RequestBatch

open class RequestBatch : ObjectBase

Encapsulates an OData batch request.

See also

ChangeSet, DataQuery, DataService.processBatch.

Example using proxy classes

open func processBatchExample() throws -> Void {
    let service = self.service
    let supplier1 = try service.fetchSupplier(matching: DataQuery().top(1))
    let supplier2 = supplier1.copy()
    let supplier3 = supplier1.copy()
    let supplier4 = supplier1.copy()
    supplier2.companyName = "Alpha Inc."
    supplier3.companyName = "Beta Inc."
    try service.createEntity(supplier2)
    try service.createEntity(supplier3)
    supplier3.companyName = "Gamma Inc."
    let product1 = try service.fetchProduct(matching: DataQuery().top(1))
    let product2 = product1.copy()
    product2.productName = "Delta Cake"
    let batch = RequestBatch()
    let changes = ChangeSet()
    changes.createEntity(supplier4)
    changes.updateEntity(supplier3)
    changes.deleteEntity(supplier2)
    changes.createEntity(product2)
    changes.createLink(from: product2, property: Product.supplier, to: supplier4)
    changes.updateLink(from: product2, property: Product.supplier, to: supplier3)
    changes.deleteLink(from: product2, property: Product.supplier, to: supplier3)
    let query = DataQuery().from(NorthwindServiceMetadata.EntitySets.suppliers)
    batch.addChanges(changes)
    batch.addQuery(query)
    try service.processBatch(batch)
    let suppliers = try Supplier.array(from: batch.queryResult(for: query)
        .entityList())
    try Example.show("There are now ", Example.formatInt(suppliers.count), " suppliers.")
}

Example using dynamic API

open func processBatchExample() throws -> Void {
    let service = self.service
    let suppliersEntitySet = service.entitySet(withName: "Suppliers")
    let productsEntitySet = service.entitySet(withName: "Products")
    let supplierEntityType = suppliersEntitySet.entityType
    let companyNameProperty = supplierEntityType.property(withName: "CompanyName")
    let productEntityType = productsEntitySet.entityType
    let productNameProperty = productEntityType.property(withName: "ProductName")
    let supplierProperty = productEntityType.property(withName: "Supplier")
    let supplier1 = try service.executeQuery(DataQuery().from(suppliersEntitySet)
        .top(1))
        .requiredEntity()
    let supplier2 = supplier1.copyEntity()
    let supplier3 = supplier1.copyEntity()
    let supplier4 = supplier1.copyEntity()
    companyNameProperty.setStringValue(in: supplier2, to: "Alpha Inc.")
    companyNameProperty.setStringValue(in: supplier3, to: "Beta Inc.")
    try service.createEntity(supplier2)
    try service.createEntity(supplier3)
    companyNameProperty.setStringValue(in: supplier3, to: "Gamma Inc.")
    let product1 = try service.executeQuery(DataQuery().from(productsEntitySet)
        .top(1))
        .requiredEntity()
    let product2 = product1.copyEntity()
    productNameProperty.setStringValue(in: product2, to: "Delta Cake")
    let batch = RequestBatch()
    let changes = ChangeSet()
    changes.createEntity(supplier4)
    changes.updateEntity(supplier3)
    changes.deleteEntity(supplier2)
    changes.createEntity(product2)
    changes.createLink(from: product2, property: supplierProperty, to: supplier4)
    let query = DataQuery().from(suppliersEntitySet)
    batch.addChanges(changes)
    batch.addQuery(query)
    try service.processBatch(batch)
    let suppliers = try batch.queryResult(for: query).entityList()
    try Example.show("There are now ", Example.formatInt(suppliers.length), " suppliers.")
}

continueOnError
Should the server continue executing all requests in a batch if one or more of the requests returns an error status. Defaults to true.
Declaration
Swift

final public var continueOnError: Bool
init()
Default initializer.
Declaration
Swift

override public init()


                      
                      
                      action(at:)

Declaration

Swift

open func action(at index: Int) -> DataQuery

Parameters


                                  index

From zero to size - 1

Return Value

The DataQuery for an action call, if isAction(index) is true; otherwise throws undefined.


                      
                      
                      actionResult(for:at:)

Declaration

Swift

open func actionResult(for call: DataQuery, at index: Int = Int(Int32.min)) -> QueryResult

Parameters

`call`	`DataQuery` containing the action call.
`index`	From zero to `size - 1`. Index for the query. Omit if unknown, in which case the query will be located by a linear search.

Return Value

The QueryResult for an action call.


                      
                      
                      addAction(call:headers:options:)

Add an action call to this request batch.

