Methods, apparatus and systems for resuming transmission link

A system for resuming a transmission link, comprising:

• a first server, a second server, and a third server between the first server and the second server, wherein the first server, the second server, and the third server are any three consecutive servers in a transmission link in an application delivery network between a client and a source station server, and the first server, the second server and the third server are nodes of the application delivery network;
• the first server is configured to receive a breakpoint-resuming-request-sent-by-the-second-server if the first server is disconnected from the third server, the breakpoint-resuming-request-sent-by-the-second-server including status information of a transfer cache of the second server and an ingress port of the second server;
• the first server is configured to send a breakpoint-resuming-response-to-the-second-server on condition that the first server determines that a resuming condition is satisfied according to the status information of a transfer cache of the first server and the status information of the transfer cache of the second server, the breakpoint-resuming-response-to-the-second-server including the status information of the transfer cache of the first server and an egress port of the first server;
• the second server is configured to send a resumable response message to the first server on condition that the second server determines that the resuming condition is satisfied according to the status information of the transfer cache of the second server and the status information of the transfer cache of the first server;
• wherein the first server determining that the resuming condition is satisfied on condition that the receiving-interrupt-position-of-the-request-cache-of-the-second-server is within the range of the available-starting-position-of-the-request-cache-of-the-first-server;
• the first server is configured to establish, in response to the resumable response message, a compensation connection with the second server from the egress port of the first server to the ingress port of the second server, wherein the compensation connection compensates and resumes an abnormal connection in the transmission link;
• and
• the first server and the second server are configured to perform resumption through the compensation connection.

An apparatus for resuming a transmission link, applied to a first server, wherein the first server, a second server, and a third server are any three consecutive servers in a transmission link in an application delivery network between a client and a source station server, and the first server, the second server and the third server are nodes of the application delivery network, the third server is between the first server and the second server, the apparatus comprising:

• a receiving module, configured to receive, if the first server is disconnected from a third server in a transmission link, a breakpoint-resuming-request-sent-by-the-second-server, the breakpoint-resuming-request-sent-by-the-second-server including status information of a transfer cache of the second server and port information of the second server, the third server being a server between the first server and the second server;
• a sending module, configured to send, on condition that a resuming condition is determined to be satisfied according to the status information of a transfer cache of the first server and the status information of the transfer cache of the second server, a breakpoint-resuming-response-to-the-second-server, the breakpoint-resuming-response-to-the-second-server including the status information of the transfer cache of the first server and port information of the first server;
• wherein the receiving module is further configured to receive a resumable response message from the second server, the response message being sent on condition that the second server determines that the resuming condition is satisfied according to the status information of the transfer cache of the second server and the status information of the transfer cache of the first server;
• wherein the first server determining that the resuming condition is satisfied on condition that the receiving-interrupt-position-of-the-request-cache-of-the-second-server server;
• a connection establishment module, configured to establish a compensation connection between the first server and the second server, wherein the compensation connection compensates and resumes an abnormal connection in the transmission link;
• and
• a resuming module, configured to perform resumption with the second server through the compensation connection.