opendaylight/config/netty-event-executor-config/src/main/java/org/opendaylight/controller/config/yang/netty/eventexecutor/AutoCloseableEventExecutor.java

   1 /*
   2  * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.controller.config.yang.netty.eventexecutor;
   9
  10 import com.google.common.reflect.AbstractInvocationHandler;
  11 import com.google.common.reflect.Reflection;
  12 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
  13 import io.netty.util.concurrent.EventExecutor;
  14 import io.netty.util.concurrent.GlobalEventExecutor;
  15 import io.netty.util.concurrent.ImmediateEventExecutor;
  16 import java.lang.reflect.Method;
  17 import java.util.concurrent.TimeUnit;
  18
  19 public interface AutoCloseableEventExecutor extends EventExecutor, AutoCloseable {
  20
  21     static AutoCloseableEventExecutor globalEventExecutor() {
  22         return CloseableEventExecutorMixin.createCloseableProxy(GlobalEventExecutor.INSTANCE);
  23     }
  24
  25     static AutoCloseableEventExecutor immediateEventExecutor() {
  26         return CloseableEventExecutorMixin.createCloseableProxy(ImmediateEventExecutor.INSTANCE);
  27     }
  28
  29     class CloseableEventExecutorMixin implements AutoCloseable {
  30         public static final int DEFAULT_SHUTDOWN_SECONDS = 1;
  31         private final EventExecutor eventExecutor;
  32
  33         public CloseableEventExecutorMixin(final EventExecutor eventExecutor) {
  34             this.eventExecutor = eventExecutor;
  35         }
  36
  37         @Override
  38         @SuppressFBWarnings(value = "UC_USELESS_VOID_METHOD", justification = "False positive")
  39         public void close() {
  40             eventExecutor.shutdownGracefully(0, DEFAULT_SHUTDOWN_SECONDS, TimeUnit.SECONDS);
  41         }
  42
  43         static AutoCloseableEventExecutor createCloseableProxy(final EventExecutor eventExecutor) {
  44             final CloseableEventExecutorMixin closeableEventExecutor = new CloseableEventExecutorMixin(eventExecutor);
  45             return Reflection.newProxy(AutoCloseableEventExecutor.class, new AbstractInvocationHandler() {
  46                 @Override
  47                 protected Object handleInvocation(final Object proxy, final Method method, final Object[] args)
  48                         throws Throwable {
  49                     if (method.getName().equals("close")) {
  50                         closeableEventExecutor.close();
  51                         return null;
  52                     } else {
  53                         return method.invoke(closeableEventExecutor.eventExecutor, args);
  54                     }
  55                 }
  56             });
  57         }
  58     }
  59 }