org.redisson

Class RedissonBlockingDeque<V>

java.lang.Object

org.redisson.RedissonObject

org.redisson.RedissonList<V>

org.redisson.RedissonQueue<V>

org.redisson.RedissonDeque<V>

org.redisson.RedissonBlockingDeque<V>

All Implemented Interfaces:

Iterable<V>, Collection<V>, BlockingDeque<V>, BlockingQueue<V>, Deque<V>, List<V>, Queue<V>, RandomAccess, RBlockingDeque<V>, RBlockingDequeAsync<V>, RBlockingQueue<V>, RBlockingQueueAsync<V>, RCollectionAsync<V>, RDeque<V>, RDequeAsync<V>, RExpirable, RExpirableAsync, RList<V>, RListAsync<V>, RObject, RObjectAsync, RQueue<V>, RQueueAsync<V>, RSortable<List<V>>, RSortableAsync<List<V>>

public class RedissonBlockingDeque<V>
extends RedissonDeque<V>
implements RBlockingDeque<V>

Distributed and concurrent implementation of BlockingDeque.

Queue size limited by Redis server memory amount. This is why remainingCapacity() always returns Integer.MAX_VALUE

Author:

Nikita Koksharov

Field Summary

Fields inherited from class org.redisson.RedissonList

EVAL_BOOLEAN_ARGS2

Fields inherited from class org.redisson.RedissonObject

codec, commandExecutor

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	RedissonBlockingDeque(Codec codec, CommandAsyncExecutor commandExecutor, String name, RedissonClient redisson)
protected	RedissonBlockingDeque(CommandAsyncExecutor commandExecutor, String name, RedissonClient redisson)

Method Summary

Modifier and Type	Method and Description
boolean	clearExpire() Clear an expire timeout or expire date for object.
RFuture<Boolean>	clearExpireAsync() Clear an expire timeout or expire date for object in async mode.
int	drainTo(Collection<? super V> c)
int	drainTo(Collection<? super V> c, int maxElements)
RFuture<Integer>	drainToAsync(Collection<? super V> c) Removes all available elements from this queue and adds them to the given collection in async mode.
RFuture<Integer>	drainToAsync(Collection<? super V> c, int maxElements) Removes at most the given number of available elements from this queue and adds them to the given collection in async mode.
boolean	expire(long timeToLive, TimeUnit timeUnit) Set a timeout for object.
RFuture<Boolean>	expireAsync(long timeToLive, TimeUnit timeUnit) Set a timeout for object in async mode.
boolean	expireAt(Date timestamp) Set an expire date for object.
boolean	expireAt(long timestamp) Set an expire date for object.
RFuture<Boolean>	expireAtAsync(Date timestamp) Set an expire date for object in async mode.
RFuture<Boolean>	expireAtAsync(long timestamp) Set an expire date for object in async mode.
boolean	offer(V e, long timeout, TimeUnit unit)
boolean	offerFirst(V e, long timeout, TimeUnit unit)
boolean	offerLast(V e, long timeout, TimeUnit unit)
V	poll(long timeout, TimeUnit unit)
RFuture<V>	pollAsync(long timeout, TimeUnit unit) Retrieves and removes the head of this queue in async mode, waiting up to the specified wait time if necessary for an element to become available.
V	pollFirst(long timeout, TimeUnit unit)
RFuture<V>	pollFirstAsync(long timeout, TimeUnit unit)
V	pollFirstFromAny(long timeout, TimeUnit unit, String... queueNames) Retrieves and removes first available head element of any queue, waiting up to the specified wait time if necessary for an element to become available in any of defined queues including queue own.
RFuture<V>	pollFirstFromAnyAsync(long timeout, TimeUnit unit, String... queueNames) Retrieves and removes first available head element of any queue in async mode, waiting up to the specified wait time if necessary for an element to become available in any of defined queues including queue own.
V	pollFromAny(long timeout, TimeUnit unit, String... queueNames) Retrieves and removes first available head element of any queue, waiting up to the specified wait time if necessary for an element to become available in any of defined queues including queue own.
RFuture<V>	pollFromAnyAsync(long timeout, TimeUnit unit, String... queueNames) Retrieves and removes first available head element of any queue in async mode, waiting up to the specified wait time if necessary for an element to become available in any of defined queues including queue own.
V	pollLast(long timeout, TimeUnit unit)
V	pollLastAndOfferFirstTo(String queueName, long timeout, TimeUnit unit)
RFuture<V>	pollLastAndOfferFirstToAsync(String queueName, long timeout, TimeUnit unit)
RFuture<V>	pollLastAsync(long timeout, TimeUnit unit)
V	pollLastFromAny(long timeout, TimeUnit unit, String... queueNames) Retrieves and removes first available tail element of any queue, waiting up to the specified wait time if necessary for an element to become available in any of defined queues including queue own.
RFuture<V>	pollLastFromAnyAsync(long timeout, TimeUnit unit, String... queueNames) Retrieves and removes first available tail element of any queue in async mode, waiting up to the specified wait time if necessary for an element to become available in any of defined queues including queue own.
void	put(V e)
RFuture<Void>	putAsync(V e) Inserts the specified element into this queue in async mode, waiting if necessary for space to become available.
void	putFirst(V e)
RFuture<Void>	putFirstAsync(V e)
void	putLast(V e)
RFuture<Void>	putLastAsync(V e)
int	remainingCapacity()
long	remainTimeToLive() Remaining time to live of Redisson object that has a timeout
RFuture<Long>	remainTimeToLiveAsync() Get remaining time to live of object in seconds.
V	take()
RFuture<V>	takeAsync() Retrieves and removes the head of this queue in async mode, waiting if necessary until an element becomes available.
V	takeFirst()
RFuture<V>	takeFirstAsync()
V	takeLast()
V	takeLastAndOfferFirstTo(String queueName)
RFuture<V>	takeLastAndOfferFirstToAsync(String queueName)
RFuture<V>	takeLastAsync()

