write ResourceResolver.commit asynchronously?

UweG

05-05-2019

Hi to everybody,

I write a lot of values into JCR /var/xxx and close the operation with a ResourceResolver commit and a refresh.

My question was: does AEM perform the persistance operation asynchronously and should I wait with a EventHandler for these values? Or is it possible to continue without waiting?

Thanks in advance

Uwe

Accepted Solutions (1)

Accepted Solutions (1)

Answers (3)

Answers (3)

Jörg_Hoh

Employee

06-05-2019

Hi Uwe,

Actually it's both synchronous and asynchronous 🙂

The write to the repository is happening synchronous. That means that after the .commit() returned you can read the data from the repository. Also the property indexes are updated synchronously.

But the lucene indexes are updated asnychronously. That means that a JCR query immediately after the commit() might return the nodes you have just updated (depending on the type of the index which is used for that specific JCR query).

HTH,

Jörg

UweG

06-05-2019

Hi,

thanks for clarification. Does perform .commit() a synchronious write into JCR?

This means, when I wake up the 2nd thread instantly after calling .commit() and when thread 2 is reading the data after calling resourceResolver.refresh(), get thread 2 all data? Or is it neccessary to sync thread 2 with a EventListener on JCR Level?

Thx

Uwe

Arun_Patidar

MVP

06-05-2019

A ResourceResolver is generally not thread safe! As a consequence, an application which uses the resolver, its returned resources and/or objects resulting from adapting either the resolver or a resource, must provide proper synchronization to ensure no more than one thread concurrently operates against a single resolver, resource or resulting objects.

ResourceResolver (Apache Sling 10 API)