parameterTypes)- Using getDeclaredMethod() you can get a Method getMethods()- This method returns an array containing Method objects for all the public methods of the class even.As method arguments pass the method name and the type of Specified public member method of the class (instance or static). parameterTypes)- Using getMethod() you can get a Method object for the Method or get all the methods of the class in an array. (instance of the class in which method is defined) you can invoke one of the following methods to get an instance of a single In order to invoke a method first thing you need to do is to get an instance of the Method. You can even call a private method using reflection. # Invoking sparklyr.In this post we’ll see how to invoke a method at runtime using Java reflection API. # Invoking sparklyr.SQLUtils createStructType # Invoking sparklyr.SQLUtils createStructField # Invoking .java.JavaSparkContext fromSparkContext Sparklyr :: spark_disconnect(sc) config <- sparklyr :: spark_config() config $ <- "cat" suppressMessages() # Invoking sparklyr.Shell getBackend # "getExecutorThreadDump" "getLocalProperties" # "getExecutorIds" "getExecutorMemoryStatus" # "eventLogger" "executorAllocationManager" # "dagScheduler_$eq" "defaultMinPartitions" # "binaryFiles$default$2" "binaryRecords" ![]() # "addSparkListener" "applicationAttemptId" # "$lessinit$greater$default$5" "accumulable" ScMethods % spark_context() %>% getAvailableMethods() scMethodNames <- sort( unique( names(scMethods))) head(scMethodNames, 60) # "$lessinit$greater$default$3" "$lessinit$greater$default$4" Let us write a small wrapper that will return some of the method’s details in a more readable fashion, for instance the return type and an overview of parameters. This is a good result, but the output is not very user-friendly from the R user perspective. We can see that the invoke() chain has returned a list of Java object references, each of them of class. # public scala.Option .org$apache$spark$SparkContext$$_ui() # public scala.Option .org$apache$spark$SparkContext$$_progressBar() # public .org$apache$spark$SparkContext$$_env() # public .org$apache$spark$SparkContext$$_conf() # public .CallSite .org$apache$spark$SparkContext$$creationSite() Mthds % spark_context() %>% invoke( "getClass") %>% invoke( "getMethods") head(mthds) # ]
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