Here is a simple idea.

Various events may be thrown when the server shuts down but in other cases too, like PlayerQuitEvent. onDisable() can also be called when shutting down or when simply disabled for other reason.

That's why I suggest that there is a way to see is the server is currently shutting down.

It would for example allow to execute code synchronously instead of launching asynchronous tasks.

Examples:

• Saving player-related data in PlayerQuitEvent usually done by an async task, but the server may shutdown at that point and kill this task.
• Saving config/files synchronously in onDisable(). Usually you don't need to do anything async here because the server shuts down, but it just slow downs the server if the plugin has actually been disabled dynamically. I'm not sure about that one, maybe the plugin is no longer able to do anything after it has been disabled.

Since forking from the common ancestor https://github.com/Bukkit/Bukkit circa Minecraft 1.7, GlowstoneMC's updated Bukkit (Glowkit) and SpigotMC's updated Bukkit have diverged for new API added to support 1.8.x. There is some overlap, but SpigotMC has API that GlowstoneMC does not, and GlowstoneMC has also has API that SpigotMC does not have either. So I think it would be worth considering whether some of GlowstoneMC's API enhancements could be submitted to the SpigotMC team for inclusion in their updated version of Bukkit, towards the goal of a unified common API.

This would be advantageous for Glowstone since the new APIs would gain more widespread usage, and also for plugin developers since they would be able to target both Glowstone and Spigot with the same API methods, instead of having to code separately for Glowstone and Spigot, when using >1.7 features. A win-win scenario.

SpigotMC could also have feedback before merging which could be used to improve the specific APIs in both places, providing a unified interface to both implementations. Details on their submission process at: https://hub.spigotmc.org - the readme for their specific "Bukkit API" project https://hub.spigotmc.org/stash/projects/SPIGOT/repos/bukkit/browse says "The development team is very open to both bug and feature requests / suggestions". Worth a shot?

Here's a short list of non-conflicting (to my knowledge) APIs developed by GlowstoneMC, I believe would make sense to approach for submission to SpigotMC:

• GlowstoneMC/Glowkit@16cb5d6 Added cause-specific damage methods to Damageable. by @PaulBGD in https://github.com/GlowstoneMC/Glowkit/pull/33
• GlowstoneMC/Glowkit@6ecc135 Updated resource packs for 1.8 changes, with resource pack event. by @Aaron1011 in https://github.com/GlowstoneMC/Glowkit/pull/49
• GlowstoneMC/Glowkit@e2d8849 Added MaterialData for Prismarine, Sand, and Sponge. by @SpaceManiac
• GlowstoneMC/Glowkit@53d3e69 Added missing effects from Minecraft 1.7. by @socram8888 in GlowstoneMC/Glowkit#13
• Tonodus@f9a7fba InventoryView.Property. for enchantments in 1.8 (WIP) by @Tonodus in https://github.com/GlowstoneMC/Glowkit/pull/63
• GlowstoneMC/Glowkit@267a795 Added MaterialData for Dirt, Stone, and DoublePlant. by @jimmikaelkael in https://github.com/GlowstoneMC/Glowkit/pull/29 https://github.com/GlowstoneMC/Glowkit/pull/30 GlowstoneMC/Glowkit#27

Tagging the original authors since it is probably best if they submit their code to SpigotMC if they choose to do so.

This is only an initial list, might have more to add as I progress through the changes.

Note this task issue is only concerning GlowstoneMC → SpigotMC, the reverse direction SpigotMC → GlowstoneMC has a separate issue: GlowstoneMC/Glowkit#18

Spigot has added some useful events and misc changes that we may as well merge into Glowkit. These are:

• PlayerItemDamageEvent
• EntitySpawnEvent and SpawnerSpawnEvent (and edits of others)
• getClickedInventory in InventoryClickEvent
• EntityMountEvent and EntityDismountEvent
• PlayerSpawnLocationEvent

A full changelist for SpigotAPI can be found here (first spigot change is "POM Changes":
https://github.com/SpigotMC/Spigot-API/commits/master

Since the actual Bukkit API isn't being worked on, thought I might as well see if we can get this into Glowkit at some point.

There is an event to tell when a plant block grows - EG, a pumpkin or a melon - But that event doesn't have a way to tell what plant the block grew from.

Even worse, if I'm looking for the plant that grew a pumpkin, I can't even iterate the blocks around it to find the attached plant.

I know Glowstone is incomplete, but, it can be useful to at least add the notion of trading with Merchants into Glowkit.

I used to have a related PR for this: Bukkit#1077

As you can see when reading the PR, it went through many iterations and changes, and finally was very close to being accepted before the Bukkit shutdown.

Add in additional SportBukkit API support.

https://github.com/OvercastNetwork/SportBukkit

Not sure if that's possible, but that's definitely missing. Should investigate.