Use daemon threads in executor service (#171)

src/main/java/com/apptasticsoftware/rssreader/AbstractRssReader.java

@@ -24,6 +24,7 @@
 package com.apptasticsoftware.rssreader;
 
 import com.apptasticsoftware.rssreader.util.Mapper;
+import com.apptasticsoftware.rssreader.util.DaemonThreadFactory;
 
 import javax.net.ssl.SSLContext;
 import javax.xml.stream.XMLInputFactory;
@@ -64,7 +65,7 @@
  */
 public abstract class AbstractRssReader<C extends Channel, I extends Item> {
     private static final String LOG_GROUP = "com.apptasticsoftware.rssreader";
-    private static final ScheduledThreadPoolExecutor EXECUTOR = new ScheduledThreadPoolExecutor(1);
+    private static final ScheduledExecutorService EXECUTOR = new ScheduledThreadPoolExecutor(1, new DaemonThreadFactory("RssReaderWorker"));
     private final HttpClient httpClient;
     private DateTimeParser dateTimeParser = new DateTime();
     private String userAgent = "";

src/main/java/com/apptasticsoftware/rssreader/util/DaemonThreadFactory.java

@@ -0,0 +1,23 @@
+package com.apptasticsoftware.rssreader.util;
+
+import java.util.concurrent.ThreadFactory;
+
+/**
+ * Thread factory that creates daemon threads
+ */
+public class DaemonThreadFactory implements ThreadFactory {
+    private final String name;
+    private int counter;
+
+    public DaemonThreadFactory(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public Thread newThread(Runnable r) {
+        Thread t = new Thread(r, name + "-" + counter++);
+        t.setDaemon(true);
+        return t;
+    }
+
+}