Display a feature layer from a service using the on interaction cache feature request mode.

Use case
ServiceFeatureTable supports three request modes, which define how features are requested from the service and stored in the local table. The feature request modes have different performance characteristics. Use On interaction cache in scenarios with large amounts of infrequently edited data.
How to use the sample
Run the sample and pan and zoom around the map. With each interaction, features will be requested and stored in a local cache. Each subsequent interaction will display features from the cache and only request new features from the service.
How it works
- Create a
ServiceFeatureTablewith the provided URL. - Since the default request mode is
FeatureRequestMode::OnInteractionCachewe do not need to change it. - Add the table to the map using a
FeatureLayer.
Relevant API
- FeatureLayer
- FeatureRequestMode::OnInteractionCache
- ServiceFeatureTable
- ServiceFeatureTable::setFeatureRequestMode
About the data
This sample displays a Pool permit feature layer in Riverside, California, displaying which parcels do not have pool permits.
Additional information
On interaction cache is the default feature request mode. Features are requested automatically for the visible extent as the users pans and zooms the map. If the user returns to an area where features have previously been requested, those features won’t be requested again.
Tags
cache, feature request mode, performance
Sample Code
// [WriteFile Name=ServiceFeatureTableCache, Category=Features]// [Legal]// Copyright 2016 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 "ServiceFeatureTableCache.h"
// ArcGIS Maps SDK headers#include "Basemap.h"#include "Envelope.h"#include "FeatureLayer.h"#include "LayerListModel.h"#include "Map.h"#include "MapQuickView.h"#include "MapTypes.h"#include "MapViewTypes.h"#include "ServiceFeatureTable.h"#include "SpatialReference.h"#include "Viewpoint.h"
// Qt headers#include <QUrl>
using namespace Esri::ArcGISRuntime;
ServiceFeatureTableCache::ServiceFeatureTableCache(QQuickItem* parent) : QQuickItem(parent){}
ServiceFeatureTableCache::~ServiceFeatureTableCache() = default;
void ServiceFeatureTableCache::init(){ qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView"); qmlRegisterType<ServiceFeatureTableCache>("Esri.Samples", 1, 0, "ServiceFeatureTableCacheSample");}
void ServiceFeatureTableCache::componentComplete(){ QQuickItem::componentComplete();
// find QML MapView component m_mapView = findChild<MapQuickView*>("mapView"); m_mapView->setWrapAroundMode(WrapAroundMode::Disabled);
// Create a map using the light gray canvas basemap m_map = new Map(BasemapStyle::ArcGISLightGray, this); m_map->setInitialViewpoint(Viewpoint(Envelope(-13075816.4047166, 4014771.46954516, -13073005.6797177, 4016869.78617381, SpatialReference(102100))));
// Set map to map view m_mapView->setMap(m_map);
// create the feature table m_featureTable = new ServiceFeatureTable(QUrl("https://sampleserver6.arcgisonline.com/arcgis/rest/services/PoolPermits/FeatureServer/0"), this);
// create the feature layer using the feature table m_featureLayer = new FeatureLayer(m_featureTable, this);
// add the feature layer to the map m_map->operationalLayers()->append(m_featureLayer);}// [WriteFile Name=ServiceFeatureTableCache, Category=Features]// [Legal]// Copyright 2016 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]
#ifndef SERVICE_FEATURE_TABLE_CACHE_H#define SERVICE_FEATURE_TABLE_CACHE_H
// Qt headers#include <QQuickItem>
namespace Esri::ArcGISRuntime{ class Map; class MapQuickView; class FeatureLayer; class ServiceFeatureTable;}
class ServiceFeatureTableCache : public QQuickItem{ Q_OBJECT
public: explicit ServiceFeatureTableCache(QQuickItem* parent = nullptr); ~ServiceFeatureTableCache() override;
void componentComplete() override; static void init();
private: Esri::ArcGISRuntime::Map* m_map = nullptr; Esri::ArcGISRuntime::MapQuickView* m_mapView = nullptr; Esri::ArcGISRuntime::FeatureLayer* m_featureLayer = nullptr; Esri::ArcGISRuntime::ServiceFeatureTable* m_featureTable = nullptr;};
#endif // SERVICE_FEATURE_TABLE_CACHE_H// [WriteFile Name=ServiceFeatureTableCache, Category=Features]// [Legal]// Copyright 2016 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]
import QtQuickimport Esri.Samples
ServiceFeatureTableCacheSample { width: 800 height: 600
// add a mapView component MapView { anchors.fill: parent objectName: "mapView"
Component.onCompleted: { // Set the focus on MapView to initially enable keyboard navigation forceActiveFocus(); } }}// [Legal]// Copyright 2015 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]
// sample headers#include "ServiceFeatureTableCache.h"
// ArcGIS Maps SDK headers#include "ArcGISRuntimeEnvironment.h"
// Qt headers#include <QCommandLineParser>#include <QDir>#include <QGuiApplication>#include <QQmlEngine>#include <QQuickView>#include <QSettings>
// Platform specific headers#ifdef Q_OS_WIN#include <Windows.h>#endif
#define STRINGIZE(x) #x#define QUOTE(x) STRINGIZE(x)
int main(int argc, char *argv[]){ Esri::ArcGISRuntime::ArcGISRuntimeEnvironment::setUseLegacyAuthentication(false); QGuiApplication app(argc, argv); app.setApplicationName(QString("ServiceFeatureTableCache"));
// Use of ArcGIS location services, such as basemap styles, geocoding, and routing services, // requires an access token. For more information see // https://links.esri.com/arcgis-runtime-security-auth.
// The following methods grant an access token:
// 1. User authentication: Grants a temporary access token associated with a user's ArcGIS account. // To generate a token, a user logs in to the app with an ArcGIS account that is part of an // organization in ArcGIS Online or ArcGIS Enterprise.
// 2. API key authentication: Get a long-lived access token that gives your application access to // ArcGIS location services. Go to the tutorial at https://links.esri.com/create-an-api-key. // Copy the API Key access token.
const QString accessToken = QString("");
if (accessToken.isEmpty()) { qWarning() << "Use of ArcGIS location services, such as the basemap styles service, requires" << "you to authenticate with an ArcGIS account or set the API Key property."; } else { Esri::ArcGISRuntime::ArcGISRuntimeEnvironment::setApiKey(accessToken); }
// Initialize the sample ServiceFeatureTableCache::init();
// Initialize application view QQuickView view; view.setResizeMode(QQuickView::SizeRootObjectToView);
// Add the import Path view.engine()->addImportPath(QDir(QCoreApplication::applicationDirPath()).filePath("qml"));
QString arcGISRuntimeImportPath = QUOTE(ARCGIS_RUNTIME_IMPORT_PATH);
#if defined(LINUX_PLATFORM_REPLACEMENT) // on some linux platforms the string 'linux' is replaced with 1 // fix the replacement paths which were created QString replaceString = QUOTE(LINUX_PLATFORM_REPLACEMENT); arcGISRuntimeImportPath = arcGISRuntimeImportPath.replace(replaceString, "linux", Qt::CaseSensitive); #endif
// Add the Runtime and Extras path view.engine()->addImportPath(arcGISRuntimeImportPath);
// Set the source view.setSource(QUrl("qrc:/Samples/Features/ServiceFeatureTableCache/ServiceFeatureTableCache.qml"));
view.show();
return app.exec();}