com.twitter.hdfsdu.TreeSizeByPathServlet.java Source code

Introduction

Here is the source code for com.twitter.hdfsdu.TreeSizeByPathServlet.java

Source

/* 
 * Copyright 2012 Twitter, Inc.
 * 
 * Licensed 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 com.twitter.hdfsdu;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.json.simple.JSONObject;

import com.google.common.collect.Lists;
import com.twitter.hdfsdu.data.DataTransformer;
import com.twitter.hdfsdu.data.NodeData;

public class TreeSizeByPathServlet extends SizeByPathServlet {
    @Override
    public Iterable<String> getLines(HttpServletRequest request) {
        String paramPath = request.getParameter("path");
        if (paramPath == null) {
            paramPath = "/";
        }
        List<String> lines = Lists.newLinkedList();
        List<NodeData> elems = Lists.newArrayList();
        Integer paramDepth = request.getParameter("depth") == null ? 2
                : Integer.parseInt(request.getParameter("depth"));

        try {
            ResultSet resultSet = getSizeByPath(request);
            NodeData data;
            while (resultSet.next()) {
                data = new NodeData();
                data.fileSize = resultSet.getString("size_in_bytes");
                data.nChildren = resultSet.getLong("file_count");
                data.path = resultSet.getString("path");
                data.leaf = resultSet.getBoolean("leaf");
                elems.add(data);
            }
            JSONObject jsonObject = DataTransformer.getJSONTree(paramPath, paramDepth, elems);

            String ans = null;
            if (jsonObject != null) {
                ans = jsonObject.toJSONString();
            }

            if (ans == null) {
                lines.add("{ \"children\": [] }");
            } else {
                lines.add(ans);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return lines;
    }
}