[grizzly~git:395059a7] [2.3.x] Incremental changes for https://java.net/jira/browse/GRIZZLY-1546

  • From: rlubke@...
  • To: commits@...
  • Subject: [grizzly~git:395059a7] [2.3.x] Incremental changes for https://java.net/jira/browse/GRIZZLY-1546
  • Date: Thu, 18 Jul 2013 22:58:27 +0000

Project:    grizzly
Repository: git
Revision:   395059a7b4509f5aff84de289fa5ce3cfafc13c4
Author:     rlubke
Date:       2013-07-18 22:58:02 UTC
Link:       

Log Message:
------------
[2.3.x] Incremental changes for https://java.net/jira/browse/GRIZZLY-1546 ;
(Ref GRIZZLY-1345. Generalize the graceful shutdown to be a feature of the 
core transport vs specific to http-server).
 - Refactoring based on discussions with Alexey.



Revisions:
----------
395059a7b4509f5aff84de289fa5ce3cfafc13c4


Modified Paths:
---------------
modules/grizzly/src/main/java/org/glassfish/grizzly/ShutdownContext.java
modules/grizzly/src/main/java/org/glassfish/grizzly/ShutdownListener.java
modules/grizzly/src/main/java/org/glassfish/grizzly/Transport.java
modules/grizzly/src/main/java/org/glassfish/grizzly/nio/NIOTransport.java
modules/grizzly/src/test/java/org/glassfish/grizzly/NIOTransportTest.java


Diffs:
------
--- a/modules/grizzly/src/main/java/org/glassfish/grizzly/ShutdownContext.java
+++ b/modules/grizzly/src/main/java/org/glassfish/grizzly/ShutdownContext.java
@@ -40,8 +40,10 @@
 package org.glassfish.grizzly;
 
 /**
+ * This class will be passed to {@link ShutdownListener} instances
+ * registered against a {@link Transport}.
  *
- * @since 2.3.5
+ * @since 2.3.4
  */
 public interface ShutdownContext {
 --- 
a/modules/grizzly/src/main/java/org/glassfish/grizzly/ShutdownListener.java
+++ 
b/modules/grizzly/src/main/java/org/glassfish/grizzly/ShutdownListener.java
@@ -83,10 +83,20 @@ package org.glassfish.grizzly;/*
  * Interface to notify interested parties that a {@link Transport} is being
  * shutdown.
  *
- * @since 2.3.5
+ * Keep in mind that there is no guarantee that all listeners will be invoked
+ * before the transport is terminated (e.g., timed graceful shutdown or a 
graceful
+ * shutdown() that was initiated and then shutdownNow() is later invoked.
+ *
+ * @since 2.3.4.
  */
 public interface ShutdownListener {
 
+    /**
+     * Invoked when an attempt is made to shutdown the transport gracefully.
+     *
+     * @param shutdownContext the {@link ShutdownContext} for this shutdown
+     *                        request.
+     */
     void shutdownRequested(final ShutdownContext shutdownContext);
 
 }--- a/modules/grizzly/src/main/java/org/glassfish/grizzly/Transport.java
+++ b/modules/grizzly/src/main/java/org/glassfish/grizzly/Transport.java
@@ -423,11 +423,12 @@ public interface Transport extends 
MonitoringAware<TransportProbe> {
      * Gracefully stops the transport accepting new connections and allows
      * existing work to complete before finalizing the shutdown.  This method
      * will wait indefinitely for all interested parties to signal it is safe
-     * to terminate the transport.
+     * to terminate the transport.   Invoke {@link #shutdownNow()} to 
terminate
+     * the transport if the graceful shutdown is taking too long.
      *
      * @return a {@link GrizzlyFuture} which will return the stopped 
transport.
      *
-     * @since 2.3.5
+     * @since 2.3.4
      *
      * @see ShutdownListener
      */
@@ -441,10 +442,14 @@ public interface Transport extends 
MonitoringAware<TransportProbe> {
      * transport will be terminated forcefully.
      *
      * @param gracePeriod the grace period for a graceful shutdown before the
-     *                    transport is forcibly terminated.  A grace period
-     *                    of zero or less effectively means no timeout.
+     *                    transport is forcibly terminated.  If gracePeriod
+     *                    is zero or less, then there is no time limit for
+     *                    the shutdown.
      * @param timeUnit the {@link TimeUnit} of the specified grace period.
-     * @return
+     *
+     * @return a {@link GrizzlyFuture} which will return the stopped 
transport.
+     *
+     * @since 2.3.4
      */
     GrizzlyFuture<Transport> shutdown(final long gracePeriod,
                                       final TimeUnit timeUnit);
@@ -454,7 +459,7 @@ public interface Transport extends 
MonitoringAware<TransportProbe> {
      *
      * @throws IOException
      *
-     * @since 2.3.5
+     * @since 2.3.4
      */
     void shutdownNow() throws IOException;
 
