Method OnCreated

test/brpc_event_dispatcher_unittest.cpp:66–71

        , _additional_ref_released(false) {}

    int OnCreated() {
        count.store(1, butil::memory_order_relaxed);
        _additional_ref_released = false;
        g_user_data = this;
        return 0;
    }

    void BeforeRecycled() {
        count.store(0, butil::memory_order_relaxed);