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<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
<!-- $Id: genericinterface-communication-flow.xml,v 1.1 2012/02/23 13:44:38 mg Exp $ -->
<section id="genericinterface_communication_flow">
<title>Generic Interface Communication Flow</title>
<para>
Generic Interface has a defined flow to perform actions as a provider and as
a requester.
</para>
<para>
This flows are described below:
</para>
<section>
<title>OTRS as Provider</title>
<section>
<title>
Remote Request:
</title>
<orderedlist>
<listitem>
<para>
HTTP request
</para>
<itemizedlist mark="round">
<listitem>
<para>
OTRS receives HTTP request and pass it through the layers.
</para>
</listitem>
<listitem>
<para>
The provider module in in charge to execute and control this actions.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
Network Transport
</para>
<itemizedlist mark="round">
<listitem>
<para>
The network transport module decodes the data payload and separates the
operation name from the rest of the data.
</para>
</listitem>
<listitem>
<para>
The operation name and the operation data are returned to the provider.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
<remark>Data External</remark>
</para>
<itemizedlist mark="round">
<listitem>
<para>
Data as sent from the remote system (This is not a module-based layer).
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
Mapping
</para>
<itemizedlist mark="round">
<listitem>
<para>
The data is transformed from the External System format to the OTRS internal
format as specified in the mapping configuration for this operation (Mapping
for incoming request data).
</para>
</listitem>
<listitem>
<para>
The already transformed data is returned to the provider.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
<remark>Data Internal</remark>
</para>
<itemizedlist mark="round">
<listitem>
<para>
Data as transformed and prepared to be passed to the operation (This is not
a module based layer).
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
Operation
</para>
<itemizedlist mark="round">
<listitem>
<para>
Receives and validates data.
</para>
</listitem>
<listitem>
<para>
Performs user access control.
</para>
</listitem>
<listitem>
<para>
Executes the action.
</para>
</listitem>
</itemizedlist>
</listitem>
</orderedlist>
</section>
<section>
<title>
OTRS Response:
</title>
<orderedlist>
<listitem>
<para>
Operation
</para>
<itemizedlist>
<listitem>
<para>
Returns result data to the provider.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
<remark>Data Internal</remark>
</para>
<itemizedlist>
<listitem>
<para>
Data as returned from operation.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
Mapping
</para>
<itemizedlist>
<listitem>
<para>
The data is transformed back to the Remote system format as specified in the
mapping configuration (Mapping for outgoing response data).
</para>
</listitem>
<listitem>
<para>
The already transformed data is returned to the provider.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
<remark>Data external</remark>
</para>
<itemizedlist>
<listitem>
<para>
Data as transformed and prepared to be passed to Network Transport as
response.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
Network Transport
</para>
<itemizedlist>
<listitem>
<para>
Receives the data already in the Remote System format.
</para>
</listitem>
<listitem>
<para>
Constructs a valid response for this network transport type.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
HTTP response
</para>
<itemizedlist>
<listitem>
<para>
The response is sent back to the web service client.
</para>
</listitem>
<listitem>
<para>
In the case of an error, an error response is sent to the remote system
(e.g. SOAP fault, HTTP error, etc).
</para>
</listitem>
</itemizedlist>
</listitem>
</orderedlist>
</section>
</section>
<section>
<title>OTRS as Requester</title>
<section>
<title>OTRS Request:</title>
<orderedlist>
<listitem>
<para>
Event Trigger Handler
</para>
<itemizedlist mark="round">
<listitem>
<para>
Based on the web service configuration determines if the request will be
synchronous or asynchronous.
</para>
<itemizedlist mark="round">
<listitem>
<para>
Synchronous
</para>
<itemizedlist mark="round">
<listitem>
<para>
A direct call to the Requester is made in order to create a new request and
pass it through the layers.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
Asynchronous
</para>
<itemizedlist mark="round">
<listitem>
<para>
Create a new Generic Interface (Requester) task for the OTRS Scheduler (by
delegating the request execution to the Scheduler, the user experience could
be highly improved, otherwise all time needed to prepare the request and the
remote execution will be added to the OTRS Events that trigger those
requests).
</para>
</listitem>
<listitem>
<para>
In its next cycle the Scheduler process reads the new task and creates a
call to the Requester that will create a new request and pass it through the
layers.
</para>
</listitem>
</itemizedlist>
</listitem>
</itemizedlist>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
Invoker
</para>
<itemizedlist mark="round">
<listitem>
<para>
Receives data from the event.
</para>
</listitem>
<listitem>
<para>
Validates received data (if needed).
</para>
</listitem>
<listitem>
<para>
Call core modules to complement the data (if needed).
</para>
</listitem>
<listitem>
<para>
Return the request data structure or send a Stop Communication signal to the
requester, to gracefully cancel the request.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
<remark>Data Internal</remark>
</para>
<itemizedlist mark="round">
<listitem>
<para>
Data as passed from the invoker (This is not a module based layer).
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
Mapping
</para>
<itemizedlist mark="round">
<listitem>
<para>
The data is transformed to the Remote system format as specified in the
mapping configuration (Mapping for outgoing response data).
</para>
</listitem>
<listitem>
<para>
The already transformed data is returned to the requester.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
<remark>Data External</remark>
</para>
<itemizedlist mark="round">
<listitem>
<para>
Data as transformed and prepared for sending to the remote system.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
Network Transport
</para>
<itemizedlist mark="round">
<listitem>
<para>
Receives the remote operation name and the data already transformed to the
Remote System format from the requester.
</para>
</listitem>
<listitem>
<para>
Constructs a valid request for the network transport.
</para>
</listitem>
<listitem>
<para>
Sends the request to the remote system and waits for the response
</para>
</listitem>
</itemizedlist>
</listitem>
</orderedlist>
</section>
<section>
<title>Remote Response:</title>
<orderedlist>
<listitem>
<para>
Network transport
</para>
<itemizedlist mark="round">
<listitem>
<para>
Receives the response and decodes the data payload.
</para>
</listitem>
<listitem>
<para>
Returns the data to the requester.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
<remark>Data External</remark>
</para>
<itemizedlist mark="round">
<listitem>
<para>
Data as received from the Remote System
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
Mapping
</para>
<itemizedlist mark="round">
<listitem>
<para>
The data is transformed form the External System format to the OTRS internal
format as specified in the mapping configuration for this operation (Mapping
for incoming response data).
</para>
</listitem>
<listitem>
<para>
The already transformed data is returned to the requester.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
<remark>Data Internal</remark>
</para>
<itemizedlist mark="round">
<listitem>
<para>
Data as transformed and ready to be passed back to the requester.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
Invoker
</para>
<itemizedlist mark="round">
<listitem>
<para>
Receives return data.
</para>
</listitem>
<listitem>
<para>
Handles the data as needed by specifically by each Invoker (included error
handling if any).
</para>
</listitem>
<listitem>
<para>
Return the Invoker result and data to the Requester.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>
Event Handler or Scheduler
</para>
<itemizedlist mark="round">
<listitem>
<para>
Receives the data from the Requester, in the case of the Scheduler this data
might contain information to Re-Schedule the task immediately or in the
future.
</para>
</listitem>
</itemizedlist>
</listitem>
</orderedlist>
</section>
</section>
</section>
|
