Local server geoprocessing

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Create contour lines from local raster data using a local geoprocessing package .gpkx and the contour geoprocessing tool.

screenshot

Use case

For executing offline geoprocessing tasks in your ArcGIS Runtime apps via an offline (local) server.

How to use the sample

Contour Line Controls (Top Left):

  • Interval - Specifies the spacing between contour lines.
  • Generate Contours - Adds contour lines to map using interval.
  • Clear Results - Removes contour lines from map.

How it works

  1. Add raster data to map using as an ArcGISTiledLayer.
  2. Create and run the Local Server.
    • LocalServer::instance creates the Local Server.
    • LocalServer::start() starts the server asynchronously.
  3. Wait for server to be in the LocalServerStatus::Started state.
    • LocalServer::statusChanged() fires whenever the running status of the Local Server changes.
  4. Start a LocalGeoprocessingService and run a GeoprocessingTask
    • new LocalGeoprocessingService(Url, ServiceType), creates a local geoprocessing service
    • LocalGeoprocessingService::start() starts the service asynchronously.
    • new GeoprocessingTask(LocalGeoprocessingService.url() + "/Contour"), creates a geoprocessing task that uses the contour lines tool
  5. Create GeoprocessingParameters and add a GeoprocessingDouble as a parameter using set interval.
    • new GeoprocessingParameters(ExecutionType), creates geoprocessing parameters
    • inputs.insert("ContourInterval", new GeoprocessingDouble(double)), creates a parameter with name ContourInterval with the interval set as its value.
    • gpParams.setInputs(inputs), sets the input with the interval value.
  6. Create and start a GeoprocessingJob using the parameters from above.
    • GeoprocessingTask::createJob(GeoprocessingParameters), creates a geoprocessing job
    • GeoprocessingJob::start(), starts the job.
  7. Add contour lines as an ArcGISMapImageLayer to map.
    • Get url from local geoprocessing service, LocalGeoprocessingService::url()
    • Get server job id of geoprocessing job, GeoprocessingJob::serverJobId()
    • Replace GPServer from url with MapServer/jobs/jobId, to get generate contour lines data
    • create a map image layer from that new url and add that layer to the map

Relevant API

  • GeoprocessingDouble
  • GeoprocessingJob
  • GeoprocessingParameter
  • GeoprocessingParameters
  • GeoprocessingTask
  • LocalGeoprocessingService
  • LocalGeoprocessingService::serviceType
  • LocalServer
  • LocalServerStatus

Offline Data

Read more about how to set up the sample's offline data here.

Link Local Location
Contour geoprocessing package <userhome>/ArcGIS/Runtime/Data/gpkx/Contour.gpkx
Raster Hillshade TPKX <userhome>/ArcGIS/Runtime/Data/tpkx/RasterHillshade.tpkx

Additional information

Local Server can be downloaded for Windows and Linux platforms. Local Server is not supported on macOS.

Tags

geoprocessing, local, offline, parameters, processing, service

Sample Code

LocalServerGeoprocessing.cppLocalServerGeoprocessing.cppLocalServerGeoprocessing.hLocalServerGeoprocessing.qml
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// [WriteFile Name=LocalServerGeoprocessing, Category=LocalServer]
// [Legal]
// Copyright 2017 Esri.

// 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.
// [Legal]

#ifdef PCH_BUILD
#include "pch.hpp"
#endif // PCH_BUILD

#include "LocalServerGeoprocessing.h"

#include "Basemap.h"
#include "MapQuickView.h"
#include "Map.h"
#include "LocalServer.h"
#include "Viewpoint.h"
#include "TileCache.h"
#include "LocalGeoprocessingService.h"
#include "ArcGISTiledLayer.h"
#include "GeoprocessingTask.h"
#include "GeoprocessingJob.h"
#include "GeoprocessingParameter.h"
#include "GeoprocessingParameters.h"
#include "GeoprocessingDouble.h"
#include "ArcGISMapImageLayer.h"

#include <QDir>
#include <QTemporaryDir>

using namespace Esri::ArcGISRuntime;

// constructor
LocalServerGeoprocessing::LocalServerGeoprocessing(QQuickItem* parent) :
  QQuickItem(parent)
{
  // Create a temporary directory for the local server if one has not already been created
  if (!LocalServer::appDataPath().isEmpty() && !LocalServer::tempDataPath().isEmpty())
    return;

  // create temp/data path
  const QString tempPath = LocalServerGeoprocessing::shortestTempPath() + "/EsriQtTemp";