Methods inherited from class org.redisson.RedissonDeque

addFirst, addFirstAsync, addLast, addLastAsync, descendingIterator, getLast, getLastAsync, offerFirst, offerFirstAsync, offerLast, offerLastAsync, peekFirst, peekFirstAsync, peekLast, peekLastAsync, pollFirst, pollFirstAsync, pollLast, pollLastAsync, pop, popAsync, push, pushAsync, removeFirstAsync, removeFirstOccurrence, removeFirstOccurrenceAsync, removeLast, removeLastAsync, removeLastOccurrence, removeLastOccurrenceAsync

Methods inherited from class org.redisson.RedissonQueue

element, getFirst, offer, offerAsync, peek, peekAsync, poll, pollAsync, pollLastAndOfferFirstTo, pollLastAndOfferFirstToAsync, remove, removeFirst, toSeconds

Methods inherited from class org.redisson.RedissonList

add, add, addAfter, addAfterAsync, addAll, addAll, addAllAsync, addAllAsync, addAsync, addAsync, addBefore, addBeforeAsync, clear, contains, containsAll, containsAllAsync, containsAsync, equals, fastRemove, fastRemoveAsync, fastSet, fastSetAsync, get, get, getAsync, getAsync, hashCode, indexOf, indexOfAsync, indexOfAsync, isEmpty, iterator, lastIndexOf, lastIndexOfAsync, lastIndexOfAsync, listIterator, listIterator, mapReduce, readAll, readAllAsync, readSort, readSort, readSort, readSort, readSort, readSort, readSortAsync, readSortAsync, readSortAsync, readSortAsync, readSortAsync, readSortAsync, remove, remove, remove, remove, removeAll, removeAllAsync, removeAsync, removeAsync, removeAsync, retainAll, retainAllAsync, set, setAsync, size, sizeAsync, sortTo, sortTo, sortTo, sortTo, sortTo, sortTo, sortToAsync, sortToAsync, sortToAsync, sortToAsync, sortToAsync, sortToAsync, subList, toArray, toArray, toString, trim, trimAsync

Methods inherited from class org.redisson.RedissonObject

await, delete, deleteAsync, encode, encodeMapKey, encodeMapValue, get, getCodec, getName, getName, isExists, isExistsAsync, migrate, migrateAsync, move, moveAsync, newPromise, newSucceededFuture, prefixName, rename, renameAsync, renamenx, renamenxAsync, suffixName, touch, touchAsync, unlink, unlinkAsync

