IteratingNestedCallback (Jetty :: Project 9.4.46.v20220331 API)

java.lang.Object
- org.eclipse.jetty.util.IteratingCallback
- - org.eclipse.jetty.util.IteratingNestedCallback

All Implemented Interfaces:

Callback, Invocable
```
public abstract class IteratingNestedCallback
extends IteratingCallback
```
Iterating Nested Callback.
This specialized callback is used when breaking up an asynchronous task into smaller asynchronous tasks. A typical pattern is that a successful callback is used to schedule the next sub task, but if that task completes quickly and uses the calling thread to callback the success notification, this can result in a growing stack depth.

To avoid this issue, this callback uses an AtomicBoolean to note if the success callback has been called during the processing of a sub task, and if so then the processing iterates rather than recurses.

This callback is passed to the asynchronous handling of each sub task and a call the IteratingCallback.succeeded() on this call back represents completion of the subtask. Only once all the subtasks are completed is the Callback.succeeded() method called on the Callback instance passed the the IteratingNestedCallback(Callback) constructor.

Nested Class Summary
- Nested classes/interfaces inherited from class org.eclipse.jetty.util.IteratingCallback
  IteratingCallback.Action
- Nested classes/interfaces inherited from interface org.eclipse.jetty.util.Callback
  Callback.Completable, Callback.Completing, Callback.Nested
- Nested classes/interfaces inherited from interface org.eclipse.jetty.util.thread.Invocable
  Invocable.InvocationType

Field Summary
- Fields inherited from interface org.eclipse.jetty.util.Callback
  NOOP
- Fields inherited from interface org.eclipse.jetty.util.thread.Invocable
  __nonBlocking

Constructor Summary

Constructors
Constructor Description

IteratingNestedCallback(Callback callback)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Invocable.InvocationType`	`getInvocationType()`
`protected void`	`onCompleteFailure(java.lang.Throwable x)`	Invoked when the overall task has completed with a failure.
`protected void`	`onCompleteSuccess()`	Invoked when the overall task has completed successfully.
`java.lang.String`	`toString()`

Methods inherited from class org.eclipse.jetty.util.IteratingCallback
close, failed, isClosed, isFailed, isSucceeded, iterate, process, reset, succeeded

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

- Constructor Detail
  - IteratingNestedCallback
```
public IteratingNestedCallback(Callback callback)
```
- Method Detail
  - getInvocationType
```
public Invocable.InvocationType getInvocationType()
```
    Returns:
    
    The InvocationType of this object
  - onCompleteSuccess
```
protected void onCompleteSuccess()
```
    Description copied from class: IteratingCallback
    
    Invoked when the overall task has completed successfully.
    
    Overrides:
    
    onCompleteSuccess in class IteratingCallback
    
    See Also:
    
    IteratingCallback.onCompleteFailure(Throwable)
  - onCompleteFailure
```
protected void onCompleteFailure(java.lang.Throwable x)
```
    Description copied from class: IteratingCallback
    
    Invoked when the overall task has completed with a failure.
    
    Overrides:
    
    onCompleteFailure in class IteratingCallback
    
    Parameters:
    
    x - the throwable to indicate cause of failure
    
    See Also:
    
    IteratingCallback.onCompleteSuccess()
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class IteratingCallback