new thread factory for named daemon threads

src/main/java/org/usb4java/javax/Config.java

@@ -7,6 +7,7 @@
 
 import java.util.Properties;
 import java.util.concurrent.*;
+import java.util.concurrent.atomic.AtomicInteger;
 
 /**
  * Configuration.
@@ -41,11 +42,40 @@ final class Config
 
     /** The executor service factory. */
     private ExecutorServiceProvider executorService = new ExecutorServiceProvider() {
+        private final AtomicInteger poolNumber = new AtomicInteger(1);
+
+        class LocalThreadFactory extends Object implements ThreadFactory {
+            private final ThreadGroup group;
+            private final AtomicInteger threadNumber = new AtomicInteger(1);
+            private final String namePrefix;
+
+            LocalThreadFactory() {
+                SecurityManager s = System.getSecurityManager();
+                group = (s != null) ? s.getThreadGroup() :
+                        Thread.currentThread().getThreadGroup();
+                namePrefix = "usb4java-irp-" +
+                        poolNumber.getAndIncrement() +
+                        "-thread-";
+            }
+
+            public Thread newThread(Runnable r) {
+                Thread t = new Thread(group, r,
+                        namePrefix + threadNumber.getAndIncrement(),
+                        0);
+                t.setDaemon(true);
+                if (t.getPriority() != Thread.MAX_PRIORITY)
+                    t.setPriority(Thread.MAX_PRIORITY);
+                return t;
+            }
+        }
+
         public ExecutorService newExecutorService() {
             /* The default executor is a pool of max 1 thread, with 3s timeout. */
-            return (new ThreadPoolExecutor(0, 1,
+            ThreadPoolExecutor es = new ThreadPoolExecutor(0, 1,
                     3L, TimeUnit.SECONDS,
-                    new LinkedBlockingQueue<Runnable>()));
+                    new LinkedBlockingQueue<Runnable>());
+            es.setThreadFactory(new LocalThreadFactory());
+            return es;
         }
     };