Package io.netty.resolver.dns

Class DnsQueryIdSpace

java.lang.Object

io.netty.resolver.dns.DnsQueryIdSpace

final class DnsQueryIdSpace
extends Object

Special data-structure that will allow to retrieve the next query id to use, while still guarantee some sort of randomness. The query id will be between 0 (inclusive) and 65535 (inclusive) as defined by the RFC.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static final class	DnsQueryIdSpace.DnsQueryIdRange	Provides a query if from a range of possible ids.

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	BUCKET_DROP_THRESHOLD
private static final int	BUCKET_SIZE
private static final int	BUCKETS
private final DnsQueryIdSpace.DnsQueryIdRange[]	idBuckets
private static final int	MAX_ID

Constructor Summary

Constructors

Constructor	Description
DnsQueryIdSpace()

Method Summary

Modifier and Type	Method	Description
(package private) int	maxUsableIds()	Return the maximum number of ids that are supported.
private static DnsQueryIdSpace.DnsQueryIdRange	newBucket(int idBucketsIdx)
(package private) int	nextId()	Returns the next ID to use for a query or -1 if there is none left to use.
(package private) void	pushId(int id)	Push back the id, so it can be used again for the next query.
(package private) int	usableIds()	Return how much more usable ids are left.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

MAX_ID

private static final int MAX_ID

See Also:

• Constant Field Values

BUCKETS

private static final int BUCKETS

See Also:

• Constant Field Values

BUCKET_SIZE

private static final int BUCKET_SIZE

See Also:

• Constant Field Values

BUCKET_DROP_THRESHOLD

private static final int BUCKET_DROP_THRESHOLD

See Also:

• Constant Field Values

idBuckets

private final DnsQueryIdSpace.DnsQueryIdRange[] idBuckets

Constructor Details

DnsQueryIdSpace

DnsQueryIdSpace()

Method Details

newBucket

private static DnsQueryIdSpace.DnsQueryIdRange newBucket(int idBucketsIdx)

nextId

int nextId()

Returns the next ID to use for a query or -1 if there is none left to use.

Returns:

next id to use.

pushId

void pushId(int id)

Push back the id, so it can be used again for the next query.

Parameters:

id - the id.

usableIds

int usableIds()

Return how much more usable ids are left.

Returns:

the number of ids that are left for usage.

maxUsableIds

int maxUsableIds()

Return the maximum number of ids that are supported.

Returns:

the maximum number of ids.