imay commented on a change in pull request #2343: [Tag System]Add classes 
related to "tag".
URL: https://github.com/apache/incubator-doris/pull/2343#discussion_r357517541
 
 

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 File path: fe/src/main/java/org/apache/doris/resource/Resource.java
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 @@ -0,0 +1,73 @@
+// 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.doris.resource;
+
+import org.apache.doris.common.io.Writable;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+
+/*
+ * Resource is the collective name of the nodes that provide various service 
capabilities in Doris cluster.
+ * Each resource has a unique ID.
+ * A resource may have one or more tags that represent the functional 
properties or custom groupings of a resource, etc.
+ * eg:
+ *      Backend, Frontend, Broker, RemoteStorage
+ */
+public abstract class Resource implements Writable {
+    protected long id;
+    protected TagSet tagSet;
+
+    public Resource(long id, TagSet tagSet) {
+        this.tagSet = tagSet;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public TagSet getTagSet() {
+        return tagSet;
+    }
+
+    public void addTag(Tag.Type type, String tagName) {
+        Tag tag = Tag.create(type, tagName);
+        tagSet.addTag(tag);
+    }
+
+    public void setTag(Tag.Type type, String tagName) {
+        TagSet newTagSet = TagSet.create(Tag.create(type, tagName));
+        tagSet.substituteMerge(newTagSet);
+    }
+
+    public void setTagSet(TagSet tagSet) {
+        this.tagSet = tagSet;
+    }
+
+    @Override
+    public void write(DataOutput out) throws IOException {
+        out.writeLong(id);
+        tagSet.write(out);
 
 Review comment:
   Use new method of serialization?

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