Interface LockedStream<K,V>
- All Superinterfaces:
AutoCloseable
,BaseCacheStream<CacheEntry<K,
,V>, LockedStream<K, V>> BaseStream<CacheEntry<K,
V>, LockedStream<K, V>>
- All Known Implementing Classes:
LockedStreamImpl
,TxLockedStreamImpl
forEach(BiConsumer)
where the BiConsumer is invoked while guaranteeing that the entry being passed is properly locked for the
entire duration of the invocation.
An attempt is made to acquire the lock for an entry using the default
LockingConfiguration.lockAcquisitionTimeout()
before invoking any operations on it.
- Since:
- 9.1
- Author:
- wburns
-
Nested Class Summary
Nested classes/interfaces inherited from interface org.infinispan.BaseCacheStream
BaseCacheStream.SegmentCompletionListener
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Method Summary
Modifier and TypeMethodDescriptionDisables tracking of rehash events that could occur to the underlying cache.distributedBatchSize
(int batchSize) Controls how many keys are returned from a remote node when using a stream terminal operation with a distributed cache to back this stream.filter
(Predicate<? super CacheEntry<K, V>> predicate) Returns a locked stream consisting of the elements of this stream that match the given predicate.default LockedStream
<K, V> filter
(SerializablePredicate<? super CacheEntry<K, V>> predicate) Same asfilter(Predicate)
except that the Predicate must also implementSerializable
filterKeys
(Set<?> keys) Filters which entries are returned by only returning ones that map to the given key.filterKeySegments
(IntSet segments) Filters which entries are returned by what segment they are present in.void
forEach
(BiConsumer<Cache<K, V>, ? super CacheEntry<K, V>> biConsumer) Performs an action for each element of this stream on the primary owner of the given key.default void
forEach
(SerializableBiConsumer<Cache<K, V>, ? super CacheEntry<K, V>> biConsumer) Same asforEach(BiConsumer)
except that the BiConsumer must also implementSerializable
invokeAll
(BiFunction<Cache<K, V>, ? super CacheEntry<K, V>, R> biFunction) Performs a BiFunction for each element of this stream on the primary owner of each entry returning a value.invokeAll
(SerializableBiFunction<Cache<K, V>, ? super CacheEntry<K, V>, R> biFunction) Same asinvokeAll(BiFunction)
except that the BiFunction must also implementSerializable
Iterator
<CacheEntry<K, V>> iterator()
This method is not supported when using aLockedStream
This would enable sending requests to all other remote nodes when a terminal operator is performed.This method is not supported when using aLockedStream
This would disable sending requests to all other remote nodes compared to one at a time.This method is not supported when using aLockedStream
Sets the timeout for the acquisition of the lock for each entry.Methods inherited from interface java.util.stream.BaseStream
close, isParallel, onClose, parallel, sequential, unordered
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Method Details
-
filter
Returns a locked stream consisting of the elements of this stream that match the given predicate.This filter is after the lock is acquired for the given key. This way the filter will see the same value as the consumer is given.
- Parameters:
predicate
- predicate- Returns:
- a LockedStream with the filter applied
-
filter
Same asfilter(Predicate)
except that the Predicate must also implementSerializable
The compiler will pick this overload for lambda parameters, making them
Serializable
- Parameters:
predicate
- the predicate to filter out unwanted entries- Returns:
- a LockedStream with the filter applied
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forEach
Performs an action for each element of this stream on the primary owner of the given key.This method is performed while holding exclusive lock over the given entry and will be released only after the consumer has completed. In the function,
entry.setValue(newValue)
is equivalent tocache.put(entry.getKey(), newValue)
.If using pessimistic transactions this lock is not held using a transaction and thus the user can start a transaction in this consumer which also must be completed before returning. A transaction can be started in the consumer and if done it will share the same lock used to obtain the key.
Remember that if you are using an explicit transaction or an async method that these must be completed before the consumer returns to guarantee that they are operating within the scope of the lock for the given key. Failure to do so will lead into possible inconsistency as they will be performing operations without the proper locking.
Some methods on the provided cache may not work as expected. These include
Cache.putForExternalRead(Object, Object)
,AdvancedCache.lock(Object[])
,AdvancedCache.lock(Collection)
, andAdvancedCache.removeGroup(String)
. If these methods are used inside of the Consumer on the cache it will throw aIllegalStateException
. This is due to possible interactions with locks while using these commands.- Parameters:
biConsumer
- the biConsumer to run for each entry under their lock
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forEach
Same asforEach(BiConsumer)
except that the BiConsumer must also implementSerializable
The compiler will pick this overload for lambda parameters, making them
Serializable
- Parameters:
biConsumer
- the biConsumer to run for each entry under their lock
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invokeAll
Performs a BiFunction for each element of this stream on the primary owner of each entry returning a value. The returned value from the function will be sent back to the user mapped to the key that generated it, with all of these stored in a map. Both the BiFunction and the returned value must be Serializable in some way. This method will return only after all entries have been processed.This method is currently marked as
Experimental
since this method returns a Map and requires blocking. This operation could take a deal of time and as such should be done using an asynchronous API. Most likely this return type will be changed to use some sort of asynchronous return value. This method is here until this can be implemented.This BiFunction is invoked while holding an exclusive lock over the given entry that will be released only after the function has completed. In the function,
entry.setValue(newValue)
is equivalent tocache.put(entry.getKey(), newValue)
.If using pessimistic transactions this lock is not held using a transaction and thus the user can start a transaction in this consumer which also must be completed before returning. A transaction can be started in the biFunction and if done it will share the same lock used to obtain the key.