@@ -467,9 +472,11 @@ public interface Transport extends 
MonitoringAware<TransportProbe> {
      * @param shutdownListener the {@link ShutdownListener}
      *
      * @return <code>true</code> if the listener was successfully registered,
-     *  otherwise <code>false</code>.
+     *  otherwise <code>false</code>.  When this method returns 
<code>false</code>
+     *  it means one of two things: the transport is stopping or is stopped, 
or
+     *  the listener has already been registered.
      *
-     * @since 2.3.5
+     * @since 2.3.4
      */
     boolean addShutdownListener(final ShutdownListener shutdownListener);
     --- 
a/modules/grizzly/src/main/java/org/glassfish/grizzly/nio/NIOTransport.java
+++ 
b/modules/grizzly/src/main/java/org/glassfish/grizzly/nio/NIOTransport.java
@@ -83,6 +83,7 @@ import org.glassfish.grizzly.utils.Futures;
 public abstract class NIOTransport extends AbstractTransport
         implements SocketBinder, SocketConnectorHandler,
         TemporarySelectorsEnabledTransport, AsyncQueueEnabledTransport {
+
     private static final Logger LOGGER = Grizzly.logger(NIOTransport.class);
 
     protected SelectorHandler selectorHandler;
@@ -130,8 +131,13 @@ public abstract class NIOTransport extends 
AbstractTransport
     /**
      * Future to control graceful shutdown status
      */
-    private FutureImpl<Transport> shutdownFuture;
-    
+    protected FutureImpl<Transport> shutdownFuture;
+
+    /**
+     * ExecutorService hosting shutdown listener threads.
+     */
+    protected ExecutorService shutdownService;
+
     public NIOTransport(final String name) {
         super(name);
         temporarySelectorIO = createTemporarySelectorIO();
@@ -144,15 +150,21 @@ public abstract class NIOTransport extends 
AbstractTransport
     public abstract void unbindAll();
 
     @Override
-    public synchronized boolean addShutdownListener(ShutdownListener 
shutdownListener) {
-        final State state = getState().getState();
-        if (state != State.STOPPING || state != State.STOPPED) {
-            if (shutdownListeners == null) {
-                shutdownListeners = new HashSet<ShutdownListener>();
+    public boolean addShutdownListener(ShutdownListener shutdownListener) {
+        final Lock lock = state.getStateLocker().writeLock();
+        lock.lock();
+        try {
+            final State stateNow = state.getState();
+            if (stateNow != State.STOPPING || stateNow != State.STOPPED) {
+                if (shutdownListeners == null) {
+                    shutdownListeners = new HashSet<ShutdownListener>();
+                }
+                return shutdownListeners.add(shutdownListener);
             }
-            return shutdownListeners.add(shutdownListener);
+            return false;
+        } finally {
+            lock.unlock();
         }
-        return false;
     }
 
     public SelectionKeyHandler getSelectionKeyHandler() {
@@ -465,93 +477,26 @@ public abstract class NIOTransport extends 
AbstractTransport
             unbindAll();
             shutdownFuture = Futures.createSafeFuture();
 
