invoke {sparklyr}

Invoke a Method on a JVM Object

Description

Invoke methods on Java object references. These functions provide a mechanism for invoking various Java object methods directly from R.

Usage

invoke(jobj, method, ...)

invoke_static(sc, class, method, ...)

invoke_new(sc, class, ...)

Arguments

jobj

An R object acting as a Java object reference (typically, a spark_jobj).

method

The name of the method to be invoked.

...

Optional arguments, currently unused.

sc

A spark_connection.

class

The name of the Java class whose methods should be invoked.

Details

Use each of these functions in the following scenarios:

invoke	Execute a method on a Java object reference (typically, a spark_jobj).
invoke_static	Execute a static method associated with a Java class.
invoke_new	Invoke a constructor associated with a Java class.

Examples

sc <- spark_connect(master = "spark://HOST:PORT")
spark_context(sc) %>%
  invoke("textFile", "file.csv", 1L) %>%
  invoke("count")