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package com.atlarge.opendc.simulator
import kotlin.coroutines.experimental.intrinsics.suspendCoroutineOrReturn
/**
* Try to find the [Context] instance associated with the [Process] in the call chain which has (indirectly) invoked the
* caller of this method.
*
* Note however that this method does not guarantee type-safety as this method allows the user to cast to a context
* with different generic type arguments.
*
* @return The context that has been found or `null` if this method is not called in a simulation context.
*/
suspend fun <S, M> contextOrNull(): Context<S, M>? = suspendCoroutineOrReturn { it.context[Context] }
/**
* Find the [Context] instance associated with the [Process] in the call chain which has (indirectly) invoked the
* caller of this method.
*
* Note however that this method does not guarantee type-safety as this method allows the user to cast to a context
* with different generic type arguments.
*
* @throws IllegalStateException if the context cannot be found.
* @return The context that has been found.
*/
suspend fun <S, M> context(): Context<S, M> =
contextOrNull() ?: throw IllegalStateException("The suspending call does not have an associated process context")
/**
* Try to find the untyped [Context] instance associated with the [Process] in the call chain which has (indirectly)
* invoked the caller of this method.
*
* @return The untyped context that has been found or `null` if this method is not called in a simulation context.
*/
suspend fun untypedContextOrNull(): Context<*, *>? = contextOrNull<Any?, Any?>()
/**
* Find the [Context] instance associated with the [Process] in the call chain which has (indirectly) invoked the
* caller of this method.
*
* @throws IllegalStateException if the context cannot be found.
* @return The untyped context that has been found.
*/
suspend fun untypedContext(): Context<*, *> = context<Any?, Any?>()
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