Introducing Spring Framework

Chapter 13 ■ Adding E-mail and Scheduling Tasks
Listing 13-10. DocumentScheduler.java
package com.apress.isf.spring.scheduler;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import com.apress.isf.java.model.Document;
import com.apress.isf.java.model.Type;
import com.apress.isf.java.service.DocumentService;
@Component
public class DocumentScheduler {
private static Logger log = LoggerFactory.getLogger(DocumentScheduler.class);
private static int HTTP_NOT_FOUND_CODE = 404;
private static int HTTP_OK_CODE = 200;
}
@Autowired
DocumentService documentService;
private Type webType = new Type("WEB",".url");
@Scheduled(cron="*/10 * * * * ?")
public void urlCheck() throws IOException{
log.debug("@@ Checking valid WEB type Document's URL...");
URL url = null;
HttpURLConnection connection = null;
int responseCode = 0;
List documents = documentService.findByType(webType);
for(Document document : documents){
url = new URL(document.getLocation());
connection = (HttpURLConnection)url.openConnection();
connection.setRequestMethod("GET");
connection.connect();
responseCode = connection.getResponseCode();
log.debug("Name lookup: " + document.getName());
log.debug("Code: " + Integer.toString(responseCode));
if(HTTP_OK_CODE == responseCode)
log.info("URL is still valid!!");
else
log.error("URL INVALID! Code: " + HTTP_NOT_FOUND_CODE + ". Please let
the Administrator know");
}
}
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