# Fabric Events Lifecycle (V0)

## Drafting note - Not in final draft
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## This module is deprecated; you should migrate to [Fabric Lifecycle Events (V1)](/d-7hLof6SNKTHvKBsmNAmg)

Below is details on how to migrate:

### `WorldTickCallback`

This event has been replaced by an event specifcally for world ticking on a logical server or client.

#### For a server worlds

For mods which listen to a world ticking on a logical server, `ServerTickEvents.END_WORLD_TICK` should be used.

For example, the below method may have been used to call logic when a server world has ticked.

public void onInitialize() {
    WorldTickCallback.EVENT.register(world -> {
        // Only call on logical server
        if (!world.isClient()) {
            ...
        }
    });
}

Would become the following:

public void onInitialize() {
    ServerTickEvents.END_WORLD_TICK.register((server, world) -> {
        ...
    });
}

The logical side check can be omited since the new event is only called on a logical server.

TODO: finish other migration tutorials in the listing.