# How to Run the Consumer Demo Code On Linux OS
TDengine's Consumer demo project is organized in a Maven way so that users can easily compile, package and run the project. If you don't have Maven on your server, you may install it using
```
sudo apt-get install maven
```

## Install TDengine Client and TaosAdapter
Make sure you have already installed a tdengine client on your current develop environment.
Download the tdengine package on our website: ``https://www.taosdata.com/cn/all-downloads/`` and install the client.

## Run Consumer Demo using mvn plugin
run command:
```
mvn clean compile exec:java -Dexec.mainClass="com.taosdata.ConsumerDemo"
```

## Custom configuration
```shell
# the host of TDengine server
export TAOS_HOST="127.0.0.1"

# the port of TDengine server
export TAOS_PORT="6041"

# the consumer type, can be "ws" or "jni"
export TAOS_TYPE="ws"

# the number of consumers
export TAOS_JDBC_CONSUMER_NUM="1"

# the number of processors to consume
export TAOS_JDBC_PROCESSOR_NUM="2"

# the number of records to be consumed per processor per second
export TAOS_JDBC_RATE_PER_PROCESSOR="1000"

# poll wait time in ms
export TAOS_JDBC_POLL_SLEEP="100"
```

## Run Consumer Demo using jar

To compile the demo project, go to the source directory ``TDengine/tests/examples/JDBC/consumer-demo`` and execute
```
mvn clean package assembly:single
```

To run ConsumerDemo.jar, go to ``TDengine/tests/examples/JDBC/consumer-demo`` and execute
```
java -jar target/ConsumerDemo-jar-with-dependencies.jar
```