Package dev.frostlake.executor.udf

Class UdfConsoleCapture

java.lang.Object

dev.frostlake.executor.udf.UdfConsoleCapture

public final class UdfConsoleCapture
extends Object

Routes a JVM-handler UDF's console output (System.out/System.err written on the invoking thread) into the engine log instead of the embedder's console. Snowflake never surfaces a UDF's console output to the SQL client — e.g. an ANTLR-based handler's default error listener printing line 1:1 missing '\n' at … on every recovered parse — so an embedder's test run should not see it either; it lands here as dev.frostlake.udf.console INFO lines.

Installation swaps System.out/System.err for pass-through wrappers (UdfConsoleStream) the first time a handler runs; threads outside enter()/ exit() write through to the original streams byte-for-byte. A test harness may replace the system streams between tests (Surefire does), so enter() re-installs when the wrapper has been displaced. The relay guard stops recursion when the log appender itself writes to the console.

Method Summary

Modifier and Type	Method	Description
static void	enter()	Mark the current thread as executing a UDF handler; console writes are captured until exit().
static void	exit()	Leave the handler scope entered by enter() (call from a finally block).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

enter

public static void enter()

Mark the current thread as executing a UDF handler; console writes are captured until exit().

exit

public static void exit()

Leave the handler scope entered by enter() (call from a finally block).