Fix: How to get pending ActiveMQ messages?

 To retrieve pending messages from an ActiveMQ broker in Node.js, you can use the `stompit` library, which provides a STOMP (Simple Text Oriented Messaging Protocol) client for Node.js. STOMP is a common protocol for interacting with message brokers like ActiveMQ. Here's a basic example of how to connect to ActiveMQ and consume pending messages in Node.js:


1. Install the `stompit` library:


```bash

npm install stompit

```


2. Create a Node.js script to connect to ActiveMQ and consume pending messages:


```javascript

const stompit = require('stompit');


const serverConfig = {

  host: 'localhost', // ActiveMQ server host

  port: 61613, // ActiveMQ STOMP port (usually 61613)

  connectHeaders: {

    host: 'my-broker',

    login: 'your-username', // Replace with your ActiveMQ username

    passcode: 'your-password', // Replace with your ActiveMQ password

    'heart-beat': '5000,5000'

  },

};


// Connect to the ActiveMQ broker

stompit.connect(serverConfig, (error, client) => {

  if (error) {

    console.error('Error connecting to ActiveMQ:', error.message);

    return;

  }


  console.log('Connected to ActiveMQ');


  // Subscribe to the queue

  const subscribeHeaders = {

    destination: '/queue/your-queue-name', // Replace with your queue name

    ack: 'auto',

  };


  client.subscribe(subscribeHeaders, (error, message) => {

    if (error) {

      console.error('Error subscribing to the queue:', error.message);

      return;

    }


    message.readString('utf-8', (error, body) => {

      if (error) {

        console.error('Error reading message:', error.message);

      } else {

        console.log('Received message:', body);

      }

      client.disconnect();

    });

  });

});

```


In this script:


- Replace `'localhost'` with the hostname or IP address of your ActiveMQ server.

- Adjust the `port`, `login`, `passcode`, `destination` (queue name), and other parameters to match your ActiveMQ configuration.

- The script connects to ActiveMQ, subscribes to the specified queue, and processes the pending messages as they arrive.


Make sure to secure your credentials and adjust the error handling and processing logic as needed for your specific use case.

Comments

Post a Comment

Popular posts from this blog

bad character U+002D '-' in my helm template

 In Helm templates, the hyphen character (`-`) can sometimes be treated as a reserved character, particularly when defining values or labels. To include a hyphen character in a Helm template without issues, you can use one of the following approaches: 1. **Quoting the Hyphen:**    You can enclose the hyphen in double quotes, like this:    ```yaml    key: "-"    ```    This way, Helm will interpret the hyphen as a string rather than an operator. 2. **Using Backticks:**    If you need to use the hyphen within a Go template function or inside backticks, you can escape it with a backslash (`\`), like this:    ```yaml    value: `{{ .Values.someField | printf "%s \\-" }}`    ```    The backslash prevents Helm from interpreting the hyphen as a special character. 3. **Variable Assignment:**    Assign the value to a variable and use it. For example:    ```yaml    {{- $hyphen := "-" }}    key: {{ $hyphen }}    ```    This way, you can use the variable `$hyphen` wher
Read more

GitLab pipeline stopped working with invalid yaml error

 When your GitLab pipeline has stopped working with an "invalid YAML" error, it means there's a problem with your `.gitlab-ci.yml` file. This could be due to syntax errors, incorrect indentation, or other issues in your pipeline configuration. Here's how to troubleshoot and resolve this issue: 1. **Check for Syntax Errors**:    Carefully review your `.gitlab-ci.yml` file for any syntax errors. Common issues include missing colons, indentation problems, or mismatched quotation marks. Use a YAML linter or an online YAML validator to identify and correct syntax errors. 2. **Indentation**:    YAML relies heavily on proper indentation. Make sure that all lines within the same block have consistent indentation (typically using spaces, not tabs). Incorrect indentation can cause YAML parsing errors. 3. **Dashes and Lists**:    Ensure that you use the correct syntax for lists (arrays) in YAML by starting each item with a dash (`-`). Be consistent with your use of dashes throug
Read more

How do I add a printer in OpenSUSE which is being shared by a CUPS print server?

 To add a printer in openSUSE that is being shared by a CUPS print server, you can use the following steps: 1. **Ensure CUPS Client is Installed:**    Make sure your openSUSE system has the CUPS client tools installed. You can install them using the following command:    ```bash    sudo zypper install cups-client    ``` 2. **Discover Available Printers:**    Use the `lpinfo` command to discover available printers on your CUPS print server. Replace `cups-server-hostname` with the hostname or IP address of your CUPS server:    ```bash    lpinfo -v -h cups-server-hostname:631    ```    This command should list the printers shared by the CUPS server. 3. **Add a Printer:**    Use the `lpadmin` command to add a printer. Replace `printer-name` with the name of the printer you want to add and `printer-uri` with the URI obtained from the `lpinfo` command:    ```bash    sudo lpadmin -p printer-name -E -v printer-uri    ```    For example:    ```bash    sudo lpadmin -p MyPrinter -E -v socket://cu
Read more