content: /*
   * 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 org.apache.bookkeeper.metastore;
  
  import java.util.HashMap;
  import java.util.Map;
  import org.apache.commons.configuration2.Configuration;
  
  /**
   * An in-memory implementation of the MetaStore interface.
   */
  public class InMemoryMetaStore implements MetaStore {
  
      static final int CUR_VERSION = 1;
  
      static Map<String, InMemoryMetastoreTable> tables =
          new HashMap<String, InMemoryMetastoreTable>();
  
      // for test
      public static void reset() {
          tables.clear();
      }
  
      @Override
      public String getName() {
          return getClass().getName();
      }
  
      @Override
      public int getVersion() {
          return CUR_VERSION;
      }
  
      @Override
      public void init(Configuration conf, int msVersion)
      throws MetastoreException {
          // do nothing
      }
  
      @Override
      public void close() {
          // do nothing
      }
  
      @Override
      public MetastoreTable createTable(String name) {
          return createInMemoryTable(name);
      }
  
      @Override
      public MetastoreScannableTable createScannableTable(String name) {
          return createInMemoryTable(name);
      }
  
      private InMemoryMetastoreTable createInMemoryTable(String name) {
          InMemoryMetastoreTable t = tables.get(name);
          if (t == null) {
              t = new InMemoryMetastoreTable(this, name);
              tables.put(name, t);
          }
          return t;
      }
  
  }
  