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.concurrent.BlockingDeque

add, addFirst, addLast, contains, element, iterator, offer, offerFirst, offerLast, peek, poll, push, remove, remove, removeFirstOccurrence, removeLastOccurrence, size

Methods inherited from interface java.util.Deque

descendingIterator, getFirst, getLast, peekFirst, peekLast, pollFirst, pollLast, pop, removeFirst, removeLast

Methods inherited from interface org.redisson.api.RQueue

pollLastAndOfferFirstTo, readAll

Methods inherited from interface java.util.Collection

addAll, clear, containsAll, equals, hashCode, isEmpty, parallelStream, removeAll, removeIf, retainAll, spliterator, stream, toArray, toArray

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface org.redisson.api.RExpirable

clearExpire, expire, expireAt, expireAt, remainTimeToLive

Methods inherited from interface org.redisson.api.RObject

delete, getCodec, getName, isExists, migrate, move, rename, renamenx, touch, unlink

Methods inherited from interface org.redisson.api.RDequeAsync

addFirstAsync, addLastAsync, getLastAsync, offerFirstAsync, offerLastAsync, peekFirstAsync, peekLastAsync, pollFirstAsync, pollLastAsync, popAsync, pushAsync, removeFirstAsync, removeFirstOccurrenceAsync, removeLastAsync, removeLastOccurrenceAsync

Methods inherited from interface org.redisson.api.RQueueAsync

offerAsync, peekAsync, pollAsync, pollLastAndOfferFirstToAsync, readAllAsync

Methods inherited from interface org.redisson.api.RCollectionAsync

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

Methods inherited from interface org.redisson.api.RExpirableAsync

clearExpireAsync, expireAsync, expireAtAsync, expireAtAsync, remainTimeToLiveAsync

Methods inherited from interface org.redisson.api.RObjectAsync

deleteAsync, isExistsAsync, migrateAsync, moveAsync, renameAsync, renamenxAsync, touchAsync, unlinkAsync

Methods inherited from interface java.util.List

replaceAll, sort, spliterator

Constructor Detail

RedissonBlockingDeque

protected RedissonBlockingDeque(CommandAsyncExecutor commandExecutor,
                                String name,
                                RedissonClient redisson)

RedissonBlockingDeque

protected RedissonBlockingDeque(Codec codec,
                                CommandAsyncExecutor commandExecutor,
                                String name,
                                RedissonClient redisson)

Method Detail

putAsync

public RFuture<Void> putAsync(V e)

Description copied from interface: RBlockingQueueAsync

Inserts the specified element into this queue in async mode, waiting if necessary for space to become available.

Specified by:

putAsync in interface RBlockingQueueAsync<V>

Parameters:

e - the element to add

Returns:

void

put

public void put(V e)
         throws InterruptedException

Specified by:

put in interface BlockingDeque<V>

Specified by:

put in interface BlockingQueue<V>

Throws:

InterruptedException

offer

public boolean offer(V e,
                     long timeout,
                     TimeUnit unit)
              throws InterruptedException

Specified by:

offer in interface BlockingDeque<V>

Specified by:

offer in interface BlockingQueue<V>

Throws:

InterruptedException

takeAsync

public RFuture<V> takeAsync()

Description copied from interface: RBlockingQueueAsync

Retrieves and removes the head of this queue in async mode, waiting if necessary until an element becomes available.

Specified by:

takeAsync in interface RBlockingQueueAsync<V>

Returns:

the head of this queue

take

public V take()
       throws InterruptedException

Specified by:

take in interface BlockingDeque<V>

Specified by:

take in interface BlockingQueue<V>

Throws:

InterruptedException

pollAsync

public RFuture<V> pollAsync(long timeout,
                            TimeUnit unit)

Description copied from interface: RBlockingQueueAsync

Retrieves and removes the head of this queue in async mode, waiting up to the specified wait time if necessary for an element to become available.

