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Platform Team/Sugar Network/Architecture (view source)

Revision as of 23:42, 26 November 2012

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* Clients create, modify and browse different types of resources ([[Sugar_Network/Concept#Resources|resources]] from conceptual point of view, [[Platform_Team/Sugar_Network/API#Resources|resources]] from the API point of view) on a server;
 
* Clients create, modify and browse different types of resources ([[Sugar_Network/Concept#Resources|resources]] from conceptual point of view, [[Platform_Team/Sugar_Network/API#Resources|resources]] from the API point of view) on a server;
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* If this server is a [[#Distributed_servers|distributed]] one, the system will take care about [[#Synchronisation|synchronizing]] its resources with other distributed servers and, finally, with the central one, the [[#Mothership|Mothership]].
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* If this server is a [[#Node_servers|Node]] server, the system will take care about [[#Synchronization|synchronizing]] its resources with other Node servers and, finally, with the central one, the [[#Master_server|Master]] server.
    
=== Components ===
 
=== Components ===
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Server side is represented by:
 
Server side is represented by:
   −
* [[#Mothersip|Mothership]] server that keeps the whole Sugar Network information, clients might connect directly to this server (on-line case) or indirectly via distributed servers (off-line case);
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* [[#Master_server|Master]] server that keeps the whole Sugar Network information, clients might connect directly to this server (on-line case) or indirectly via Node servers (off-line case);
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* Optional [[#Distributed_servers|distributed servers]], contain a [[#Synchronisation|synchronised]] copy of central server (might be not for the entire Network to save storage space);
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* Optional [[#Node_servers|Node]] servers, contain a [[#Synchronization|synchronised]] copy of central server (might be not for the entire Network to save storage space);
   −
In all cases the server [[Platform_Team/Sugar_Network/API|API]] is the same for clients. But depending on connectivity, clients might be connected to the [[#Mothership|Mothership]] or to an [[#Distributed_servers|intermediate server]].
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In all cases the server [[Platform_Team/Sugar_Network/API|API]] is the same for clients. But depending on connectivity, clients might be connected to the [[#Master_server|Master]] server or to a [[#Node_servers|intermediate server]].
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=== Mothership ===
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=== Master server ===
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The place where data is being collected from all distributed server. If clients have connectivity, they can connect to the Mothership to contribute to the Network directly.
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The place where data is being collected from all Node servers. If clients have connectivity, they can connect to the Master to contribute to the Network directly.
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=== Distributed servers ===
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=== Node servers ===
    
Servers that will be useful if:
 
Servers that will be useful if:
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* connectivity is not cheap and its usage needs to be minimized.
 
* connectivity is not cheap and its usage needs to be minimized.
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Distributed services provide full featured [[Platform_Team/Sugar_Network/API|API]] as the Mothership does. Distributed servers need to be [[#Synchronisation|synchronized]].
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Node servers provide full featured [[Platform_Team/Sugar_Network/API|API]] as the Master does. Nodes need to be [[#Synchronization|synchronized]].
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  −
=== Synchronisation ===
  −
 
  −
To let Network participant, connected to particular [[#Distributed_servers|distributed server]], interact with people from another distributed servers or with people from the Internet, distributed servers need to be synchronized.
  −
 
  −
Server might be synchronised:
  −
 
  −
* With the Mothership, if connectivity presents;
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* With the Mothership or any other distributed servers via the [[Wikipedia:Sneakernet|Sneakernet]].
      
== Conceptual level ==
 
== Conceptual level ==
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The model refers to the following additional information:
 
The model refers to the following additional information:
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  −
==== Sugar Network layers ====
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  −
This is an attempt to generalize the idea of [http://groups.google.com/group/sugar-network/browse_thread/thread/4cad05ec801f364c user/resource levels] with idea that objects should not be removed from the Network immediately (only hidden, and permanently removed by Network administrators). So, every resource is associated with a layer, i.e., it might be visible for observers only if they requested this layer and have permissions to see it.
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For now, implemented only the following list of layers, but it might be reused for [http://groups.google.com/group/sugar-network/msg/f5a1b4d78494a5d3 teachers related workflows] later:
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* {{Code|general}}, the default layer for observers and Network objects; all users can see objects on this layer;
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* {{Code|deleted}}, Network objects' layer will be changed to {{Code|deleted}} after removing objects by users.
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==== Events types ====
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* {{Code|create}}<br>object was created;
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* {{Code|update}}<br>object's properties were modified;
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* {{Code|delete}}<br>object was deleted (hidden);
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* {{Code|vote}}<br>object was voted/unvoted.
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  −
==== Licences ====
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Short license names. The licenses should conform with the [[Activity Library]] licensing [[Activity_Library/Editors/Policy/Licensing|policy]].
      
=== Simplified editing workflow ===
 
=== Simplified editing workflow ===
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Client application is local, for reasons:
 
Client application is local, for reasons:
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* Originally, Sugar Network was being developed for deployments where teachers' XOs will be distributed servers, thus, it will be useful to delegate some of computing to students' XOs;
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* Originally, Sugar Network was being developed for deployments where teachers' XOs will be Node servers, thus, it will be useful to delegate some of computing to students' XOs;
 
* Stimulate doing behaviour when it should be possible to create new client application or tweak existing on a client side;
 
* Stimulate doing behaviour when it should be possible to create new client application or tweak existing on a client side;
 
* It is all time possible to create Web application on a server side.
 
* It is all time possible to create Web application on a server side.
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* Data accessible from removable devices like USB sticks or SD cards.
 
* Data accessible from removable devices like USB sticks or SD cards.
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=== Implementations ===
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== Synchronization ==
 +
 
 +
To let Network participant, connected to particular [[#Node_servers|Node server]], interact with people from another Node servers or with people from the Internet (Master server), Node servers need to be synchronized.
 +
 
 +
Server might be synchronized:
   −
* Sugar Network [[Platform_Team/Sugar_Network/Browser|Browser]].
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* With the Master, if connectivity presents;
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* Client to use for [http://pe.sugarlabs.org/go/Proyecto_Piloto_Hexoquinasa Puno pilot program].
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* With the Master or any other Node servers via the [[Wikipedia:Sneakernet|Sneakernet]].
    
== Getting involved ==
 
== Getting involved ==
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