Controlling message output

1. A computer-implemented method, comprising: calculating a duration to transmit a plurality of messages;

transmitting a first request based on the calculated duration, wherein the first request is a request for reserving a time period to transmit, the time period being set between an obtained next available time for reservation and sum of the obtained next available time for reservation and the calculated duration, to transmit; and

in response to receiving an approval of the first request:

for each message in the plurality of messages, calculating a time of transmission;

determining that a current time is on or after a particular time of transmission for a particular message;

in response to determining that the current time is on or after the particular time of transmission for the particular message, transmitting a second request to a controller, wherein the second request is a request for permission to transmit the particular message, wherein the controller determines an approval of the second request when a number of transmission links associated with

a server which the particular message is intended to be transmitted to is smaller than a predetermined number; and

in response to receiving an approval of the second request, transmitting the particular message; and

in response to receiving a denial of the first request:

calculating an updated time period to transmit based on an updated next available time for reservation, wherein the denial of the first request includes the updated next available time for reservation; and

transmitting another request for reserving the updated time period to transmit.

2. The method of claim 1 , wherein the duration is calculated based on number of messages in the plurality of messages and a transmitting interval between two consecutive messages in the plurality of messages.

3. The method of claim 1 , further comprising, in response to receiving a denial of the second request:

obtaining a next available time for requesting permission;

determining that the current time exceeds the next available time for requesting permission; and

in response to determining that the current time exceeds the next available time for requesting permission, retransmitting the second request.

4. A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations comprising:

calculating a duration to transmit a plurality of messages;

transmitting a first request based on the calculated duration, wherein the first request is a request for reserving a time period to transmit, the time period being set between an obtained next available time for reservation and sum of the obtained next available time for reservation and the calculated duration, to transmit; and

in response to receiving an approval of the first request:

for each message in the plurality of messages, calculating a time of transmission;

determining that a current time is on or after a particular time of transmission for a particular message;

in response to determining that the current time is on or after the particular time of transmission for the particular message, transmitting a second request to a controller, wherein the second request is a request for permission to transmit the particular message, wherein the controller determines an approval of the second request when a number of transmission links associated with

a server which the particular message is intended to be transmitted to is smaller than a predetermined number; and

in response to receiving an approval of the second request, transmitting the particular message; and

in response to receiving a denial of the first request;

calculating an updated time period to transmit based on an updated next available time for reservation, wherein the denial of the first request includes the updated next available time for reservation; and

transmitting another request for reserving the updated time period to transmit.

5. The non-transitory, computer-readable medium of claim 4 , wherein the duration is calculated based on number of messages in the plurality of messages and a transmitting interval between two consecutive messages in the plurality of messages.

6. The non-transitory, computer-readable medium of claim 4 , the operations further comprising, in response to receiving a denial of the second request:

obtaining a next available time for requesting permission;

determining that the current time exceeds the next available time for requesting permission; and

in response to determining that the current time exceeds the next available time for requesting permission, retransmitting the second request.

7. A computer-implemented system, comprising: one or more computers; and

one or more computer memory devices interoperably coupled with the one or more computers and having tangible, non-transitory, machine-readable media storing instructions that, when executed by the one or more computers, perform operations comprising: calculating a duration to transmit a plurality of messages;

transmitting a first request based on the calculated duration, wherein the first request is a request for reserving a time period to transmit, the time period being set between an obtained next available time for reservation and sum of the obtained next available time for reservation and the calculated duration, to transmit; and in response to receiving an approval of the first request:

for each message in the plurality of messages, calculating a time of transmission;

determining that a current time is on or after a particular time of transmission for a particular message;

in response to determining that the current time is on or after theffall particular time of transmission for the particular message, transmitting a second request to a controller, wherein the second request is a request for permission to transmit the particular message, wherein the controller determines an approval of the second request when a

number of transmission links associated with a server which the particular message is intended to be transmitted to is smaller than a predetermined number; and

in response to receiving an approval of the second request, transmitting the particular message; and

in response to receiving a denial of the first request:

calculating an updated time period to transmit based on an updated next available time for reservation, wherein the denial of the first request includes the updated next available time for reservation; and

transmitting another request for reserving the updated time period to transmit.

8. The system of claim 7 , wherein the duration is calculated based on number of messages in the plurality of messages and a transmitting interval between two consecutive messages in the plurality of messages.

9. The system of claim 7 , the operations further comprising, in response to receiving a denial of the second request:

obtaining a next available time for requesting permission;

determining that the current time exceeds the next available time for requesting permission; and

in response to determining that the current time exceeds the next available time for requesting permission, retransmitting the second request.

10. The method of claim 1 , further comprising:

in response to receiving a denial of the first request, receiving information related to a plurality of denials comprising the denial of the first request, wherein a quantity of the plurality of denials is greater than a predetermined number.

11. The method of claim 3 , further comprising:

determining whether the current time is before a sum of the particular time of transmission and an expiration time; and

in response to determining that the current time is before the sum of the particular time of transmission and the expiration time, retransmitting the second request.

12. The method of claim 1 , further comprising:

monitoring an output queue periodically to determine whether the current time is on or after the time of transmission for each message in the plurality of messages, wherein the output queue stores the plurality of messages.