[Firebase AI] Fix Chat history append locking
#15115
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This commit introduces a new `appendHistory` method to the `Chat` class to provide a thread-safe way of appending to the chat history. The following changes were made: - A new `appendHistory` method was added to the `Chat` class. - All direct calls to `history.append` were replaced with calls to the new `appendHistory` method. This ensures that all modifications to the chat history are protected by a lock, preventing potential race conditions.
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Added an
appendHistorymethod to theChatclass and replaced all direct calls tohistory.appendwithappendHistory. Theappendcall on thehistoryarray is mutating and it was occurring outside the lock.Note:
Chatstill isn't completely thread-safe since parallelsendMessageorsendMessageStreamcalls could update the history in an arbitrary order.#no-changelog