Package org.infinispan.stream.impl

Class TxLockedStreamImpl<K,V>

java.lang.Object
org.infinispan.stream.impl.LockedStreamImpl<K,V>
org.infinispan.stream.impl.TxLockedStreamImpl<K,V>
All Implemented Interfaces:
AutoCloseable, BaseStream<CacheEntry<K,V>,LockedStream<K,V>>, BaseCacheStream<CacheEntry<K,V>,LockedStream<K,V>>, LockedStream<K,V>
public class TxLockedStreamImpl<K,V> extends LockedStreamImpl<K,V>
Locked Stream that is designed for transactions. This way it can suspend and resume the transaction upon invocation.
Since:
9.0
Author:
wburns

  • Constructor Details

    • TxLockedStreamImpl

      public TxLockedStreamImpl(javax.transaction.TransactionManager tm, CacheStream<CacheEntry<K,V>> realStream, long time, TimeUnit unit)

  • Method Details

    • forEach

      public void forEach(BiConsumer<Cache<K,V>,? super CacheEntry<K,V>> biConsumer)
      Description copied from interface: LockedStream
      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 to cache.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), and AdvancedCache.removeGroup(String). If these methods are used inside of the Consumer on the cache it will throw a IllegalStateException. This is due to possible interactions with locks while using these commands.

      Specified by:
      forEach in interface LockedStream<K,V>
      Overrides:
      forEach in class LockedStreamImpl<K,V>
      Parameters:
      biConsumer - the biConsumer to run for each entry under their lock

    • invokeAll

      public <R> Map<K,R> invokeAll(BiFunction<Cache<K,V>,? super CacheEntry<K,V>,R> biFunction)
      Description copied from interface: LockedStream
      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 to cache.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), and AdvancedCache.removeGroup(String). If these methods are used inside of the Consumer on the cache it will throw a IllegalStateException. This is due to possible interactions with locks while using these commands.

      Specified by:
      invokeAll in interface LockedStream<K,V>
      Overrides:
      invokeAll in class LockedStreamImpl<K,V>
      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