kotlin-spring-cloud-function-example

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kotlin-spring-cloud-function-example

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kotlin spring cloud function example

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# kotlin-spring-cloud-function-example
Kotlin spring cloud function example with different types of creation function, supplier and consumer.
This example also contains Kotlin lambdas configured as Spring beans.
There are also examples with flux - reactive type.

## Download

```bash
    git clone git@github.com:wojciech-zurek/kotlin-spring-cloud-function-example.git
```

## Run with gradle

```bash
    cd kotlin-spring-cloud-function-example/
    ./gradlew bootRun
```

## Run as jar file

```bash
    cd kotlin-spring-cloud-function-example/
    ./gradlew bootJar
    java -jar build/libs/kotlin-spring-cloud-function-example-0.0.1-SNAPSHOT.jar
```

## HTTP Endpoints example

#### /upperCase (bean, function)

```bash
    echo "Hello World" | http POST :8080/upperCase
    HTTP/1.1 200 OK
    Content-Length: 12
    Content-Type: application/json;charset=UTF-8
    accept-encoding: gzip, deflate
    connection: keep-alive
    user-agent: HTTPie/1.0.3
    
    HELLO WORLD
```

#### /lowerCase (bean, function with reactive flux)

```bash
    echo "Hello World" | http POST :8080/lowerCase
    HTTP/1.1 200 OK
    Content-Length: 17
    Content-Type: application/json;charset=UTF-8
    accept-encoding: gzip, deflate
    connection: keep-alive
    user-agent: HTTPie/1.0.3
    
    [
        "hello world\n"
    ]
```

#### /user (function with reactive flux)

```bash
    http POST :8080/user name=admin age=30
    HTTP/1.1 200 OK
    Content-Length: 34
    Content-Type: application/json;charset=UTF-8
    accept-encoding: gzip, deflate
    connection: keep-alive
    user-agent: HTTPie/1.0.3
    
    [
        {
            "age": 30,
            "id": 0,
            "name": "admin"
        }
    ]
```

#### /log (consumer)

```bash
    echo "Message to log" | http POST :8080/log
    HTTP/1.1 200 OK
    content-length: 0
```

#### /reverse (function with reactive flux)

```bash
    echo "Message to reverse" | http POST :8080/reverse
    HTTP/1.1 200 OK
    Content-Length: 24
    Content-Type: application/json;charset=UTF-8
    accept-encoding: gzip, deflate
    connection: keep-alive
    user-agent: HTTPie/1.0.3
    
    [
        "\nesrever ot egasseM"
    ]
```

#### /statistic (function)

```bash
    echo "Sample message" | http POST :8080/statistic
    HTTP/1.1 200 OK
    Content-Length: 56
    Content-Type: application/json;charset=UTF-8
    accept-encoding: gzip, deflate
    connection: keep-alive
    user-agent: HTTPie/1.0.3
    
    {
        "\n": 1,
        " ": 1,
        "a": 2,
        "e": 3,
        "g": 1,
        "l": 1,
        "m": 2,
        "p": 1,
        "s": 3
    }
```

#### /unixTime (supplier)

```bash
    http :8080/unixTime  
    HTTP/1.1 200 OK
    Content-Length: 10
    Content-Type: application/json;charset=UTF-8
    accept-encoding: gzip, deflate
    connection: keep-alive
    user-agent: HTTPie/1.0.3
    
    1571218287
```

#### /pi (Kotlin lambda bean, supplier)

```bash
    http :8080/pi            
    HTTP/1.1 200 OK
    Content-Length: 17
    Content-Type: application/json;charset=UTF-8
    accept-encoding: gzip, deflate
    connection: keep-alive
    user-agent: HTTPie/1.0.3
    
    3.141592653589793
```

#### /square (Kotlin lambda bean, function)

```bash
    echo 12 | http :8080/square
    HTTP/1.1 200 OK
    Content-Length: 3
    Content-Type: application/json;charset=UTF-8
    accept-encoding: gzip, deflate
    connection: keep-alive
    user-agent: HTTPie/1.0.3
    
    144
```

#### /stupid (Kotlin lambda bean, consumer)

```bash
    echo "Test" | http :8080/stupid
    HTTP/1.1 200 OK
    content-length: 0
```

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