+            state.setState(State.STOPPING);
+
+            unbindAll();
+            shutdownFuture = Futures.createSafeFuture();
+
             if (shutdownListeners != null && !shutdownListeners.isEmpty()) {
                 final int listenerCount = shutdownListeners.size();
-                final String baseThreadIdentifier =
-                        this.getName()
-                                + " ["
-                                + Integer.toHexString(this.hashCode())
-                                + "]-Shutdown-Thread";
-                final Thread t =
-                        new Thread(baseThreadIdentifier) {
-                            @Override
-                            public void run() {
-
-                                final CountDownLatch shutdownLatch =
-                                        new CountDownLatch(listenerCount);
-
-                                final ExecutorService executorService =
-                                        Executors.newFixedThreadPool(
-                                                listenerCount,
-                                                new ThreadFactory() {
-                                                    private int counter;
-
-                                                    @Override
-                                                    public Thread 
newThread(Runnable r) {
-                                                        Thread t =
-                                                                new Thread(r,
-                                                                           
baseThreadIdentifier
-                                                                             
      + "-Sub(" + counter++ + ')');
-                                                        t.setDaemon(true);
-                                                        return t;
-                                                    }
-                                                });
-
-                                for (final ShutdownListener l : 
shutdownListeners) {
-                                    executorService.execute(new Runnable() {
-                                        @Override
-                                        public void run() {
-                                            l.shutdownRequested(
-                                                    new ShutdownContext() {
-                                                        @Override
-                                                        public Transport 
getTransport() {
-                                                            return 
NIOTransport.this;
-                                                        }
-
-                                                        @Override
-                                                        public void ready() {
-                                                            
shutdownLatch.countDown();
-                                                        }
-                                                    });
-                                        }
-                                    });
-                                }
-
-                                try {
-                                    if (gracePeriod <= 0) {
-                                        shutdownLatch.await();
-                                    } else {
-                                        Boolean result =
-                                                
shutdownLatch.await(gracePeriod,
-                                                                    
timeUnit);
-                                        if (!result) {
-                                            if 
(LOGGER.isLoggable(Level.WARNING)) {
-                                                LOGGER.warning("Shutdown 
grace period exceeded.  Terminating transport.");
-                                            }
-                                        }
-                                    }
-                                } catch (InterruptedException ie) {
-                                    if (LOGGER.isLoggable(Level.WARNING)) {
-                                        LOGGER.warning("Primary shutdown 
thread interrupted.  Forcing transport termination.");
-                                    }
-                                } finally {
-                                    executorService.shutdownNow();
-                                }
-                                finalizeShutdown();
-                                shutdownFuture.result(NIOTransport.this);
-                            }
-                        };
-                t.setDaemon(true);
-                t.start();
+                shutdownService = createShutdownExecutorService();
+                shutdownService.execute(
+                        new GracefulShutdownRunner(gracePeriod,
+                                                   timeUnit,
+                                                   listenerCount));
             } else {
                 finalizeShutdown();
                 shutdownFuture.result(NIOTransport.this);
             }
+            return shutdownFuture;
         } finally {
             lock.unlock();
         }
-
-        return shutdownFuture;
     }
 
     /**
@@ -576,7 +521,14 @@ public abstract class NIOTransport extends 
AbstractTransport
 
