io.smallrye.mutiny.groups

Class MultiFlatten<I,O>

java.lang.Object

io.smallrye.mutiny.groups.MultiFlatten<I,O>

Type Parameters:

I - the type of item emitted by the upstream Multi

O - the type of item emitted by the returned Multi

public class MultiFlatten<I,O>
extends Object

The object to tune the flatMap operation

Method Summary

Modifier and Type	Method and Description
MultiFlatten<I,O>	collectFailures() Instructs the flatMap operation to consume all the streams returned by the mapper before propagating a failure if any of the stream has produced a failure.
Multi<O>	concatenate() Produces a Multi containing the items from Publisher produced by the mapper for each item emitted by this Multi.
Multi<O>	merge() Produces a Multi containing the items from Publisher produced by the mapper for each item emitted by this Multi.
Multi<O>	merge(int concurrency) Produces a Multi containing the items from Publisher produced by the mapper for each item emitted by this Multi.
MultiFlatten<I,O>	withRequests(int req) Configures the number the items requested to the streams produced by the mapper.

Methods inherited from class java.lang.Object

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

Method Detail

collectFailures

public MultiFlatten<I,O> collectFailures()

Instructs the flatMap operation to consume all the streams returned by the mapper before propagating a failure if any of the stream has produced a failure.

If more than one failure is collected, the propagated failure is a CompositeException.

Returns:

this MultiFlatten

withRequests

public MultiFlatten<I,O> withRequests(int req)

Configures the number the items requested to the streams produced by the mapper.

Parameters:

req - the request, must be strictly positive

Returns:

this MultiFlatten

merge

public Multi<O> merge()

Produces a Multi containing the items from Publisher produced by the mapper for each item emitted by this Multi.

The operators behaves as follows:

• for each item emitted by this Multi, the mapper is called and produces a Publisher (potentially a Multi). The mapper must not return null
• The items contained in each of the produced Publisher are then merged in the produced Multi. The returned object lets you configure the flattening process.

Returns:

the object to configure the flatMap operation.

merge

public Multi<O> merge(int concurrency)

Produces a Multi containing the items from Publisher produced by the mapper for each item emitted by this Multi.

The operators behaves as follows:

• for each item emitted by this Multi, the mapper is called and produces a Publisher (potentially a Multi). The mapper must not return null
• The items contained in each of the produced Publisher are then merged in the produced Multi. The returned object lets you configure the flattening process.

This method allows configuring the concurrency, i.e. the maximum number of in-flight/subscribed inner streams

Parameters:

concurrency - the concurrency

Returns:

the object to configure the flatMap operation.

concatenate

public Multi<O> concatenate()

Produces a Multi containing the items from Publisher produced by the mapper for each item emitted by this Multi.

The operators behaves as follows:

• for each item emitted by this Multi, the mapper is called and produces a Publisher (potentially a Multi). The mapper must not return null
• The items contained in each of the produced Publisher are then concatenated in the produced Multi. The returned object lets you configure the flattening process.

Returns:

the object to configure the concatMap operation.