Example using proxy classes

open func invokeActionsInBatch() throws -> Void {
    let service = self.service
    let batch = RequestBatch()
    let action1 = DataQuery()
    let action2 = DataQuery()
    try service.deleteVideosInCategory("Romance", query: action1.deferExecution())
    try service.deleteVideosInCategory("Suspense", query: action2.deferExecution())
    batch.addAction(call: action1)
    batch.addAction(call: action2)
    try service.processBatch(batch)
    batch.checkActionResult(for: action1)
    batch.checkActionResult(for: action2)
}

Declaration

Swift

open func addAction(call: DataQuery, headers: HTTPHeaders? = nil, options: RequestOptions? = nil)

Parameters

`call`	Query with non-null `DataQuery.methodCall` for an action method.
`headers`	Action call headers.
`options`	Action call options.


                      
                      
                      addChanges(_:headers:options:)

Add a change set to this request batch.

Declaration

Swift

open func addChanges(_ changes: ChangeSet, headers: HTTPHeaders? = nil, options: RequestOptions? = nil)

Parameters

`changes`	Change set.
`headers`	Change set headers.
`options`	Change set options.


                      
                      
                      addFunction(call:headers:options:)

Add a function call to this request batch.

Example using proxy classes

open func invokeFunctionsInBatch() throws -> Void {
    let service = self.service
    let batch = RequestBatch()
    let query1 = DataQuery()
    let query2 = DataQuery()
    _ = try service.videosInCategory("Romance", query: query1.deferExecution())
    _ = try service.videosInCategory("Suspense", query: query2.deferExecution())
    batch.addFunction(call: query1)
    batch.addFunction(call: query2)
    try service.processBatch(batch)
    let videos1 = try Video.array(from: batch.functionResult(for: query1)
        .entityList())
    let videos2 = try Video.array(from: batch.functionResult(for: query2)
        .entityList())
    self.showVideos(videos1)
    self.showVideos(videos2)
}

Declaration

Swift

open func addFunction(call: DataQuery, headers: HTTPHeaders? = nil, options: RequestOptions? = nil)

Parameters

`call`	Query with non-null `DataQuery.methodCall` for a function method.
`headers`	Function call headers.
`options`	Function call options.


                      
                      
                      addQuery(_:headers:options:)

Add a data query to this request batch.

Declaration

Swift

open func addQuery(_ query: DataQuery, headers: HTTPHeaders? = nil, options: RequestOptions? = nil)

Parameters

`query`	Data query.
`headers`	Data query headers.
`options`	Data query options.


                      
                      
                      addQueryResult(query:result:index:)

Add a query result to this request batch.

Declaration

Swift

open func addQueryResult(query: DataQuery, result: QueryResult, index: Int = Int(Int32.min))

Parameters

`query`	Data query, which must have been previously added to this batch using `addQuery`.
`index`	From zero to `size - 1`. Index for the query. Omit if unknown, in which case the query will be located by a linear search.
`result`	Query result.


                      
                      
                      changeSet(at:)

Declaration

Swift

open func changeSet(at index: Int) -> ChangeSet

Parameters


                                  index

From zero to size - 1.

Return Value

The change set, if isChangeSet(index) is true; otherwise throws undefined.


                      
                      
                      checkActionResult(for:at:)

Call QueryResult.check on the QueryResult for an action call. Throws DataServiceException if the action failed.

Declaration

Swift

open func checkActionResult(for call: DataQuery, at index: Int = Int(Int32.min))

Parameters

`call`	`DataQuery` containing the action call.
`index`	From zero to `size - 1`. Index for the query. Omit if unknown, in which case the query will be located by a linear search.


                      
                      
                      dataQuery(at:)

Declaration

Swift

open func dataQuery(at index: Int) -> DataQuery

Parameters


                                  index

From zero to size - 1.

Return Value

The data query, if isDataQuery(index) is true; otherwise throws undefined.


                      
                      
                      downloadMedia(entity:headers:options:)

Add a “download media” query to the batch, to obtain a stream for downloading the content of a media entity from the target system. Caution: streams are often used for large content that may not fit (all at once) in available application memory. Having too many threads simultaneously downloading streams, or using ByteStream.readAndClose, may result in out-of-memory conditions on memory-constrained devices.

See also

QueryResult.getByteStream, QueryResult.getCharStream.

Declaration

Swift

open func downloadMedia(entity: EntityValue, headers: HTTPHeaders? = nil, options: RequestOptions? = nil) -> DataQuery

Parameters

`entity`	Entity whose content is to be downloaded.
`headers`	Request-specific headers.
`options`	Request-specific options.

Return Value

A data query representing the media download request.


