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EventBusExample.c
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EventBusExample.c
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// EventBus.c
//
// Author: Justin Marple with Team BNS
// Contact: jmarple@umass.edu
// Date: 05/31/2015
//
// This example file shows how to use
// the EventBus interface in BNSLib
// Note: The Task EventPrinter() recieves
// messages, but doesn't know (and doesn't
// care) where those messages come from
// This is why using an event bus creates
// code that is loosely coupled.
//
// Dependencies:
// BNSLib.h in previous directory
//
// ------------------------------------------------------------------------
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// The author can be contacted by email at jmarple@umass.edu
//
// ------------------------------------------------------------------------
#include "..\BNSLib.h"
task EventPrinter()
{
// Subscribe to the event bus
// Message ID = 0x01/0x02
// Messgae type = char/string
// Max number of messages to save = 50
int userID1 = EventBusSubscribe(0x01, char, 50);
int userID2 = EventBusSubscribe(0x02, string, 50);
int userID3 = EventBusSubscribe(0x02, string, 50);
while(1==1)
{
// Check for messages on userID1
char* pChar = EventBusGetMessage(userID1);
if(pChar != 0)
writeDebugStreamLine("Message from User 1: %d", *pChar);
// Check for messages on userID2
string* pString1 = (string*)EventBusGetMessage(userID2);
if(pString1 != 0)
writeDebugStreamLine("Message from User 2: %s", *pString1);
// Check for messages on userID3
string* pString2 = (string*)EventBusGetMessage(userID3);
if(pString2 != 0)
writeDebugStreamLine("Message from User 3: %s", *pString2);
delay(100);
}
}
task main()
{
// Initialize BNSLib and turn on the event bus
BNS();
BNSEventBus();
// Start the task that prints messages out to the debug stream
startTask(EventPrinter);
// Allow the task to subscribe to the event bus
// and then send some messages
delay(100);
char alpha = 42;
string helloWorld = "Hello World";
string foofoofoo = "foo foo foo!";
EventBusPublish(0x01, &alpha);
EventBusPublish(0x02, &helloWorld);
EventBusPublish(0x02, &foofoofoo);
}