  // create the directory
  m_tempDir = std::make_unique<QTemporaryDir>(tempPath);

  // set the temp & app data path for the local server
  LocalServer::instance()->setTempDataPath(m_tempDir->path());
  LocalServer::instance()->setAppDataPath(m_tempDir->path());
}

// destructor
LocalServerGeoprocessing::~LocalServerGeoprocessing() = default;

void LocalServerGeoprocessing::init()
{
  qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
  qmlRegisterType<LocalServerGeoprocessing>("Esri.Samples", 1, 0, "LocalServerGeoprocessingSample");
}

void LocalServerGeoprocessing::componentComplete()
{
  QQuickItem::componentComplete();

  QString dataPath = QDir::homePath() + "/ArcGIS/Runtime/Data";

  // find QML MapView component
  m_mapView = findChild<MapQuickView*>("mapView");
  m_mapView->setWrapAroundMode(WrapAroundMode::Disabled);

  // Create a map using the topographic BaseMap
  m_map = new Map(BasemapStyle::ArcGISLightGray, this);

  // Set map to map view
  m_mapView->setMap(m_map);

  TileCache* tileCache = new TileCache(dataPath + "/tpkx/RasterHillshade.tpkx", this);
  m_tiledLayer = new ArcGISTiledLayer(tileCache, this);
  m_map->operationalLayers()->append(m_tiledLayer);

  // create a gp service
  m_localGPService = new LocalGeoprocessingService(dataPath + "/gpkx/Contour.gpkx", this);
  m_localGPService->setServiceType(GeoprocessingServiceType::AsynchronousSubmitWithMapServerResult);

  if (LocalServer::instance()->isInstallValid())
  {
    connectSignals();
    if (LocalServer::instance()->status() == LocalServerStatus::Started)
      m_localGPService->start();
    else
      LocalServer::start();
  }
}

void LocalServerGeoprocessing::connectSignals()
{
  connect (m_tiledLayer, &ArcGISTiledLayer::loadStatusChanged, this, [this](LoadStatus status)
  {
    if (status == LoadStatus::Loaded)
    {
      m_mapView->setViewpoint(Viewpoint(m_tiledLayer->fullExtent()));
    }
  });

  // start the gp service once local server has started
  connect(LocalServer::instance(), &LocalServer::statusChanged, this, [this]()
  {
    if (LocalServer::status() == LocalServerStatus::Started)
    {
      // start the service
      m_localGPService->start();
      m_isReady = false;
      emit isReadyChanged();
    }
  });

  // local gp service status
  connect(m_localGPService, &LocalGeoprocessingService::statusChanged, this, [this]()
  {
    if (m_localGPService->status() == LocalServerStatus::Started)
    {
      m_gpTask = new GeoprocessingTask(QUrl(m_localGPService->url().toString() + "/Contour"), this);
      m_isReady = true;
      emit isReadyChanged();
    }
  });
}

void LocalServerGeoprocessing::generateContours(double interval)
{
  m_isReady = false;
  emit isReadyChanged();
  GeoprocessingParameters gpParams(GeoprocessingExecutionType::AsynchronousSubmit);
  QMap<QString, GeoprocessingParameter*> inputs = gpParams.inputs();
  inputs.insert("ContourInterval", new GeoprocessingDouble(interval, this));
  gpParams.setInputs(inputs);

  GeoprocessingJob* gpJob = m_gpTask->createJob(gpParams);

  connect(gpJob, &GeoprocessingJob::jobDone, this, [this, gpJob]()
  {
    if (gpJob->jobStatus() == JobStatus::Succeeded)
    {
      QString url = m_localGPService->url().toString().replace("GPServer", "MapServer/jobs/" + gpJob->serverJobId());
      ArcGISMapImageLayer* mapImageLayer = new ArcGISMapImageLayer(QUrl(url), this);
      m_map->operationalLayers()->append(mapImageLayer);
      m_isReady = true;
      emit isReadyChanged();
    }
  });

  gpJob->start();
}

void LocalServerGeoprocessing::clearResults()
{
  if (m_mapView->map()->operationalLayers()->size() > 1)
    m_mapView->map()->operationalLayers()->removeAt(1);
}

QString LocalServerGeoprocessing::shortestTempPath()
{
  // get tmp and home paths
  const QString tmpPath = QDir::tempPath();
  const QString homePath = QDir::homePath();

  // return whichever is shorter, temp or home path
  if (homePath.length() > tmpPath.length())
    return tmpPath;
  else
    return homePath;
}

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