Python Manual Manuale Utente

Table of Contents

4

Service Lookup ............................... 44

Service Reports.............................47

Publishing Reports .......................... 48
Monitoring Reports ......................... 48
Lifetime of Reports ......................... 50
Identity of Subscribers .................... 52
Existence of Publishers ................... 54

Service Requests...........................57

Sending a Request ........................... 57
Handling a Response .......................59
Identifying a Response .................... 60
Detecting a Failure .......................... 61
Lack of Response ............................ 63
Servicing a Request ......................... 64
Generating a Failure ........................ 65
Delaying a Response .......................66
Identity of the Sender ...................... 68
Invalid Request Method ..................69
Local Service Requests ................... 69

Message Exchange .......................71

Exchange Initialisation .................... 72
Service Availability......................... 72
Connection Announcements ...........74
Authorisation of Clients ..................75
Distributed Exchange Server...........75
Multiple Exchange Groups.............. 76
Scalability of the Framework .......... 78

Message Encoding........................79

Supported Data Types ..................... 80
Mapping of Scalar Types ................81
User Defined Types......................... 83
Adding New Mappings ................... 83

Handling Structured Types.............. 85

Servlet Framework .......................87

Framework Overview......................87
The HTTP Daemon ......................... 88
The File Server ................................ 89
Client Authorisation ........................90
User Authorisation .......................... 91
HTTP Server Objects ......................91
The Error Servlet .............................92
The Redirect Servlet........................93
The Echo Servlet .............................93
The File Servlet ............................... 93
Logging of Requests........................94

Servlet Objects .............................95

Processing a Request ....................... 95
Persistent Connections .................... 96
Delaying a Response ....................... 97
Destruction of Servlets .................... 98
Processing Content .......................... 99
The Form Servlet........................... 100
Slow HTTP Clients ....................... 101

Servlet Plugins............................105

Python Plugin ................................ 105
Module Caching ............................ 107
Writing a Plugin ............................ 108
Plugin Aliasing .............................. 108

Remote Access ...........................111

The RPC Gateway ......................... 112
The Client Application .................. 113
Restricting Client Access .............. 113
Duplicate Services......................... 114
User Defined Types....................... 115