In reply to UVM_LOVE:
I don’t understand your question.
The uvm_tlm_analysis_fifo is a class with a fifo and an internal write() method. When the connected analysis_port calls write(), the analysis_fifo will take the written item and push it to the fifo. You can then get() the transactions from the fifo as required.
Since the write() method is internal to the analysis_fifo, there is no requirement for you to implement a write() function.
What is not working in your first implementation?