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[proxima-beam-core] add SchemaStreamElementCoder
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beam/core/src/main/java/cz/o2/proxima/beam/core/io/SchemaStreamElementCoder.java
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| /* | ||
| * Copyright 2017-2023 O2 Czech Republic, a.s. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package cz.o2.proxima.beam.core.io; | ||
|
|
||
| import cz.o2.proxima.core.repository.AttributeDescriptor; | ||
| import cz.o2.proxima.core.repository.EntityAwareAttributeDescriptor; | ||
| import cz.o2.proxima.core.repository.EntityAwareAttributeDescriptor.Regular; | ||
| import cz.o2.proxima.core.repository.EntityAwareAttributeDescriptor.Wildcard; | ||
| import cz.o2.proxima.core.repository.EntityDescriptor; | ||
| import cz.o2.proxima.core.repository.Repository; | ||
| import cz.o2.proxima.core.scheme.AttributeValueAccessor; | ||
| import cz.o2.proxima.core.scheme.AttributeValueAccessors.StructureValue; | ||
| import cz.o2.proxima.core.scheme.AttributeValueType; | ||
| import cz.o2.proxima.core.scheme.SchemaDescriptors.ArrayTypeDescriptor; | ||
| import cz.o2.proxima.core.scheme.SchemaDescriptors.SchemaTypeDescriptor; | ||
| import cz.o2.proxima.core.scheme.SchemaDescriptors.StructureTypeDescriptor; | ||
| import cz.o2.proxima.core.scheme.ValueSerializer; | ||
| import cz.o2.proxima.core.storage.StreamElement; | ||
| import cz.o2.proxima.core.util.Optionals; | ||
| import cz.o2.proxima.core.util.Pair; | ||
| import cz.o2.proxima.internal.com.google.common.collect.ImmutableMap; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.Objects; | ||
| import javax.annotation.Nonnull; | ||
| import javax.annotation.Nullable; | ||
| import org.apache.beam.sdk.schemas.Schema; | ||
| import org.apache.beam.sdk.schemas.Schema.Builder; | ||
| import org.apache.beam.sdk.schemas.Schema.Field; | ||
| import org.apache.beam.sdk.schemas.Schema.FieldType; | ||
| import org.apache.beam.sdk.schemas.SchemaCoder; | ||
| import org.apache.beam.sdk.util.Preconditions; | ||
| import org.apache.beam.sdk.values.Row; | ||
| import org.apache.beam.sdk.values.Row.FieldValueBuilder; | ||
| import org.apache.beam.sdk.values.TypeDescriptor; | ||
|
|
||
| public class SchemaStreamElementCoder extends SchemaCoder<StreamElement> { | ||
|
|
||
| public static final Map<AttributeValueType, FieldType> FIELD_TYPES = | ||
| ImmutableMap.<AttributeValueType, FieldType>builder() | ||
| .put(AttributeValueType.BOOLEAN, FieldType.BOOLEAN) | ||
| .put(AttributeValueType.BYTE, FieldType.BYTE) | ||
| .put(AttributeValueType.DOUBLE, FieldType.DOUBLE) | ||
| .put(AttributeValueType.FLOAT, FieldType.FLOAT) | ||
| .put(AttributeValueType.INT, FieldType.INT32) | ||
| .put(AttributeValueType.LONG, FieldType.INT64) | ||
| .put(AttributeValueType.STRING, FieldType.STRING) | ||
| .build(); | ||
| private static final Map<AttributeDescriptor<?>, EntityAwareAttributeDescriptor<Object>> | ||
| ATTR_CACHE = new HashMap<>(); | ||
|
|
||
| private static final Map<String, EntityAwareAttributeDescriptor<Object>> ATTR_NAME_CACHE = | ||
| new HashMap<>(); | ||
|
|
||
| public static SchemaStreamElementCoder of(Repository repo) { | ||
| if (ATTR_CACHE.isEmpty()) { | ||
| repo.getAllEntities() | ||
| .flatMap(e -> e.getAllAttributes().stream().map(a -> Pair.of(e, a))) | ||
| .forEach( | ||
| p -> { | ||
| EntityAwareAttributeDescriptor<Object> aware = asAware(p.getFirst(), p.getSecond()); | ||
| ATTR_CACHE.put(p.getSecond(), aware); | ||
| ATTR_NAME_CACHE.put(asAttributeFieldName(p.getFirst(), p.getSecond()), aware); | ||
| }); | ||
| } | ||
| return new SchemaStreamElementCoder(asSchema(repo)); | ||
| } | ||
|
|
||
| private static String asAttributeFieldName(String entity, String attribute) { | ||
| return entity + "_" + attribute; | ||
| } | ||
|
|
||
| private static String asAttributeFieldName(EntityDescriptor entity, AttributeDescriptor<?> attr) { | ||
| return asAttributeFieldName(entity.getName(), attr.toAttributePrefix(false)); | ||
| } | ||
|
|
||
| private static String asAttributeFieldName(StreamElement element) { | ||
