Async_Architecture

Async.java

interface Fetcher {
	public void downloadURL(String url, FetcherCallback callbackHandler);
}

interface FetcherCallback {
	public void onData(String data);
	public void onError(Exception e);
}


public class AsyncRequest implements FetcherCallback{
	public void makeRequest(String url) {
		new Fetcher() {
			
			@Override
			public void downloadURL(String url, FetcherCallback callbackHandler) {
				callbackHandler.onData("we got some data.");
				try {
				URL downloadURL = new URL(url);
				URLConnection yc = downloadURL.openConnection();
		        BufferedReader in = new BufferedReader(
		                                new InputStreamReader(
		                                yc.getInputStream()));
		        String inputLine;

		        while ((inputLine = in.readLine()) != null) 
		            callbackHandler.onData(inputLine);
		        in.close();
				} catch (Exception e) {
					callbackHandler.onError(e);
				}
				
			}
		}.downloadURL(url, this);
	}

	@Override
	public void onData(String data) {
		// TODO Auto-generated method stub
		System.out.println(data);
	}

	@Override
	public void onError(Exception e) {
		// TODO Auto-generated method stub
		
	}
}