Package org.eclipse.jetty.util

Class IteratingNestedCallback

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, Invocable.ReadyTask, Invocable.Task

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

Modifier and Type	Method	Description
Invocable.InvocationType	getInvocationType()
protected void	onCompleteFailure(Throwable x)	Invoked when the overall task has completed with a failure.
protected void	onCompleteSuccess()	Invoked when the overall task has completed successfully.
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

Methods inherited from interface org.eclipse.jetty.util.Callback

completeWith

Constructor Details

IteratingNestedCallback

public IteratingNestedCallback(Callback callback)

Method Details

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(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 String toString()

Overrides:

toString in class IteratingCallback