Certainly, here's a high-level example of how you might set up communication between an Angular client and a Camunda 8 instance using the Zeebe Java client for workflow orchestration. Please note that this is a simplified example, and you would need to adapt it to your specific use case and environment.
1. **Java Backend (Zeebe Client):**
Assuming you have a Java backend that serves as an intermediary between your Angular frontend and Camunda/Zeebe, you can use the Zeebe Java client to interact with Zeebe. Here's a basic example of how you might set up a simple process instance:
```java
import io.zeebe.client.ZeebeClient;
public class ZeebeService {
public void startWorkflowInstance() {
final ZeebeClient client = ZeebeClient.newClientBuilder()
.brokerContactPoint("localhost:26500") // Replace with your Zeebe broker address
.build();
client.newCreateInstanceCommand()
.bpmnProcessId("process-id") // Replace with your BPMN process ID
.send().join();
client.close();
}
}
```
2. **Angular Frontend:**
For the Angular frontend, you might use Angular's HTTP client to communicate with your Java backend. Here's a simple example of an Angular service that triggers the workflow:
```typescript
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
@Injectable({
providedIn: 'root'
})
export class WorkflowService {
private backendUrl = 'http://localhost:8080'; // Replace with your backend URL
constructor(private http: HttpClient) { }
startWorkflow() {
return this.http.post(`${this.backendUrl}/start-workflow`, {});
}
}
```
3. **Java Backend (REST Endpoint):**
In your Java backend, create a REST endpoint to trigger the workflow using the Zeebe client. You might be using a framework like Spring Boot for this:
```java
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class WorkflowController {
private final ZeebeService zeebeService;
public WorkflowController(ZeebeService zeebeService) {
this.zeebeService = zeebeService;
}
@PostMapping("/start-workflow")
public void startWorkflow() {
zeebeService.startWorkflowInstance();
}
}
```
Sure, here's an example of how you might use the Zeebe Java client to interact with the Camunda Cloud (formerly known as Zeebe) REST connector in Camunda Cloud:
```java
import io.camunda.zeebe.client.ZeebeClient;
import io.camunda.zeebe.client.api.worker.JobWorker;
import io.camunda.zeebe.client.api.response.ActivatedJob;
public class ZeebeRestConnectorExample {
public static void main(String[] args) {
// Set up Zeebe client
ZeebeClient zeebeClient = ZeebeClient.newClientBuilder()
.brokerContactPoint("your-broker-address:26500") // Replace with your broker address
.build();
// Create a job worker
JobWorker jobWorker = zeebeClient.newWorker()
.jobType("rest-connector") // Replace with your job type
.handler((client, job) -> {
// Perform your REST API call here
// You can access job variables using job.getVariables()
// Example: Print the variables
System.out.println("Job Variables: " + job.getVariables());
// Complete the job
client.newCompleteCommand(job.getKey())
.send()
.join();
})
.open();
// Close the worker and the client when done
Runtime.getRuntime().addShutdownHook(new Thread(zeebeClient::close));
}
}
```
Make sure to replace `"your-broker-address:26500"` with the actual address of your Zeebe broker and `"rest-connector"` with your specific job type for the REST connector.
This example demonstrates how to create a Zeebe client, set up a job worker, and handle jobs by performing a REST API call. Remember to handle any exceptions and add appropriate error handling according to your use case.
Please remember that this is a simplified example meant to illustrate the concept. In a real-world scenario, you'd need error handling, security measures, and a more structured approach. Also, adapt the example to your specific Camunda and Zeebe configurations.
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