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Getting Started

Apache Camel in 60 Seconds

Apache Camel is an integration framework that moves and transforms data using routes. A route has:

  • A consumer (from(...)) — the starting point that creates messages.
  • One or more producers (to(...)) — steps that process or send messages.
  • An exchange — the envelope carrying a message body and headers through the route.
  • Beans — objects registered in the Camel context and referenced by name (e.g., #bean:myBean).

Routes can be written in Java DSL or YAML DSL. For full details see the Apache Camel documentation.

A Minimal Pipeline

This example loads RDF triples into a graph and lowers them to a CSV file using a Velocity template.

ChimeraResourceBean triples = new ChimeraResourceBean(
    "file://./data/input.ttl", "turtle");
ChimeraResourceBean template = new ChimeraResourceBean(
    "file://./data/template.vm", "");
getCamelContext().getRegistry().bind("triples", triples);
getCamelContext().getRegistry().bind("template", template);

from("graph://get")
    .to("graph://add?chimeraResource=#bean:triples")
    .to("mapt://rdf?template=#bean:template&basePath=./output&filename=result.csv");

- beans:
    - name: triples
      type: com.cefriel.util.ChimeraResourceBean
      properties:
        url: "file://./data/input.ttl"
        serializationFormat: "turtle"
    - name: template
      type: com.cefriel.util.ChimeraResourceBean
      properties:
        url: "file://./data/template.vm"
        serializationFormat: ""

- route:
    from:
      uri: "graph://get"
    steps:
      - to:
          uri: "graph://add"
          parameters:
            chimeraResource: "#triples"
      - to:
          uri: "mapt://rdf"
          parameters:
            template: "#template"
            basePath: "./output"
            filename: "result.csv"

What happens:

  1. graph://get creates an empty in-memory RDF graph and places it in the exchange body.
  2. graph://add loads input.ttl into the graph.
  3. mapt://rdf executes the Velocity template against the graph and writes the output to ./output/result.csv.
If you want to... Read
Understand how RDF graphs are created and stored RDF Graphs
Learn how external files, URLs, and classpath resources are referenced ChimeraResource
See all graph operations (add, query, dump, etc.) Graph Component
Use templates to transform data to/from RDF Mapping Template Component