Github user lvfangmin commented on a diff in the pull request:
https://github.com/apache/zookeeper/pull/632#discussion_r224843869
--- 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 --
We can do that, previously we have other initialization in this
constructor, but not anymore after I refactored it, will remove the constructor
here.
---
