"runtime"
	"sync"
	"sync/atomic"

	"github.com/minio/minio/internal/logger"
	"github.com/minio/minio/internal/store"
	"github.com/minio/pkg/v3/workers"
)

const (
	logSubsys = "notify"

	// The maximum allowed number of concurrent Send() calls to all configured notifications targets
	maxConcurrentAsyncSend = 50000
)

// Target - event target interface
type Target interface {
	ID() TargetID
	IsActive() (bool, error)

	maxOpen           int                    // <= 0 means unlimited
	maxLifetime       time.Duration          // maximum amount of time a connection may be reused
	maxIdleTime       time.Duration          // maximum amount of time a connection may be idle before being closed
	cleanerCh         chan struct{}
	waitCount         int64 // Total number of connections waited for.

      int expectedSize) {
    return new CompactHashSet<>(expectedSize);
  }

  /**
   * Maximum allowed false positive probability of detecting a hash flooding attack given random
   * input.
   */
  @VisibleForTesting(
      )
  static final double HASH_FLOODING_FPP = 0.001;

  /**
   * Maximum allowed length of a hash table bucket before falling back to a j.u.LinkedHashSet based

   */

  // Constants

  /**
   * The maximum capacity, used if a higher value is implicitly specified by either of the
   * constructors with arguments. MUST be a power of two {@code <= 1<<30} to ensure that entries are
   * indexable using ints.
   */
  static final int MAXIMUM_CAPACITY = 1 << 30;

  /** The maximum number of segments to allow; used to bound constructor arguments. */

plugin once it lands on a node. This data is returned by the driver after a successful allocation and is opaque to Kubernetes. Driver documentation may explain to users how to interpret this data if needed.\n\nSetting this field is optional. It has a maximum size of 32 entries. If null (or empty), it is assumed this allocation will be processed by a single kubelet plugin with no ResourceHandle data attached. The name of the kubelet plugin invoked will match the DriverName set in the ResourceClaimStatus...

		Description:    "Your proposed upload exceeds the maximum allowed object size.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrExcessData: {
		Code:           "ExcessData",
		Description:    "More data provided than indicated content length",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrPolicyTooLarge: {
		Code:           "PolicyTooLarge",
		Description:    "Policy exceeds the maximum allowed document size.",

	maxMatchLength  = 258     // The largest match length
	baseMatchOffset = 1       // The smallest match offset
	maxMatchOffset  = 1 << 15 // The largest match offset

	// The maximum number of tokens we put into a single flate block, just to
	// stop things from getting too large.
	maxFlateBlockTokens = 1 << 14
	maxStoreBlockSize   = 65535
	hashBits            = 17 // After 17 performance degrades

	"github.com/minio/minio-go/v7/pkg/credentials"
	xioutil "github.com/minio/minio/internal/ioutil"
	"github.com/minio/pkg/v3/mimedb"
	"github.com/pkg/sftp"
	"golang.org/x/crypto/ssh"
)

// Maximum write offset for incoming SFTP blocks.
// Set to 100MiB to prevent hostile DOS attacks.
const ftpMaxWriteOffset = 100 << 20

type sftpDriver struct {
	permissions *ssh.Permissions
	endpoint    string
}

//
// Because slices aren't comparable and we want to leverage maps for deduplication,
// we have to choose a fixed constant upper bound on the amount of frames we want
// to support. In practice this is fine because there's a maximum depth to these
// stacks anyway.
const pprofMaxStack = 128

// stackMap is a map of trace.Stack to some value V.
type stackMap struct {
	// stacks contains the full list of stacks in the set, however

	db, err := sql.Open("mysql", args.DSN)
	if err != nil {
		target.loggerOnce(context.Background(), err, target.ID().String())
		return err
	}
	target.db = db

	if args.MaxOpenConnections > 0 {
		// Set the maximum connections limit
		target.db.SetMaxOpenConns(args.MaxOpenConnections)
	}

	err = target.db.Ping()
	if err != nil {
		if !(xnet.IsConnRefusedErr(err) || xnet.IsConnResetErr(err)) {