check whether any registered listener exists or not before publishing event
use Clock
Merge branch 'master' of https://github.com/hazelcast/hazelcast
minor fix add not check
Merge branch 'master' of https://github.com/hazelcast/hazelcast
Minor PortableWriter documentation improvements + removal of final args in interface
doc is updated with a warning about usages of null portables
Grammar revisions to Aggregators doc.
Merge branch 'master' of https://github.com/hazelcast/hazelcast
Merge pull request #2974 from ahmetmircik/fix/3.3/hasRegisteredListener

Fixes #2913 : Prevent extra serialization if there is no registered event listener
make null check before writing recordInfo
Merge branch 'master' of https://github.com/hazelcast/hazelcast
Merge pull request #2984 from sancar/doc/warningOnnullPortables

doc is updated with a warning about usages of null portables
Reviewed update material.
fix for build utils javadoc
Renamed Data to Binary and unified read / writes of this class