Package org.aksw.jena_sparql_api.io.endpoint

Class DestinationFromSwitch

java.lang.Object
org.aksw.jena_sparql_api.io.endpoint.DestinationFromSwitch
All Implemented Interfaces:
Destination
public class DestinationFromSwitch extends Object implements Destination
Switching destination If a file for a DestinationFromFileCreation finishes, it can replace itself with a DestinationFromFile Right now I am not sure whether this is useful: If a stream is requested, it has to do all the preparation work anyway If we think of a source + filter as a virtual source, then it is actually ok: Let's not forget that a destination is a supplier for input streams Repeatedly executing such a workflow may re-use prior generated files instead of repeating the process again from the source file However, the purpose of this framework is not to do full caching, but only abstract java and system filters, but allow controlling what should happen with the files in case they get generated. The next level of abstraction could be thought of as treating files as stores: E.g. writing a stream to HDFS and passing a reference to it to a system command
Author:
raven

  • Field Details

  • Constructor Details

    • DestinationFromSwitch

      public DestinationFromSwitch()

  • Method Details

    • getDestination

      public Destination getDestination()

    • prepareStream

      public io.reactivex.rxjava3.core.Single<InputStreamSupplier> prepareStream()
      Description copied from interface: Destination
      This method requests a supplier for inputstreams. For basic destinations, such as FileDestination, this process does not involve any overhead. However, if the destination represents a workflow, prepareStream may trigger a complex execution. The execution may generate a file from which streams can be obtained, or nothing gets executed at this point, and execution only occur when opening an input stream.
      Specified by:
      prepareStream in interface Destination
      Returns:

    • transferTo

      public FilterConfig transferTo(FilterEngine engine)
      Specified by:
      transferTo in interface Destination

    • materialize

      public io.reactivex.rxjava3.core.Single<DestinationFromFile> materialize(Supplier<Path> preferredPathCallback) throws IOException
      Description copied from interface: Destination
      Materialize the destination to a given file. If the destination is already a file it waits until it has been completed. For non-file destinations, the callback is invoked to obtain a preferred file name
      Specified by:
      materialize in interface Destination
      Returns:
      Throws:
      IOException

    • getCreationStatus

      public String getCreationStatus()
      Description copied from interface: Destination
      Get a description of the creation status.
      Specified by:
      getCreationStatus in interface Destination
      Returns: