KafkaSchemaRegistryFactory.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file 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 "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 gobblin.kafka.schemareg;

import java.lang.reflect.InvocationTargetException;
import java.util.Properties;

import org.apache.commons.lang3.reflect.ConstructorUtils;

import com.google.common.base.Preconditions;
import com.google.common.base.Throwables;

import lombok.extern.slf4j.Slf4j;


/**
 * A Factory that constructs and hands back {@link KafkaSchemaRegistry} implementations.
 */
@Slf4j
public class KafkaSchemaRegistryFactory {

  public static final String DEFAULT_TRY_CACHING = "true";

  @SuppressWarnings("unchecked")
  public static KafkaSchemaRegistry getSchemaRegistry(Properties props) {
    Preconditions.checkArgument(props.containsKey(KafkaSchemaRegistryConfigurationKeys.KAFKA_SCHEMA_REGISTRY_CLASS),
        "Missing required property " + KafkaSchemaRegistryConfigurationKeys.KAFKA_SCHEMA_REGISTRY_CLASS);

    boolean tryCache = Boolean.parseBoolean(props.getProperty(KafkaSchemaRegistryConfigurationKeys.KAFKA_SCHEMA_REGISTRY_CACHE,
        DEFAULT_TRY_CACHING));

    Class<?> clazz;
    try {
      clazz =
          (Class<?>) Class.forName(props.getProperty(KafkaSchemaRegistryConfigurationKeys.KAFKA_SCHEMA_REGISTRY_CLASS));
      KafkaSchemaRegistry schemaRegistry = (KafkaSchemaRegistry) ConstructorUtils.invokeConstructor(clazz, props);
      if (tryCache && !schemaRegistry.hasInternalCache())
      {
        schemaRegistry = new CachingKafkaSchemaRegistry(schemaRegistry);
      }
      return schemaRegistry;
    } catch (ClassNotFoundException | NoSuchMethodException | IllegalAccessException | InvocationTargetException
        | InstantiationException e) {
      log.error("Failed to instantiate " + KafkaSchemaRegistry.class, e);
      throw Throwables.propagate(e);
    }
  }
}