This change breaks pretty much all API pertaining to synchronous task scheduling.
Significant changes:
- Server->getScheduler() has been removed
- Plugin->getScheduler() has been added - every plugin now has its own scheduler
- Because schedulers are now per-plugin, it is now unnecessary for PluginTask to exist because stopping plugin tasks on plugin disable is as simple as destroying the plugin's scheduler. Therefore PluginTask has now been removed and it is expected for things to now use the base Task class instead.
For the most part, plugins will simply need to change Plugin->getServer()->getScheduler()->... to Plugin->getScheduler()->...
Another highlight is that plugin tasks now no longer have global IDs - they are unique to each scheduler.
This commit contains quite a few breaking changes with respect to how AsyncTasks are handled. This is necessary to allow separation of the ServerScheduler and the AsyncPool, because in the future the ServerScheduler may be removed and instead there will be isolated per-plugin sync-task schedulers - but we cannot have every plugin with its own worker pool for memory usage reasons if nothing else.
The following things have changed:
- ServerScheduler: scheduleAsyncTask(), scheduleAsyncTaskToWorker(), getAsyncTaskPoolSize(), increaseAsyncTaskPoolSize() and similar methods have all been removed. Additionally the static \$WORKERS field has been removed.
- Server: added API method getAsyncPool(). This grants you direct access to the server's AsyncPool. Calls to getScheduler()->scheduleAsyncTask() and scheduleAsyncTaskToWorker() should be replaced with getAsyncPool()->submitTask() and submitTaskToWorker() respectively.
this implementation was god-awful bad and it was entirely avoidable to make it this complicated.
This utilizes the fact that pthreads treats static properties as thread-local. AsyncTask local storage now utilizes a \SplObjectStorage stored in an AsyncTask private static field.
Code dependencies can be seen in the code and in the composer.json file. Besides, there are additional third-party libraries used by PocketMine-MP now which are not listed in this section, and I don't plan to maintain it...
Once upon a time, these userland functions were faster than calling builtins, but not anymore. According to my test the Math functions are twice slower in PHP 7.2 with typehints and 50% slower without typehints.
Inlining is slightly faster than using builtins, but the difference is very small - not worth making the code look any more ugly than it does already.
This is the same bug that Entity->getBlocksAround() had, except this actually checks for BB intersections. What this means is that as a result of the bug, one extra layer of blocks is unnecessarily checked on the max sides of the BB.
For example:
Assume you have a BB with maxY -5.5
You're definitely colliding with block -6 (because you're inside it) and you want to check an extra block in case you hit something weird like a fence.
So you want to check _at most_ up to block -5 (inclusive).
Following this maths:
-5.5 + 1 = -4.5
ceil(-4.5) = -4
This causes us to check block -4 unnecessarily. This may be a performance waste - depending on the BB size it could be proportionally a lot of blocks getting unnecessarily checked. This has not been benchmarked.
these are items that do nothing and/or are only used for crafting. As such they are simple to add.
Others will be added later on, but others require extra work and/or reverse engineering which I don't have time for now.
