content: /*
   * 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;
  
  import alluxio.Constants;
  import alluxio.conf.Configuration;
  import alluxio.conf.PropertyKey;
  import alluxio.master.metastore.BlockMetaStore;
  import alluxio.master.metastore.InodeStore;
  import alluxio.master.metastore.MetastoreType;
  import alluxio.master.metastore.caching.CachingInodeStore;
  import alluxio.master.metastore.heap.HeapBlockMetaStore;
  import alluxio.master.metastore.heap.HeapInodeStore;
  import alluxio.master.metastore.rocks.RocksBlockMetaStore;
  import alluxio.master.metastore.rocks.RocksInodeStore;
  import alluxio.util.CommonUtils;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.concurrent.Callable;
  
  /**
   * This class encapsulates the different master services that are configured to run.
   */
  public final class MasterUtils {
    private MasterUtils() {}  // prevent instantiation
  
    /**
     * Creates all the masters and registers them to the master registry.
     *
     * @param registry the master registry
     * @param context master context
     */
    public static void createMasters(MasterRegistry registry, MasterContext context) {
      List<Callable<Void>> callables = new ArrayList<>();
      for (final MasterFactory factory : alluxio.master.ServiceUtils.getMasterServiceLoader()) {
        callables.add(() -> {
          if (factory.isEnabled()) {
            factory.create(registry, context);
          }
          return null;
        });
      }
      try {
        CommonUtils.invokeAll(callables, 10L * Constants.MINUTE_MS);
      } catch (Exception e) {
        throw new RuntimeException("Failed to start masters", e);
      }
    }
  
    /**
     * @param baseDir the base directory in which to store on-disk metadata
     * @return a block store factory of the configured type
     */
    public static BlockMetaStore.Factory getBlockStoreFactory(String baseDir) {
      MetastoreType type = Configuration.isSetByUser(PropertyKey.MASTER_BLOCK_METASTORE)
          ? Configuration.getEnum(PropertyKey.MASTER_BLOCK_METASTORE, MetastoreType.class) :
          Configuration.getEnum(PropertyKey.MASTER_METASTORE, MetastoreType.class);
      switch (type) {
        case HEAP:
          return HeapBlockMetaStore::new;
        case ROCKS:
          return () -> new RocksBlockMetaStore(baseDir);
        default:
          throw new IllegalStateException("Unknown metastore type: " + type);
      }
    }
  
    /**
     * @param baseDir the base directory in which to store on-disk metadata
     * @return an inode store factory of the configured type
     */
    public static InodeStore.Factory getInodeStoreFactory(String baseDir) {
      MetastoreType type = Configuration.isSetByUser(PropertyKey.MASTER_INODE_METASTORE)
          ? Configuration.getEnum(PropertyKey.MASTER_INODE_METASTORE, MetastoreType.class) :
          Configuration.getEnum(PropertyKey.MASTER_METASTORE, MetastoreType.class);
      switch (type) {
        case HEAP:
          return lockManager -> new HeapInodeStore();
        case ROCKS:
          if (Configuration.getInt(PropertyKey.MASTER_METASTORE_INODE_CACHE_MAX_SIZE) == 0) {
            return lockManager -> new RocksInodeStore(baseDir);
          } else {
            return lockManager -> new CachingInodeStore(new RocksInodeStore(baseDir), lockManager);
          }
        default:
          throw new IllegalStateException("Unknown metastore type: " + type);
      }
    }
  }
  