fix the Vert.x event loop integration #1103
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The Vert.x event loop integration used to assume that all Vert.x threads always have a current context associated. That isn't necessarily true, especially in case of worker threads, where a task can easily be submitted to the worker thread pool as an ordinary thread pool, outside of a Vert.x context. In that case, the thread cannot be treated as an event loop. Additionally, this commit synchronizes the thread offload fallback function with the thread offload strategy, so that if there's an event loop remembered, the fallback is executed on it instead of the main executor.
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The Vert.x event loop integration used to assume that all Vert.x threads always have a current context associated. That isn't necessarily true, especially in case of worker threads, where a task can easily be submitted to the worker thread pool as an ordinary thread pool, outside of a Vert.x context. In that case, the thread cannot be treated as an event loop.
Additionally, this commit synchronizes the thread offload fallback function with the thread offload strategy, so that if there's an event loop remembered, the fallback is executed on it instead of the main executor.