com.azure.core.util.polling

Class ChainedPollingStrategy<T,U>

java.lang.Object

com.azure.core.util.polling.ChainedPollingStrategy<T,U>

Type Parameters:

T - the type of the response type from a polling call, or BinaryData if raw response body should be kept

U - the type of the final result object to deserialize into, or BinaryData if raw response body should be kept

All Implemented Interfaces:

PollingStrategy<T,U>

public final class ChainedPollingStrategy<T,U>
extends Object
implements PollingStrategy<T,U>

A polling strategy that chains multiple polling strategies, finds the first strategy that can poll the current long running operation, and polls with that strategy.

Constructor Summary

Constructors

Constructor and Description
ChainedPollingStrategy(List<PollingStrategy<T,U>> strategies) Creates a chained polling strategy with a list of polling strategies.

Method Summary

Modifier and Type	Method and Description
Mono<T>	cancel(PollingContext<T> pollingContext, PollResponse<T> initialResponse) Cancels the long running operation if service supports cancellation.
Mono<Boolean>	canPoll(Response<?> initialResponse) Checks if this strategy is able to handle polling for this long running operation based on the information in the initial response.
Mono<U>	getResult(PollingContext<T> context, TypeReference<U> resultType) Parses the response from the final GET call into the result type of the long running operation.
Mono<PollResponse<T>>	onInitialResponse(Response<?> response, PollingContext<T> pollingContext, TypeReference<T> pollResponseType) Parses the initial response into a LongRunningOperationStatus, and stores information useful for polling in the PollingContext.
Mono<PollResponse<T>>	poll(PollingContext<T> context, TypeReference<T> pollResponseType) Parses the response from the polling URL into a PollResponse, and stores information useful for further polling and final response in the PollingContext.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ChainedPollingStrategy

public ChainedPollingStrategy(List<PollingStrategy<T,U>> strategies)

Creates a chained polling strategy with a list of polling strategies.

Parameters:

strategies - the list of polling strategies

Method Detail

canPoll

public Mono<Boolean> canPoll(Response<?> initialResponse)

Description copied from interface: PollingStrategy

Checks if this strategy is able to handle polling for this long running operation based on the information in the initial response.

Specified by:

canPoll in interface PollingStrategy<T,U>

Parameters:

initialResponse - the response from the initial method call to activate the long running operation

Returns:

true if this polling strategy can handle the initial response, false if not

getResult

public Mono<U> getResult(PollingContext<T> context,
                         TypeReference<U> resultType)

Parses the response from the final GET call into the result type of the long running operation.

Specified by:

getResult in interface PollingStrategy<T,U>

Parameters:

context - the PollingContext for the current polling operation

resultType - the TypeReference of the final result object to deserialize into, or BinaryData if raw response body should be kept.

Returns:

a publisher emitting the final result

Throws:

NullPointerException - if ChainedPollingStrategy.canPoll(Response) is not called prior to this, or if it returns false.

onInitialResponse

public Mono<PollResponse<T>> onInitialResponse(Response<?> response,
                                               PollingContext<T> pollingContext,
                                               TypeReference<T> pollResponseType)

Parses the initial response into a LongRunningOperationStatus, and stores information useful for polling in the PollingContext. If the result is anything other than LongRunningOperationStatus.IN_PROGRESS, the long running operation will be terminated and none of the other methods will be invoked.

Specified by:

onInitialResponse in interface PollingStrategy<T,U>

Parameters:

response - the response from the initial method call to activate the long running operation

pollingContext - the PollingContext for the current polling operation

pollResponseType - the TypeReference of the response type from a polling call, or BinaryData if raw response body should be kept. This should match the generic parameter U.

Returns:

a publisher emitting the poll response containing the status and the response content

Throws:

NullPointerException - if ChainedPollingStrategy.canPoll(Response) is not called prior to this, or if it returns false.

poll

public Mono<PollResponse<T>> poll(PollingContext<T> context,
                                  TypeReference<T> pollResponseType)

Parses the response from the polling URL into a PollResponse, and stores information useful for further polling and final response in the PollingContext. The result must have the LongRunningOperationStatus specified, and the entire polling response content as a BinaryData.

Specified by:

poll in interface PollingStrategy<T,U>

Parameters:

context - the PollingContext for the current polling operation

pollResponseType - the TypeReference of the response type from a polling call, or BinaryData if raw response body should be kept. This should match the generic parameter U.

Returns:

a publisher emitting the poll response containing the status and the response content

Throws:

NullPointerException - if ChainedPollingStrategy.canPoll(Response) is not called prior to this, or if it returns false.

cancel

public Mono<T> cancel(PollingContext<T> pollingContext,
                      PollResponse<T> initialResponse)

Cancels the long running operation if service supports cancellation. If service does not support cancellation then the implementer should return Mono.error with an error message indicating absence of cancellation. Implementing this method is optional - by default, cancellation will not be supported unless overridden.

Specified by:

cancel in interface PollingStrategy<T,U>

Parameters:

pollingContext - the PollingContext for the current polling operation, or null if the polling has started in a SyncPoller

initialResponse - the response from the initial operation

Returns:

a publisher emitting the cancellation response content

Throws:

NullPointerException - if ChainedPollingStrategy.canPoll(Response) is not called prior to this, or if it returns false.