opendaylight/md-sal/sal-binding-broker/src/main/java/org/opendaylight/controller/sal/binding/codegen/impl/SingletonHolder.java

   1 /*
   2  * Copyright (c) 2014 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.sal.binding.codegen.impl;
   9
  10 import java.util.concurrent.ExecutorService;
  11 import java.util.concurrent.Executors;
  12 import java.util.concurrent.ThreadFactory;
  13
  14 import javassist.ClassPool;
  15
  16 import org.opendaylight.controller.sal.binding.codegen.RuntimeCodeGenerator;
  17 import org.opendaylight.controller.sal.binding.spi.NotificationInvokerFactory;
  18
  19 import com.google.common.util.concurrent.ListeningExecutorService;
  20 import com.google.common.util.concurrent.MoreExecutors;
  21 import com.google.common.util.concurrent.ThreadFactoryBuilder;
  22
  23 public class SingletonHolder {
  24
  25     public static final ClassPool CLASS_POOL = new ClassPool();
  26     public static final org.opendaylight.controller.sal.binding.codegen.impl.RuntimeCodeGenerator RPC_GENERATOR_IMPL = new org.opendaylight.controller.sal.binding.codegen.impl.RuntimeCodeGenerator(
  27             CLASS_POOL);
  28     public static final RuntimeCodeGenerator RPC_GENERATOR = RPC_GENERATOR_IMPL;
  29     public static final NotificationInvokerFactory INVOKER_FACTORY = RPC_GENERATOR_IMPL.getInvokerFactory();
  30     private static ListeningExecutorService NOTIFICATION_EXECUTOR = null;
  31     private static ListeningExecutorService COMMIT_EXECUTOR = null;
  32
  33     public static synchronized final ListeningExecutorService getDefaultNotificationExecutor() {
  34         if (NOTIFICATION_EXECUTOR == null) {
  35             NOTIFICATION_EXECUTOR = createNamedExecutor("md-sal-binding-notification-%d");
  36         }
  37         return NOTIFICATION_EXECUTOR;
  38     }
  39
  40     /**
  41      * @deprecated This method is only used from configuration modules and thus callers of it
  42      *             should use service injection to make the executor configurable.
  43      */
  44     @Deprecated
  45     public static synchronized final ListeningExecutorService getDefaultCommitExecutor() {
  46         if (COMMIT_EXECUTOR == null) {
  47             ThreadFactory factory = new ThreadFactoryBuilder().setDaemon(true).setNameFormat("md-sal-binding-commit-%d").build();
  48             /*
  49              * FIXME: this used to be newCacheThreadPool(), but MD-SAL does not have transaction
  50              *        ordering guarantees, which means that using a concurrent threadpool results
  51              *        in application data being committed in random order, potentially resulting
  52              *        in inconsistent data being present. Once proper primitives are introduced,
  53              *        concurrency can be reintroduced.
  54              */
  55             ExecutorService executor = Executors.newSingleThreadExecutor(factory);
  56             COMMIT_EXECUTOR = MoreExecutors.listeningDecorator(executor);
  57         }
  58
  59         return COMMIT_EXECUTOR;
  60     }
  61
  62     private static ListeningExecutorService createNamedExecutor(String format) {
  63         ThreadFactory factory = new ThreadFactoryBuilder().setDaemon(true).setNameFormat(format).build();
  64         ExecutorService executor = Executors.newCachedThreadPool(factory);
  65         return MoreExecutors.listeningDecorator(executor);
  66     }
  67 }