Add SingleThreadEventLoop.runAllTasks()

- Removed duplicated processTaskQueue() in child event loops
- Simplified the cleanup of cancelled keys in NIO transport

transport/src/main/java/io/netty/channel/SingleThreadEventLoop.java

@@ -168,6 +168,17 @@ public abstract class SingleThreadEventLoop extends AbstractExecutorService impl
         return taskQueue.remove(task);
     }
 
+    protected void runAllTasks() {
+        for (;;) {
+            final Runnable task = pollTask();
+            if (task == null) {
+                break;
+            }
+
+            task.run();
+        }
+    }
+
     protected abstract void run();
 
     protected void cleanup() {

transport/src/main/java/io/netty/channel/socket/nio/AbstractNioChannel.java

@@ -127,8 +127,7 @@ public abstract class AbstractNioChannel extends AbstractChannel {
 
     @Override
     protected void doDeregister() throws Exception {
-        selectionKey().cancel();
-        ((NioChildEventLoop) eventLoop()).cancelledKeys ++;
+        ((NioChildEventLoop) eventLoop()).cancel(selectionKey());
     }
 
     protected abstract boolean doConnect(SocketAddress remoteAddress, SocketAddress localAddress) throws Exception;

transport/src/main/java/io/netty/channel/socket/nio/NioChildEventLoop.java

@@ -57,7 +57,8 @@ final class NioChildEventLoop extends SingleThreadEventLoop {
      */
     protected final AtomicBoolean wakenUp = new AtomicBoolean();
 
-    int cancelledKeys;
+    private int cancelledKeys;
+    private boolean cleanedCancelledKeys;
 
     NioChildEventLoop(ThreadFactory threadFactory, SelectorProvider selectorProvider) {
         super(threadFactory);
@@ -118,7 +119,7 @@ final class NioChildEventLoop extends SingleThreadEventLoop {
                 }
 
                 cancelledKeys = 0;
-                processTaskQueue();
+                runAllTasks();
                 processSelectedKeys();
 
                 if (isShutdown()) {
@@ -150,15 +151,13 @@ final class NioChildEventLoop extends SingleThreadEventLoop {
         }
     }
 
-    private void processTaskQueue() {
-        for (;;) {
-            final Runnable task = pollTask();
-            if (task == null) {
-                break;
-            }
-
-            task.run();
-            cleanUpCancelledKeys();
+    void cancel(SelectionKey key) {
+        key.cancel();
+        cancelledKeys ++;
+        if (cancelledKeys >= CLEANUP_INTERVAL) {
+            cancelledKeys = 0;
+            cleanedCancelledKeys = true;
+            SelectorUtil.cleanupKeys(selector);
         }
     }
 
@@ -168,6 +167,7 @@ final class NioChildEventLoop extends SingleThreadEventLoop {
             return;
         }
         Iterator<SelectionKey> i;
+        cleanedCancelledKeys = false;
         for (i = selectedKeys.iterator(); i.hasNext();) {
             final SelectionKey k = i.next();
             i.remove();
@@ -192,7 +192,7 @@ final class NioChildEventLoop extends SingleThreadEventLoop {
                 unsafe.close(unsafe.voidFuture());
             }
 
-            if (cleanUpCancelledKeys()) {
+            if (cleanedCancelledKeys) {
                 // Create the iterator again to avoid ConcurrentModificationException
                 if (selectedKeys.isEmpty()) {
                     break;
@@ -203,15 +203,6 @@ final class NioChildEventLoop extends SingleThreadEventLoop {
         }
     }
 
-    private boolean cleanUpCancelledKeys() {
-        if (cancelledKeys >= CLEANUP_INTERVAL) {
-            cancelledKeys = 0;
-            SelectorUtil.cleanupKeys(selector);
-            return true;
-        }
-        return false;
-    }
-
     private void closeAll() {
         SelectorUtil.cleanupKeys(selector);
         Set<SelectionKey> keys = selector.keys();

transport/src/main/java/io/netty/channel/socket/oio/OioChildEventLoop.java

@@ -43,12 +43,12 @@ class OioChildEventLoop extends SingleThreadEventLoop {
                     // Waken up by interruptThread()
                 }
             } else {
-                processTaskQueue();
+                runAllTasks();
                 ch.unsafe().read();
 
                 // Handle deregistration
                 if (!ch.isRegistered()) {
-                    processTaskQueue();
+                    runAllTasks();
                     deregister();
                 }
             }
@@ -59,16 +59,6 @@ class OioChildEventLoop extends SingleThreadEventLoop {
         }
     }
 
-    private void processTaskQueue() {
-        for (;;) {
-            Runnable task = pollTask();
-            if (task == null) {
-                break;
-            }
-            task.run();
-        }
-    }
-
     @Override
     protected void wakeup(boolean inEventLoop) {
         interruptThread();