Package io.camunda.zeebe.util.jar

Class ThreadContextUtil

java.lang.Object

io.camunda.zeebe.util.jar.ThreadContextUtil

public final class ThreadContextUtil
extends Object

A collection of utilities to run an arbitrary Runnable with a specific thread context class loader. This is required when side loading external code via the ExternalJarClassLoader, as that code may be using the Thread.getContextClassLoader().

As the same thread may be reused, it's also important to reset the thread afterwards to avoid operations being run on the wrong class loader.

Constructor Summary

Constructors

Constructor	Description
ThreadContextUtil()

Method Summary

Modifier and Type	Method	Description
static <V> V	callWithClassLoader(Callable<V> callable, ClassLoader classLoader)	Executes the given callable, swapping the thread context class loader for the given class loader, and swapping it back with the previous class loader afterwards.
static void	runCheckedWithClassLoader(CheckedRunnable runnable, ClassLoader classLoader)	Executes the given runnable, swapping the thread context class loader for the given class loader, and swapping it back with the previous class loader afterwards.
static void	runWithClassLoader(Runnable runnable, ClassLoader classLoader)	Executes the given runnable, swapping the thread context class loader for the given class loader, and swapping it back with the previous class loader afterwards.

Methods inherited from class java.lang.Object

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

Constructor Details

ThreadContextUtil

public ThreadContextUtil()

Method Details

runWithClassLoader

public static void runWithClassLoader(Runnable runnable,
 ClassLoader classLoader)

Executes the given runnable, swapping the thread context class loader for the given class loader, and swapping it back with the previous class loader afterwards.

Parameters:

runnable - the operation to execute

classLoader - the class loader to temporarily assign to the current thread's context class loader

runCheckedWithClassLoader

public static void runCheckedWithClassLoader(CheckedRunnable runnable,
 ClassLoader classLoader)
                                      throws Exception

Executes the given runnable, swapping the thread context class loader for the given class loader, and swapping it back with the previous class loader afterwards.

Use this method if you want your operation to throw exceptions; the class loader is guaranteed to be reset even if an exception is thrown.

Parameters:

runnable - the operation to execute

classLoader - the class loader to temporarily assign to the current thread's context class loader

Throws:

Exception

callWithClassLoader

public static <V> V callWithClassLoader(Callable<V> callable,
 ClassLoader classLoader)
                                 throws Exception

Executes the given callable, swapping the thread context class loader for the given class loader, and swapping it back with the previous class loader afterwards.

Parameters:

callable - the operation to execute

classLoader - the class loader to temporarily assign to the current thread's context class loader

Throws:

Exception