datahub/wherehows-api/app/controllers/api/v1/Lineage.java

/**
 * Copyright 2015 LinkedIn Corp. All rights reserved.
 *
 * 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.
 */
package controllers.api.v1;

import com.fasterxml.jackson.databind.node.ObjectNode;
import dao.DatasetsDAO;
import dao.FlowsDAO;
import dao.LineageDAO;
import play.Play;
import play.libs.Json;
import play.mvc.Controller;
import play.mvc.Result;
import play.Logger;
import org.apache.commons.lang3.StringUtils;

public class Lineage extends Controller
{
    private static final String LINEAGE_LOOK_BACK_TIME_KEY = "lineage.look.back.time";

    public static Result getDatasetLineageGraphData(int id)
    {
        ObjectNode result = Json.newObject();
        String username = session("user");
        if (id < 1)
        {
            result.put("status", "error");
            result.put("message", "wrong dataset id");
            return ok(result);
        }

        models.Dataset dataset = DatasetsDAO.getDatasetByID(id, username);
        if (dataset == null || StringUtils.isBlank(dataset.urn))
        {
            result.put("status", "error");
            result.put("message", "wrong dataset id");
            return ok(result);
        }

        int upLevel = 1;
        String upLevelStr = request().getQueryString("upLevel");
        if (StringUtils.isBlank(upLevelStr))
        {
            upLevel = 1;
        }
        else
        {
            try
            {
                upLevel = Integer.parseInt(upLevelStr);
            }
            catch(NumberFormatException e)
            {
                Logger.error("Lineage Controller getDatasetLineageGraphData wrong upLevel parameter. Error message: "
                        + e.getMessage());
                upLevel = 1;
            }
        }
        if (upLevel < 1)
            upLevel = 1;

        int downLevel = 1;
        String downLevelStr = request().getQueryString("downLevel");
        if (StringUtils.isBlank(downLevelStr))
        {
            downLevel = 1;
        }
        else
        {
            try
            {
                downLevel = Integer.parseInt(downLevelStr);
            }
            catch(NumberFormatException e)
            {
                Logger.error("Lineage Controller getDatasetLineageGraphData wrong downLevel parameter. Error message: "
                        + e.getMessage());
                downLevel = 1;
            }
        }
        if (downLevel < 1)
            downLevel = 1;

        int lookBackTimeDefault = Integer.valueOf(Play.application().configuration().getString(LINEAGE_LOOK_BACK_TIME_KEY, "30"));
        int lookBackTime = lookBackTimeDefault;
        String lookBackTimeStr = request().getQueryString("period");
        if (!StringUtils.isBlank(lookBackTimeStr))
        {
          try
          {
            lookBackTime = Integer.parseInt(lookBackTimeStr);
          }
          catch(NumberFormatException e)
          {
            Logger.error("Lineage Controller getDatasetLineageGraphData wrong period parameter. Error message: "
                + e.getMessage());
            lookBackTime = lookBackTimeDefault;
          }
        }

        result.put("status", "ok");
        result.set("data", Json.toJson(LineageDAO.getObjectAdjacnet(dataset.urn, upLevel, downLevel, lookBackTime)));
        return ok(result);
    }

    public static Result getFlowLineageGraphData(String application, String project, Long flowId)
    {
        ObjectNode result = Json.newObject();

        result.put("status", "ok");
        result.set("data", Json.toJson(LineageDAO.getFlowLineage(application, project, flowId)));
        return ok(result);
    }

}