[OmniFaces utilities 2.0] List of OmniFaces 2.0 un-serializable Callback interfaces

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[OmniFaces utilities] The Callback represents a collection of un-serializable callback interfaces. Useful in (mini) visitor and strategy patterns.

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In case you don't know, OmniFaces 2.0 comes with a set of un-serializable callback interfaces useful in (mini) visitor and strategy patterns. These interfaces are available in the final class org.omnifaces.util.Callback.
Starting with OmniFaces 2.1 the callback which takes two arguments was removed. For the rest of Callbacks listed below, OmniFaces 2.1 provides a Serializable version. 

Let's see what we have in OmniFaces 2.0:

·         void callback

·         callback which returns a value

·         callback which takes an argument

·         callback which takes two arguments (removed in OmniFaces 2.1)

·         callback which takes one argument and returns one value

Check out the blog Callback submenu to see several examples of using these interfaces to:

- subscribe the given callback to the current application that get invoked every time when the given system event type is published in the current application

- subscribe the given callback to the current view that get invoked every time when the given system event type is published on the current view

- subscribe the given callback instance to the current view that get invoked every time before/after given phase ID

- subscribe the given callback instance to the current request that get invoked before/after given phase ID

- subscribe the given callback instance to the given component that get invoked only in the current request when the given component system event type is published on the given component (only in OmniFaces 2.1)

- unsubscribe the given event listener on the given event from the given component (only in OmniFaces 2.1)

- invoke an operation for each component in the component tree via OmniFaces Components#forEach

- OmniFaces 2.0 - ReadOnlyValueExpression that can be set when the "real" value is not yet available

- OmniFaces 2.1 - ReadOnlyValueExpression that can be set when the "real" value is not yet available (only in OmniFaces 2.1)

- Introducing the OmniFaces Runner Scope

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