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/*
 * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
 * (the "License"). You may not use this work except in compliance with the License, which is
 * available at www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied, as more fully set forth in the License.
 *
 * See the NOTICE file distributed with this work for information regarding copyright ownership.
 */

package alluxio.master.meta;

import alluxio.Constants;
import alluxio.master.CoreMasterContext;
import alluxio.master.Master;
import alluxio.master.MasterFactory;
import alluxio.master.MasterRegistry;
import alluxio.master.block.BlockMaster;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.concurrent.ThreadSafe;

/**
 * Factory to create a {@link MetaMaster} instance.
 */
@ThreadSafe
public final class MetaMasterFactory implements MasterFactory {
  private static final Logger LOG = LoggerFactory.getLogger(MetaMasterFactory.class);

  /**
   * Constructs a new {@link MetaMasterFactory}.
   */
  public MetaMasterFactory() {}

  @Override
  public boolean isEnabled() {
    return true;
  }

  @Override
  public String getName() {
    return Constants.META_MASTER_NAME;
  }

  @Override
  public Master create(MasterRegistry registry, CoreMasterContext context) {
    LOG.info("Creating {} ", MetaMaster.class.getName());
    MetaMaster metaMaster = new DefaultMetaMaster(registry.get(BlockMaster.class), context);
    registry.add(MetaMaster.class, metaMaster);
    return metaMaster;
  }
}