Package org.redisson.api

Interface RSetCache<V>

Type Parameters:

V - value

All Superinterfaces:

Collection<V>, Iterable<V>, RCollectionAsync<V>, RDestroyable, RExpirable, RExpirableAsync, RObject, RObjectAsync, RSet<V>, RSetAsync<V>, RSetCacheAsync<V>, RSortable<Set<V>>, RSortableAsync<Set<V>>, Set<V>

All Known Implementing Classes:

RedissonSetCache, RedissonTransactionalSetCache

public interface RSetCache<V>
extends RSet<V>, RExpirable, RSetCacheAsync<V>, RDestroyable

Set-based cache with ability to set TTL for each object.

Current Redis implementation doesn't have set entry eviction functionality. Thus values are checked for TTL expiration during any value read operation. If entry expired then it doesn't returns and clean task runs asynchronous. Clean task deletes removes 100 expired entries at once. In addition there is EvictionScheduler. This scheduler deletes expired entries in time interval between 5 seconds to 2 hours.

If eviction is not required then it's better to use RSet.

Author:

Nikita Koksharov

Method Summary

Modifier and Type	Method	Description
boolean	add(V value, long ttl, TimeUnit unit)	Stores value with specified time to live.
int	size()	Returns the number of elements in cache.
boolean	tryAdd(long ttl, TimeUnit unit, V... values)	Tries to add elements only if none of them in set.

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface org.redisson.api.RCollectionAsync

addAllAsync, addAsync, containsAllAsync, containsAsync, removeAllAsync, removeAsync, retainAllAsync

Methods inherited from interface org.redisson.api.RDestroyable

destroy

Methods inherited from interface org.redisson.api.RExpirable

clearExpire, expire, expire, expire, expireAt, expireAt, expireIfGreater, expireIfGreater, expireIfLess, expireIfLess, expireIfNotSet, expireIfNotSet, expireIfSet, expireIfSet, getExpireTime, remainTimeToLive

Methods inherited from interface org.redisson.api.RExpirableAsync

clearExpireAsync, expireAsync, expireAsync, expireAsync, expireAtAsync, expireAtAsync, expireIfGreaterAsync, expireIfGreaterAsync, expireIfLessAsync, expireIfLessAsync, expireIfNotSetAsync, expireIfNotSetAsync, expireIfSetAsync, expireIfSetAsync, getExpireTimeAsync, remainTimeToLiveAsync

Methods inherited from interface org.redisson.api.RObject

addListener, copy, delete, dump, getCodec, getIdleTime, getName, isExists, migrate, move, removeListener, rename, renamenx, restore, restore, restoreAndReplace, restoreAndReplace, sizeInMemory, touch, unlink

Methods inherited from interface org.redisson.api.RObjectAsync

addListenerAsync, copyAsync, deleteAsync, dumpAsync, getIdleTimeAsync, isExistsAsync, migrateAsync, moveAsync, removeListenerAsync, renameAsync, renamenxAsync, restoreAndReplaceAsync, restoreAndReplaceAsync, restoreAsync, restoreAsync, sizeInMemoryAsync, touchAsync, unlinkAsync

Methods inherited from interface org.redisson.api.RSet

addAllCounted, containsEach, countIntersection, countIntersection, diff, distributedIterator, distributedIterator, distributedIterator, getCountDownLatch, getFairLock, getLock, getPermitExpirableSemaphore, getReadWriteLock, getSemaphore, intersection, iterator, iterator, iterator, mapReduce, move, random, random, readAll, readDiff, readIntersection, readUnion, removeAllCounted, removeRandom, removeRandom, stream, stream, stream, tryAdd, union

Methods inherited from interface org.redisson.api.RSetAsync

addAllCountedAsync, containsEachAsync, countIntersectionAsync, countIntersectionAsync, diffAsync, intersectionAsync, moveAsync, randomAsync, randomAsync, readAllAsync, readDiffAsync, readIntersectionAsync, readUnionAsync, removeAllCountedAsync, removeRandomAsync, removeRandomAsync, tryAddAsync, unionAsync

Methods inherited from interface org.redisson.api.RSetCacheAsync

addAsync, sizeAsync, tryAddAsync

Methods inherited from interface org.redisson.api.RSortable

readSort, readSort, readSort, readSort, readSort, readSort, readSortAlpha, readSortAlpha, readSortAlpha, readSortAlpha, readSortAlpha, readSortAlpha, sortTo, sortTo, sortTo, sortTo, sortTo, sortTo

Methods inherited from interface org.redisson.api.RSortableAsync

readSortAlphaAsync, readSortAlphaAsync, readSortAlphaAsync, readSortAlphaAsync, readSortAlphaAsync, readSortAlphaAsync, readSortAsync, readSortAsync, readSortAsync, readSortAsync, readSortAsync, readSortAsync, sortToAsync, sortToAsync, sortToAsync, sortToAsync, sortToAsync, sortToAsync

Methods inherited from interface java.util.Set

add, addAll, clear, contains, containsAll, equals, hashCode, isEmpty, iterator, remove, removeAll, retainAll, spliterator, toArray, toArray

Method Details

add

boolean add(V value,
 long ttl,
 TimeUnit unit)

Stores value with specified time to live. Value expires after specified time to live.

Parameters:

value - to add

ttl - - time to live for key\value entry. If 0 then stores infinitely.

unit - - time unit

Returns:

true if value has been added. false if value already been in collection.

size

int size()

Returns the number of elements in cache. This number can reflects expired elements too due to non realtime cleanup process.

Specified by:

size in interface Collection<V>

Specified by:

size in interface Set<V>

Returns:

size of set

tryAdd

boolean tryAdd(long ttl,
 TimeUnit unit,
 V... values)

Tries to add elements only if none of them in set.

Parameters:

values - - values to add

ttl - - time to live for value. If 0 then stores infinitely.

unit - - time unit

Returns:

true if elements successfully added, otherwise false.