Getting started with the Edgent samples is a great way to start using Edgent and jump-start your Edgent application development.
See IDE Quickstart if you want use an IDE instead of the command line.
Convenience binaries (jars) for the Edgent runtime releases are distributed to the ASF Nexus Repository and the Maven Central Repository. You don't have to manually download the Edgent jars and there is no need to download the Edgent runtime sources and build them unless you want to.
By default the samples depend on Java8. Download and install Java8 if needed.
Get the Edgent Samples either by cloning or downloading the Edgent Samples GitHub repository:
git clone https://github.com/apache/incubator-edgent-samples
cd incubator-edgent-samples
git checkout developor to download:
- Open the Clone or download pulldown at the Edgent Samples GitHub repository
- Click on Download ZIP
- Unpack the downloaded ZIP
unzip incubator-edgent-samples-develop.zipcd <the cloned or unpacked samples folder>
./mvnw clean package # build for Java8cd topology
./run-sample.sh HelloEdgent # prints a hello message and terminates
Hello
Edgent!
...The Edgent samples are organized into a few categories (subdirectories) and are a collection of maven projects. They can be built using maven or other maven-integrated tooling such as Eclipse - see IDE Quickstart.
See the Samples Summary section for a list of the samples.
An Edgent application template maven project is supplied. It may be a useful starting point to clone for your application. The template has a standalone maven project pom rather than the stylized one used by the rest of the samples. See template/README.md.
See APPLICATION_DEVELOPMENT.md for general information on Edgent Application Development, Packaging and Execution.
Additional information may also be found in Getting Started https://edgent.apache.org/docs/edgent-getting-started
Once you have downloaded and unpacked the samples source bundle or cloned the the samples repository you need to download these additional development software tools.
- Java 8 - The development setup assumes Java 8
Maven is used as build tool and a maven-wrapper
script (mvwn or mvnw.bat) is included.
The maven-wrapper automatically downloads and installs the
correct Maven version and uses it. Besides this, there is no
difference between using the mvnw command and the mvn command.
The samples use Edgent SDK jars that have been released in a maven repository such as Maven Central.
Alternatively, you can download the Edgent SDK sources and build them. See downloads for downloading the Edgent SDK sources.
By default Java8 class files are generated. Java7 platform class files are produced when the appropriate profile is specified.
Currently, building and running the samples for the Android platform
is not supported. Many samples happen to use the DevelopmentProvider,
which is not supported on the Android platform.
Build the samples
./mvnw clean package # -Pplatform-java7 as neededA standard jar and uber jar are created for each sample category
in the sample category's target directory: <category>/target.
To change the version of the Edgent runtime artifacts used,
edit the edgent.runtime.version property in the top level
pom.xml. e.g.,
<edgent.runtime.version>1.3.0-SNAPSHOT</edgent.runtime.version>Note: Do NOT override the value via
./mvnw ... -Dedgent.runtime.version=<the-version>.
The build will not behave as desired.
A similar declaration is present in template/pom.xml.
When running get-edgent-jars.sh, specify --version=<the-version>.
See the README.md in each sample category directory for information
on running the samples.
HelloEdgent Basic mechanics of declaring a topology and executing
it. Prints Hello Edgent! to standard output.
TempSensorApplication A basic Edgent application used by the Edgent
"Getting Started Guide":
https://edgent.apache.org/docs/edgent-getting-started.html
PeriodicSource Create a stream by polling a random number generator
for a new value every second and then prints out the
raw tuple value and a filtered and transformed stream.
SensorAggregates Demonstrates partitioned window aggregation and
filtering of simulated sensors that are bursty in
nature, so that only intermittently is the data output
to standard output.
File Use the File stream connector to write a stream of
tuples to files. Also watch a directory for new files
and create a stream of tuples from the file contents.
Iotp Use the IBM Watson IoT Platform connector to send
simulated sensor readings to an IBM Watson IoT Platform
instance as device events. Receive device commands.
JDBC Use the JDBC stream connector to write a stream of
tuples to an Apache Derby database table. Create a
stream of tuples by reading a table.
Kafka Use the Kafka stream connector to publish a stream of
tuples to a Kafka topic. Create a stream of tuples by
subscribing to a topic and receiving messages from it.
MQTT Use the MQTT stream connector to publish a stream of
tuples to a MQTT topic. Create a stream of tuples by
subscribing to a topic and receiving messages from it.
SensorAnalytics Demonstrates a more complex sample that includes
configuration control, a device of one or more sensors
and some typical analytics, use of MQTT for publishing
results and receiving commands, local results logging,
conditional stream tracing.
Many other samples are provided but have not yet been noted above. Explore!
Apache Edgent samples are released under the Apache License Version 2.0.
Apache Edgent is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the Incubator PMC. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.