org.apache.pulsar.client.impl.schema.generic.MultiVersionGenericJsonReader Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
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* to you 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.pulsar.client.impl.schema.generic;
import static org.apache.pulsar.client.impl.schema.util.SchemaUtil.parseAvroSchema;
import java.util.List;
import java.util.stream.Collectors;
import org.apache.pulsar.shade.org.apache.avro.Schema;
import org.apache.pulsar.client.api.schema.Field;
import org.apache.pulsar.client.api.schema.GenericRecord;
import org.apache.pulsar.client.api.schema.SchemaReader;
import org.apache.pulsar.client.impl.schema.SchemaUtils;
import org.apache.pulsar.common.protocol.schema.BytesSchemaVersion;
import org.apache.pulsar.common.schema.SchemaInfo;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A multi version generic json reader.
*/
public class MultiVersionGenericJsonReader extends AbstractMultiVersionGenericReader {
public MultiVersionGenericJsonReader(boolean useProvidedSchemaAsReaderSchema, Schema readerSchema,
SchemaInfo schemaInfo, List fields) {
super(useProvidedSchemaAsReaderSchema, new GenericJsonReader(fields, schemaInfo), readerSchema);
}
@Override
protected SchemaReader loadReader(BytesSchemaVersion schemaVersion) {
SchemaInfo schemaInfo = getSchemaInfoByVersion(schemaVersion.get());
if (schemaInfo != null) {
LOG.info("Load schema reader for version({}), schema is : {}",
SchemaUtils.getStringSchemaVersion(schemaVersion.get()),
schemaInfo.getSchemaDefinition());
Schema readerSchema;
if (useProvidedSchemaAsReaderSchema) {
readerSchema = this.readerSchema;
} else {
readerSchema = parseAvroSchema(schemaInfo.getSchemaDefinition());
}
return new GenericJsonReader(schemaVersion.get(),
readerSchema.getFields()
.stream()
.map(f -> new Field(f.name(), f.pos()))
.collect(Collectors.toList()), schemaInfo);
} else {
LOG.warn("No schema found for version({}), use latest schema : {}",
SchemaUtils.getStringSchemaVersion(schemaVersion.get()),
this.readerSchema);
return providerSchemaReader;
}
}
protected static final Logger LOG = LoggerFactory.getLogger(MultiVersionGenericAvroReader.class);
}