opendaylight/config/config-manager/src/main/java/org/opendaylight/controller/config/manager/impl/osgi/BlankTransactionServiceTracker.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.manager.impl.osgi;
   9
  10 import org.opendaylight.controller.config.api.ConflictingVersionException;
  11 import org.opendaylight.controller.config.api.jmx.CommitStatus;
  12 import org.opendaylight.controller.config.manager.impl.ConfigRegistryImpl;
  13 import org.opendaylight.controller.config.spi.ModuleFactory;
  14 import org.osgi.framework.ServiceReference;
  15 import org.osgi.util.tracker.ServiceTrackerCustomizer;
  16 import org.slf4j.Logger;
  17 import org.slf4j.LoggerFactory;
  18
  19 import javax.management.ObjectName;
  20
  21 /**
  22  * Every time factory is added or removed, blank transaction is triggered to handle
  23  * {@link org.opendaylight.controller.config.spi.ModuleFactory#getDefaultModules(org.opendaylight.controller.config.api.DependencyResolverFactory, org.osgi.framework.BundleContext)}
  24  * functionality.
  25  */
  26 public class BlankTransactionServiceTracker implements ServiceTrackerCustomizer<ModuleFactory, Object> {
  27     private static final Logger logger = LoggerFactory.getLogger(BlankTransactionServiceTracker.class);
  28
  29     private final ConfigRegistryImpl configRegistry;
  30
  31     public BlankTransactionServiceTracker(ConfigRegistryImpl configRegistry) {
  32         this.configRegistry = configRegistry;
  33     }
  34
  35     @Override
  36     public Object addingService(ServiceReference<ModuleFactory> moduleFactoryServiceReference) {
  37         blankTransaction();
  38         return null;
  39     }
  40
  41     private synchronized void blankTransaction() {
  42         // race condition check: config-persister might push new configuration while server is starting up.
  43         ConflictingVersionException lastException = null;
  44         for (int i = 0; i < 10; i++) {
  45             try {
  46                 // create transaction
  47                 ObjectName tx = configRegistry.beginConfig();
  48                 CommitStatus commitStatus = configRegistry.commitConfig(tx);
  49                 logger.debug("Committed blank transaction with status {}", commitStatus);
  50                 return;
  51             } catch (ConflictingVersionException e) {
  52                 lastException = e;
  53                 try {
  54                     Thread.sleep(1000);
  55                 } catch (InterruptedException interruptedException) {
  56                     Thread.currentThread().interrupt();
  57                     throw new IllegalStateException(interruptedException);
  58                 }
  59             }
  60         }
  61         throw lastException;
  62     }
  63
  64     @Override
  65     public void modifiedService(ServiceReference <ModuleFactory> moduleFactoryServiceReference, Object o) {
  66         blankTransaction();
  67     }
  68
  69     @Override
  70     public void removedService(ServiceReference<ModuleFactory> moduleFactoryServiceReference, Object o) {
  71         blankTransaction();
  72     }
  73 }