| return asAttributeFieldName(element.getEntityDescriptor(), element.getAttributeDescriptor()); | ||
| } | ||
|
|
||
| @SuppressWarnings("unchecked") | ||
| private static EntityAwareAttributeDescriptor<Object> asAware( | ||
| EntityDescriptor entity, AttributeDescriptor<?> attr) { | ||
| if (attr.isWildcard()) { | ||
| return Wildcard.of(entity, (AttributeDescriptor<Object>) attr); | ||
| } | ||
| return Regular.of(entity, (AttributeDescriptor<Object>) attr); | ||
| } | ||
|
|
||
| private static Schema asSchema(Repository repo) { | ||
| Builder builder = | ||
| Schema.builder() | ||
| .addStringField("key") | ||
| .addInt64Field("stamp") | ||
| // entity.attribute format | ||
| .addStringField("attributeName") | ||
| .addBooleanField("delete") | ||
| .addNullableStringField("attribute") | ||
| .addNullableStringField("uuid") | ||
| .addNullableInt64Field("seqId"); | ||
| repo.getAllEntities() | ||
| .flatMap(e -> e.getAllAttributes().stream()) | ||
| .forEach(attr -> addToBuilder(attr, builder)); | ||
| return builder.build(); | ||
| } | ||
|
|
||
| private static void addToBuilder(AttributeDescriptor<?> attr, Builder builder) { | ||
| String entity = attr.getEntity(); | ||
| String name = attr.toAttributePrefix(false); | ||
| addFieldToBuilder( | ||
| asAttributeFieldName(entity, name), | ||
| attr.getValueSerializer().getValueSchemaDescriptor(), | ||
| builder); | ||
| } | ||
|
|
||
| private static void addFieldToBuilder( | ||
| String name, SchemaTypeDescriptor<?> valueSchemaDescriptor, Builder builder) { | ||
|
|
||
| builder.addNullableField(name, getRequiredField(valueSchemaDescriptor)); | ||
| } | ||
|
|
||
| private static @Nonnull FieldType getRequiredField(SchemaTypeDescriptor<?> schema) { | ||
| AttributeValueType type = schema.getType(); | ||
| if (type.equals(AttributeValueType.STRUCTURE)) { | ||
| StructureTypeDescriptor<?> structure = schema.asStructureTypeDescriptor(); | ||
| Schema.Builder builder = Schema.builder(); | ||
| structure.getFields().forEach((n, f) -> addFieldToBuilder(n, f, builder)); | ||
| return FieldType.row(builder.build()); | ||
| } else if (type.equals(AttributeValueType.ARRAY)) { | ||
| ArrayTypeDescriptor<?> arrayDesc = schema.asArrayTypeDescriptor(); | ||
| if (arrayDesc.getValueType().equals(AttributeValueType.BYTE)) { | ||
| return FieldType.BYTES; | ||
| } | ||
| return FieldType.array(getRequiredField(arrayDesc.getValueDescriptor())); | ||
| } else { | ||
| return Objects.requireNonNull( | ||
| FIELD_TYPES.get(type), () -> String.format("Unknown type %s", type)); | ||
| } | ||
| } | ||
|
|
||
| private static StreamElement fromRow(Row row) { | ||
| String key = row.getString("key"); | ||
| long stamp = Objects.requireNonNull(row.getInt64("stamp")); | ||
| @Nullable String attribute = row.getString("attribute"); | ||
| String attributeName = row.getString("attributeName"); | ||
| boolean delete = Objects.requireNonNull(row.getBoolean("delete")); | ||
| String uuid = row.getString("uuid"); | ||
| Long seqId = row.getInt64("seqId"); | ||
| EntityAwareAttributeDescriptor<Object> entityAware = | ||
| Objects.requireNonNull( | ||
| ATTR_NAME_CACHE.get(attributeName), | ||
| () -> String.format("Missing attribute %s", attributeName)); | ||
| if (entityAware.isWildcard()) { | ||
| Preconditions.checkArgumentNotNull(attribute); | ||
| Wildcard<Object> wildcard = (Wildcard<Object>) entityAware; | ||
| if (delete) { | ||
| if (attribute.endsWith(".*")) { | ||
| if (seqId == null) { | ||
| return wildcard.deleteWildcard(uuid, key, stamp); | ||
| } | ||
| return wildcard.deleteWildcard(seqId, key, stamp); | ||
| } | ||
| if (seqId == null) { | ||
| return wildcard.delete(uuid, key, attribute, stamp); | ||
| } | ||
| return wildcard.delete(seqId, key, attribute, stamp); | ||
| } | ||
| Object value = | ||
| entityAware | ||
| .getValueSerializer() | ||
| .getValueAccessor() | ||
| .createFrom(row.getBaseValue(attributeName)); | ||
| if (seqId == null) { | ||
| return wildcard.upsert(uuid, key, attribute, stamp, value); | ||
| } | ||
| return wildcard.upsert(seqId, key, attribute, stamp, value); | ||
