public static void main(String[] args) throws Exception {
// Set up the execution environment
final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
// Configure the MongoDB source with a custom DeserializationSchema
MongoSource<String> mongoSource = MongoSource.<String>builder()
.setUri("your-mongodb-uri") // Replace with your MongoDB URI
.setDatabase("your-database-name") // Replace with your database name
.setCollection("your-collection-name") // Replace with your collection name
.setDeserializationSchema(new DocumentStringDeserializationSchema()) // Custom DeserializationSchema
.build();
// Create a data stream from the MongoDB source
DataStream<String> mongoStream = env.fromSource(
mongoSource,
WatermarkStrategy.noWatermarks(),
"MongoDBSource"
);
// Print the documents read from MongoDB
mongoStream.print();
// Execute the Flink job
env.execute("Flink MongoDB Read Test");
}
// Custom DeserializationSchema to convert MongoDB Document to String
public static class DocumentStringDeserializationSchema implements DeserializationSchema<String> {
@Override
public String deserialize(byte[] message) throws IOException {
Document doc = Document.parse(new String(message));
return doc.toJson();
}
@Override
public boolean isEndOfStream(String nextElement) {
return false;
}
@Override
public org.apache.flink.api.common.typeinfo.TypeInformation<String> getProducedType() {
return org.apache.flink.api.common.typeinfo.TypeInformation.of(String.class);
}
}
import org.apache.flink.api.common.eventtime.WatermarkStrategy; import org.apache.flink.api.common.serialization.DeserializationSchema; import org.apache.flink.api.common.serialization.SimpleStringSchema; import org.apache.flink.connector.mongodb.source.MongoSource; import org.apache.flink.streaming.api.datastream.DataStream; import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; import org.bson.Document;
import java.io.IOException;
public class FlinkMongoReadTest {
}