Github user eribeiro commented on a diff in the pull request: https://github.com/apache/zookeeper/pull/632#discussion_r224210799 --- Diff: zookeeper-server/src/main/java/org/apache/zookeeper/server/NodeHashMapImpl.java --- @@ -0,0 +1,116 @@ +/** + * 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.zookeeper.server; + +import java.util.Map; +import java.util.Set; +import java.util.concurrent.ConcurrentHashMap; + +import org.apache.zookeeper.server.util.DigestCalculator; +import org.apache.zookeeper.server.util.AdHash; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * a simple wrapper to ConcurrentHashMap that recalculates a digest after + * each mutation. + */ +public class NodeHashMapImpl implements NodeHashMap { + + private static final Logger LOG = LoggerFactory.getLogger(NodeHashMap.class); + + private final ConcurrentHashMap<String, DataNode> nodes; + + private AdHash hash; + + public NodeHashMapImpl() { + nodes = new ConcurrentHashMap<String, DataNode>(); + hash = new AdHash(); --- End diff -- Uh... Those two lines couldn't be moved to respective declarations of `nodes` and `hash`?
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