mirror of https://github.com/dapr/quickstarts.git
91 lines
2.7 KiB
Markdown
91 lines
2.7 KiB
Markdown
# Dapr Configuration API
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In this quickstart, you'll create a microservice which makes use of Dapr's Configuration API. Configuration items are key/value pairs containing configuration data such as app ids, partition keys, database names etc. The service gets configuration items from the configuration store and subscribes for configuration updates.
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Visit [this](https://docs.dapr.io/developing-applications/building-blocks/configuration/) link for more information about Dapr and Configuration API.
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> **Note:** This example leverages HTTP `requests` only. If you are looking for the example using the Dapr Client SDK (recommended) [click here](../sdk/).
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This quickstart includes one service:
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- Java service `order-processor`
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## Prerequisites
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- [Maven 3.x](https://maven.apache.org/install.html)
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- Java JDK 17 (or greater):
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- [Microsoft JDK 17](https://learn.microsoft.com/en-us/java/openjdk/download#openjdk-17)
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- [Oracle JDK 17](https://www.oracle.com/java/technologies/downloads/?er=221886#java17)
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- [OpenJDK 17](https://jdk.java.net/17/)
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- Locally running redis container - a redis container named `dapr_redis` is automatically created when you run `dapr init`
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## Add configuration items to the config store
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- Open a new terminal and set values for config items `orderId1` and `orderId2` by using the command below
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<!-- STEP
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name: Add configuration items
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expected_stdout_lines:
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- 'OK'
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-->
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```bash
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docker exec dapr_redis redis-cli MSET orderId1 "101" orderId2 "102"
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```
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<!-- END_STEP -->
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## Build the Java file
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<!-- STEP
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name: Build Java file
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-->
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```bash
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cd ./order-processor
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mvn clean install
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```
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<!-- END_STEP -->
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## Run order-processor
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1. Navigate to `order-processor` directory.
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2. Run the service app with Dapr.
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<!-- STEP
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name: Run order-processor service
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expected_stdout_lines:
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- '== APP == Configuration for orderId2:{"orderId2":{"value":"102"}}'
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- '== APP == App subscribed to config changes with subscription id:'
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- '= APP == App unsubscribed from config changes'
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- '== APP == Shutting down spring app'
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- "Exited App successfully"
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expected_stderr_lines:
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output_match_mode: substring
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match_order: none
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sleep: 120
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-->
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```bash
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cd ./order-processor
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dapr run --app-id order-processor --app-port 6001 --resources-path ../../../components -- java -jar target/OrderProcessingService-0.0.1-SNAPSHOT.jar
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```
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<!-- END_STEP -->
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## (Optional) Update value of config items
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1. Keep the `order-processor` app running and open a separate terminal
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2. Change the values of `orderId1` and `orderId2` using the command below
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3. `order-processor` app gets the updated values of config items
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<!-- STEP
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name: Update config items
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-->
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```bash
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docker exec dapr_redis redis-cli MSET orderId1 "103" orderId2 "104"
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```
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<!--END_STEP --> |