                      
                      
                      downloadStream(entity:link:headers:options:)

Add a “download stream” query to the batch, to obtain a stream for downloading the content of a stream property from the target system. Caution: streams are often used for large content that may not fit (all at once) in available application memory. Having too many threads simultaneously downloading streams, or using ByteStream.readAndClose, may result in out-of-memory conditions on memory-constrained devices.

See also

QueryResult.getByteStream, QueryResult.getCharStream.

Declaration

Swift

open func downloadStream(entity: EntityValue, link: StreamLink, headers: HTTPHeaders? = nil, options: RequestOptions? = nil) -> DataQuery

Parameters

`entity`	Entity containing the stream property whose content is to be downloaded.
`link`	Stream link for the stream to be downloaded.
`headers`	Request-specific headers.
`options`	Request-specific options.

Return Value

A data query representing the stream download request.


                      
                      
                      error

Error if status does not represent a successful response.

Declaration

Swift

@inline(__always)
public final var error: DataServiceError? { get set }


                      
                      
                      function(at:)

Declaration

Swift

open func function(at index: Int) -> DataQuery

Parameters


                                  index

From zero to size - 1

Return Value

The DataQuery for a function call, if isFunction(index) is true; otherwise throws undefined.


                      
                      
                      functionResult(for:at:)

Declaration

Swift

open func functionResult(for call: DataQuery, at index: Int = Int(Int32.min)) -> QueryResult

Parameters

`call`	`DataQuery` containing the function call.
`index`	From zero to `size - 1`. Index for the query. Omit if unknown, in which case the query will be located by a linear search.

Return Value

The QueryResult for a function call.


                      
                      
                      headers(at:)

Declaration

Swift

open func headers(at index: Int) -> HTTPHeaders

Parameters


                                  index

From zero to size - 1.

Return Value

The HTTP headers for the request at index.


                      
                      
                      invokeFunction(method:parameters:headers:options:)

Add a function call to the batch.

See also

DataQuery.bind and DataQuery.from, for setting the binding parameter for a bound function (either can be applied to the returned query).

Declaration

Swift

open func invokeFunction(method: DataMethod, parameters: ParameterList = ParameterList.empty, headers: HTTPHeaders? = nil, options: RequestOptions? = nil) -> DataQuery

Parameters

`method`	Function to be called.
`parameters`	Function call parameters.
`headers`	Function call headers.
`options`	Function call options.

Return Value

A data query representing the function call.


                      
                      
                      isAction(at:)

Declaration

Swift

open func isAction(at index: Int) -> Bool

Parameters


                                  index

From zero to size - 1

Return Value

true if index is a valid change index, and the request at that index is for an action call.


                      
                      
                      isChangeSet(at:)

Declaration

Swift

open func isChangeSet(at index: Int) -> Bool

Parameters


                                  index

From zero to size - 1.

Return Value

true if index is a valid request index, and the request at that index is a ChangeSet; otherwise false.


                      
                      
                      isDataQuery(at:)

Declaration

Swift

open func isDataQuery(at index: Int) -> Bool

Parameters


                                  index

From zero to size - 1.

Return Value

true if index is a valid request index, and the request at that index is a DataQuery; otherwise false.


                      
                      
                      isFunction(at:)

Declaration

Swift

open func isFunction(at index: Int) -> Bool

Parameters


                                  index

From zero to size - 1

Return Value

true if index is a valid change index, and the request at that index is for a function call.


                      
                      
                      options(at:)

Declaration

Swift

open func options(at index: Int) -> RequestOptions

Parameters


                                  index

From zero to size - 1.

Return Value

The request options for the request at index.


                      
                      
                      queryResult(for:index:)

See also

addQuery.

Declaration

Swift

open func queryResult(for query: DataQuery, index: Int = Int(Int32.min)) -> QueryResult

Parameters

`query`	Data query.
`index`	From zero to `size - 1`. Index for the query. Omit if unknown, in which case the query will be located by a linear search.

Return Value

The result of a data query within this batch.


                      
                      
                      replaceHeaders(at:headers:)

Replace the request headers for a previously added request.

Declaration

Swift

open func replaceHeaders(at index: Int, headers: HTTPHeaders)

Parameters

`index`	From zero to `size - 1`.
`headers`	Updated request headers.


                      
                      
                      replaceOptions(at:options:)

Replace the request options for a previously added request.

Declaration

Swift

open func replaceOptions(at index: Int, options: RequestOptions)

Parameters

`index`	From zero to `size - 1`.
`options`	Updated request options.

size
The number of requests in this request batch.
Declaration
Swift

open var size: Int { get }
status
Response status (e.g. HTTP status code 200 = OK).
Declaration
Swift

@inline(__always) public final var status: Int { get set }