Campbell-scientific Java PakBus Software Development Kit Manuel d'utilisateur télécharger pdf (Page 12)

Java PakBus® Software Development Kit

3. Using Transactions

Up to this point, we have built the network and added stations to it. These

steps, by themselves, still do not lead to much functionality except that we can

now create transaction objects and “add” these to the stations. The transactions

will perform most of the work for our application. Let’s extend the above

example to retrieve table definitions and other meta-data from the datalogger:

import com.campbellsci.pakbus.*;

import java.net.*;

class Example3 implements GetTableDefsClient

{

private Network network;

private Socket socket;

private boolean complete;

private Datalogger my_cr1000;

private Datalogger my_other_cr1000;

public void run() throws Exception

{

// create the connection and the network

socket = new Socket("192.168.4.225",6785);

network = new Network(

(short)4079,

socket.getInputStream(),

socket.getOutputStream());

// create the station

my_cr1000 = new Datalogger((short)1085);

my_other_cr1000 = new Datalogger((short)1084,(short)1085);

network.add_station(my_cr1000);

network.add_station(my_other_cr1000);

my_other_cr1000.set_round_trip_time(10000);

// start getting table definitions

my_cr1000.add_transaction(new GetTableDefsTran(this));

// now drive the network

complete = false;

while(!complete)

{

network.check_state();

Thread.sleep(100);

}

public void on_complete(

GetTableDefsTran transaction,

int outcome)

{

if(outcome == GetTableDefsTran.outcome_success)

System.out.println("Got table definitions");

else

System.out.println("Get table defs failed");

}

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Campbell-scientific Java PakBus Software Development Kit Manuel d'utilisateur Page 12

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