Perform valve isolation trace

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Sample viewer app

Run a filtered trace to locate operable features that will isolate an area from the flow of network resources.

screenshot

Use case

Determine the set of operable features required to stop a network's resource, effectively isolating an area of the network. For example, you can choose to return only accessible and operable valves: ones that are not paved over or rusted shut.

How to use the sample

Select one or more features to use as filter barriers or create and set the configuration's filter barriers by selecting a category. Check or uncheck 'Include isolated features'. Press 'Trace' to run a subnetwork-based isolation trace. Press 'Reset' to clear filter barriers.

How it works

Create a MapView and connect to its mouseClicked signal.
Create and load a ServiceGeodatabase with a feature service URL and get tables with their layer IDs.
Create a Map that contains FeatureLayer(s) created from the ServiceGeodatabase's tables.
Create and load a UtilityNetwork with the feature service URL and the Map.
Add a GraphicsOverlay with a Graphic that represents the starting location, and another graphics overlay for the filter barriers.
Populate the list of filter barrier categories from UtilityNetworkDefinition::categories.
When the map view is clicked, identify which features are at that location and add a graphic that represents a filter barrier.
Create a UtilityElement for the identified feature and add this utility element to a list of filter barriers.
- If the element is a junction with more than one terminal, display a terminal picker. Then set the junction's terminal property with the selected terminal.
- If an edge, set its fractionAlongEdge property using GeometryEngine::fractionAlong.
When "Trace" is pressed:
- Create UtilityTraceParameters with UtilityTraceType::Isolation and a starting location from a given asset type and global ID.
- Set the UtilityTraceParameters::traceConfiguration property from a default UtilityTraceConfiguration. Set the filter property with an UtilityTraceFilter object.
If 'Trace' is clicked without filter barriers:

Create a new UtilityCategoryComparison with the selected category and UtilityCategoryComparisonOperator::Exists.
Create a new UtilityTraceFilter with this condition as Barriers to set Filter and update IncludeIsolatedFeatures properties of the default configuration from step 5.
Run UtilityNetwork::trace.

If Trace is clicked with filter barriers:

Update IncludeIsolatedFeatures property of the default configuration from step 5.
Run UtilityNetwork::trace.

For every FeatureLayer in the map, select the features returned by featuresForElementsAsync from the elements matching their NetworkSource::name with the layer's FeatureTable::name.

Relevant API

GeometryEngine::fractionAlong
ServiceGeodatabase
UtilityCategory
UtilityCategoryComparison
UtilityCategoryComparisonOperator
UtilityDomainNetwork
UtilityElement
UtilityElementTraceResult
UtilityNetwork
UtilityNetworkDefinition
UtilityTerminal
UtilityTier
UtilityTraceFilter
UtilityTraceParameters
UtilityTraceResult
UtilityTraceType

About the data

The Naperville gas network feature service, hosted on ArcGIS Online (authentication required: this is handled within the sample code), contains a utility network used to run the isolation trace shown in this sample.

Additional information

Using utility network on ArcGIS Enterprise 10.8 requires an ArcGIS Enterprise member account licensed with the Utility Network user type extension. Please refer to the utility network services documentation.

Credentials:

Username: viewer01
Password: I68VGU^nMurF

Sample Code

PerformValveIsolationTrace.cpp

PerformValveIsolationTrace.h

TerminalPickerView.qml

PerformValveIsolationTrace.qml

Use dark colors for code blocksCopy
// [WriteFile Name=PerformValveIsolationTrace, Category=UtilityNetwork]
// [Legal]
// Copyright 2020 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

// sample headers
#include "PerformValveIsolationTrace.h"