Specified by:

pollAsync in interface RBlockingQueueAsync<V>

Parameters:

timeout - how long to wait before giving up, in units of unit

unit - a TimeUnit determining how to interpret the timeout parameter

Returns:

the head of this queue, or null if the specified waiting time elapses before an element is available

poll

public V poll(long timeout,
              TimeUnit unit)
       throws InterruptedException

Specified by:

poll in interface BlockingDeque<V>

Specified by:

poll in interface BlockingQueue<V>

Throws:

InterruptedException

pollFromAny

public V pollFromAny(long timeout,
                     TimeUnit unit,
                     String... queueNames)
              throws InterruptedException

Description copied from interface: RBlockingQueue

Retrieves and removes first available head element of any queue, waiting up to the specified wait time if necessary for an element to become available in any of defined queues including queue own.

Specified by:

pollFromAny in interface RBlockingQueue<V>

Parameters:

timeout - how long to wait before giving up, in units of unit

unit - a TimeUnit determining how to interpret the timeout parameter

queueNames - - names of queue

Returns:

the head of this queue, or null if the specified waiting time elapses before an element is available

Throws:

InterruptedException - if interrupted while waiting

pollFromAnyAsync

public RFuture<V> pollFromAnyAsync(long timeout,
                                   TimeUnit unit,
                                   String... queueNames)

Description copied from interface: RBlockingQueueAsync

Retrieves and removes first available head element of any queue in async mode, waiting up to the specified wait time if necessary for an element to become available in any of defined queues including queue own.

Specified by:

pollFromAnyAsync in interface RBlockingQueueAsync<V>

Parameters:

timeout - how long to wait before giving up, in units of unit

unit - a TimeUnit determining how to interpret the timeout parameter

queueNames - - names of queue

Returns:

Future object with the head of this queue, or null if the specified waiting time elapses before an element is available

pollLastAndOfferFirstToAsync

public RFuture<V> pollLastAndOfferFirstToAsync(String queueName,
                                               long timeout,
                                               TimeUnit unit)

Specified by:

pollLastAndOfferFirstToAsync in interface RBlockingQueueAsync<V>

pollLastAndOfferFirstTo

public V pollLastAndOfferFirstTo(String queueName,
                                 long timeout,
                                 TimeUnit unit)
                          throws InterruptedException

Specified by:

pollLastAndOfferFirstTo in interface RBlockingQueue<V>

Throws:

InterruptedException

takeLastAndOfferFirstTo

public V takeLastAndOfferFirstTo(String queueName)
                          throws InterruptedException

Specified by:

takeLastAndOfferFirstTo in interface RBlockingQueue<V>

Throws:

InterruptedException

takeLastAndOfferFirstToAsync

public RFuture<V> takeLastAndOfferFirstToAsync(String queueName)

Specified by:

takeLastAndOfferFirstToAsync in interface RBlockingQueueAsync<V>

remainingCapacity

public int remainingCapacity()

Specified by:

remainingCapacity in interface BlockingQueue<V>

drainTo

public int drainTo(Collection<? super V> c)

Specified by:

drainTo in interface BlockingQueue<V>

drainToAsync

public RFuture<Integer> drainToAsync(Collection<? super V> c)

Description copied from interface: RBlockingQueueAsync

Removes all available elements from this queue and adds them to the given collection in async mode. This operation may be more efficient than repeatedly polling this queue. A failure encountered while attempting to add elements to collection c may result in elements being in neither, either or both collections when the associated exception is thrown. Attempts to drain a queue to itself result in IllegalArgumentException. Further, the behavior of this operation is undefined if the specified collection is modified while the operation is in progress.

Specified by:

drainToAsync in interface RBlockingQueueAsync<V>

Parameters:

c - the collection to transfer elements into

Returns:

the number of elements transferred

drainTo

public int drainTo(Collection<? super V> c,
                   int maxElements)

Specified by:

drainTo in interface BlockingQueue<V>

drainToAsync

public RFuture<Integer> drainToAsync(Collection<? super V> c,
                                     int maxElements)

Description copied from interface: RBlockingQueueAsync

Removes at most the given number of available elements from this queue and adds them to the given collection in async mode. A failure encountered while attempting to add elements to collection c may result in elements being in neither, either or both collections when the associated exception is thrown. Attempts to drain a queue to itself result in IllegalArgumentException. Further, the behavior of this operation is undefined if the specified collection is modified while the operation is in progress.