Remember if you are using an explicit transaction or an async method that these must be completed before the consumer returns to guarantee that they are operating within the scope of the lock for the given key. Failure to do so will lead into possible inconsistency as they will be performing operations without the proper locking.
Some methods on the provided cache may not work as expected. These include
Cache.putForExternalRead(Object, Object)
,AdvancedCache.lock(Object[])
,AdvancedCache.lock(Collection)
, andAdvancedCache.removeGroup(String)
. If these methods are used inside of the Consumer on the cache it will throw aIllegalStateException
. This is due to possible interactions with locks while using these commands.- Type Parameters:
R
- the return type- Parameters:
biFunction
- the biFunction to run for each entry under their lock- Returns:
- a map with each key mapped to the value returned from the bi function
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invokeAll
@Experimental default <R> Map<K,R> invokeAll(SerializableBiFunction<Cache<K, V>, ? super CacheEntry<K, V>, R> biFunction) Same asinvokeAll(BiFunction)
except that the BiFunction must also implementSerializable
The compiler will pick this overload for lambda parameters, making them
Serializable
- Type Parameters:
R
- the return type- Parameters:
biFunction
- the biFunction to run for each entry under their lock- Returns:
- a map with each key mapped to the value returned from the bi function
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sequentialDistribution
LockedStream<K,V> sequentialDistribution()This would disable sending requests to all other remote nodes compared to one at a time. This can reduce memory pressure on the originator node at the cost of performance.Parallel distribution is enabled by default except for
CacheStream.iterator()
andCacheStream.spliterator()
- Specified by:
sequentialDistribution
in interfaceBaseCacheStream<K,
V> - Returns:
- a stream with parallel distribution disabled
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parallelDistribution
LockedStream<K,V> parallelDistribution()This would enable sending requests to all other remote nodes when a terminal operator is performed. This requires additional overhead as it must process results concurrently from various nodes, but should perform faster in the majority of cases.Parallel distribution is enabled by default except for
CacheStream.iterator()
andCacheStream.spliterator()
- Specified by:
parallelDistribution
in interfaceBaseCacheStream<K,
V> - Returns:
- a stream with parallel distribution enabled.
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filterKeySegments
Filters which entries are returned by what segment they are present in. This method can be substantially more efficient than using a regularCacheStream.filter(Predicate)
method as this can control what nodes are asked for data and what entries are read from the underlying CacheStore if present.- Specified by:
filterKeySegments
in interfaceBaseCacheStream<K,
V> - Parameters:
segments
- The segments to use for this stream operation. Any segments not in this set will be ignored.- Returns:
- a stream with the segments filtered.
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filterKeys
Filters which entries are returned by only returning ones that map to the given key. This method will be faster than a regularCacheStream.filter(Predicate)
if the filter is holding references to the same keys.- Specified by:
filterKeys
in interfaceBaseCacheStream<K,
V> - Parameters:
keys
- The keys that this stream will only operate on.- Returns:
- a stream with the keys filtered.
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distributedBatchSize
Controls how many keys are returned from a remote node when using a stream terminal operation with a distributed cache to back this stream. This value is ignored when terminal operators that don't track keys are used. Key tracking terminal operators areCacheStream.iterator()
,CacheStream.spliterator()
,CacheStream.forEach(Consumer)
. Please see those methods for additional information on how this value may affect them.This value may be used in the case of a a terminal operator that doesn't track keys if an intermediate operation is performed that requires bringing keys locally to do computations. Examples of such intermediate operations are
CacheStream.sorted()
,CacheStream.sorted(Comparator)
,CacheStream.distinct()
,CacheStream.limit(long)
,CacheStream.skip(long)
This value is always ignored when this stream is backed by a cache that is not distributed as all values are already local.
- Specified by:
distributedBatchSize
in interfaceBaseCacheStream<K,
V> - Parameters:
batchSize
- The size of each batch. This defaults to the state transfer chunk size.- Returns:
- a stream with the batch size updated
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disableRehashAware
LockedStream<K,V> disableRehashAware()Disables tracking of rehash events that could occur to the underlying cache. If a rehash event occurs while a terminal operation is being performed it is possible for some values that are in the cache to not be found. Note that you will never have an entry duplicated when rehash awareness is disabled, only lost values.Most terminal operations will run faster with rehash awareness disabled even without a rehash occuring. However if a rehash occurs with this disabled be prepared to possibly receive only a subset of values.
- Specified by:
disableRehashAware
in interfaceBaseCacheStream<K,
V> - Returns:
- a stream with rehash awareness disabled.
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timeout
Sets the timeout for the acquisition of the lock for each entry.- Specified by:
timeout
in interfaceBaseCacheStream<K,
V> - Parameters:
time
- the maximum time to waitunit
- the time unit of the timeout argument- Returns:
- a LockedStream with the timeout applied
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segmentCompletionListener
LockedStream<K,V> segmentCompletionListener(BaseCacheStream.SegmentCompletionListener listener) throws UnsupportedOperationException This method is not supported when using aLockedStream
- Specified by:
segmentCompletionListener
in interfaceBaseCacheStream<K,
V> - Parameters:
listener
- The listener that will be called back as segments are completed.- Returns:
- a stream with the listener registered.
- Throws:
UnsupportedOperationException
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iterator
This method is not supported when using aLockedStream
- Specified by:
iterator
in interfaceBaseStream<K,
V> - Throws:
UnsupportedOperationException
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spliterator
This method is not supported when using aLockedStream
- Specified by:
spliterator
in interfaceBaseStream<K,
V> - Throws:
UnsupportedOperationException
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