In a high-throughput application that processes messages, if the order of message processing is crucial, how would you design your threading model to ensure that messages are processed in order, even when multiple threads are being utilized?
- Use a single-threaded executor or a fixed-size thread pool with a single thread to process messages sequentially.
- Implement a custom message queue with a single worker thread that dequeues and processes messages in order.
- Assign each message a unique identifier, and use a priority queue with a comparator based on the message order.
- Utilize a multi-threaded executor with thread-safe synchronization mechanisms to ensure ordered message processing.
To ensure that messages are processed in order, a single-threaded executor or a fixed-size thread pool with only one thread can be used. This guarantees sequential processing. Other options may provide parallelism but won't guarantee order. Option 2 is a viable solution but not the most straightforward. Options 3 and 4 don't directly address the need for ordered processing.
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