Changes between Version 17 and Version 18 of Documentation/Tutorial/PingPong

Timestamp:

Jan 22, 2009, 9:46:59 PM (15 years ago)

Author:

huebsch

Comment:

--

Documentation/Tutorial/PingPong

@@ -100 +100 @@
 47      logging_info( "PingPong started up" );
 48
-49      // trigger the creation of the pathload measurement module
-50      //PathloadMeasurement::instance( overlay );
+49      
+50
 51 }
 }}}
@@ -108 +108 @@
 
 The ''startup'' method (lines 20-51) is called from the !StartupWrapper, jolting the operation of the ping pong service. With its call, the !StartupWrapper passes an ''!UnderlayAbstraction'' object to the service, being the main object for communication between the service and ''Ariba'' (lines 20/21).
-When starting up, the service chooses a servcie ID (line 25). Then, it creates a node ID for the SpoVNet node it represents in the instance, under usage of potential base information deposited in the config file (lines 27-29). Same applies to its locator (lines 31-33) and the port (lines 35-37). Then we get to the point where we decide the role of the specific ping pong instance (initiator versus joiner) (lines 39-42). Remember that we got this information in line 17. If the starting node is the initiator of the SpoVNet instance, it creates the SpoVNet, specifying its SpoVNetID, NodeID, Locator and Port (line 40). In contrast, other nodes join the instance, providing the same parameters (line 42).
+When starting up, the service chooses a servcie ID (line 25). Then, it creates a node ID for the SpoVNet node it represents in the instance, under usage of potential base information deposited in the config file (lines 27-29). Same applies to its locator (lines 31-33) and the port (lines 35-37). Then we get to the point where we decide the role of the specific ping pong instance (initiator versus joiner) (lines 39-42). Remember that we got this information in line 17. If the starting node is the initiator of the SpoVNet instance, it creates the SpoVNet, specifying its SpoVNetID, NodeID, Locator and Port (line 40). In contrast, other nodes join the instance, providing the same parameters (line 42). After starting up, a service needs to bind to the SpoVNet Base Overlay with its service ID (lines 44/45). Finally, we may give out all kinds of logging infos by calling the method logging_info (line 47).
+ 
 
-After starting up, a service need to bind to the SpoVNet Base Overlay with its service ID (lines 44/45). 
- 
+{{{
+60 void PingPong::shutdown(){
+61      logging_info( "shutting down PingPong service ..." );
+62
+63      overlay->unbind( this, PingPong::PINGPONG_ID );
+64      Timer::stop();
+65
+66      if( !startping ) abstraction->destroySpoVNet( context );
+67      else             abstraction->leaveSpoVNet( context );
+68
+69      logging_info( "PingPong service shut down" );
+70 }
+}}}
+
+Tu shut a service down after its usage, every service provides a method ''shutdown'' which is automatically called upon finishing (lines 60-70). In here, we unbind the service, stop any timers (mentioned later) and finally leave leave or destroy the SpoVNet instance, depending on the specific node's role. 
 
 
 
+