Re: [infinispan-dev] ConcurrentMap new methods implementation
On 03/22/2017 08:46 PM, Katia Aresti wrote:
Hi all,
Since Java 8, some new methods are available in the ConcurrentMap
interface: merge, compute, computeIfAbsent, computeIfPresent, forEach,
replaceAll. ConcurrentMap interface provides a default implementation.
I'm working on https://issues.jboss.org/browse/ISPN-5728
<https://issues.jboss.org/browse/ISPN-5728> in order to provide the
infinispan specific implementation. The issue here is that to make it
work, these lambdas must be Serializables, so actual code using these
methods and not passing serializables lambdas will break.
I see two possibilities here, please fell free to suggest any other idea.
1) Override the default implementation and specify on the release that
all the lambdas must be serializables from now on ... ?
2) Leave the implementation of the default methods as they are and
provide new methods implemented the infinispan way :
To be consistent with Streams API, we should assume that the lambda is
serializable (and fail as gracefully as we can if it's not and should
be) and provide the SerializableX overload method to make the lambdas
serializable when the lambda is used directly on Cache. I wouldn't leave
the default implementation, because:
1) it's prone to user error, particularly during refactoring. Switching
from functional to default implementation would introduce a regression
in his app's performance
2) For local caches or local-mode operations, the lambda doesn't need to
be serializable
Radim
V compute(K key, Vcompute(K key,
SerializableBiFunction<?super K, ?super V, ?extends V>
remappingFunction)
What do you think ?
-- Katia
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--
Radim Vansa <rvansa(a)redhat.com>
JBoss Performance Team