// ArcGIS Maps SDK headers
#include "ArcGISFeature.h"
#include "ArcGISFeatureListModel.h"
#include "Credential.h"
#include "Error.h"
#include "FeatureLayer.h"
#include "GeometryEngine.h"
#include "Graphic.h"
#include "GraphicListModel.h"
#include "GraphicsOverlay.h"
#include "GraphicsOverlayListModel.h"
#include "IdentifyLayerResult.h"
#include "LayerListModel.h"
#include "Map.h"
#include "MapQuickView.h"
#include "MapTypes.h"
#include "Point.h"
#include "Polyline.h"
#include "QueryParameters.h"
#include "ServiceFeatureTable.h"
#include "ServiceGeodatabase.h"
#include "SimpleMarkerSymbol.h"
#include "SimpleRenderer.h"
#include "SymbolTypes.h"
#include "UtilityAssetGroup.h"
#include "UtilityAssetType.h"
#include "UtilityCategory.h"
#include "UtilityCategoryComparison.h"
#include "UtilityDomainNetwork.h"
#include "UtilityElement.h"
#include "UtilityElementTraceResult.h"
#include "UtilityNetwork.h"
#include "UtilityNetworkDefinition.h"
#include "UtilityNetworkListModel.h"
#include "UtilityNetworkSource.h"
#include "UtilityNetworkTypes.h"
#include "UtilityTerminal.h"
#include "UtilityTerminalConfiguration.h"
#include "UtilityTier.h"
#include "UtilityTraceConfiguration.h"
#include "UtilityTraceFilter.h"
#include "UtilityTraceParameters.h"
#include "UtilityTraceResultListModel.h"

// Qt headers
#include <QFuture>
#include <QUuid>

// Other headers
#include "TaskCanceler.h"

using namespace Esri::ArcGISRuntime;

namespace
{
const QString featureServiceUrl = QStringLiteral("https://sampleserver7.arcgisonline.com/server/rest/services/UtilityNetwork/NapervilleGas/FeatureServer");
const QString domainNetworkName = QStringLiteral("Pipeline");
const QString tierName = QStringLiteral("Pipe Distribution System");
const QString networkSourceName = QStringLiteral("Gas Device");
const QString assetGroupName = QStringLiteral("Meter");
const QString assetTypeName = QStringLiteral("Customer");
const QString globalId = QStringLiteral("{98A06E95-70BE-43E7-91B7-E34C9D3CB9FF}");
const QString sampleServer7Username = QStringLiteral("viewer01");
const QString sampleServer7Password = QStringLiteral("I68VGU^nMurF");
}

namespace
{
// Convenient RAII template struct that deletes all pointers in a given container.
template <typename T>
struct ScopedCleanup
{
  ScopedCleanup(const QList<T*>& list) : results(list) { }
  ~ScopedCleanup() { qDeleteAll(results); }
  const QList<T*>& results;
};
}

PerformValveIsolationTrace::PerformValveIsolationTrace(QObject* parent /* = nullptr */):
  QObject(parent),
  m_map(new Map(BasemapStyle::ArcGISStreetsNight, this)),
  m_cred(new Credential{sampleServer7Username, sampleServer7Password, this}),
  m_startingLocationOverlay(new GraphicsOverlay(this)),
  m_filterBarriersOverlay(new GraphicsOverlay(this)),
  m_serviceGeodatabase(new ServiceGeodatabase(featureServiceUrl, m_cred, this)),
  m_graphicParent(new QObject()),
  m_taskCanceler(std::make_unique<TaskCanceler>())
{
  // disable UI while loading service geodatabase and utility network
  m_tasksRunning = true;

  connect(m_serviceGeodatabase, &ServiceGeodatabase::doneLoading, this, [this](const Error& error)
  {
    if (m_utilityNetwork->loadStatus() == LoadStatus::Loaded)
    {
      // re-enable UI if both service geodatabase and utility network are loaded
      m_tasksRunning = false;
      emit tasksRunningChanged();
    }

    if (!error.isEmpty())
      return;

    // obtain service feature tables from the service geodatabase
    ServiceFeatureTable* lineLayerTable = m_serviceGeodatabase->table(3);
    ServiceFeatureTable* deviceLayerTable = m_serviceGeodatabase->table(0);

    // create feature layers from the service feature tables
    FeatureLayer* lineLayer = new FeatureLayer(lineLayerTable, this);
    FeatureLayer* deviceLayer = new FeatureLayer(deviceLayerTable, this);

