaredStatement<?>> Prerequisite<D> requiresDeclared(final StmtContext<?, ?, ?> context,
201 final ParserNamespace<K, StmtContext<?, ? extends D, ?>> namespace, final K key) {
202 return requiresCtxImpl(context, namespace, key, FULL_DECLARATION).transform(StmtContext::declared);
207 public <K, C extends StmtContext<?, ?, ?>> AbstractPrerequisite<C> requiresDeclaredCtx(
208 final StmtContext<?, ?, ?> context, final ParserNamespace<K, C> namespace, final K key) {
209 return requiresCtxImpl(context, namespace, key, FULL_DECLARATION);
214 public <E extends EffectiveStatement<?, ?>> Prerequisite<E> requiresEffective(
215 final StmtContext<?, ?, ? extends E> stmt) {
216 return requiresCtxImpl(stmt, EFFECTIVE_MODEL).transform(StmtContext::buildEffective);
221 public <K, E extends EffectiveStatement<?, ?>> Prerequisite<E> requiresEffective(final StmtContext<?, ?, ?> context,
222 final ParserNamespace<K, StmtContext<?, ?, ? extends E>> namespace, final K key) {
223 return requiresCtxImpl(context, namespace, key, EFFECTIVE_MODEL).transform(StmtContext::buildEffective);
228 public <K, C extends StmtContext<?, ?, ?>> AbstractPrerequisite<C> requiresEffectiveCtx(
229 final StmtContext<?, ?, ?> context, final ParserNamespace<K, C> namespace, final K key) {
230 return requiresCtxImpl(contextImpl(context), namespace, key, EFFECTIVE_MODEL);
235 public Prerequisite<Mutable<?, ?, ?>> mutatesNs(final Mutable<?, ?, ?> context,
236 final ParserNamespace<?, ?> namespace) {
237 return addMutation(new NamespaceMutation(this, contextImpl(context), namespace));
241 public <K, E extends EffectiveStatement<?, ?>> AbstractPrerequisite<Mutable<?, ?, E>> mutatesEffectiveCtx(
242 final StmtContext<?, ?, ?> context, final ParserNamespace<K, ? extends StmtContext<?, ?, ?>> namespace,
244 return mutatesCtxImpl(context, namespace, key, EFFECTIVE_MODEL);
248 public <K, E extends EffectiveStatement<?, ?>> AbstractPrerequisite<Mutable<?, ?, E>> mutatesEffectiveCtxPath(
249 final StmtContext<?, ?, ?> context, final ParserNamespace<K, ? extends StmtContext<?, ?, ?>> namespace,
250 final Iterable<K> keys) {
251 checkNotRegistered();
253 final var ret = new PhaseModificationInNamespacePath<Mutable<?, ?, E>, K>(this, keys);
256 addBootstrap(() -> ret.hookOnto(context, namespace));
261 @SuppressWarnings("checkstyle:hiddenField")
262 public void apply(final InferenceAction action) {
263 checkState(this.action == null, "Action already defined to %s", this.action);
264 this.action = requireNonNull(action);
265 if (bootstraps != null) {
266 bootstraps.forEach(Runnable::run);
271 private void addBootstrap(final Runnable bootstrap) {
272 if (bootstraps == null) {
273 bootstraps = new ArrayList<>(1);
275 bootstraps.add(bootstrap);
278 private abstract static class AbstractPrerequisite<T> implements Prerequisite<T> {
279 final @NonNull ModifierImpl modifier;
281 private boolean done = false;
284 AbstractPrerequisite(final ModifierImpl modifier) {
285 this.modifier = requireNonNull(modifier);
289 @SuppressWarnings("checkstyle:hiddenField")
290 public final T resolve(final InferenceContext ctx) {
292 checkArgument(ctx == modifier.ctx);
293 return verifyNotNull(value, "Attempted to access unavailable prerequisite %s", this);
296 final boolean isDone() {
300 @SuppressWarnings("checkstyle:hiddenField")
301 final boolean resolvePrereq(final T value) {
304 return modifier.isApplied();
307 final <O> @NonNull Prerequisite<O> transform(final Function<? super T, O> transformation) {
308 return context -> transformation.apply(resolve(context));
312 public final String toString() {
313 return addToStringAttributes(MoreObjects.toStringHelper(this).omitNullValues()).toString();
316 ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
317 return toStringHelper.add("value", value);
321 private abstract static class AbstractPathPrerequisite<C extends StmtContext<?, ?, ?>, K>
322 extends AbstractPrerequisite<C> implements OnNamespaceItemAdded {
323 private final Iterable<K> keys;
324 private final Iterator<K> it;
326 AbstractPathPrerequisite(final ModifierImpl modifier, final Iterable<K> keys) {
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 modifier.action.prerequisiteUnavailable(this);
345 nextStep(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(StatementContextBase<?, ?, ?> current, StatementContextBase<?, ?, ?> next);
362 final ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
363 return super.addToStringAttributes(toStringHelper).add("keys", keys);
366 final void hookOnto(final StmtContext<?, ?, ?> context, final ParserNamespace<?, ?> namespace) {
367 checkArgument(it.hasNext(), "Namespace %s keys may not be empty", namespace);
