@comunica/mediator-combine-pipeline

Comunica Mediator Sequential

A comunica mediator that goes over all actors in sequence and forwards I/O. This requires the action input and the actor output to be of the same type.

This module is part of the Comunica framework, and should only be used by developers that want to build their own query engine.

Click here if you just want to query with Comunica.

Install

$ yarn add @comunica/mediator-sequential

Configure

After installing, this mediator can be instantiated as follows:

{
  "@context": [
    ...
    "https://linkedsoftwaredependencies.org/bundles/npm/@comunica/mediator-combine-pipeline/^1.0.0/components/context.jsonld"  
  ],
  "actors": [
    ...
    {
      "@type": "SomeActor",
      "someMediator": {
        "@id": "config-sets:sparql-init.json#mediatorOptimizeQueryOperation",
        "@type": "MediatorCombinePipeline",
        "cc:Mediator/bus": { "@id": "cboqo:Bus/OptimizeQueryOperation" }
      }
    }
  ]
}

Config Parameters

• cc:Mediator/bus: Identifier of the bus to mediate over.

Changelog

v1.20.0 - 2021-03-30

Added

• Add support for SPARQL Update queries
  • Add update actors to all init engines
  • Support update queries in SPARQL endpoint
  • Support update results in simple serializer
  • Add readOnly context entry that makes update actors fail
  • Allow single source in context to be inherited as destination
  • Add add, copy, and move update operation actors
  • Add create update operation
  • Add clear and drop update operations
  • Configure load update actor
  • Add load update query operation actor
  • Add fallback rdf-dereference actor
  • Run SPARQL Update test suite
  • Enable passing destination via the CLI
  • Configure INSERT and DELETE actors
  • Add composite update operation actor
  • Add INSERT/DELETE operation actor
  • Add RDF update actor that handles RDF/JS stores
  • Add bus for handling quad updates
  • Add update query operation output type
• Enable worker threads in SPARQL endpoints
• Delegate link queue creation to the new link queue bus

Changed

• Move public query engine interfaces into @comunica/types
• Move all context keys to '@comunica/context-entries'
• Keep track of parent link when pushing into link queue
• Save original query in context

Fixed

• Enable blank node correlation across results, Closes #795
• Fix FROM/FROM NAMED not always restricting views
• Bump asyncjoin with close on undefined fix, Closes #791
• Fix process hanging if a source parsing action rejects, Closes #786
• Fix hypermedia quad pattern resolver not skipping links to itself

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