    // add the feature layers to the map
    m_map->operationalLayers()->append(lineLayer);
    m_map->operationalLayers()->append(deviceLayer);
  });
  m_serviceGeodatabase->load();

  // Create and add the utility network to the map before loading
  m_utilityNetwork = new UtilityNetwork(featureServiceUrl, m_map, m_cred, this);
  m_map->utilityNetworks()->append(m_utilityNetwork);

  connectSignals();

  m_utilityNetwork->load();
}

PerformValveIsolationTrace::~PerformValveIsolationTrace() = default;

void PerformValveIsolationTrace::init()
{
  // Register the map view for QML
  qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
  qmlRegisterType<PerformValveIsolationTrace>("Esri.Samples", 1, 0, "PerformValveIsolationTraceSample");
}

MapQuickView* PerformValveIsolationTrace::mapView() const
{
  return m_mapView;
}

// Set the view (created in QML)
void PerformValveIsolationTrace::setMapView(MapQuickView* mapView)
{
  if (!mapView || mapView == m_mapView)
    return;

  m_mapView = mapView;
  m_mapView->setMap(m_map);

  connect(m_mapView, &MapQuickView::mouseClicked, this, [this](QMouseEvent& mouseEvent)
  {
    if (m_map->loadStatus() != LoadStatus::Loaded)
      return;

    constexpr double tolerance = 10.0;
    constexpr bool returnPopups = false;
    m_clickPoint = m_mapView->screenToLocation(mouseEvent.position().x(), mouseEvent.position().y());
    m_taskCanceler->addTask(m_mapView->identifyLayersAsync(mouseEvent.position(), tolerance, returnPopups).then(this, [this](const QList<IdentifyLayerResult*>& results)
    {
      // handle the identify results
      onIdentifyLayersCompleted_(results);
    }));
  });

  // apply renderers
  SimpleMarkerSymbol* startingPointSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle::Cross, Qt::green, 25, this);
  m_startingLocationOverlay->setRenderer(new SimpleRenderer(startingPointSymbol, this));

  SimpleMarkerSymbol* filterBarrierSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle::X, Qt::red, 25, this);
  m_filterBarriersOverlay->setRenderer(new SimpleRenderer(filterBarrierSymbol, this));

  m_mapView->graphicsOverlays()->append(m_startingLocationOverlay);
  m_mapView->graphicsOverlays()->append(m_filterBarriersOverlay);

  emit mapViewChanged();
}

QStringList PerformValveIsolationTrace::categoriesList() const
{
  if (!m_utilityNetwork)
    return { };

  if (m_utilityNetwork->loadStatus() != LoadStatus::Loaded)
    return { };

  const QList<UtilityCategory*> categories = m_utilityNetwork->definition()->categories();
  QStringList strList;
  for (UtilityCategory* category : categories)
  {
    strList << category->name();
  }
  return strList;
}

void PerformValveIsolationTrace::performTrace()
{
  if (m_selectedIndex < 0)
    return;

  // disable UI while trace is run
  m_tasksRunning = true;
  emit tasksRunningChanged();

  for (Layer* layer : *m_map->operationalLayers())
  {
    // clear previous selection from the feature layers
    FeatureLayer* featureLayer = dynamic_cast<FeatureLayer*>(layer);
   if (featureLayer)
     featureLayer->clearSelection();
  }

  const QList<UtilityCategory*> categories = m_utilityNetwork->definition()->categories();

  // get the selected utility category
  if (categories[m_selectedIndex] != nullptr)
  {
    // set whether to include isolated features
    m_traceConfiguration->setIncludeIsolatedFeatures(m_isolateFeatures);

    UtilityTraceParameters* traceParameters = new UtilityTraceParameters(UtilityTraceType::Isolation, QList<UtilityElement*> {m_startingLocation}, this);
    traceParameters->setTraceConfiguration(m_traceConfiguration);

    // reset trace configuration filter barriers
    m_traceConfiguration->setFilter(new UtilityTraceFilter(this));

    // set the user selected filter barriers otherwise
    // set the category comparison to the barriers of the configuration's trace filter
    if (!m_filterBarriers.empty())
      traceParameters->setFilterBarriers(m_filterBarriers);
    else
    {
      UtilityCategory* selectedCategory = categories[m_selectedIndex];
      UtilityCategoryComparison* categoryComparison = new UtilityCategoryComparison(selectedCategory, UtilityCategoryComparisonOperator::Exists, this);
      traceParameters->traceConfiguration()->filter()->setBarriers(categoryComparison);
    }

    m_taskCanceler->addTask(m_utilityNetwork->traceAsync(traceParameters).then(this, [this](QList<UtilityTraceResult*>)
    {
      onTraceCompleted_();
    }));
  }
}

void PerformValveIsolationTrace::onTraceCompleted_()
{
  // local paret to clean up UtilityElementTraceResult when we leave scope.
  QObject localParent;

  m_tasksRunning = false;
  emit tasksRunningChanged();

  UtilityTraceResultListModel* utilityTraceResultList = m_utilityNetwork->traceResult();

  if (utilityTraceResultList->isEmpty())
  {
    m_noResults = true;
    emit noResultsChanged();
    return;
  }

  UtilityElementTraceResult* utilityElementTraceResult = dynamic_cast<UtilityElementTraceResult*>(utilityTraceResultList->at(0));
  if (utilityElementTraceResult)
  {
    // given local parent to clean up once we leave scope
    utilityElementTraceResult->setParent(&localParent);

    const QList<UtilityElement*> utilityElementList = utilityElementTraceResult->elements(this);

    // A convenience wrapper that deletes the contents of utilityElementList when we leave scope.
    ScopedCleanup<UtilityElement> utilityElementListCleanUp(utilityElementList);

    if (utilityElementList.empty())
    {
      m_noResults = true;
      emit noResultsChanged();
      return;
    }

    // iterate through the map's features
    for (Layer* layer : *m_map->operationalLayers())
    {
      FeatureLayer* featureLayer = dynamic_cast<FeatureLayer*>(layer);
      if (featureLayer)
      {
        // create query parameters to find features whose network source names match layer's feature table name
        QueryParameters queryParameters;
        QList<qint64> objectIds = {};

        for (UtilityElement* utilityElement : utilityElementList)
        {
          const QString networkSourceName = utilityElement->networkSource()->name();
          const QString featureTableName = featureLayer->featureTable()->tableName();
          if (networkSourceName == featureTableName)
            objectIds.append(utilityElement->objectId());
        }
        queryParameters.setObjectIds(objectIds);
        m_taskCanceler->addTask(featureLayer->selectFeaturesAsync(queryParameters, SelectionMode::New));
      }
    }
  }
}

void PerformValveIsolationTrace::performReset()
{
  m_filterBarriersOverlay->graphics()->clear();
  m_filterBarriers.clear();
  m_traceConfiguration->setFilter(new UtilityTraceFilter(this));
  m_graphicParent.reset(new QObject());

  for (Layer* layer : *m_map->operationalLayers())
  {
    // clear previous selection from the feature layers
    FeatureLayer* featureLayer = dynamic_cast<FeatureLayer*>(layer);
   if (featureLayer)
     featureLayer->clearSelection();
  }
}

void PerformValveIsolationTrace::connectSignals()
{
  connect(m_utilityNetwork, &UtilityNetwork::doneLoading, this, [this](const Error& error)
  {
    if (m_serviceGeodatabase->loadStatus() == LoadStatus::Loaded)
    {
      // re-enable UI if both service geodatabase and utility network are loaded
      m_tasksRunning = false;
      emit tasksRunningChanged();
    }

    if (!error.isEmpty())
    {
      qDebug() << error.message() << error.additionalMessage();
      return;
    }

    if (m_utilityNetwork->loadStatus() != LoadStatus::Loaded)
      return;

    // get a trace configuration from a tier
    UtilityNetworkDefinition* networkDefinition = m_utilityNetwork->definition();
    UtilityDomainNetwork* domainNetwork = networkDefinition->domainNetwork(domainNetworkName);
    if (domainNetwork)
    {
      UtilityTier* tier = domainNetwork->tier(tierName);
      if (tier)
        m_traceConfiguration = tier->defaultTraceConfiguration();
    }

    if (!m_traceConfiguration)
      return;

