// given Pool<T> pool
Mono<PooledRef<T>> grabResource = pool.acquire();
//no resource is actually requested yet at this point
grabResouce.subscribe();
//now one resource is requested from the pool asynchronously
//Another example, this time synchronously acquiring, immediately followed up by a release:
PooledRef<T> ref = grabResource.block(); //second subscription requests a second resource
ref.release().block(); //release() is also asynchronous and lazy

//given at DbConnection type and a Pool<DbConnection> pool
pool.withPoolable(resource -> resource
    //we declare using the connection to create a Statement...
    .createStatement()
    //...then performing a SELECT query...
    .flatMapMany(st -> st.query("SELECT * FROM foo"))
    //...then marshalling the rows to JSON
    .map(row -> rowToJson(row))
    //(all of which need the live resource)
)
//at this point the rest of the steps are outside the scope
//so the resource can be released
.map(json -> sanitize(json));