1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
\name{jengine}
\alias{.jengine}
\title{
Java callback engineCast a Java object to another class
}
\description{
\code{.jengine} obtains the current callback engine or starts it.
}
\usage{
.jengine(start=FALSE, silent=FALSE)
}
\arguments{
\item{start}{if set to \code{TRUE} then the callback engine is started
if it is not yet active}
\item{silent}{if set to \code{TRUE} then NULL is returned if there is
no engine available. Otherwise an error is raised}
}
\value{
Returns a Java object reference (\code{jobjRef}) to the current Java
callback engine.
}
\details{
\code{.jengine} can be used to detect whether the engine was started
or to start the engine.
Before any callbacks from Java into R can be performed, the Java
callback engine must be initialized, loading Java/R Interface
(JRI). If JRI was not started and \code{start} is set to \code{TRUE}
then \code{.jengine} will load necessary classes and start
it.
Note that JRI is an optional part of rJava and requires R shared
library at the moment. By default rJava will continue with
installation even if JRI cannot be built.
}
\seealso{
\code{\link{.jcall}}
}
\examples{
\dontrun{
.jengine(TRUE)
}
}
\keyword{interface}
|
