public long getLastActivityTime() {
            return lastActivityTime;
        }

        public double getSuccessRate() {
            long total = successCount.get() + failureCount.get();
            return total > 0 ? (double) successCount.get() / total : 1.0;
        }
    }

    /**
     * Pool health metrics for monitoring
     */
    public static class PoolHealthMetrics {

import jcifs.internal.util.SMBUtil;

/**
 * Represents the SMB_INFO_ALLOCATION information level used in SMB transaction requests.
 * This structure provides allocation information for a file system including total units,
 * free units, sectors per allocation unit, and bytes per sector.
 */
public class SmbInfoAllocation implements AllocInfo {

    /**
     * Default constructor for SMB allocation information.
     */

## An app with callbacks { #an-app-with-callbacks }

Let's see all this with an example.

Imagine you develop an app that allows creating invoices.

These invoices will have an `id`, `title` (optional), `customer`, and `total`.

The user of your API (an external developer) will create an invoice in your API with a POST request.

Then your API will (let's imagine):

* Send the invoice to some customer of the external developer.

## Um aplicativo com callbacks

Vamos ver tudo isso com um exemplo.

Imagine que você tem um aplicativo que permite criar faturas.

Essas faturas terão um `id`, `title` (opcional), `customer` e `total`.

O usuário da sua API (um desenvolvedor externo) criará uma fatura em sua API com uma solicitação POST.

Então sua API irá (vamos imaginar):

* Enviar uma solicitação de pagamento para o desenvolvedor externo.

...
11:55:40 I/XmlResultReporter: XML test result file generated at /Users/myusername/workspace/okhttp/android-test/build/outputs/androidTest-results/connected/TEST-pixel3a-Q(AVD) - 10-android-test-.xml. Total tests 13, passed 11, assumption_failure 1, ignored 1,
...
BUILD SUCCESSFUL in 1m 30s
63 actionable tasks: 61 executed, 2 up-to-date

```

	DB.Create(&users)

	rows, err := DB.Select("name, count(*) as total").Table("users").Group("name").Having("name IN ?", []string{users[0].Name, users[1].Name}).Rows()
	if err != nil {
		t.Fatalf("got error %v", err)
	}

	defer rows.Close()
	for rows.Next() {
		var name string
		var total int64
		rows.Scan(&name, &total)

		if name == users[0].Name && total != 3 {

    
    public double getCacheHitRatio() {
        long hits = cacheHits.get();
        long misses = cacheMisses.get();
        long total = hits + misses;
        
        if (total == 0) return 0.0;
        return (double) hits / total;
    }
    
    public void recordCacheHit() { cacheHits.incrementAndGet(); }
    public void recordCacheMiss() { cacheMisses.incrementAndGet(); }

        operationErrors.incrementAndGet();
    }
    
    public double getErrorRate() {
        long total = rdmaReads.get() + rdmaWrites.get() + rdmaSends.get() + rdmaReceives.get();
        if (total == 0) return 0.0;
        return (double) operationErrors.get() / total;
    }
    
    // Getters for all statistics...
}
```

## 9. Error Handling and Fallback

// disk usage per path.
// The above means that any added/deleted fields are incompatible.
//
// The above means that any added/deleted fields are incompatible.
//
//msgp:tuple DiskInfo
type DiskInfo struct {
	Total      uint64
	Free       uint64
	Used       uint64
	UsedInodes uint64
	FreeInodes uint64
	Major      uint32
	Minor      uint32
	NRRequests uint64
	FSType     string
	RootDisk   bool
	Healing    bool

		size = diskAssumeUnknownSize
	}

	var available uint64
	var total uint64
	var nDisks int
	for _, disk := range di {
		if disk == nil || disk.Total == 0 {
			// Disk offline, no inodes or something else is wrong.
			continue
		}
		nDisks++
		total += disk.Total
		available += disk.Total - disk.Used
	}

	if nDisks < len(di)/2 || nDisks <= 0 {
		var errs []error