[#1654] Remove AbstractChannel.doPreClose() and notify close future on register failure. Based on patch of @jpinner

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

@@ -415,6 +415,7 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
                             "Force-closing a channel whose registration task was unaccepted by an event loop: {}",
                             AbstractChannel.this, t);
                     closeForcibly();
+                    closeFuture.setClosed();
                     promise.setFailure(t);
                 }
             }
@@ -440,12 +441,12 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
             } catch (Throwable t) {
                 // Close the channel directly to avoid FD leak.
                 closeForcibly();
+                closeFuture.setClosed();
                 if (!promise.tryFailure(t)) {
                     logger.warn(
                             "Tried to fail the registration promise, but it is complete already. " +
                                     "Swallowing the cause of the registration failure:", t);
                 }
-                closeFuture.setClosed();
             }
         }
 
@@ -750,14 +751,6 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
      */
     protected abstract void doDisconnect() throws Exception;
 
-    /**
-     * Will be called before the actual close operation will be performed. Sub-classes may override this as the default
-     * is to do nothing.
-     */
-    protected void doPreClose() throws Exception {
-        // NOOP by default
-    }
-
     /**
      * Close the {@link Channel}
      */
@@ -834,11 +827,6 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
         }
 
         boolean setClosed() {
-            try {
-                doPreClose();
-            } catch (Exception e) {
-                logger.warn("doPreClose() raised an exception.", e);
-            }
             return super.trySuccess();
         }
     }

transport/src/main/java/io/netty/channel/local/LocalChannel.java

@@ -198,25 +198,19 @@ public class LocalChannel extends AbstractChannel {
         doClose();
     }
 
-    @Override
-    protected void doPreClose() throws Exception {
-        if (state > 2) {
-            // Closed already
-            return;
-        }
-
-        // Update all internal state before the closeFuture is notified.
-        if (localAddress != null) {
-            if (parent() == null) {
-                LocalChannelRegistry.unregister(localAddress);
-            }
-            localAddress = null;
-        }
-        state = 3;
-    }
-
     @Override
     protected void doClose() throws Exception {
+        if (state <= 2) {
+            // Update all internal state before the closeFuture is notified.
+            if (localAddress != null) {
+                if (parent() == null) {
+                    LocalChannelRegistry.unregister(localAddress);
+                }
+                localAddress = null;
+            }
+            state = 3;
+        }
+
         LocalChannel peer = this.peer;
         if (peer != null && peer.isActive()) {
             peer.unsafe().close(unsafe().voidPromise());

transport/src/main/java/io/netty/channel/local/LocalServerChannel.java

@@ -93,22 +93,14 @@ public class LocalServerChannel extends AbstractServerChannel {
         state = 1;
     }
 
-    @Override
-    protected void doPreClose() throws Exception {
-        if (state > 1) {
-            // Closed already.
-            return;
-        }
-
-        // Update all internal state before the closeFuture is notified.
-        LocalChannelRegistry.unregister(localAddress);
-        localAddress = null;
-        state = 2;
-    }
-
     @Override
     protected void doClose() throws Exception {
-        // All internal state was updated already at doPreClose().
+        if (state <= 1) {
+            // Update all internal state before the closeFuture is notified.
+            LocalChannelRegistry.unregister(localAddress);
+            localAddress = null;
+            state = 2;
+        }
     }
 
     @Override