Nodejs (Infinispan) : Does Infinispan put method returns null for key inserted in cache for first time?

Question

I have been reviewing the infinispan documentation and overloaded put method returns the value being replaced, or null if nothing is being replaced.

I am using overloaded put method with nodejs and it's not returning expected data, getting undefined.

how can I achieve this with nodejs?

Looked at the documentation, need assistance to understand the behavior with Nodejs

Documentation Link : https://docs.jboss.org/infinispan/9.2/apidocs/org/infinispan/commons/api/BasicCache.html#put-K-V-

V put(K key,
  V value,
  long lifespan,
  TimeUnit unit)

An overloaded form of put(Object, Object), which takes in lifespan parameters.

Parameters:

• key - key to use
• value - value to store
• lifespan - lifespan of the entry. Negative values are interpreted as unlimited lifespan.
• unit - unit of measurement for the lifespan

Returns:

• the value being replaced, or null if nothing is being replaced.

Looked at the documentation, need assistance to understand the behavior with Nodejs

Answer 1

From https://github.com/infinispan/js-client/blob/main/lib/infinispan.js#L327 it looks like put's third argument opts can have property previous that makes it return the old value, so try:

const oldValue = client.put('key', 'value', { previous: true })