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Chapter 101. 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>

<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>

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101.1. URI Format
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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

flink:dataset?dataset=#myDataSet&dataSetCallback=#dataSetCallback
flink:datastream?datastream=#myDataStream&dataStreamCallback=#dataStreamCallback

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FlinkEndpoint Options

The Apache Flink endpoint is configured using URI syntax:

flink:endpointType

flink:endpointType

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with the following path and query parameters:

101.1.1. Path Parameters (1 parameters):
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Name	Description	Default	Type
endpointType	Required Type of the endpoint (dataset, datastream).		EndpointType

101.1.2. Query Parameters (6 parameters):
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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

101.2. FlinkComponent Options
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The Apache Flink component supports 5 options which are listed below.

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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

101.3. Flink DataSet Callback
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@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 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);
            }
        }
    };
}

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101.4. Flink DataStream Callback
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@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");
        }
    };
}

@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");
        }
    };
}

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101.5. Camel-Flink Producer call
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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();
    }

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();
    }

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101.6. See Also
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Configuring Camel
Component
Endpoint
Getting Started

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Chapter 101. Apache Flink Component

101.1. URI Format
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101.1.1. Path Parameters (1 parameters):
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101.1.2. Query Parameters (6 parameters):
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101.2. FlinkComponent Options
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101.3. Flink DataSet Callback
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101.4. Flink DataStream Callback
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101.5. Camel-Flink Producer call
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101.6. See Also
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Dieser Inhalt ist in der von Ihnen ausgewählten Sprache nicht verfügbar.

Chapter 101. Apache Flink Component

101.1. URI FormatLink kopierenLink in die Zwischenablage kopiert!

101.1.1. Path Parameters (1 parameters):Link kopierenLink in die Zwischenablage kopiert!

101.1.2. Query Parameters (6 parameters):Link kopierenLink in die Zwischenablage kopiert!

101.2. FlinkComponent OptionsLink kopierenLink in die Zwischenablage kopiert!

101.3. Flink DataSet CallbackLink kopierenLink in die Zwischenablage kopiert!

101.4. Flink DataStream CallbackLink kopierenLink in die Zwischenablage kopiert!

101.5. Camel-Flink Producer callLink kopierenLink in die Zwischenablage kopiert!

101.6. See AlsoLink kopierenLink in die Zwischenablage kopiert!

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Testen, kaufen und verkaufen

Communitys

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101.1. URI Format
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101.1.1. Path Parameters (1 parameters):
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101.1.2. Query Parameters (6 parameters):
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101.2. FlinkComponent Options
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101.3. Flink DataSet Callback
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101.4. Flink DataStream Callback
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101.5. Camel-Flink Producer call
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101.6. See Also
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