*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
- * and is available at http://www.eclipse.org/legal/eplv10.html
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.yangtools.yang.model.repo.spi;
-import com.google.common.util.concurrent.CheckedFuture;
+import static java.util.Objects.requireNonNull;
+import com.google.common.util.concurrent.AsyncFunction;
+import com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.ListenableFuture;
+import com.google.common.util.concurrent.MoreExecutors;
+import java.util.HashMap;
+import java.util.Map;
+import org.opendaylight.yangtools.yang.model.repo.api.SchemaRepository;
import org.opendaylight.yangtools.yang.model.repo.api.SchemaSourceRepresentation;
+import org.opendaylight.yangtools.yang.model.repo.api.SourceIdentifier;
-/**
- * An schema source representation transformation service. An instance can create
- * some output schema source representation based on some input source representation.
- *
- * @param <I> Input {@link SchemaSourceRepresentation}
- * @param <O> Output {@link SchemaSourceRepresentation}
- */
-public interface SchemaSourceTransformer<I extends SchemaSourceRepresentation, O extends SchemaSourceRepresentation> {
- /**
- * Return the {@link SchemaSourceRepresentation} which this transformer
- * accepts on its input.
- *
- * @return The input source representation type.
- */
- Class<I> getInputRepresentation();
-
- /**
- * Return the {@link SchemeSourceRepresentation} which this transformer
- * produces on its output.
- *
- * @return The output source representation type.
- */
- Class<O> getOutputRepresentation();
-
- /**
- * Transform a schema source representation from its input form to
- * the transformers output form.
- *
- * @param source Schema source in its source representation
- * @return A future which produces the output schema source representation.
- */
- CheckedFuture<O, SchemaSourceTransformationException> transformSchemaSource(I source);
-
- /**
- * Return the relative cost of performing the transformation. When in doubt,
- * return 1.
- *
- * @return Relative cost.
- */
- int getCost();
+public class SchemaSourceTransformer<S extends SchemaSourceRepresentation, D extends SchemaSourceRepresentation>
+ implements SchemaSourceListener, SchemaSourceProvider<D> {
+
+ @FunctionalInterface
+ public interface Transformation<S extends SchemaSourceRepresentation, D extends SchemaSourceRepresentation>
+ extends AsyncFunction<S, D> {
+ @Override
+ ListenableFuture<D> apply(S input) throws Exception;
+ }
+
+ private final Map<PotentialSchemaSource<?>, RefcountedRegistration> availableSources = new HashMap<>();
+ private final SchemaSourceRegistry consumer;
+ private final SchemaRepository provider;
+ private final AsyncFunction<S, D> function;
+ private final Class<S> srcClass;
+ private final Class<D> dstClass;
+
+ public SchemaSourceTransformer(final SchemaRepository provider, final Class<S> srcClass,
+ final SchemaSourceRegistry consumer, final Class<D> dstClass, final AsyncFunction<S, D> function) {
+ this.provider = requireNonNull(provider);
+ this.consumer = requireNonNull(consumer);
+ this.function = requireNonNull(function);
+ this.srcClass = requireNonNull(srcClass);
+ this.dstClass = requireNonNull(dstClass);
+ }
+
+ @Override
+ public final ListenableFuture<D> getSource(final SourceIdentifier sourceIdentifier) {
+ return Futures.transformAsync(provider.getSchemaSource(sourceIdentifier, srcClass), function,
+ MoreExecutors.directExecutor());
+ }
+
+ @Override
+ public final void schemaSourceEncountered(final SchemaSourceRepresentation source) {
+ // Not interesting
+ }
+
+ @Override
+ public final void schemaSourceRegistered(final Iterable<PotentialSchemaSource<?>> sources) {
+ for (PotentialSchemaSource<?> src : sources) {
+ final Class<?> rep = src.getRepresentation();
+ if (srcClass.isAssignableFrom(rep) && dstClass != rep) {
+ registerSource(src);
+ }
+ }
+ }
+
+ @Override
+ public final void schemaSourceUnregistered(final PotentialSchemaSource<?> source) {
+ final Class<?> rep = source.getRepresentation();
+ if (srcClass.isAssignableFrom(rep) && dstClass != rep) {
+ unregisterSource(source);
+ }
+ }
+
+ private void registerSource(final PotentialSchemaSource<?> src) {
+ RefcountedRegistration reg = availableSources.get(src);
+ if (reg != null) {
+ reg.incRef();
+ return;
+ }
+
+ final PotentialSchemaSource<D> newSrc = PotentialSchemaSource.create(src.getSourceIdentifier(), dstClass,
+ src.getCost() + PotentialSchemaSource.Costs.COMPUTATION.getValue());
+
+ final SchemaSourceRegistration<D> r = consumer.registerSchemaSource(this, newSrc);
+ availableSources.put(src, new RefcountedRegistration(r));
+ }
+
+ private void unregisterSource(final PotentialSchemaSource<?> src) {
+ final RefcountedRegistration reg = availableSources.get(src);
+ if (reg != null && reg.decRef()) {
+ availableSources.remove(src);
+ }
+ }
}
Code Review / yangtools.git / blobdiff