Stream Applications

In this repository, you will find a collection of components that can meet various data integration use cases and requirements.

The repository’s primary focus is to provide a set of standalone Java functions that can be useful in the end-user applications as-is.

Besides, this repository builds on the Java functions to generate standalone Spring Cloud Stream applications that can run against Spring Cloud Stream’s RabbitMQ or Apache Kafka binder implementations. It is also possible to extend the generator to bundle the Java functions with the other supported binder implementations.

These applications can run standalone or as part of a data flow, such as the one orchestrated using Spring Cloud Data Flow.

Project Structure

The repository includes two major sections - Functions and Applications. The former hosts the various Java functions, and the latter is for generating the standalone Spring Cloud Stream applications and hosting their related components.

The following are the various components of this repository.

• Standalone Java Functions

• Common Core Components for Applications

• Spring Cloud Stream Applications

• Build Parent

• Release Train

Reusable Functions

java.util.Supplier	java.util.Function	java.util.Consumer
CDC Debezium	Aggregator	Analytics
File	Filter	Cassandra
FTP	Header-Enricher	Elasticsearch
	HTTP Request	File
HTTP	Image Recognition(Tensorflow)	FTP
JDBC	Object Detection(Tensorflow)
JMS	Semantic Segmentation(Tensorflow)	JDBC
Mail	SpEL	Log
MongoDB	Splitter	MongoDB
MQTT	Task Launch Request	MQTT
RabbitMQ	Task Launcher	RabbitMQ
AWS S3	Twitter	Redis
SFTP		RSocket
Syslog		AWS S3
TCP		SFTP
Time		TCP
Twitter		Twitter
Websocket		Websocket
XMPP		Wavefront
		XMPP

Reusable Spring Cloud Stream Applications

Source	Processor	Sink
CDC Debezium	Aggregator	Analytics
File	Bridge	Cassandra
FTP	Filter	Elasticsearch
Groovy	Fiile	HTTP
Header-Enricher	FTP	JDBC
HTTP Request	JMS	Image Recognition(Tensorflow)
JDBC	Load-Generator	Object Detection(Tensorflow)
Log	Mail
MongoDB	MongoDB	Semantic Segmentation(Tensorflow)
MQTT	MQTT	Script
Pgcopy	RabbitMQ	Splitter
RabbitMQ	AWS S3	Transform
Redis	SFTP	Twitter Trend
Router	Syslog
RSocket	TCP
SFTP	Time
Task Launcher	Twitter Message
TCP	Twitter Search
Throughput	Twitter Stream
Twitter Message	Websocket
Twitter Update	XMPP
Wavefront
Websocket

Build

You can build everything from the root of the repository.

./mvnw clean install

Tip	By default the build skips long running tests, annotated with @Tag("integration"),including tests requiring Testcontainers. To run the full test suite, activate the integration Maven profile: ./mvnw clean install -Pintegration. This applies to building functions or individual applications as well.

However, this may not be what you are interested in since you are probably interested in a single application or a few of them. To build the functions and applications that you are interested in, you need to first build the base module with the following.

./mvnw clean install -f stream-applications-build

You can then build the desired functions/apps selectively, as shown below.

Building Functions

./mvnw clean install -f functions

You can also build a single function or group of functions. For example, if you are only interested in jdbc-supplier and log-consumer, do the following.

./mvnw clean install -pl :jdbc-supplier,:log-consumer

Building Stream Applications Core

If you want to re-run the common core build, you can build it with the following.

./mvnw clean install -f applications/stream-applications-core

Building Stream Applications

Let’s assume that you want to build a jdbc-source application based on Kafka Binder in Spring Cloud Stream and Log Sink application based on Rabbit binder.

Here is what you need to do. Assuming that you already built both functions and stream-applications-core as above,

./mvnw clean package -pl :jdbc-source
cd applications/source/jdbc-source/apps/jdbc-source-kafka
./mvnw clean package

This will generate the Kafka binder based uber jar in the target folder.

Similarly, for the log-sink, do the following.

./mvnw clean package -pl :log-sink
cd applications/sink/log-sink/apps/log-sink-rabbit
./mvnw clean package

Rebuild all applications and container images.

./local/build-images.sh

Additional Resources

Here is a list of resources where you can find out more about using and developing functions and stream applications:

• Function Composition

• Contributing a New Function or Application to this Repository

Code of Conduct

Please see our Code of Conduct