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java-sdk/src/main/java/dev/openfeature/sdk/EventBus.java at main · open-feature/java-sdk · GitHub

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package dev.openfeature.sdk;

import java.util.function.Consumer;

/**

* Interface for attaching event handlers.

*/

public interface EventBus<T> {

/**

* Add a handler for the {@link ProviderEvent#PROVIDER_READY} event.

* Shorthand for {@link #on(ProviderEvent, Consumer)}

*

* @param handler behavior to add with this event

* @return this

*/

T onProviderReady(Consumer<EventDetails> handler);

/**

* Add a handler for the {@link ProviderEvent#PROVIDER_CONFIGURATION_CHANGED} event.

* Shorthand for {@link #on(ProviderEvent, Consumer)}

*

* @param handler behavior to add with this event

* @return this

*/

T onProviderConfigurationChanged(Consumer<EventDetails> handler);

/**

* Add a handler for the {@link ProviderEvent#PROVIDER_STALE} event.

* Shorthand for {@link #on(ProviderEvent, Consumer)}

*

* @param handler behavior to add with this event

* @return this

*/

T onProviderError(Consumer<EventDetails> handler);

/**

* Add a handler for the {@link ProviderEvent#PROVIDER_ERROR} event.

* Shorthand for {@link #on(ProviderEvent, Consumer)}

*

* @param handler behavior to add with this event

* @return this

*/

T onProviderStale(Consumer<EventDetails> handler);

/**

* Add a handler for the specified {@link ProviderEvent}.

*

* @param event event type

* @param handler behavior to add with this event

* @return this

*/

T on(ProviderEvent event, Consumer<EventDetails> handler);

/**

* Remove the previously attached handler by reference.

* If the handler doesn't exists, no-op.

*

* @param event event type

* @param handler to be removed

* @return this

*/

T removeHandler(ProviderEvent event, Consumer<EventDetails> handler);

}

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