Chapter 108. Apache Flink Component Available as of Camel version 2.18 This documentation page covers the Apache Flink component for the Apache Camel. The camel-flink component provides a bridge between Camel connectors and Flink tasks. This Camel Flink connector provides a way to route message from various transports, dynamically choosing a flink task to execute, use incoming message as input data for the task and finally deliver the results back to the Camel pipeline. Maven users will need to add the following dependency to their pom.xml for this component: <dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-flink</artifactId> <version>x.x.x</version> <!-- use the same version as your Camel core version --> </dependency> 108.1. URI Format Currently, the Flink Component supports only Producers. One can create DataSet, DataStream jobs. flink:dataset?dataset=#myDataSet&dataSetCallback=#dataSetCallback flink:datastream?datastream=#myDataStream&dataStreamCallback=#dataStreamCallback FlinkEndpoint Options The Apache Flink endpoint is configured using URI syntax: with the following path and query parameters: 108.1.1. Path Parameters (1 parameters): Name Description Default Type endpointType Required Type of the endpoint (dataset, datastream). EndpointType 108.1.2. Query Parameters (6 parameters): Name Description Default Type collect (producer) Indicates if results should be collected or counted. true boolean dataSet (producer) DataSet to compute against. DataSet dataSetCallback (producer) Function performing action against a DataSet. DataSetCallback dataStream (producer) DataStream to compute against. DataStream dataStreamCallback (producer) Function performing action against a DataStream. DataStreamCallback synchronous (advanced) Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported). false boolean 108.2. Spring Boot Auto-Configuration The component supports 6 options, which are listed below. Name Description Default Type camel.component.flink.data-set DataSet to compute against. The option is a org.apache.flink.api.java.DataSet type. String camel.component.flink.data-set-callback Function performing action against a DataSet. The option is a org.apache.camel.component.flink.DataSetCallback type. String camel.component.flink.data-stream DataStream to compute against. The option is a org.apache.flink.streaming.api.datastream.DataStream type. String camel.component.flink.data-stream-callback Function performing action against a DataStream. The option is a org.apache.camel.component.flink.DataStreamCallback type. String camel.component.flink.enabled Enable flink component true Boolean camel.component.flink.resolve-property-placeholders Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders. true Boolean 108.3. FlinkComponent Options The Apache Flink component supports 5 options, which are listed below. Name Description Default Type dataSet (producer) DataSet to compute against. DataSet dataStream (producer) DataStream to compute against. DataStream dataSetCallback (producer) Function performing action against a DataSet. DataSetCallback dataStreamCallback (producer) Function performing action against a DataStream. DataStreamCallback resolveProperty Placeholders (advanced) Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders. true boolean 108.4. Flink DataSet Callback @Bean public DataSetCallback<Long> dataSetCallback() { return new DataSetCallback<Long>() { public Long onDataSet(DataSet dataSet, Object... objects) { try { dataSet.print(); return new Long(0); } catch (Exception e) { return new Long(-1); } } }; } 108.5. Flink DataStream Callback @Bean public VoidDataStreamCallback dataStreamCallback() { return new VoidDataStreamCallback() { @Override public void doOnDataStream(DataStream dataStream, Object... objects) throws Exception { dataStream.flatMap(new Splitter()).print(); environment.execute("data stream test"); } }; } 108.6. Camel-Flink Producer call CamelContext camelContext = new SpringCamelContext(context); String pattern = "foo"; try { ProducerTemplate template = camelContext.createProducerTemplate(); camelContext.start(); Long count = template.requestBody("flink:dataSet?dataSet=#myDataSet&dataSetCallback=#countLinesContaining", pattern, Long.class); } finally { camelContext.stop(); } 108.7. See Also Configuring Camel Component Endpoint Getting Started

Commands:
<dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-flink</artifactId> <version>x.x.x</version> <!-- use the same version as your Camel core version --> </dependency>
flink:dataset?dataset=#myDataSet&dataSetCallback=#dataSetCallback flink:datastream?datastream=#myDataStream&dataStreamCallback=#dataStreamCallback
flink:endpointType
@Bean public DataSetCallback<Long> dataSetCallback() { return new DataSetCallback<Long>() { public Long onDataSet(DataSet dataSet, Object... objects) { try { dataSet.print(); return new Long(0); } catch (Exception e) { return new Long(-1); } } }; }
@Bean public VoidDataStreamCallback dataStreamCallback() { return new VoidDataStreamCallback() { @Override public void doOnDataStream(DataStream dataStream, Object... objects) throws Exception { dataStream.flatMap(new Splitter()).print(); environment.execute("data stream test"); } }; }
CamelContext camelContext = new SpringCamelContext(context); String pattern = "foo"; try { ProducerTemplate template = camelContext.createProducerTemplate(); camelContext.start(); Long count = template.requestBody("flink:dataSet?dataSet=#myDataSet&dataSetCallback=#countLinesContaining", pattern, Long.class); } finally { camelContext.stop(); }