Specified by:

drainToAsync in interface RBlockingQueueAsync<V>

Parameters:

c - the collection to transfer elements into

maxElements - the maximum number of elements to transfer

Returns:

the number of elements transferred

putFirstAsync

public RFuture<Void> putFirstAsync(V e)

Specified by:

putFirstAsync in interface RBlockingDequeAsync<V>

putLastAsync

public RFuture<Void> putLastAsync(V e)

Specified by:

putLastAsync in interface RBlockingDequeAsync<V>

putFirst

public void putFirst(V e)
              throws InterruptedException

Specified by:

putFirst in interface BlockingDeque<V>

Throws:

InterruptedException

putLast

public void putLast(V e)
             throws InterruptedException

Specified by:

putLast in interface BlockingDeque<V>

Throws:

InterruptedException

offerFirst

public boolean offerFirst(V e,
                          long timeout,
                          TimeUnit unit)
                   throws InterruptedException

Specified by:

offerFirst in interface BlockingDeque<V>

Throws:

InterruptedException

offerLast

public boolean offerLast(V e,
                         long timeout,
                         TimeUnit unit)
                  throws InterruptedException

Specified by:

offerLast in interface BlockingDeque<V>

Throws:

InterruptedException

takeFirst

public V takeFirst()
            throws InterruptedException

Specified by:

takeFirst in interface BlockingDeque<V>

Throws:

InterruptedException

takeFirstAsync

public RFuture<V> takeFirstAsync()

Specified by:

takeFirstAsync in interface RBlockingDequeAsync<V>

takeLastAsync

public RFuture<V> takeLastAsync()

Specified by:

takeLastAsync in interface RBlockingDequeAsync<V>

takeLast

public V takeLast()
           throws InterruptedException

Specified by:

takeLast in interface BlockingDeque<V>

Throws:

InterruptedException

pollFirstAsync

public RFuture<V> pollFirstAsync(long timeout,
                                 TimeUnit unit)

Specified by:

pollFirstAsync in interface RBlockingDequeAsync<V>

pollFirstFromAny

public V pollFirstFromAny(long timeout,
                          TimeUnit unit,
                          String... queueNames)
                   throws InterruptedException

Description copied from interface: RBlockingDeque

Retrieves and removes first available head element of any queue, waiting up to the specified wait time if necessary for an element to become available in any of defined queues including queue own.

Specified by:

pollFirstFromAny in interface RBlockingDeque<V>

Parameters:

timeout - how long to wait before giving up, in units of unit

unit - a TimeUnit determining how to interpret the timeout parameter

queueNames - - names of queue

Returns:

the head of this queue, or null if the specified waiting time elapses before an element is available

Throws:

InterruptedException - if interrupted while waiting

pollFirstFromAnyAsync

public RFuture<V> pollFirstFromAnyAsync(long timeout,
                                        TimeUnit unit,
                                        String... queueNames)

Description copied from interface: RBlockingDequeAsync

Retrieves and removes first available head element of any queue in async mode, waiting up to the specified wait time if necessary for an element to become available in any of defined queues including queue own.

Specified by:

pollFirstFromAnyAsync in interface RBlockingDequeAsync<V>

Parameters:

timeout - how long to wait before giving up, in units of unit

unit - a TimeUnit determining how to interpret the timeout parameter

queueNames - - names of queue

Returns:

the head of this queue, or null if the specified waiting time elapses before an element is available

pollLastFromAny

public V pollLastFromAny(long timeout,
                         TimeUnit unit,
                         String... queueNames)
                  throws InterruptedException

Description copied from interface: RBlockingDeque

Retrieves and removes first available tail element of any queue, waiting up to the specified wait time if necessary for an element to become available in any of defined queues including queue own.

Specified by:

pollLastFromAny in interface RBlockingDeque<V>

Parameters:

timeout - how long to wait before giving up, in units of unit

unit - a TimeUnit determining how to interpret the timeout parameter

queueNames - - names of queue

Returns:

the head of this queue, or null if the specified waiting time elapses before an element is available

Throws:

InterruptedException - if interrupted while waiting

pollLastFromAnyAsync

public RFuture<V> pollLastFromAnyAsync(long timeout,
                                       TimeUnit unit,
                                       String... queueNames)

Description copied from interface: RBlockingDequeAsync

Retrieves and removes first available tail element of any queue in async mode, waiting up to the specified wait time if necessary for an element to become available in any of defined queues including queue own.

