ThreadLocalUtil (Keikai Spreadsheet Build 6.0.0 API)

java.lang.Object
- org.apache.poi.util.ThreadLocalUtil

```
public class ThreadLocalUtil
extends Object
```
Small utility to allow to remove references held in ThreadLocals. This is sometimes necessary, e.g. when returning threads into a global thread pool. For each usage of ThreadLocal, a cleaner is registered via registerCleaner().

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`clearAllThreadLocals()`	Clear `ThreadLocal`s of the current thread.
`static void`	`registerCleaner(Runnable cleaner)`	Intended for internal use only so other modules of Apache POi can add cleaners.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - clearAllThreadLocals
```
public static void clearAllThreadLocals()
```
    Clear ThreadLocals of the current thread. This can be used to clean out a thread before "returning" it to a thread-pool or a Web-Container like Tomcat. Usually org.apache.xmlbeans.ThreadLocalUtil#clearAllThreadLocals() should be called as well to clear out some more ThreadLocals which are created by the XMLBeans library internally.
  - registerCleaner
```
@Internal
public static void registerCleaner(Runnable cleaner)
```
    Intended for internal use only so other modules of Apache POi can add cleaners.
    
    Parameters:
    
    cleaner - a runnable which clears some thread-local that is located outside of the "poi" module.