StartupCountdown (WildFly: EE 28.0.0.Beta1 API)

java.lang.Object
- org.jboss.as.ee.component.deployers.StartupCountdown

```
public final class StartupCountdown
extends Object
```
Countdown tracker with capabilities similar to SE CountDownLatch, but allowing threads to mark and unmark themselves as privileged. Privileged threads, when entering await method, will immediately proceed without checking latch's state. This reentrant behaviour allows to work around situations where there is a possibility of a deadlock.

Author:

Fedor Gavrilov

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class StartupCountdown.Frame

Constructor Summary

Constructors
Constructor Description

StartupCountdown(int count)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addCallback(Runnable callback)`	Executes a lightweight action when the countdown reaches 0.
`void`	`await()`
`void`	`countDown()`
`void`	`countUp(int count)`
`static StartupCountdown.Frame`	`current()`
`StartupCountdown.Frame`	`enter()`
`boolean`	`isPrivileged()`
`static void`	`restore(StartupCountdown.Frame frame)`

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

- Constructor Detail
  - StartupCountdown
```
public StartupCountdown(int count)
```
- Method Detail
  - countDown
```
public void countDown()
```
  - countUp
```
public void countUp(int count)
```
  - await
```
public void await()
           throws InterruptedException
```
    Throws:
    
    InterruptedException
  - addCallback
```
public void addCallback(Runnable callback)
```
    Executes a lightweight action when the countdown reaches 0. If StartupCountdown is not at zero when the method is called, passed callback will be executed by the last thread to call countDown. If StartupCountdown is at zero already, passed callback will be executed immediately by the caller thread.
    
    Parameters:
    
    callback - to execute. Should not be null.
  - isPrivileged
```
public boolean isPrivileged()
```
  - enter
```
public StartupCountdown.Frame enter()
```
  - current
```
public static StartupCountdown.Frame current()
```
  - restore
```
public static void restore(StartupCountdown.Frame frame)
```