Update

Rewritten-docs.md

@@ -38,19 +38,20 @@ Analysis
 
 ### Current solution at MFF UK
 
-The ideas presented above are not completely new. There was a group of students, 
-who already implemented an evaluation solution for student's homeworks in 2006. 
-Its name is [CodEx - The Code Examiner](http://codex.ms.mff.cuni.cz/project/) 
-and it has been used with some improvements since then. The original plan was to 
-use the system only for basic programming courses, but there is demand for 
-adapting it for many different subjects.
+The ideas presented above are not completely new. There was a group of
+students, who already implemented an evaluation solution for student's
+homeworks in 2006.  Its name is [CodEx - The Code
+Examiner](http://codex.ms.mff.cuni.cz/project/) and it has been used with some
+improvements since then. The original plan was to use the system only for basic
+programming courses, but there is demand for adapting it for many different
+subjects.
 
 CodEx is based on dynamic analysis. It features a web-based interface, where
 supervisors assign exercises to their students and the students have a time
 window to submit the solution. Each solution is compiled and run in sandbox
-(MO-Eval). The metrics which are checked are: corectness of the output, time and 
-memory limits. It supports programs written in C, C++, C#, Java, Pascal, Python 
-and Haskell.
+(MO-Eval). The metrics which are checked are: corectness of the output, time
+and memory limits. It supports programs written in C, C++, C#, Java, Pascal,
+Python and Haskell.
 
 Current system is old, but robust. There were no major security incidents
 during its production usage. However, from today's perspective there are
@@ -78,7 +79,8 @@ several drawbacks. The main ones are:
   which have a more difficult evaluation chain than simple
   compilation/execution/evaluation provided by CodEx.
 
-Supervisors and current users of CodEx gives us following ideas for improvements:
+Supervisors and current users of CodEx gives us following ideas for
+improvements:
 
 - keep it simple
 - localization (both UI and exercises)
@@ -421,8 +423,12 @@ deserves some.
 
 *A runtime environment* defines the used programming language or tools
 which are needed to process and evaluate a solution. Examples of a
-runtime environment can be “*Linux + GCC*”, “*Linux + Mono*”, “*Windows
-+ .NET 4*”, “*Bison + Yacc.”*
+runtime environment can be:
+
+- *Linux + GCC*
+- *Linux + Mono*
+- *Windows + .NET 4*
+- *Bison + Yacc*
 
 ### Limits
 
@@ -562,14 +568,10 @@ of entities and relational database models), describe the logical
 grouping of entities and how they are related:
 
 -   user + settings + logins + ACL
-
 -   instance + licences + groups + group membership
-
 -   exercise + assignments + localized assignments + runtime
     environments + hardware groups
-
 -   submission + solution + reference solution + solution evaluation
-
 -   comment threads + comments
 
 ### API endpoints
@@ -607,15 +609,34 @@ can accept it or decline it
 Job processing progress monitoring
 ----------------------------------
 
-@todo: How does the Backend push the progress of evaluation through the
-Monitor to the Frontend
+When evaluating a job the worker sends progress messages on predefined points of
+evaluation chain. The sending place can be on very beginning of the job, when
+submit archive is downloaded or at the end of each simple task with its state
+(completed, failed, skipped). These messages are sent to broker through existing
+ZeroMQ connection. Detailed format of messages can be found on [communication
+page](https://github.com/ReCodEx/wiki/wiki/Overall-architecture#commands-from-worker-to-broker).
+
+Broker only resends received progress messages to the monitor component via
+ZeroMQ socket. The output message format is the same as the input format.
+
+Monitor parses received messages to JSON format, which is easy to work with in
+JavaScript inside web application. All messages are cached (one queue per job)
+and can be obtained multiple times through WebSocket communication channel. The
+cache is cleared 5 minutes after receiving last message.
 
 Publishing of the results
 -------------------------
 
-@todo: How does the Backend publish the results and how it notifies the
-Frontend; How the Frontend can request the results if the notification
-does not arrive
+After job finish the worker packs results directory into single archive and
+uploads it to the fileserver through HTTP protocol. The target URL is obtained
+from API in headers on job initiation. Then "job done" notification request is
+performed to API via broker. Special submissions (reference or asynchronous
+submissions) are loaded immediately, other types are loaded on-demand on first
+results request.
+
+Loading results means fetching archive from fileserver, parsing the main YAML
+file generated by worker and saving data to the database. Also, points are
+assigned by score calculator.
 
 User documentation
 ==================
@@ -635,6 +656,7 @@ Supervisor, Admin
 @todo: Describe the requirements of running the web application (modern
 web browser, enabled CSS, JavaScript, Cookies & Local storage)
 
+
 ### Scenario \#1: Becoming a user of ReCodEx
 
 #### How to create a user account?
@@ -678,8 +700,7 @@ in the top section of the left sidebar right under your name. You will
 have to expand the sidebar with a button next to the “*ReCodEx*” title
 (shown in the picture below).
 
-![](media/image1.png){width="3.3131944444444446in"
-height="0.6173611111111111in"}
+@todo: Simon's image
 
 #### What to do when you cannot remember your password?
 
@@ -705,15 +726,14 @@ website.
 There are several options you have to edit your user account.
 
 -   changing your personal information (i.e., name)
-
 -   changing your credentials (email and password)
-
 -   updating your preferences (e.g., source code viewer/editor settings,
     default language)
 
 You can access the settings page through the “*Settings*” button right
 under your name in the left sidebar.
 
+
 ### Scenario \#2: User is a student
 
 @todo: describe what it means to be a “student” and what are the
@@ -749,6 +769,7 @@ although the results say different
 who else can see the comments, how notifications work (*not implemented
 yet*!).
 
+
 ### Scenario \#3: User is supervisor of a group
 
 @todo: describe what it means to be a “supervisor” of a group and what
@@ -804,7 +825,7 @@ the awarded points will be overridden.
 #### How can I discuss student’s solution with him/her directly through the web application?
 
 @todo: Describe the comments thread behavior (public/private comments),
-who else can see the comments
+who else can see the comments -- same as from the student perspective
 
 
 ### Writing job configuration
@@ -825,7 +846,8 @@ use the full expressive power of the system.
 
 This section walks through creation of job configuration for _hello world_
 exercise. The goal is to compile file _source.c_ and check if it prints `Hello
-World!` to the standard output.
+World!` to the standard output. This is the only test case, let's call it
+**A**.
 
 The problem can be split into several tasks: