How do I watch resources and handle events?

Go, watch resources, handle events, Golang events, resource monitoring, event handling, Go example

Learn how to watch resources and handle events in Go. This guide provides an example of resource monitoring and event handling using Golang.


        package main

        import (
            "fmt"
            "time"
        )

        // Resource represents the entity to be monitored
        type Resource struct {
            ID    string
            Value int
        }

        // Watcher watches for changes in resources
        type Watcher struct {
            resources map[string]*Resource
            onChange  func(resource *Resource)
        }

        // NewWatcher creates a new watcher
        func NewWatcher(onChange func(resource *Resource)) *Watcher {
            return &Watcher{
                resources: make(map[string]*Resource),
                onChange:  onChange,
            }
        }

        // UpdateResource updates the resource and triggers the event
        func (w *Watcher) UpdateResource(resource *Resource) {
            w.resources[resource.ID] = resource
            w.onChange(resource)
        }

        func main() {
            watcher := NewWatcher(func(resource *Resource) {
                fmt.Printf("Resource updated: ID=%s, Value=%d\n", resource.ID, resource.Value)
            })

            go func() {
                for {
                    time.Sleep(2 * time.Second)
                    watcher.UpdateResource(&Resource{ID: "1", Value: newValue()})
                }
            }()

            select {} // Keep the main routine alive
        }

        func newValue() int {
            return int(time.Now().UnixNano() % 100) // Mock value generation
        }

How do I watch resources and handle events?

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How do I watch resources and handle events?

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