remove AbstractChannel#doPreClose

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();
             }
         }
 
@@ -514,13 +515,18 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
                 return;
             }
 
+            if (closeFuture.isSuccess()) {
+                // Closed already.
+                promise.setSuccess();
+            }
+
             boolean wasActive = isActive();
-            if (closeFuture.setClosed()) {
             ChannelOutboundBuffer outboundBuffer = this.outboundBuffer;
             this.outboundBuffer = null; // Disallow adding any messages and flushes to outboundBuffer.
 
             try {
                 doClose();
+                closeFuture.setClosed();
                 promise.setSuccess();
             } catch (Throwable t) {
                 promise.setFailure(t);
@@ -543,10 +549,6 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
 
                 deregister(voidPromise());
             }
-            } else {
-                // Closed already.
-                promise.setSuccess();
-            }
         }
 
         @Override
@@ -750,14 +752,6 @@ 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 +828,6 @@ 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

@@ -199,13 +199,12 @@ public class LocalChannel extends AbstractChannel {
     }
 
     @Override
-    protected void doPreClose() throws Exception {
+    protected void doClose() 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);
@@ -213,10 +212,7 @@ public class LocalChannel extends AbstractChannel {
             localAddress = null;
         }
         state = 3;
-    }
 
-    @Override
-    protected void doClose() throws Exception {
         LocalChannel peer = this.peer;
         if (peer != null && peer.isActive()) {
             peer.unsafe().close(unsafe().voidPromise());

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

@@ -94,23 +94,17 @@ public class LocalServerChannel extends AbstractServerChannel {
     }
 
     @Override
-    protected void doPreClose() throws Exception {
+    protected void doClose() 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().
-    }
-
     @Override
     protected Runnable doDeregister() throws Exception {
         ((SingleThreadEventExecutor) eventLoop()).removeShutdownHook(shutdownHook);