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# Example: lr_user_data_point_instance

In the following example,lr_start_transaction_instance measures the duration a withdrawal from a bank server. Once the server API call is completed and returns a value to the status variable, the transaction instance is complete. Each successful instance of the transaction is accompanied by a data point instance that records the amount overdrawn with the transaction. This is achieved by passing the instance_id of the transaction to lr_user_data_point_instance.

    int LIMIT=1000;
    long instance_id;
    int amount_overdrawn = get_amount_overdrawn(); /* Call to server API */
    while (amount_overdrawn < LIMIT) {
        /* Notify that a transaction is starting */
        instance_id = lr_start_transaction_instance("withdraw", 0);
        status = bank_withdraw(500); /* Call to server API */
       /* End transaction with operation result - pass or fail */
        if (status == 0)
        {
            /* Before ending the transaction, record the amount
            * overdrawn as a data point and associate it with
            * the specific transaction instance by using the
            * instance's id */
            lr_user_data_point_instance("Amount Overdrawn",
                (double)amount_overdrawn, instance_id);
            lr_end_transaction_instance(instance_id, LR_PASS);
        }
        else
            lr_end_transaction_instance(instance_id, LR_FAIL);
        amount_overdrawn = get_amount_overdrawn();
    }

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