Interface BatchingDescriptor<ElementT,ElementResultT,RequestT,ResponseT> (2.19.0)

Version 2.19.0

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public interface BatchingDescriptor<ElementT,ElementResultT,RequestT,ResponseT>

An adapter that packs and unpacks the elements in and out of batch requests and responses.

This interface should be implemented by either a service specific client or autogenerated by gapic-generator.

Example implementation:

 class ListDescriptor implements BatchingDescriptor<String, String, List<String>, List<String>> {

   RequestBuilder<String, List<String>> newRequestBuilder(List<String> prototype) {
     return new RequestBuilder<String, List<String>>() {

       void add(String element) {
         list.add(element);
       }

       List<String> build() {
         return list.clone();
       }
     };
   }

   void splitResponse(List<String> callableResponse, List<SettableApiFuture<String>> batch) {
     for (int i = 0; i < batchresponse.size();="" i++)="" {="" batch.get(i).set(batchresponse.get(i);="" }="" }="" void="" splitexception(throwable="" throwable,="" list<settableapifuture<string>>="" batch)="" {="" for="" (settableapifuture<string>="" result="" :="" batch)="" {="" result.setexception(throwable);="" }="" }="" long="" countbytes(string="" element)="" {="" return="" element.length();="" }="" }="">

Type Parameters

Name	Description
ElementT
ElementResultT
RequestT
ResponseT

Methods

countBytes(ElementT element)

public abstract long countBytes(ElementT element)

Returns the size of the passed element object in bytes.

Parameter

Name	Description
element	ElementT

Returns

Type	Description
long

newRequestBuilder(RequestT prototype)

public abstract BatchingRequestBuilder<ElementT,RequestT> newRequestBuilder(RequestT prototype)

Creates a new wrapper for the underlying request builder. It's used to pack the current batch request with elements.

Parameter

Name	Description
prototype	RequestT

Returns

Type	Description
BatchingRequestBuilder<ElementT,RequestT>

splitException(Throwable throwable, List<BatchEntry<ElementT,ElementResultT>> batch)

public abstract void splitException(Throwable throwable, List<BatchEntry<ElementT,ElementResultT>> batch)

Unpacks the batch response error into individual element errors.

Parameters

Name	Description
throwable	Throwable
batch	List<BatchEntry<ElementT,ElementResultT>>

splitResponse(ResponseT batchResponse, List<BatchEntry<ElementT,ElementResultT>> batch)

public abstract void splitResponse(ResponseT batchResponse, List<BatchEntry<ElementT,ElementResultT>> batch)

Unpacks the batch response into individual elements results.

Parameters

Name	Description
batchResponse	ResponseT
batch	List<BatchEntry<ElementT,ElementResultT>>