Specified by:

pollLastFromAnyAsync in interface RBlockingDequeAsync<V>

Parameters:

timeout - how long to wait before giving up, in units of unit

unit - a TimeUnit determining how to interpret the timeout parameter

queueNames - - names of queue

Returns:

the head of this queue, or null if the specified waiting time elapses before an element is available

pollFirst

public V pollFirst(long timeout,
                   TimeUnit unit)
            throws InterruptedException

Specified by:

pollFirst in interface BlockingDeque<V>

Throws:

InterruptedException

pollLastAsync

public RFuture<V> pollLastAsync(long timeout,
                                TimeUnit unit)

Specified by:

pollLastAsync in interface RBlockingDequeAsync<V>

pollLast

public V pollLast(long timeout,
                  TimeUnit unit)
           throws InterruptedException

Specified by:

pollLast in interface BlockingDeque<V>

Throws:

InterruptedException

expire

public boolean expire(long timeToLive,
                      TimeUnit timeUnit)

Description copied from interface: RExpirable

Set a timeout for object. After the timeout has expired, the key will automatically be deleted.

Specified by:

expire in interface RExpirable

Parameters:

timeToLive - - timeout before object will be deleted

timeUnit - - timeout time unit

Returns:

true if the timeout was set and false if not

expireAsync

public RFuture<Boolean> expireAsync(long timeToLive,
                                    TimeUnit timeUnit)

Description copied from interface: RExpirableAsync

Set a timeout for object in async mode. After the timeout has expired, the key will automatically be deleted.

Specified by:

expireAsync in interface RExpirableAsync

Parameters:

timeToLive - - timeout before object will be deleted

timeUnit - - timeout time unit

Returns:

true if the timeout was set and false if not

expireAt

public boolean expireAt(long timestamp)

Description copied from interface: RExpirable

Set an expire date for object. When expire date comes the key will automatically be deleted.

Specified by:

expireAt in interface RExpirable

Parameters:

timestamp - - expire date in milliseconds (Unix timestamp)

Returns:

true if the timeout was set and false if not

expireAtAsync

public RFuture<Boolean> expireAtAsync(long timestamp)

Description copied from interface: RExpirableAsync

Set an expire date for object in async mode. When expire date comes the key will automatically be deleted.

Specified by:

expireAtAsync in interface RExpirableAsync

Parameters:

timestamp - - expire date in seconds (Unix timestamp)

Returns:

true if the timeout was set and false if not

expireAt

public boolean expireAt(Date timestamp)

Description copied from interface: RExpirable

Set an expire date for object. When expire date comes the key will automatically be deleted.

Specified by:

expireAt in interface RExpirable

Parameters:

timestamp - - expire date

Returns:

true if the timeout was set and false if not

expireAtAsync

public RFuture<Boolean> expireAtAsync(Date timestamp)

Description copied from interface: RExpirableAsync

Set an expire date for object in async mode. When expire date comes the key will automatically be deleted.

Specified by:

expireAtAsync in interface RExpirableAsync

Parameters:

timestamp - - expire date

Returns:

true if the timeout was set and false if not

clearExpire

public boolean clearExpire()

Description copied from interface: RExpirable

Clear an expire timeout or expire date for object.

Specified by:

clearExpire in interface RExpirable

Returns:

true if timeout was removed false if object does not exist or does not have an associated timeout

clearExpireAsync

public RFuture<Boolean> clearExpireAsync()

Description copied from interface: RExpirableAsync

Clear an expire timeout or expire date for object in async mode. Object will not be deleted.

Specified by:

clearExpireAsync in interface RExpirableAsync

Returns:

true if the timeout was cleared and false if not

remainTimeToLive

public long remainTimeToLive()

Description copied from interface: RExpirable

Remaining time to live of Redisson object that has a timeout

Specified by:

remainTimeToLive in interface RExpirable

Returns:

time in milliseconds -2 if the key does not exist. -1 if the key exists but has no associated expire.

remainTimeToLiveAsync

public RFuture<Long> remainTimeToLiveAsync()

Description copied from interface: RExpirableAsync

Get remaining time to live of object in seconds.

Specified by:

remainTimeToLiveAsync in interface RExpirableAsync

Returns:

-1 if object does not exist or time in seconds