Package org.exoplatform.caldav.service

Class ContributedBeans<T>

java.lang.Object

org.exoplatform.caldav.service.ContributedBeans<T>

Type Parameters:

T - the extension point's contract

All Implemented Interfaces:

Supplier<List<T>>

public final class ContributedBeans<T>
extends Object
implements Supplier<List<T>>

The beans contributed to one of this add-on's extension points, read one by one so that a contribution which cannot be created reads as absent rather than failing every question asked of the extension point.

A contribution from another web application reaches this one through the Kernel/Spring bridge as a lazy proxy: the bean the proxy stands for is only created when a method of it is first called, and sorting by order is such a call. Read as one ordered stream, a single contribution whose bean fails to be created would make the whole read throw, and with it every caller — a Stalwart-only question as much as a BlueMind one. So each contribution is asked a question of its own first (the probe, its identity on the extension point), then its order, inside its own guard; one that fails either is left out and said so, once per contribution, and the others are sorted by the orders read. A contribution of this web application that the bean factory itself fails to create while listing is left out the same way, and the listing goes on past it.

Constructor Summary

Constructors

Constructor	Description
ContributedBeans(org.springframework.beans.factory.ObjectProvider<T> provider, String kind, Function<T,?> probe)	The reader of one extension point's contributions.

Method Summary

Modifier and Type	Method	Description
List<T>	get()	The contributions that could be created, in their declared order; never throws for a contribution that cannot be.

Methods inherited from class java.lang.Object

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

Constructor Details

ContributedBeans

public ContributedBeans(org.springframework.beans.factory.ObjectProvider<T> provider,
 String kind,
 Function<T,?> probe)

The reader of one extension point's contributions.

Parameters:

provider - the contributions, from every web application; null reads as none

kind - what the log calls one contribution, such as "share channel"

probe - the question each contribution answers before it is kept — its identity on the extension point — which creates the bean a proxy stands for

Method Details

get

public List<T> get()

The contributions that could be created, in their declared order; never throws for a contribution that cannot be.

Specified by:

get in interface Supplier<T>

Returns:

the contributions, never null