ReflectionCompactorFactory.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.compaction;

import java.util.List;
import java.util.Properties;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Optional;

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

import gobblin.compaction.listeners.CompactorListener;
import gobblin.metrics.Tag;


/**
 * Implementation of {@link CompactorFactory} that creates a {@link Compactor} using reflection.
 */
public class ReflectionCompactorFactory implements CompactorFactory {

  @VisibleForTesting
  static final String COMPACTION_COMPACTOR_CLASS = "compaction.compactor.class";
  private static final String DEFAULT_COMPACTION_COMPACTOR_CLASS = "gobblin.compaction.mapreduce.MRCompactor";

  @Override
  public Compactor createCompactor(Properties properties, List<Tag<String>> tags,
      Optional<CompactorListener> compactorListener) throws CompactorCreationException {

    String compactorClassName = properties.getProperty(COMPACTION_COMPACTOR_CLASS, DEFAULT_COMPACTION_COMPACTOR_CLASS);
    try {
      return (Compactor) ConstructorUtils
          .invokeConstructor(Class.forName(compactorClassName), properties, tags, compactorListener);
    } catch (ReflectiveOperationException e) {
      throw new CompactorCreationException(String
          .format("Unable to create Compactor from key \"%s\" with value \"%s\"", COMPACTION_COMPACTOR_CLASS,
              compactorClassName), e);
    }
  }
}