AGSGeoprocessingTask Class Reference

Description

A task to perform Geoprocessing.

Instances of this class represent a Geoprocessing Task that is used to invoke tasks on a remote ArcGIS Geoprocessing Service. Geoprocessing Services host one or more tasks that allow you to automate your GIS workflows such as spatial analysis and data management.

Since

100

Inheritance diagram for AGSGeoprocessingTask:

Instance Methods
(void)	- cancelLoad
(id< AGSCancelable >)	- defaultGeoprocessingParametersWithCompletion:
(void)	- doCancelLoading
(void)	- doStartLoading:
(AGSGeoprocessingJob *)	- geoprocessingJobWithParameters:
(instancetype)	- initWithURL:
(void)	- loadDidFinishWithError:
(void)	- loadWithCompletion:
(void)	- onLoadStatusChanged
(void)	- retryLoadWithCompletion:

Class Methods
(instancetype)	+ geoprocessingTaskWithURL:

Properties
AGSCredential *	credential
AGSGeoprocessingTaskInfo *	geoprocessingTaskInfo
NSError *	loadError
AGSLoadStatus	loadStatus
AGSRequestConfiguration *	requestConfiguration
NSURL *	URL

Method Documentation

cancelLoad

- (void) 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

defaultGeoprocessingParametersWithCompletion:

- (id<AGSCancelable>) defaultGeoprocessingParametersWithCompletion:

(void(^)(AGSGeoprocessingParameters *__nullable geoprocessingParams, NSError *__nullable error))

completion

doCancelLoading

- (void) doCancelLoading

Never call this method directly. The framework calls this method on a background thread when cancelLoad (AGSLoadable-p) is called. It is meant to be overriden by subclasses. Subclasses should override this method to cancel loading their data and call loadDidFinishWithError: (AGSLoadableBase(ForSubclassEyesOnly)) at the end passing in an error representing NSUserCancelledError.

Since

100

Provided by category AGSLoadableBase(ForSubclassEyesOnly).

doStartLoading:

- (void) doStartLoading:

(BOOL)

retrying

Never call this method directly. The framework calls this method on a background thread when loadWithCompletion: (AGSLoadable-p) or retryLoadWithCompletion: (AGSLoadable-p) is called. It is meant to be overriden by subclasses. Subclasses should override this method to load their data and call loadDidFinishWithError: (AGSLoadableBase(ForSubclassEyesOnly)) upon completion, passing in the error if any.

Parameters

retrying

flag that is true if this method was called from retryLoadWithCompletion: (AGSLoadable-p).

Since

100

Provided by category AGSLoadableBase(ForSubclassEyesOnly).

geoprocessingJobWithParameters:

- (AGSGeoprocessingJob*) geoprocessingJobWithParameters:

(AGSGeoprocessingParameters *)

parameters

Returns a job which can be used to execute geoprocessing tasks The result of the job will be of type AGSGeoprocessingResult.

Note

The job is dormant and needs to be explicitly started using startWithStatusHandler:completion: (AGSGeoprocessingJob)

Parameters

parameters

specifying inputs for the geoprocessing job

Returns

job representing the progress on the server. The result of the job will be of type AGSGeoprocessingResult

Since

100

geoprocessingTaskWithURL:

+ (instancetype) geoprocessingTaskWithURL:

(NSURL *)

URL

Initialize a geoprocessing task with a URL to a task on a remote ArcGIS Geoprocessing service.

Parameters

URL	to a task on a remote ArcGIS Geoprocessing service. For example, http://sampleserver2.arcgisonline.com/ArcGIS/rest/services/Elevation/ESRI_Elevation_World/GPServer/ProfileService

Returns

intialized geoprocessing task

Since

100

initWithURL:

- (instancetype) initWithURL:

(NSURL *)

URL

Initialize a geoprocessing task with a URL to a task on a remote ArcGIS Geoprocessing service.

Parameters

URL	to a task on a remote ArcGIS Geoprocessing service. For example, http://sampleserver2.arcgisonline.com/ArcGIS/rest/services/Elevation/ESRI_Elevation_World/GPServer/ProfileService

Returns

intialized geoprocessing task

Since

100

loadDidFinishWithError:

- (void) loadDidFinishWithError:

(nullable NSError *)

error

Only subclasses should call this method in doStartLoading: (AGSLoadableBase(ForSubclassEyesOnly)) and doCancelLoading (AGSLoadableBase(ForSubclassEyesOnly)) when done loading or failed to load.

Since

100

Provided by category AGSLoadableBase(ForSubclassEyesOnly).

loadWithCompletion:

- (void) loadWithCompletion: (nullable void(^)(NSError *__nullable error))  completion

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

- cancelLoad to cancel loading

- retryLoadWithCompletion: to force reload

onLoadStatusChanged

- (void) onLoadStatusChanged

Never call this method directly. The framework calls this method on a background thread when AGSLoadable::loadStatus changes is called. Subclasses can optionally implement this to know when their loading status has changed.

Since

100

Provided by category AGSLoadableBase(ForSubclassEyesOnly).

retryLoadWithCompletion:

- (void) retryLoadWithCompletion: (nullable void(^)(NSError *__nullable error))  completion

requiredinherited

Tries to reload when an object has failed to load. This method should be called judiciously. It should be called when:

1. you didn't have network connectivity earlier when it failed and you want to retry now that you have connectivity
2. the server was down earlier when it failed and you want to retry
3. the request is taking too long and you want to cancel it and retry, in which case you will first call cancelLoad and 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

Property Documentation

credential

- (AGSCredential*) credential

readwritenonatomicstronginherited

Security credentials to access the remote resource. Only applicable if the resource is secured.

Since

100

geoprocessingTaskInfo

- (AGSGeoprocessingTaskInfo*) geoprocessingTaskInfo

readnonatomicstrong

Metadata about the geoprocessing task and the inputs that the service expects.

Since

100.1

loadError

- (NSError*) loadError

readnonatomicstronginherited

The error that was encountered during the most recent load operation. Will be nil if the operation succeeded.

Since

100

loadStatus

- (AGSLoadStatus) loadStatus

readrequirednonatomicassigninherited

Status of the load operation.

Since

100

requestConfiguration

- (AGSRequestConfiguration*) 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

URL

- (NSURL*) URL

readrequirednonatomicstronginherited

The URL of the remote resource.

Since

100