| } | ||
| Regular<Object> regular = (Regular<Object>) entityAware; | ||
| if (delete) { | ||
| if (seqId == null) { | ||
| return regular.delete(uuid, key, stamp); | ||
| } | ||
| return regular.delete(seqId, key, stamp); | ||
| } | ||
| Object value = | ||
| entityAware | ||
| .getValueSerializer() | ||
| .getValueAccessor() | ||
| .createFrom( | ||
| fromFieldType( | ||
| row.getSchema().getField(attributeName).getType(), | ||
| row.getValue(attributeName))); | ||
| if (seqId == null) { | ||
| return regular.upsert(uuid, key, stamp, value); | ||
| } | ||
| return regular.upsert(seqId, key, stamp, value); | ||
| } | ||
|
|
||
| private static Row toRow(Schema schema, StreamElement element) { | ||
| Objects.requireNonNull( | ||
| ATTR_CACHE.get(element.getAttributeDescriptor()), | ||
| () -> String.format("Missing attribute %s", element.getAttributeDescriptor())); | ||
| String attributeName = asAttributeFieldName(element); | ||
| FieldValueBuilder builder = | ||
| Row.withSchema(schema) | ||
| .withFieldValue("key", element.getKey()) | ||
| .withFieldValue("stamp", element.getStamp()) | ||
| .withFieldValue("attributeName", attributeName) | ||
| .withFieldValue("delete", element.isDelete()); | ||
| if (element.getAttributeDescriptor().isWildcard()) { | ||
| builder = | ||
| builder.withFieldValue( | ||
| "attribute", | ||
| element | ||
| .getAttribute() | ||
| .substring(element.getAttributeDescriptor().toAttributePrefix().length())); | ||
| } | ||
| if (element.hasSequentialId()) { | ||
| builder = builder.withFieldValue("seqId", element.getSequentialId()); | ||
| } else { | ||
| builder = builder.withFieldValue("uuid", element.getUuid()); | ||
| } | ||
| if (!element.isDelete()) { | ||
| Object parsed = Optionals.get(element.getParsed()); | ||
| @SuppressWarnings("unchecked") | ||
| ValueSerializer<Object> valueSerializer = | ||
| (ValueSerializer<Object>) element.getAttributeDescriptor().getValueSerializer(); | ||
| Object mapped = | ||
| intoFieldType( | ||
| valueSerializer.getValueAccessor().valueOf(parsed), | ||
| schema.getField(attributeName).getType()); | ||
| builder = builder.withFieldValue(attributeName, mapped); | ||
| } | ||
| return builder.build(); | ||
| } | ||
|
|
||
| /** | ||
| * Convert the given accessor to object that is compatible with Beam Schema. | ||
| * | ||
| * @param accessor the object returned by Proxima {@link AttributeValueAccessor} | ||
| * @param field the type to convert the object to | ||
| * @return object compatible with equal Beam {@link FieldType} | ||
| */ | ||
| private static Object intoFieldType(Object accessor, FieldType field) { | ||
| if (field.getRowSchema() != null) { | ||
| @SuppressWarnings("unchecked") | ||
| Map<String, Object> map = (Map<String, Object>) accessor; | ||
| return asRow(map, field); | ||
| } | ||
| return accessor; | ||
| } | ||
|
|
||
| private static Object fromFieldType(FieldType type, Object value) { | ||
| if (type.getRowSchema() != null) { | ||
| return StructureValue.of(asStructureValue((Row) value)); | ||
| } | ||
| return value; | ||
| } | ||
|
|
||
| private static Row asRow(Map<String, Object> map, FieldType field) { | ||
| Schema schema = Objects.requireNonNull(field.getRowSchema()); | ||
| return Row.withSchema(schema).withFieldValues(map).build(); | ||
| } | ||
|
|
||
| private static Map<String, Object> asStructureValue(Row value) { | ||
| Map<String, Object> res = new HashMap<>(); | ||
| for (Field f : value.getSchema().getFields()) { | ||
| Object fieldValue = value.getValue(f.getName()); | ||
| if (fieldValue != null) { | ||
| if (f.getType().getRowSchema() != null) { | ||
| res.put(f.getName(), asStructureValue((Row) fieldValue)); | ||
| } else { | ||
| res.put(f.getName(), fieldValue); | ||
| } | ||
| } | ||
| } | ||
| return res; | ||
| } | ||
|
|
||
| private SchemaStreamElementCoder(Schema schema) { | ||
| super( | ||
| schema, | ||
| TypeDescriptor.of(StreamElement.class), | ||
| elem -> toRow(schema, elem), | ||
| SchemaStreamElementCoder::fromRow); | ||
| } | ||
| } |
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