             unbindAll();
             state.setState(State.STOPPING);
+            if (shutdownService != null && !shutdownService.isShutdown()) {
+                shutdownService.shutdownNow();
+                shutdownService = null;
+            }
             finalizeShutdown();
+            if (shutdownFuture != null) {
+                shutdownFuture.result(this);
+            }
         } finally {
             lock.unlock();
         }
@@ -729,4 +681,130 @@ public abstract class NIOTransport extends 
AbstractTransport
         this.serverSocketSoTimeout = serverSocketSoTimeout;
         notifyProbesConfigChanged(this);
     }
+
+    protected ExecutorService createShutdownExecutorService() {
+        final String baseThreadIdentifier =
+                this.getName()
+                        + '['
+                        + Integer.toHexString(this.hashCode())
+                        + "]-Shutdown-Thread";
+        final ThreadFactory factory =
+                new ThreadFactory() {
+                    private int counter;
+
+                    @Override
+                    public Thread newThread(Runnable r) {
+                        Thread t =
+                                new Thread(r, baseThreadIdentifier
+                                                 + "(" + counter++ + ')');
+                        t.setDaemon(true);
+                        return t;
+                    }
+                };
+
+        return Executors.newFixedThreadPool(2, factory);
+    }
+
+
+    // ----------------------------------------------------------- Inner 
Classes
+
+
+    class GracefulShutdownRunner implements Runnable {
+
+        private final long gracePeriod;
+        private final TimeUnit timeUnit;
+        private final int listenerCount;
+
+
+        // -------------------------------------------------------- 
Constructors
+
+
+        GracefulShutdownRunner(final long gracePeriod,
+                               final TimeUnit timeUnit,
+                               final int listenerCount) {
+            this.listenerCount = listenerCount;
+            this.gracePeriod = gracePeriod;
+            this.timeUnit = timeUnit;
+        }
+
+
+        // ----------------------------------------------- Methods from 
Runnable
+
+
+        public void run() {
+            final CountDownLatch shutdownLatch =
+                                new CountDownLatch(listenerCount);
+
+            final ShutdownContext shutdownContext =
+                    new ShutdownContext() {
+                        @Override
+                        public Transport getTransport() {
+                            return NIOTransport.this;
+                        }
+
+                        @Override
+                        public void ready() {
+                            shutdownLatch.countDown();
+                        }
+                    };
+
+            // If there there is no timeout, invoke the listeners in the
+            // same thread otherwise use one additional thread to invoke 
them.
+            if (gracePeriod <= 0) {
+                for (final ShutdownListener l : shutdownListeners) {
+                    l.shutdownRequested(shutdownContext);
+                }
+            }  else {
+                shutdownService.execute(new Runnable() {
+                    @Override
+                    public void run() {
+                        for (final ShutdownListener l : shutdownListeners) {
+                            l.shutdownRequested(shutdownContext);
+                        }
+                    }
+                });
+            }
+
+            try {
+                if (gracePeriod <= 0) {
+                    shutdownLatch.await();
+                } else {
+                    if (LOGGER.isLoggable(Level.WARNING)) {
+                        LOGGER.log(Level.WARNING,
+                                   "Shutting down transport {0} in {1} {2}.",
+                                   new Object[] {
+                                           getName() + '[' + 
Integer.toHexString(hashCode()) + ']',
+                                           gracePeriod,
+                                           timeUnit
+                                   });
+                    }
+                    Boolean result =
+                            shutdownLatch.await(gracePeriod,
+                                                timeUnit);
+                    if (!result) {
+                        if (LOGGER.isLoggable(Level.WARNING)) {
+                            LOGGER.log(Level.WARNING,
+                                       "Shutdown grace period exceeded.  
Terminating transport {0}.",
+                                       getName() + '[' + 
Integer.toHexString(hashCode()) + ']'
+                            );
+                        }
+                    }
+                }
+            } catch (InterruptedException ie) {
+                if (LOGGER.isLoggable(Level.WARNING)) {
+                    LOGGER.warning(
+                            "Primary shutdown thread interrupted.  Forcing 
transport termination.");
+                }
+            } finally {
+                if (shutdownService != null && 
!shutdownService.isShutdown()) {
+                    shutdownService.shutdownNow();
+                    shutdownService = null;
+                }
+            }
+            finalizeShutdown();
+            shutdownFuture.result(NIOTransport.this);
+        }
+
+    } // END GracefulShutdownRunner
+
 }--- 
a/modules/grizzly/src/test/java/org/glassfish/grizzly/NIOTransportTest.java
+++ 
b/modules/grizzly/src/test/java/org/glassfish/grizzly/NIOTransportTest.java
@@ -46,7 +46,6 @@ import org.glassfish.grizzly.filterchain.NextAction;
 import org.glassfish.grizzly.filterchain.TransportFilter;
 import org.glassfish.grizzly.impl.FutureImpl;
 import org.glassfish.grizzly.nio.NIOTransport;
-import org.glassfish.grizzly.nio.transport.TCPNIOServerConnection;
 import org.glassfish.grizzly.nio.transport.TCPNIOTransportBuilder;
 import org.glassfish.grizzly.nio.transport.UDPNIOTransportBuilder;
 import org.glassfish.grizzly.strategies.SameThreadIOStrategy;
@@ -65,7 +64,6 @@ import java.net.InetSocketAddress;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.concurrent.CountDownLatch;
-import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
@@ -636,36 +634,41 @@ public class NIOTransportTest {
 
