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Scrapper.java
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Scrapper.java
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package scraping;
import java.io.IOException;
import scraping.Errors.BadDataException;
import scraping.Errors.NoDateException;
import scraping.Errors.NoNameException;
abstract public class Scrapper extends Thread {
private static int ID = 0;
private int id = ++ID;
private LinkQueue links;
private ResultQueue results;
private boolean running = false;
public Scrapper(LinkQueue links, ResultQueue results) {
this.links = links;
this.results = results;
}
public abstract Result scrapeData(String url) throws IOException, NoNameException, NoDateException, BadDataException;
public void run() {
try {
while(!interrupted()) {
while(!running) synchronized(this) { wait(); }
String link = links.get();
if("quit".equals(link)) {
links.put("quit");
break;
}
try {
Result result = scrapeData(link);
results.put(link, result);
} catch(IOException e) {}
catch (NoNameException e) {}
catch (NoDateException e) {}
catch (BadDataException e) {}
}
} catch(InterruptedException e) {}
}
public synchronized void work() { running = true; notify(); }
public synchronized void pause() { running = false; }
public synchronized void halt() { interrupt(); }
}