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From keith-turner <...@git.apache.org>
Subject [GitHub] accumulo pull request #256: ACCUMULO-4463: Make block cache implementation c...
Date Fri, 12 May 2017 19:12:06 GMT
Github user keith-turner commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/256#discussion_r116304148
  
    --- Diff: core/src/main/java/org/apache/accumulo/core/file/blockfile/cache/lru/LruBlockCacheManager.java
---
    @@ -0,0 +1,48 @@
    +/*
    + * 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.accumulo.core.file.blockfile.cache.lru;
    +
    +import java.util.Map.Entry;
    +
    +import org.apache.accumulo.core.conf.AccumuloConfiguration;
    +import org.apache.accumulo.core.file.blockfile.cache.BlockCache;
    +import org.apache.accumulo.core.file.blockfile.cache.BlockCacheManager;
    +import org.apache.accumulo.core.file.blockfile.cache.CacheType;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +public class LruBlockCacheManager extends BlockCacheManager {
    +
    +  private static final Logger LOG = LoggerFactory.getLogger(LruBlockCacheManager.class);
    +
    +  @Override
    +  protected BlockCache createCache(AccumuloConfiguration conf, CacheType type) {
    +    LruBlockCacheConfiguration cc = new LruBlockCacheConfiguration(conf, type);
    +    LOG.info("Creating {} cache with configuration {}", type, cc);
    +    return new LruBlockCache(cc);
    +  }
    +
    +  @Override
    +  public void stop() {
    +    for (Entry<CacheType,BlockCache> e : this.caches.entrySet()) {
    --- End diff --
    
    This code could also be written like the following, and then maybe the map in the superclass
does not need to be made visible.
    
    ```java
      for(CacheType ct : CacheType.values()) { //not sure if values() is the correct enum
method name
          ((LruBlockCache) getBlockCache(ct)).shutdown();
      }
    ```


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