     @Test
     public void testGracefulShutdown() throws Exception {
-        final AtomicBoolean listener1 = new AtomicBoolean();
-        final AtomicBoolean listener2 = new AtomicBoolean();
+        final CountDownLatch latch = new CountDownLatch(2);
         transport.addShutdownListener(new ShutdownListener() {
             @Override
-            public void shutdownRequested(ShutdownContext shutdownContext) {
-                System.out
-                        .println("Shutdown requested: " + 
Thread.currentThread()
-                                .getName());
-                listener1.set(true);
-                try {
-                    Thread.sleep(5000);
-                } catch (InterruptedException e) {
-                    e.printStackTrace();
-                }
-                shutdownContext.ready();
+            public void shutdownRequested(final ShutdownContext 
shutdownContext) {
+                Thread t = new Thread() {
+                    @Override
+                    public void run() {
+                        try {
+                            Thread.sleep(5000);
+                        } catch (InterruptedException ignored) {
+                        }
+                        shutdownContext.ready();
+                        latch.countDown();
+                    }
+                };
+                t.setDaemon(true);
+                t.start();
             }
         });
         transport.addShutdownListener(new ShutdownListener() {
             @Override
-            public void shutdownRequested(ShutdownContext shutdownContext) {
-                System.out
-                        .println("Shutdown requested: " + 
Thread.currentThread()
-                                .getName());
-                listener2.set(true);
-                try {
-                    Thread.sleep(7000);
-                } catch (InterruptedException e) {
-                    e.printStackTrace();
-                }
-                shutdownContext.ready();
+            public void shutdownRequested(final ShutdownContext 
shutdownContext) {
+                Thread t = new Thread() {
+                    @Override
+                    public void run() {
+                        try {
+                            Thread.sleep(7000);
+                        } catch (InterruptedException ignored) {
+                        }
+                        shutdownContext.ready();
+                        latch.countDown();
+                    }
+                };
+                t.setDaemon(true);
+                t.start();
             }
         });
         transport.start();
@@ -674,59 +677,167 @@ public class NIOTransportTest {
         Transport tt = future.get(10, TimeUnit.SECONDS);
         long stop = System.currentTimeMillis();
         assertTrue((stop - start) >= 7000);
-        assertTrue(listener1.get());
-        assertTrue(listener2.get());
         assertEquals(transport, tt);
         assertTrue(transport.isStopped());
     }
 
