Description
A task to find facilities closest to an incident.
Instances of this class represent tasks that can find the closest facilities around any location (incidents) on a network. Finding the closest hospital to an accident, the closest police cars to a crime scene, and the closest store to a customer's address are all examples of closest facility problems. When finding closest facilities, you can specify how many to find and whether the direction of travel is toward or away from them. Once you've found the closest facilities, you can display the best route to or from them, return the travel cost for each route, and display directions to each facility. Additionally, you can specify an impedance cutoff beyond which the task should not search for a facility. For instance, you can set up a closest facility problem to search for hospitals within 15 minutes drive time of the site of an accident. Any hospitals that take longer than 15 minutes to reach will not be included in the results.
The task can be created for an ArcGIS Network Analyst service hosted in the cloud on ArcGIS Online or on-premises with ArcGIS Server.
- Since
- 100.1
- License Restrictions:
- This feature requires a Analysis extension for production deployment when using a network dataset in a local mobile geodatabase . No license required in Developer mode for testing.
Instance Methods | |
| (void) | - cancelLoad |
| (id< AGSCancelable >) | - defaultClosestFacilityParametersWithCompletion: |
| (instancetype) | - initWithDatabaseName:networkName: |
| (instancetype) | - initWithDataset: |
| (instancetype) | - initWithFileURLToDatabase:networkName: |
| (instancetype) | - initWithURL: |
| (void) | - loadWithCompletion: |
| (void) | - retryLoadWithCompletion: |
| (id< AGSCancelable >) | - solveClosestFacilityWithParameters:completion: |
Class Methods | |
| (instancetype) | + closestFacilityTaskWithDatabaseName:networkName: |
| (instancetype) | + closestFacilityTaskWithDataset: |
| (instancetype) | + closestFacilityTaskWithFileURLToDatabase:networkName: |
| (instancetype) | + closestFacilityTaskWithURL: |
Method Documentation
§ cancelLoad()
|
requiredinherited |
Cancels loading if it is in progress, otherwise it does nothing. This should be called carefully because other objects could be waiting for loadWithCompletion: or retryLoadWithCompletion: to complete and this will call them all back with the error of NSUserCancelledError
- Since
- 100
§ closestFacilityTaskWithURL:()
| + (instancetype) closestFacilityTaskWithURL: | (NSURL *) | URL |
Initialize the task with a URL to a closest facility layer in an ArcGIS Network Analyst service. The service may be hosted in the cloud on ArcGIS Online or on-premises with ArcGIS Server.
- Parameters
-
URL to a closest facility layer in an ArcGIS Network Analyst service. For example, http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Network/USA/NAServer//Closest%20Facility
- Returns
- a new closest facility task
- Since
- 100.1
§ defaultClosestFacilityParametersWithCompletion:()
| - (id<AGSCancelable>) defaultClosestFacilityParametersWithCompletion: | (void(^)(AGSClosestFacilityParameters *__nullable closestFacilityParameters, NSError *__nullable error)) | completion |
A convenience method to get properly initialized parameters for finding closest facilities. The parameters are initialized with default values based on the closestFacilityTaskInfo
- Parameters
-
completion block that is invoked when the operation completes. The closest facility parameters are populated if the operation succeeds, else the error is populated if the operation fails.
- Since
- 100.1
§ initWithURL:()
| - (instancetype) initWithURL: | (NSURL *) | URL |
Initialize the task with a URL to a closest facility layer in an ArcGIS Network Analyst service. The service may be hosted in the cloud on ArcGIS Online or on-premises with ArcGIS Server.
- Parameters
-
URL to a closest facility layer in an ArcGIS Network Analyst service. For example, http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Network/USA/NAServer/Closest%20Facility
- Returns
- a new closest facility task
- Since
- 100.1
§ loadWithCompletion:()
|
requiredinherited |
Loads data for the object asynchronously. The completion block is invoked upon completion.
You can call this method any number of times, however only one attempt is made to load the data. If it is already loading, it will just continue to load (i.e. not force a reload). If it has already loaded successfully, the completion block will be invoked right away. If it has already failed to load, the completion block will be invoked right away with error previously encountered. This method supports multiple callers and will call them all back on completion. However, each caller's completion block will be invoked once and only once.
- Parameters
-
completion block that is invoked when object loads successfully or fails to load. An error is passed to the block if the object fails to load.
- Note
- The completion block is always invoked on the main thread.
- Since
- 100
- See also
- cancelLoadto cancel loading-
- retryLoadWithCompletion:to force reload
§ retryLoadWithCompletion:()
|
requiredinherited |
Tries to reload when an object has failed to load. This method should be called judiciously. It should be called when:
- you didn't have network connectivity earlier when it failed and you want to retry now that you have connectivity
- the server was down earlier when it failed and you want to retry
- the request is taking too long and you want to cancel it and retry, in which case you will first call
cancelLoadand then this method
If the data hasn't started loading, it will start loading. If it is already loading, it will just continue to load. If it has already loaded successfully, calls back right away. If it has already failed to load, tries again. This method supports multiple callers and will call them all back on completion. However, each caller's completion block will be invoked once and only once.
- Parameters
-
completion block that is invoked when object loads successfully or fails to load. An error is passed to the block if the object fails to load.
- Note
- The completion block is always invoked on the main thread.
- Since
- 100
§ solveClosestFacilityWithParameters:completion:()
| - (id<AGSCancelable>) solveClosestFacilityWithParameters: | (AGSClosestFacilityParameters *) | closestFacilityParameters | |
| completion: | (void(^)(AGSClosestFacilityResult *__nullable closestFacilityResult, NSError *__nullable error)) | completion | |
Finds closest facilities based on the provided parameters
- Parameters
-
closestFacilityParameters based on which closest facilities should be found completion block that is invoked when the operation completes. The result is populated if the operation succeeds, else the error is populated if the operation fails.
- Since
- 100.1
Property Documentation
§ closestFacilityTaskInfo
|
readnonatomicstrong |
Metadata about the ArcGIS Network Analyst service or transportation network dataset being used by the task
- Since
- 100.1
§ credential
|
readwritenonatomicstronginherited |
Security credentials to access the remote resource. Only applicable if the resource is secured.
- Since
- 100
§ loadError
|
readnonatomicstronginherited |
The error that was encountered during the most recent load operation. Will be nil if the operation succeeded.
- Since
- 100
§ loadStatus
|
readrequirednonatomicassigninherited |
Status of the load operation.
- Since
- 100
§ requestConfiguration
|
readwritenonatomicstronginherited |
The AGSRequestConfiguration object which defines the behavior and policies to use when accessing the remote resource. The default will be nil. If it is nil the [AGSRequestConfiguration globalConfiguration] will be used.
- Since
- 100
§ transportationNetworkDataset
|
readnonatomicstrong |
The transportation network dataset being used by this task Will be nil if the task is using a service instead of a local geodatabase.
- Since
- 100.2
§ URL
|
readrequirednonatomicstronginherited |
The URL of the remote resource.
- Since
- 100
