Method and system for keeping interest alive in a content centric network
One embodiment provides a system that facilitates a content requesting device to handle a potential timeout event. During operation, the system receives, by a content producing device, a packet that corresponds to a first Interest message from a content requesting device, where the first Interest includes a name. Responsive to determining that additional time is required to generate a matching Content Object for the first Interest, the system generates a notification message which indicates a time period after which a second Interest is to be sent out by the content requesting device. The name for the second Interest can be the same as the name for the first Interest or a new name as indicated in the notification message. The system transmits the notification message to the content requesting device, thereby facilitating the content requesting device to handle a potential timeout event.
1. A computer-implemented method for forwarding packets, the method comprising:
receiving, by an intermediate router, a packet that corresponds to a first Interest message from a content requesting device, wherein the first Interest message includes a first name;
creating a first entry in a Pending Interest Table, wherein the first entry corresponds to the first Interest message and is based on the first name;
transmitting the first Interest message to a content producing device;
receiving, from the content producing device, a first notification message which indicates a time period after which a second Interest message is to be sent out by the content requesting device;
transmitting the first notification message to the content requesting device;
removing the first entry from the Pending Interest Table;
receiving a packet that corresponds to the second Interest message, from a content requesting device, wherein the second Interest message includes a second name;
creating a second entry in the Pending Interest Table, wherein the second entry corresponds to the second Interest message and is based on the second name; and
transmitting the second Interest message to the content producing device,
thereby facilitating the content requesting device to handle a potential timeout event.
2. The method of claim 1 , further comprising:
receiving, from the content producing device, a second notification message which indicates a time period after which a third Interest message is to be sent out by the content requesting device;
transmitting the second notification message to the content requesting device;
removing the second entry from the Pending Interest Table;
receiving a packet that corresponds to the third Interest message, from a content requesting device, wherein the third Interest message includes a third name;
creating a third entry in the Pending Interest Table, wherein the third entry corresponds to the third Interest message and is based on the third name; and
transmitting the third Interest message to the content producing device.
3. The method of claim 1 , wherein the second name for the second Interest message is identical to or different from the first name for the first Interest message.
4. The method of claim 1 , wherein the first notification message is a Content Object, thereby facilitating the intermediate router to remove the first entry in the Pending Interest Table corresponding to the first Interest message.
5. The method of claim 1 , wherein the first notification message further indicates that the content producing device is generating the content in response to the first Interest message.
6. The method of claim 1 , wherein the packet that corresponds to the second Interest message is received before the time period expires.
7. The method of claim 1 , further comprising:
receiving a Content Object in response to the second Interest message, wherein the Content Object includes as payload content corresponding to the first Interest message; and
transmitting the Content Object to the content requesting device.
8. The method of claim 2 , further comprising:
receiving a Content Object in response to the third Interest message, wherein the Content Object includes as payload content corresponding to the first Interest message; and
transmitting the Content Object to the content requesting device.
9. A computer system for facilitating forwarding of packets, the system comprising:
a processor; and
a storage device storing instructions that when executed by the processor cause the processor to perform a method, the method comprising:
receiving, by an intermediate router, a packet that corresponds to a first Interest message from a content requesting device, wherein the first Interest message includes a first name;
creating a first entry in a Pending Interest Table, wherein the first entry corresponds to the first Interest message and is based on the first name;
transmitting the first Interest message to a content producing device;
receiving, from the content producing device, a first notification message which indicates a time period after which a second Interest message is to be sent out by the content requesting device;
transmitting the first notification message to the content requesting device;
removing the first entry from the Pending Interest Table;
receiving a packet that corresponds to the second Interest message, from a content requesting device, wherein the second Interest message includes a second name;
creating a second entry in the Pending Interest Table, wherein the second entry corresponds to the second Interest message and is based on the second name; and
transmitting the second Interest message to the content producing device,
thereby facilitating the content requesting device to handle a potential timeout event.
10. The computer system of claim 9 , wherein the method further comprises:
receiving, from the content producing device, a second notification message which indicates a time period after which a third Interest message is to be sent out by the content requesting device;
transmitting the second notification message to the content requesting device;
removing the second entry from the Pending Interest Table;
receiving a packet that corresponds to the third Interest message, from a content requesting device, wherein the third Interest message includes a third name;
creating a third entry in the Pending Interest Table, wherein the third entry corresponds to the third Interest message and is based on the third name; and
transmitting the third Interest message to the content producing device.
11. The computer system of claim 9 , wherein the second name for the second Interest message is identical to or different from the first name for the first Interest message.
12. The computer system of claim 9 , wherein the first notification message is a Content Object, thereby facilitating the intermediate router to remove the first entry in the Pending Interest Table corresponding to the first Interest message.
13. The computer system of claim 9 , wherein the first notification message further indicates that the content producing device is generating the content in response to the first Interest message.
14. The computer system of claim 9 , wherein the packet that corresponds to the second Interest message is received before the time period expires.
15. The computer system of claim 9 , wherein the method further comprises:
receiving a Content Object in response to the second Interest message, wherein the Content Object includes as payload content corresponding to the first Interest message; and
transmitting the Content Object to the content requesting device.
16. The computer system of claim 10 , wherein the method further comprises:
receiving a Content Object in response to the third Interest message, wherein the Content Object includes as payload content corresponding to the first Interest message; and
transmitting the Content Object to the content requesting device.