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
Geode	HTTP Request	File
HTTP	Image Recognition(Tensorflow)	FTP
JDBC	Object Detection(Tensorflow)	Geode
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
		Wavefront

Reusable Spring Cloud Stream Applications

Source	Processor	Sink
CDC Debezium	Aggregator	Analytics
File	Bridge	Cassandra
FTP	Filter	Elasticsearch
Geode	Groovy	Fiile
HTTP	Header-Enricher	FTP
JDBC	HTTP Request	Geode
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
		Wavefront
		Websocket

Build

You can build everything from the root of the repository.

Note

The build depends on the global property ${revision} to configure the current project version. This value is resolved with the maven-flatten-plugin. Because of this, you need to install some core poms in the local maven repository before running a build command. To perform this necessary step, run setup-build.sh.

./setup-build.sh

./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 build them 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 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