demoapp.java

用于传感器网络的节点操作系统 TinyOS 结构设计非常有意思

package net.tinyos.tinydb;
import net.tinyos.tinydb.parser.*;
import java.util.Vector;
import java.io.*;

/** 
    Simple standalone demo application to run a 
    query and print out the results.  
*/

public class DemoApp implements ResultListener{
    public DemoApp() {
	try {
	    //initialize
	    TinyDBMain.initMain();
	
	    //parse the query
	    q = SensorQueryer.translateQuery("select light", (byte)1);
	    
	    //inject the query, registering ourselves as a listener for result
	    System.out.println("Sending query.");
	    TinyDBMain.injectQuery( q, this);

	} catch (IOException e) {
	    System.out.println("Network error.");
	} catch (ParseException e) {
	    System.out.println("Invalid Query.");
	}


    }
    
    /* ResultListenr method called whenever a result arrives */
    public void addResult(QueryResult qr) {
	Vector v = qr.resultVector();

	//print the result
	for (int i = 0; i < v.size(); i++) {
	    System.out.print("\t" + v.elementAt(i) + "\t|");
	}
	System.out.println();

    }

    public static void main(String argv[]) {
	new DemoApp();
    }
    
    TinyDBQuery q;
}