Github user carsonwang commented on a diff in the pull request:
https://github.com/apache/spark/pull/7399#discussion_r34865792
--- Diff: core/src/main/scala/org/apache/spark/ui/PagedTable.scala ---
@@ -0,0 +1,221 @@
+/*
+ * 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.spark.ui
+
+import scala.xml.{Node, Unparsed}
+
+/**
+ * A data source that provides data for a page.
+ *
+ * @param page the page number
+ * @param pageSize the number of rows in a page
+ */
+private[ui] abstract class PagedDataSource[T](page: Int, pageSize: Int) {
+
+ protected val data: Seq[T]
+
+ /**
+ * Slice the data for this page
+ */
+ def pageData: PageData[T] = {
+ val dataSize = data.size
+ val totalPages = (dataSize + pageSize - 1) / pageSize
+ require(page > 0, "page must be positive")
+ require(page <= totalPages, s"page must not exceed $totalPages")
+ val from = (page - 1) * pageSize
+ val to = dataSize.min(page * pageSize)
+ PageData(page, totalPages, data.slice(from, to))
+ }
+
+}
+
+/**
+ * The data returned by `PagedDataSource.pageData`, including the page
number, the number of total
+ * pages and the data in this page.
+ */
+private[ui] case class PageData[T](page: Int, totalPage: Int, data: Seq[T])
+
+/**
+ * A paged table that will generate a HTML table for a specified page and
also the page navigation.
+ */
+private[ui] trait PagedTable[T] {
+
+ def tableId: String
+
+ def tableCssClass: String
+
+ def dataSource: PagedDataSource[T]
+
+ def headers: Seq[Node]
+
+ def row(t: T): Seq[Node]
+
+ def table: Seq[Node] = {
+ val PageData(page, totalPages, data) = dataSource.pageData
+ <div>
+ {pageNavigation(page, totalPages)}
+ <table class={tableCssClass} id={tableId}>
+ {headers}
+ <tbody>
+ {data.map(row)}
+ </tbody>
+ </table>
+ </div>
+ }
+
+ /**
+ * Return a page navigation.
+ * <ul>
+ * <li>If the totalPages is 1, the page navigation will be empty</li>
+ * <li>
+ * If the totalPages is more than 1, it will create a page
navigation including a group of
+ * page numbers and a form to submit the page number.
+ * </li>
+ * </ul>
+ *
+ * Here are some examples of the page navigation:
+ * {{{
+ * << < 11 12 13* 14 15 16 17 18 19 20 > >>
+ *
+ * This is the first group, so "<<" is hidden.
+ * < 1 2* 3 4 5 6 7 8 9 10 > >>
+ *
+ * This is the first group and the first page, so "<<" and "<" are
hidden.
+ * 1 2* 3 4 5 6 7 8 9 10 > >>
--- End diff --
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