Class Cache<E>

java.lang.Object

io.netty.resolver.dns.Cache<E>

Type Parameters:

E -

abstract class Cache<E>
extends Object

Abstract cache that automatically removes entries for a hostname once the TTL for an entry is reached.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private final class	Cache.Entries

Field Summary

Fields

Modifier and Type	Field	Description
private static final ScheduledFuture<?>	CANCELLED
private static final AtomicReferenceFieldUpdater<Cache.Entries, ScheduledFuture>	FUTURE_UPDATER
(package private) static final int	MAX_SUPPORTED_TTL_SECS
private final ConcurrentMap<String, Cache<E>.Entries>	resolveCache

Constructor Summary

Constructors

Constructor	Description
Cache()

Method Summary

Modifier and Type	Method	Description
(package private) final void	cache(String hostname, E value, int ttl, EventLoop loop)	Cache a value for the given hostname that will automatically expire once the TTL is reached.
(package private) final void	clear()	Remove everything from the cache.
(package private) final boolean	clear(String hostname)	Clear all entries (if anything exists) for the given hostname and return true if anything was removed.
protected abstract boolean	equals(E entry, E otherEntry)	Returns true if both entries are equal.
(package private) final List<? extends E>	get(String hostname)	Returns all caches entries for the given hostname.
protected abstract boolean	shouldReplaceAll(E entry)	Returns true if this entry should replace all other entries that are already cached for the hostname.
(package private) final int	size()	Return the number of hostnames for which we have cached something.
protected void	sortEntries(String hostname, List<E> entries)	Sort the List for a hostname before caching these.

Methods inherited from class Object

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

Field Details

FUTURE_UPDATER

private static final AtomicReferenceFieldUpdater<Cache.Entries, ScheduledFuture> FUTURE_UPDATER

CANCELLED

private static final ScheduledFuture<?> CANCELLED

MAX_SUPPORTED_TTL_SECS

static final int MAX_SUPPORTED_TTL_SECS

resolveCache

private final ConcurrentMap<String, Cache<E>.Entries> resolveCache

Constructor Details

Cache

Cache()

Method Details

clear

final void clear()

Remove everything from the cache.

clear

final boolean clear(String hostname)

Clear all entries (if anything exists) for the given hostname and return true if anything was removed.

get

final List<? extends E> get(String hostname)

Returns all caches entries for the given hostname.

cache

final void cache(String hostname,
 E value,
 int ttl,
 EventLoop loop)

Cache a value for the given hostname that will automatically expire once the TTL is reached.

size

final int size()

Return the number of hostnames for which we have cached something.

shouldReplaceAll

protected abstract boolean shouldReplaceAll(E entry)

Returns true if this entry should replace all other entries that are already cached for the hostname.

sortEntries

protected void sortEntries(String hostname,
 List<E> entries)

Sort the List for a hostname before caching these.

equals

protected abstract boolean equals(E entry,
 E otherEntry)

Returns true if both entries are equal.