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package io.dico.dicore.command.registration.reflect
import io.dico.dicore.command.*
import kotlinx.coroutines.CoroutineStart.UNDISPATCHED
import kotlinx.coroutines.Deferred
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.async
import java.lang.reflect.Method
import java.util.concurrent.CancellationException
import kotlin.coroutines.CoroutineContext
import kotlin.coroutines.intrinsics.intercepted
import kotlin.coroutines.intrinsics.suspendCoroutineUninterceptedOrReturn
import kotlin.reflect.jvm.kotlinFunction
fun isSuspendFunction(method: Method): Boolean {
val func = method.kotlinFunction ?: return false
return func.isSuspend
}
@Throws(CommandException::class)
fun callCommandAsCoroutine(
executionContext: ExecutionContext,
coroutineContext: CoroutineContext,
continuationIndex: Int,
method: Method,
instance: Any?,
args: Array<Any?>
): String? {
// UNDISPATCHED causes the handler to run until the first suspension point on the current thread,
// meaning command handlers that don't have suspension points will run completely synchronously.
// Tasks that take time to compute should suspend the coroutine and resume on another thread.
val job = GlobalScope.async(context = coroutineContext, start = UNDISPATCHED) {
suspendCoroutineUninterceptedOrReturn<Any?> { cont ->
args[continuationIndex] = cont.intercepted()
method.invoke(instance, *args)
}
}
if (job.isCompleted) {
return job.getResult()
}
job.invokeOnCompletion {
val chatHandler = executionContext.address.chatHandler
try {
val result = job.getResult()
chatHandler.sendMessage(executionContext.sender, EMessageType.RESULT, result)
} catch (ex: Throwable) {
chatHandler.handleException(executionContext.sender, executionContext, ex)
}
}
return null
}
@Throws(CommandException::class)
private fun Deferred<Any?>.getResult(): String? {
getCompletionExceptionOrNull()?.let { ex ->
if (ex is CancellationException) {
System.err.println("An asynchronously dispatched command was cancelled unexpectedly")
ex.printStackTrace()
throw CommandException("The command was cancelled unexpectedly (see console)")
}
if (ex is Exception) return ReflectiveCommand.getResult(null, ex)
throw ex
}
return ReflectiveCommand.getResult(getCompleted(), null)
}
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