Caching infrastructure

Abstract

Example systems and methods are directed at maintaining and retrieving presence metadata. One example method includes receiving a request from a first client to edit a document file, and sending short-term check out metadata to the first client to begin an editing session. The method also includes writing the transition ID to a transition table stored in a cache, wherein the presence of another transition ID in the cache indicates that a document has switched from a single-client mode to a multi-client mode. An example system includes a processing unit operative to receive a document, the document including short-term check out metadata indicating an editing session has begun, ping a cache to determine if another transition ID is stored in the cache, and send a transition ID to a transition table stored in a cache to switch from a single-client mode to a multi-client mode.

1 - 20 . (canceled) 
     
     
         21 . A method for updating presence information for a document, the method comprising:
 receiving, at a first client, short term check out metadata by opening the document, the short term check out metadata comprising presence metadata;   adding a transition ID for the first client to the short term check out metadata;   sending the transition ID to a transition table stored in a cache;   determining that presence information in the cache has not been updated by a second client in a configurable window of time; and   upon determining that the presence information has not been updated, deleting the presence information of the second client.   
     
     
         22 . The method of  claim 21 , wherein adding the transition ID for the first client switches the document to a multi client editing mode. 
     
     
         23 . The method of  claim 21 , wherein deleting the presence information of the second client indicates that the document is in a single client editing mode. 
     
     
         24 . The method of  claim 21 , further comprising:
 deleting the transition ID from the transition table.   
     
     
         25 . The method of  claim 21 , further comprising:
 pinging the server to determine whether a new transition ID has been added to the transition table.   
     
     
         26 . The method of  claim 25 , further comprising
 receiving a ping from the server indicating that the document is still in the single client editing mode.   
     
     
         27 . The method of  claim 25 , further comprising
 receiving a ping from the server indicating that the document has switched to the multi client editing mode.   
     
     
         28 . One or more computer storage media not consisting of a propagated data signal and having computer-executable instructions that, when executed, provide a method for updating presence information for a document, the method comprising:
 receiving, at a first client, short term check out metadata by opening the document, the short term check out metadata comprising presence metadata;   adding a transition ID for the first client to the short term check out metadata;   sending the transition ID to a transition table stored in a cache;   determining that presence information in the cache has not been updated by a second client in a configurable window of time; and   upon determining that the presence information has not been updated, deleting the presence information of the second client.   
     
     
         29 . The one or more computer storage media of  claim 28 , wherein adding the transition ID for the first client switches the document to a multi client editing mode. 
     
     
         30 . The one or more computer storage media of  claim 28 , wherein deleting the presence information of the second client indicates that the document is in a single client editing mode. 
     
     
         31 . The one or more computer storage media of  claim 28 , further comprising:
 deleting the transition ID from the transition table.   
     
     
         32 . The one or more computer storage media of  claim 28 , further comprising:
 pinging the server to determine whether a new transition ID has been added to the transition table.   
     
     
         33 . The one or more computer storage media of  claim 32 , further comprising
 receiving a ping from the server indicating that the document is still in the single client editing mode.   
     
     
         34 . The one or more computer storage media of  claim 32 , further comprising
 receiving a ping from the server indicating that the document has switched to the multi client editing mode.   
     
     
         35 . A computer system comprising:
 a processor; and   a memory communicatively coupled to the processor, the memory having computer-executable instructions that when executed by the processor, provide a method for updating presence information for a document, the method comprising:
 receiving, at a first client, short term check out metadata by opening the document, the short term check out metadata comprising presence metadata; 
 adding a transition ID for the first client to the short term check out metadata; 
 sending the transition ID to a transition table stored in a cache; 
 determining that presence information in the cache has not been updated by a second client in a configurable window of time; and 
 upon determining that the presence information has not been updated, deleting the presence information of the second client. 
   
     
     
         36 . The computer system of  claim 35 , wherein adding the transition ID for the first client switches the document to a multi client editing mode. 
     
     
         37 . The computer system of  claim 35 , wherein deleting the presence information of the second client indicates that the document is in a single client editing mode. 
     
     
         38 . The computer system of  claim 35 , further comprising:
 deleting the transition ID from the transition table.   
     
     
         39 . The computer system of  claim 35 , further comprising:
 pinging the server to determine whether a new transition ID has been added to the transition table.   
     
     
         40 . The computer system of  claim 39 , further comprising
 receiving a ping from the server indicating that the document has switched to the multi client editing mode.