initial commit

.gitignore

@@ -0,0 +1,3 @@
+/build
+.idea
+.gradle

AGENTS.md

@@ -0,0 +1,4 @@
+# AGENTS.md 
+
+## Dev environment tips
+- Use yml format instead of *.properties 

README.md

@@ -1,2 +1,54 @@
 # EventProducer
 
+Spring Boot starter application that publishes JSON events to RabbitMQ topic exchanges (no stream plugins required). The project uses Spring Boot 4.0.2 with Java 21.
+
+## Prerequisites
+- JDK 21 or newer
+- Locally running RabbitMQ broker reachable at the host/port set in `src/main/resources/application.yml`
+
+## Useful Commands
+- `./gradlew bootRun` — start the application
+- `./gradlew test` — run the test suite
+- `./gradlew build` — create an executable jar in `build/libs`
+
+## Configuration
+- RabbitMQ connection + exchange name are defined in `application.yml`. Override via the exposed environment variables below or your own profile files.
+- All messages are sent to the configured topic exchange; routing keys come from the request path.
+
+| Environment Variable | Default | Description |
+| --- | --- | --- |
+| `RABBITMQ_HOST` | `mit.loc` | Broker hostname |
+| `RABBITMQ_PORT` | `5672` | Broker port |
+| `RABBITMQ_USERNAME` | `producer` | Username for broker auth |
+| `RABBITMQ_PASSWORD` | `producer` | Password for broker auth |
+| `RABBITMQ_EXCHANGE` | `dev.insurance.health.request` | Topic exchange the producer targets |
+| `RABBITMQ_QUEUE` | `dev.insurance.health.request.queue` | Queue bound to the topic exchange |
+| `RABBITMQ_ROUTING_KEY` | `dev.insurance.health.request.route` | Default routing key for `/api/events/messages` |
+
+## Sending Events
+```
+curl --request POST http://localhost:8080/api/events/orders.created \
+  --header 'Content-Type: application/json' \
+  --data '{
+    "eventType": "order-created",
+    "payload": {
+      "orderId": "12345",
+      "total": 42.50
+    }
+  }'
+```
+
+## Sending Simple Messages
+```
+curl --request POST http://localhost:8080/api/events/messages \
+  --header 'Content-Type: application/json' \
+  --data '{
+    "message": "hello topic queue"
+  }'
+```
+
+## API Docs
+- OpenAPI JSON: `http://localhost:8080/api-docs`
+- Swagger UI: `http://localhost:8080/swagger-ui`
+
+> If you ever remove the Gradle wrapper, run `gradle wrapper` once (requires Gradle locally) so that subsequent builds can use `./gradlew`.

build.gradle

@@ -0,0 +1,33 @@
+plugins {
+    id 'java'
+    id 'org.springframework.boot' version '4.0.2'
+    id 'io.spring.dependency-management' version '1.1.7'
+}
+
+group = 'de.dev089'
+version = '0.0.1-SNAPSHOT'
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation 'org.springframework.boot:spring-boot-starter'
+    implementation 'org.springframework.boot:spring-boot-starter-web'
+    implementation 'org.springframework.boot:spring-boot-starter-amqp'
+    implementation 'org.springframework.boot:spring-boot-starter-validation'
+    implementation 'com.fasterxml.jackson.core:jackson-databind'
+    implementation 'org.springdoc:springdoc-openapi-starter-webmvc-ui:2.6.0'
+
+    testImplementation 'org.springframework.boot:spring-boot-starter-test'
+}
+
+tasks.named('test') {
+    useJUnitPlatform()
+}

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.0.0-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,251 @@
+#!/bin/sh
+
+#
+# Copyright © 2015 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH="\\\"\\\""
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

@@ -0,0 +1 @@
+rootProject.name = 'event-producer'

src/main/java/de/dev089/eventproducer/EventProducerApplication.java

@@ -0,0 +1,14 @@
+package de.dev089.eventproducer;
+
+import org.springframework.amqp.rabbit.annotation.EnableRabbit;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@EnableRabbit
+@SpringBootApplication
+public class EventProducerApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(EventProducerApplication.class, args);
+    }
+}