368 hookOnto(contextImpl(context), namespace, it.next());
371 @SuppressWarnings("unchecked")
372 private void hookOnto(final StatementContextBase<?, ?, ?> context, final ParserNamespace<?, ?> namespace,
374 context.onNamespaceItemAddedAction((ParserNamespace) namespace, requireNonNull(key), this);
378 private static final class PhaseMutation<C> extends AbstractPrerequisite<C> implements ContextMutation {
379 @SuppressWarnings("unchecked")
380 PhaseMutation(final ModifierImpl modifier, final StatementContextBase<?, ?, ?> context,
381 final ModelProcessingPhase phase) {
383 context.addMutation(phase, this);
384 resolvePrereq((C) context);
388 public boolean isFinished() {
389 return modifier.isApplied();
393 private static final class PhaseFinished<C extends StmtContext<?, ?, ?>> extends AbstractPrerequisite<C>
394 implements OnPhaseFinished {
395 PhaseFinished(final ModifierImpl modifier) {
399 @SuppressWarnings("unchecked")
401 public boolean phaseFinished(final StatementContextBase<?, ?, ?> context,
402 final ModelProcessingPhase finishedPhase) {
403 return resolvePrereq((C) context) || modifier.tryApply();
407 private static final class NamespaceMutation extends AbstractPrerequisite<Mutable<?, ?, ?>> {
408 NamespaceMutation(final ModifierImpl modifier, final StatementContextBase<?, ?, ?> ctx,
409 final ParserNamespace<?, ?> namespace) {
415 private static final class AddedToNamespace<C extends StmtContext<?, ?, ?>> extends AbstractPrerequisite<C>
416 implements OnNamespaceItemAdded, OnPhaseFinished {
417 private final ModelProcessingPhase phase;
419 AddedToNamespace(final ModifierImpl modifier, final ModelProcessingPhase phase) {
421 this.phase = requireNonNull(phase);
425 public void namespaceItemAdded(final StatementContextBase<?, ?, ?> context,
426 final ParserNamespace<?, ?> namespace, final Object key, final Object value) {
427 contextImpl(value).addPhaseCompletedListener(phase, this);
430 @SuppressWarnings("unchecked")
432 public boolean phaseFinished(final StatementContextBase<?, ?, ?> context,
433 final ModelProcessingPhase finishedPhase) {
434 return resolvePrereq((C) context) || modifier.tryApply();
438 ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
439 return super.addToStringAttributes(toStringHelper).add("phase", phase);
443 private static final class PhaseRequirementInNamespacePath<C extends StmtContext<?, ?, ?>, K>
444 extends AbstractPathPrerequisite<C, K> {
445 PhaseRequirementInNamespacePath(final ModifierImpl modifier, final Iterable<K> keys) {
446 super(modifier, keys);
450 void nextStep(final StatementContextBase<?, ?, ?> current, final StatementContextBase<?, ?, ?> next) {
455 private static final class PhaseModificationInNamespace<C extends Mutable<?, ?, ?>> extends AbstractPrerequisite<C>
456 implements OnNamespaceItemAdded, ContextMutation {
457 private final ModelProcessingPhase modPhase;
459 PhaseModificationInNamespace(final ModifierImpl modifier, final ModelProcessingPhase phase) {
461 checkArgument(phase != null, "Model processing phase must not be null");
462 this.modPhase = phase;
465 @SuppressWarnings("unchecked")
467 public void namespaceItemAdded(final StatementContextBase<?, ?, ?> context,
468 final ParserNamespace<?, ?> namespace, final Object key, final Object value) {
469 StatementContextBase<?, ?, ?> targetCtx = contextImpl(value);
470 targetCtx.addMutation(modPhase, this);
471 resolvePrereq((C) targetCtx);
475 public boolean isFinished() {
476 return modifier.isApplied();
481 * This similar to {@link PhaseModificationInNamespace}, but allows recursive descent until it finds the real
482 * target. The mechanics is driven as a sequence of prerequisites along a path: first we hook onto namespace to
483 * give us the first step. When it does, we hook onto the first item to provide us the second step and so on.
485 private static final class PhaseModificationInNamespacePath<C extends Mutable<?, ?, ?>, K>
486 extends AbstractPathPrerequisite<C, K> implements ContextMutation {
487 PhaseModificationInNamespacePath(final ModifierImpl modifier, final Iterable<K> keys) {
488 super(modifier, keys);
492 public boolean isFinished() {
493 return modifier.isApplied();
497 void nextStep(final StatementContextBase<?, ?, ?> current, final StatementContextBase<?, ?, ?> next) {
498 // Hook onto target: we either have a modification of the target itself or one of its children.
499 next.addMutation(EFFECTIVE_MODEL, this);
500 // We have completed the context -> target step, hence we are no longer directly blocking context from
501 // making forward progress.
502 current.removeMutation(EFFECTIVE_MODEL, this);