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.ScheduledExecutorService;
  13 import java.util.concurrent.ThreadFactory;
  14
  15 import org.opendaylight.controller.sal.binding.codegen.RuntimeCodeGenerator;
  16 import org.opendaylight.controller.sal.binding.spi.NotificationInvokerFactory;
  17
  18 import com.google.common.util.concurrent.ListeningExecutorService;
  19 import com.google.common.util.concurrent.MoreExecutors;
  20 import com.google.common.util.concurrent.ThreadFactoryBuilder;
  21
  22 import javassist.ClassPool;
  23
  24 public class SingletonHolder {
  25
  26     public static final ClassPool CLASS_POOL = new ClassPool();
  27     public static final org.opendaylight.controller.sal.binding.codegen.impl.RuntimeCodeGenerator RPC_GENERATOR_IMPL = new org.opendaylight.controller.sal.binding.codegen.impl.RuntimeCodeGenerator(
  28             CLASS_POOL);
  29     public static final RuntimeCodeGenerator RPC_GENERATOR = RPC_GENERATOR_IMPL;
  30     public static final NotificationInvokerFactory INVOKER_FACTORY = RPC_GENERATOR_IMPL.getInvokerFactory();
  31     private static ListeningExecutorService NOTIFICATION_EXECUTOR = null;
  32     private static ListeningExecutorService COMMIT_EXECUTOR = null;
  33
  34     public static synchronized final ListeningExecutorService getDefaultNotificationExecutor() {
  35         if (NOTIFICATION_EXECUTOR == null) {
  36             NOTIFICATION_EXECUTOR = createNamedExecutor("md-sal-binding-notification-%d");
  37         }
  38         return NOTIFICATION_EXECUTOR;
  39     }
  40
  41     /**
  42      * @deprecated This method is only used from configuration modules and thus callers of it
  43      *             should use service injection to make the executor configurable.
  44      */
  45     @Deprecated
  46     public static synchronized final ListeningExecutorService getDefaultCommitExecutor() {
  47         if (COMMIT_EXECUTOR == null) {
  48             ThreadFactory factory = new ThreadFactoryBuilder().setDaemon(true).setNameFormat("md-sal-binding-commit-%d").build();
  49             /*
  50              * FIXME: this used to be newCacheThreadPool(), but MD-SAL does not have transaction
  51              *        ordering guarantees, which means that using a concurrent threadpool results
  52              *        in application data being committed in random order, potentially resulting
  53              *        in inconsistent data being present. Once proper primitives are introduced,
  54              *        concurrency can be reintroduced.
  55              */
  56             ExecutorService executor = Executors.newSingleThreadExecutor(factory);
  57             COMMIT_EXECUTOR = MoreExecutors.listeningDecorator(executor);
  58         }
  59
  60         return COMMIT_EXECUTOR;
  61     }
  62
  63     private static ListeningExecutorService createNamedExecutor(String format) {
  64         ThreadFactory factory = new ThreadFactoryBuilder().setDaemon(true).setNameFormat(format).build();
  65         ExecutorService executor = Executors.newCachedThreadPool(factory);
  66         return MoreExecutors.listeningDecorator(executor);
  67     }
  68 }