     @Test
     public void testGracefulShutdownWithGracePeriod() throws Exception {
+        transport.addShutdownListener(new ShutdownListener() {
+            @Override
+            public void shutdownRequested(final ShutdownContext 
shutdownContext) {
+                Thread t = new Thread() {
+                    @Override
+                    public void run() {
+                        try {
+                            Thread.sleep(4000);
+                        } catch (InterruptedException ignored) {
+                        }
+                        shutdownContext.ready();
+                    }
+                };
+                t.setDaemon(true);
+                t.start();
+            }
+        });
+        transport.addShutdownListener(new ShutdownListener() {
+            @Override
+            public void shutdownRequested(final ShutdownContext 
shutdownContext) {
+                Thread t = new Thread() {
+                    @Override
+                    public void run() {
+                        try {
+                            Thread.sleep(3000);
+                        } catch (InterruptedException ignored) {
+                        }
+                        shutdownContext.ready();
+                    }
+                };
+                t.setDaemon(true);
+                t.start();
+            }
+        });
+        transport.start();
+        GrizzlyFuture<Transport> future =
+                transport.shutdown(5, TimeUnit.SECONDS);
+        Transport tt = future.get(5100, TimeUnit.MILLISECONDS);
+        assertTrue(transport.isStopped());
+        assertEquals(transport, tt);
+
+    }
+
+    @Test
+    public void testGracefulShutdownWithGracePeriodTimeout() throws 
Exception {
+        transport.addShutdownListener(new ShutdownListener() {
+            @Override
+            public void shutdownRequested(final ShutdownContext 
shutdownContext) {
+                Thread t = new Thread() {
+                    @Override
+                    public void run() {
+                        try {
+                            Thread.sleep(10000);
+                        } catch (InterruptedException ignored) {
+                        }
+                        shutdownContext.ready();
+                    }
+                };
+                t.setDaemon(true);
+                t.start();
+            }
+        });
+        transport.addShutdownListener(new ShutdownListener() {
+            @Override
+            public void shutdownRequested(final ShutdownContext 
shutdownContext) {
+                Thread t = new Thread() {
+                    @Override
+                    public void run() {
+                        try {
+                            Thread.sleep(5000);
+                        } catch (InterruptedException ignored) {
+                        }
+                        shutdownContext.ready();
+                    }
+                };
+                t.setDaemon(true);
+                t.start();
+            }
+        });
+        transport.start();
+        GrizzlyFuture<Transport> future = transport.shutdown(5, 
TimeUnit.SECONDS);
+        Transport tt = future.get(5100, TimeUnit.MILLISECONDS);
+        assertTrue(transport.isStopped());
+        assertEquals(transport, tt);
+    }
+
+    @Test
+    public void testGracefulShutdownAndThenForced() throws Exception {
         final AtomicBoolean listener1 = new AtomicBoolean();
         final AtomicBoolean listener2 = new AtomicBoolean();
-        final AtomicBoolean interrupted1 = new AtomicBoolean();
-        final AtomicBoolean interrupted2 = new AtomicBoolean();
         transport.addShutdownListener(new ShutdownListener() {
             @Override
-            public void shutdownRequested(ShutdownContext shutdownContext) {
-                System.out.println(
-                        "Shutdown requested: " + Thread.currentThread()
-                                .getName());
-                listener1.set(true);
-                try {
-                    Thread.sleep(10000);
-                } catch (InterruptedException e) {
-                    interrupted1.set(true);
-                    return;
-                }
-                shutdownContext.ready();
+            public void shutdownRequested(final ShutdownContext 
shutdownContext) {
+                listener1.compareAndSet(false, true);
+                Thread t = new Thread() {
+                    @Override
+                    public void run() {
+                        try {
+                            Thread.sleep(20000);
+                        } catch (InterruptedException ignored) {
+                        }
+                        shutdownContext.ready();
+                    }
+                };
+                t.setDaemon(true);
+                t.start();
             }
         });
         transport.addShutdownListener(new ShutdownListener() {
             @Override
+            public void shutdownRequested(final ShutdownContext 
shutdownContext) {
+                listener2.compareAndSet(false, true);
+                Thread t = new Thread() {
+                    @Override
+                    public void run() {
+                        try {
+                            Thread.sleep(20000);
+                        } catch (InterruptedException ignored) {
+                        }
+                        shutdownContext.ready();
+                    }
+                };
+                t.setDaemon(true);
+                t.start();
+            }
+        });
+        transport.start();
+        GrizzlyFuture<Transport> future = transport.shutdown();
+        Thread.sleep(3000);
+        transport.shutdownNow();
+        Transport tt = future.get(1, TimeUnit.SECONDS);
+        assertEquals(transport, tt);
+        assertTrue(transport.isStopped());
+        assertTrue(listener1.get());
+        assertTrue(listener2.get());
+    }
+
+    @Test
+    public void testTimedGracefulShutdownAndThenForced() throws Exception {
+        transport.addShutdownListener(new ShutdownListener() {
+            @Override
             public void shutdownRequested(ShutdownContext shutdownContext) {
-                System.out.println(
-                        "Shutdown requested: " + Thread.currentThread()
-                                .getName());
-                listener2.set(true);
                 try {
-                    Thread.sleep(11000);
-                } catch (InterruptedException e) {
-                    interrupted2.set(true);
-                    return;
+                    Thread.sleep(20000);
+                } catch (InterruptedException ignored) {
                 }
                 shutdownContext.ready();
             }
         });
-        transport.start();
-        GrizzlyFuture<Transport> future =
-                transport.shutdown(5, TimeUnit.SECONDS);
-        Transport tt = future.get();
 
-        assertTrue(listener1.get());
-        assertTrue(listener2.get());
-        assertTrue(interrupted1.get());
-        assertTrue(interrupted2.get());
+        transport.start();
+        GrizzlyFuture<Transport> future = transport.shutdown(5, 
TimeUnit.MINUTES);
+        Thread.sleep(3000);
+        transport.shutdownNow();
+        final Transport tt = future.get(1, TimeUnit.SECONDS);
         assertEquals(transport, tt);
         assertTrue(transport.isStopped());
     }





[grizzly~git:395059a7] [2.3.x] Incremental changes for https://java.net/jira/browse/GRIZZLY-1546

rlubke 07/18/2013
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