    // create a trace filter
    m_traceConfiguration->setFilter(new UtilityTraceFilter(this));

    // get a default starting location
    UtilityNetworkSource* networkSource = networkDefinition->networkSource(networkSourceName);
    if (networkSource)
    {
      UtilityAssetGroup* assetGroup = networkSource->assetGroup(assetGroupName);
      if (assetGroup)
      {
        UtilityAssetType* assetType = assetGroup->assetType(assetTypeName);
        if (assetType)
          m_startingLocation = m_utilityNetwork->createElementWithAssetType(assetType, QUuid(globalId), nullptr, this);
      }
    }

    if (!m_startingLocation)
      return;

    // display starting location
    m_taskCanceler->addTask(m_utilityNetwork->featuresForElementsAsync(QList<UtilityElement*> {m_startingLocation}).then(this, [this](QList<ArcGISFeature*>)
    {
      // display starting location
      ArcGISFeatureListModel* elementFeaturesList = m_utilityNetwork->featuresForElementsResult();
      const Point startingLocationGeometry = geometry_cast<Point>(elementFeaturesList->first()->geometry());
      Graphic* graphic = new Graphic(startingLocationGeometry, m_graphicParent.get());
      m_startingLocationOverlay->graphics()->append(graphic);

      constexpr double scale = 3000.0;
      m_taskCanceler->addTask(m_mapView->setViewpointCenterAsync(startingLocationGeometry, scale));
      m_tasksRunning = false;
      emit tasksRunningChanged();
    }));

    // populate the combo box choices
    m_categoriesList = categoriesList();
    emit categoriesListChanged();
  });
}

bool PerformValveIsolationTrace::noResults() const
{
  return m_noResults;
}

bool PerformValveIsolationTrace::tasksRunning() const
{
  return m_tasksRunning;
}

void PerformValveIsolationTrace::onIdentifyLayersCompleted_(const QList<IdentifyLayerResult*>& results)
{
  // A convenience wrapper that deletes the contents of results when we leave scope.
  ScopedCleanup<IdentifyLayerResult> resultsScopedCleanup(results);

  // could not identify location
  if (results.isEmpty())
    return;

  const IdentifyLayerResult* result = results[0];
  ArcGISFeature* feature = static_cast<ArcGISFeature*>(std::as_const(result)->geoElements()[0]);
  m_element = m_utilityNetwork->createElementWithArcGISFeature(feature);

  const UtilityNetworkSourceType elementSourceType = m_element->networkSource()->sourceType();

  if (elementSourceType == UtilityNetworkSourceType::Junction)
  {
    const QList<UtilityTerminal*> terminals = m_element->assetType()->terminalConfiguration()->terminals();

    if (terminals.size() > 1)
    {
      m_terminals.clear();
      for (UtilityTerminal* terminal : terminals)
      {
        m_terminals.append(terminal->name());
      }
      emit terminalsChanged();
      return;
    }
  }
  else if (elementSourceType == UtilityNetworkSourceType::Edge)
  {
    if (feature->geometry().geometryType() == GeometryType::Polyline)
    {
      const Polyline line = geometry_cast<Polyline>(GeometryEngine::removeZ(feature->geometry()));
      // Set how far the element is along the edge.
      const double fraction = GeometryEngine::fractionAlong(line, m_clickPoint, -1);
      m_element->setFractionAlongEdge(fraction);
    }
  }

  m_filterBarriersOverlay->graphics()->append(new Graphic(m_clickPoint, m_graphicParent.get()));
  m_filterBarriers.append(m_element);
}

void PerformValveIsolationTrace::selectedTerminal(int index)
{
  UtilityTerminal* selectedTerminal = m_element->assetType()->terminalConfiguration()->terminals().at(index);
  m_element->setTerminal(selectedTerminal);

  m_filterBarriersOverlay->graphics()->append(new Graphic(m_clickPoint, m_graphicParent.get()));
  m_filterBarriers.append(m_element);
}