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--- pentominos:pentominos [2009/02/11 10:43] – deva
+++ pentominos:pentominos [2009/04/24 14:08] – deva
@@ Line 1: / Line 1: @@
-=====Pentominos - Data Collection System =====
+======Pentominos - Data Collection System ======
-====Network communication (protocol)====
+=====Overview=====
-All network communication are done via XML documents.\\
+The Pentominos project consists of several sub-projects, that all work together to produce a full circle of data gathering, data storage and data retrieval.\\
-<del>Every XML document is terminated by the zero character ('\0' in c/c++)\\
+Here is a list of the current sub-projects:
-Sending the zero character to a process will reset it, and thereby cleaning up all mess made by illegal documents.</del>\\
+  * [[pentominos:Artefact]] - The data storage server.
-A connection can only be created in client-mode, and will exists as long as the client intends it to.\\
+  * [[pentominos:Feed]] - A thin client data gathering application.
-A server listen will run in a read loop until the client terminates the connection.\\
+  * [[pentominos:Upload Server]] - Journal writer.
-The server must reply to all request with an answer, no matter if the preceding processing went well or not.
+  * [[pentominos:Pidiod]] - The uid => patient ID mapper.
+  * [[pentominos:Pidio]] - The uid => patient ID mapper client (numpad/rfid).
-====The client====
-The client reads its config file, and forks for each config section it encounters.\\
-Every fork handles a single apparatus according to the attached config section.\\
-The main thread runs infinitely and makes sure to terminate all client forks upon termination.\\
-Every client is connected physically to a port on the host computer, and a LUA program runs to determine whether data is ready to be read or not.\\
-The LUA programs hereafter sends this data to the server indirectly through a number of exposed c methods.\\
-Each LUA program must run in an infinite loop, terminating only when the function stop() returns true, and it must not hang waiting on read, but rather have a time-out, and loop again.
-====Data types====
-Problem: An apparatus produces more than one type of data, but stores all measured values in the same data block.
-How to make a query that will hit this multi-data block?\\
-Solutions:
-  * Make client send data one time pr. data type, thus storing it in the db under two different classes.
-    * //Pros//:
-      * We don't need to make any changes to the server code.
-    * //Cons://
-      * The client needs to parse the data (no longer thin).
-      * The data are stored multiple times in the file system.
-  * Make validator detects which types of data are contained in the block, adding a list of type tags in the database.
-    * //Pros://
-      * The data are only stored once in the file system.
-    * //Cons://
-      * Needs to query an entry in a list in the db.
-  * Make the validator insert one entry in the db for each data type, referring to the same data block (file).
-    * //Pros://
-      * The data are only stored once in the file system.
-      * We don't need to make drastic changes to the server code(or client for that matter).
-    * //Cons://
-====Links====
-  * http://xerces.apache.org/xerces-c/
-====TODO====
-  * {{:check.png}} Make SQL comm functions for the LUA programs (e.g. for the cpr server).
-  * {{:check.png}} Rewrite server to utilize read loop.
-  * {{:check.png}} Replace xerces-c with eXpat.
-  * {{:uncheck.png}} Make SQL comm functions for the LUA programs return all results and not just the first one.