src/main/java/de/dev089/eventproducer/config/RabbitConfiguration.java

@@ -0,0 +1,55 @@
+package de.dev089.eventproducer.config;
+
+import org.springframework.amqp.core.Binding;
+import org.springframework.amqp.core.BindingBuilder;
+import org.springframework.amqp.core.Queue;
+import org.springframework.amqp.core.QueueBuilder;
+import org.springframework.amqp.core.TopicExchange;
+import org.springframework.amqp.rabbit.connection.ConnectionFactory;
+import org.springframework.amqp.rabbit.core.RabbitTemplate;
+import org.springframework.amqp.support.converter.JacksonJsonMessageConverter;
+import org.springframework.amqp.support.converter.MessageConverter;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class RabbitConfiguration {
+
+    @Value("${rabbit.producer.exchange}")
+    private String producerExchange;
+
+    @Value("${rabbit.producer.queue}")
+    private String queueName;
+
+    @Value("${rabbit.producer.routing-key}")
+    private String routingKey;
+
+    @Bean
+    public TopicExchange topicExchange() {
+        return new TopicExchange(producerExchange, true, false);
+    }
+
+    @Bean
+    public Queue producerQueue() {
+        return QueueBuilder.durable(queueName).build();
+    }
+
+    @Bean
+    public Binding queueBinding(Queue producerQueue, TopicExchange topicExchange) {
+        return BindingBuilder.bind(producerQueue).to(topicExchange).with(routingKey);
+    }
+
+    @Bean
+    public MessageConverter jacksonConverter() {
+        return new JacksonJsonMessageConverter();
+    }
+
+    @Bean
+    public RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory, MessageConverter jacksonConverter) {
+        RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory);
+        rabbitTemplate.setMessageConverter(jacksonConverter);
+        rabbitTemplate.setExchange(producerExchange);
+        return rabbitTemplate;
+    }
+}

src/main/java/de/dev089/eventproducer/producer/TopicEventProducer.java

@@ -0,0 +1,28 @@
+package de.dev089.eventproducer.producer;
+
+import org.springframework.amqp.rabbit.core.RabbitTemplate;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+@Component
+public class TopicEventProducer {
+
+    private final RabbitTemplate rabbitTemplate;
+    private final String defaultRoutingKey;
+
+    public TopicEventProducer(
+            RabbitTemplate rabbitTemplate,
+            @Value("${rabbit.producer.routing-key}") String defaultRoutingKey
+    ) {
+        this.rabbitTemplate = rabbitTemplate;
+        this.defaultRoutingKey = defaultRoutingKey;
+    }
+
+    public void publish(String routingKey, Object payload) {
+        rabbitTemplate.convertAndSend(routingKey, payload);
+    }
+
+    public void publishToDefaultQueue(Object payload) {
+        rabbitTemplate.convertAndSend(defaultRoutingKey, payload);
+    }
+}

src/main/java/de/dev089/eventproducer/web/EventController.java

@@ -0,0 +1,52 @@
+package de.dev089.eventproducer.web;
+
+import de.dev089.eventproducer.producer.TopicEventProducer;
+import de.dev089.eventproducer.web.dto.EventRequest;
+import de.dev089.eventproducer.web.dto.MessageRequest;
+import org.springframework.http.HttpStatus;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.time.Instant;
+import java.util.HashMap;
+import java.util.Map;
+
+@RestController
+@RequestMapping("/api/events")
+public class EventController {
+
+    private final TopicEventProducer topicEventProducer;
+
+    public EventController(TopicEventProducer topicEventProducer) {
+        this.topicEventProducer = topicEventProducer;
+    }
+
+    @PostMapping("/messages")
+    @ResponseStatus(HttpStatus.ACCEPTED)
+    public void publishMessage(@Validated @RequestBody MessageRequest request) {
+        Map<String, Object> envelope = new HashMap<>();
+        envelope.put("message", request.message());
+        envelope.put("sentAt", Instant.now().toString());
+
+        topicEventProducer.publishToDefaultQueue(envelope);
+    }
+
+    @PostMapping("/{routingKey}")
+    @ResponseStatus(HttpStatus.ACCEPTED)
+    public void publish(
+            @PathVariable String routingKey,
+            @Validated @RequestBody EventRequest request
+    ) {
+        Map<String, Object> envelope = new HashMap<>();
+        envelope.put("eventType", request.eventType());
+        envelope.put("payload", request.payload());
+        envelope.put("sentAt", Instant.now().toString());
+
+        topicEventProducer.publish(routingKey, envelope);
+    }
+}

src/main/java/de/dev089/eventproducer/web/dto/EventRequest.java

@@ -0,0 +1,11 @@
+package de.dev089.eventproducer.web.dto;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+
+import java.util.Map;
+
+public record EventRequest(
+        @NotBlank String eventType,
+        @NotNull Map<String, Object> payload
+) { }

src/main/java/de/dev089/eventproducer/web/dto/MessageRequest.java

@@ -0,0 +1,6 @@
+package de.dev089.eventproducer.web.dto;
+
+import jakarta.validation.constraints.NotBlank;
+
+public record MessageRequest(@NotBlank String message) {
+}

src/main/resources/application.yml

@@ -0,0 +1,20 @@
+spring:
+  application:
+    name: event-producer
+  rabbitmq:
+    host: ${RABBITMQ_HOST}
+    port: ${RABBITMQ_PORT}
+    username: ${RABBITMQ_USERNAME}
+    password: ${RABBITMQ_PASSWORD}
+
+rabbit:
+  producer:
+    exchange: dev.insurance.health.request
+    queue: dev.insurance.health.request.queue
+    routing-key: dev.insurance.health.request.route
+
+springdoc:
+  swagger-ui:
+    path: /swagger-ui
+  api-docs:
+    path: /api-docs

src/test/java/de/dev089/eventproducer/EventProducerApplicationTests.java

@@ -0,0 +1,12 @@
+package de.dev089.eventproducer;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class EventProducerApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+}