Examples of com.linkedin.d2.balancer.util.HostToKeyMapper

com.linkedin.d2.discovery.event.PropertyEventThread.PropertyEvent
Contains the result of KeyMapper.mapKeysV3. This data object can compute the mapping of hosts to keys for a particular "iteration" Example use case: We have 2 keys 1 and 2. Let's say for key 1, there are host 1,2,3. and for key 2 there is only host 4. Let's say the user wants 2 hosts per key. Then this object will contain the following mapping { list: - [key 1], [host1, host2] - [key 2], [host4] } when the user calls getFirstResult(), this indicates the user wants to know the mapping of the first "iteration". So we return: { - [key1], [host1] - [key2], [host4] } when the user calls getResult(1), this indicates the user wants to know the mapping of the second "iteration". So we return the following { - [key1] , [host2] - [key2] is unmapped } ------------------------ It's possible that the same host appears twice depending on how the cluster is being partitioned. For example We have keys 1,2,3. keys 1 is served by host 1,2 keys 2 is served by host 2,3 keys 3 is served by host 1,3 we want to get 2 hosts per key because we want to try a backup retry We provide a method in HostToKeyMapper to "combine" the result depending on which "iteration" are you on So for the first try we will return { list: - [key1, key3], [host 1] - [key2]. [host2] } for the 2nd try we will return { list: - [key1], [host2] - [key2, key3]. [host3] } Note that host2 appears twice and it appears on different key depending on which try you're on. @author Oby Sumampouw (osumampouw@linkedin.com)

      return fromMap(untyped);


    }
    catch (Exception e)
    {
      throw new PropertySerializationException(e);
    }
  }

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      return fromMap(untyped);


    }
    catch (Exception e)
    {
      throw new PropertySerializationException(e);
    }
  }

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  }


  @Override
  public void register(final PropertyEventSubscriber<T> listener)
  {
    _thread.send(new PropertyEvent("PropertyEventBus.registerAll")
    {
      @Override
      public void innerRun()
      {
        _allPropertySubscribers.add(listener);

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  }


  @Override
  public void unregister(final PropertyEventSubscriber<T> listener)
  {
    _thread.send(new PropertyEvent("PropertyEventBus.unregisterAll")
    {
      @Override
      public void innerRun()
      {
        _allPropertySubscribers.remove(listener);

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  @Override
  public void register(final Set<String> propertyNames,
                       final PropertyEventSubscriber<T> subscriber)
  {
    _thread.send(new PropertyEvent("PropertyEventBus.register " + propertyNames)
    {
      public void innerRun()
      {
        for (final String prop : propertyNames)
        {

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  @Override
  public void unregister(final Set<String> propertyNames,
                         final PropertyEventSubscriber<T> subscriber)
  {
    _thread.send(new PropertyEvent("PropertyEventBus.unregister " + propertyNames)
    {
      public void innerRun()
      {
        for (final String prop : propertyNames)
        {

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  @Override
  public void setPublisher(final PropertyEventPublisher<T> publisher)
  {


    _thread.send(new PropertyEvent("PropertyEventBus.setPublisher")
    {
      public void innerRun()
      {
        if (_publisher != null)
        {

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    if (value == null)
    {
      _log.warn("Received a null event during publishInitialize for String prop = " + prop +
                    ". Still publishing the null event.");
    }
    _thread.send(new PropertyEvent("PropertyEventBus.publishInitialize " + prop)
    {
      public void innerRun()
      {
        // Because the bus can switch publishers, a new publisher may consider an event
        // an "initialize", but if the bus has previously seen that property, we will treat

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    if (value == null)
    {
      _log.warn("Received a null event during publishAdd for String prop = " + prop +
                    ". Still publishing the null event.");
    }
    _thread.send(new PropertyEvent("PropertyEventBus.publishAdd " + prop)
    {
      public void innerRun()
      {
        // Ignore unless the property has been initialized
        if (_properties.containsKey(prop))

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  }


  @Override
  public void publishRemove(final String prop)
  {
    _thread.send(new PropertyEvent("PropertyEventBus.publishRemove " + prop)
    {
      public void innerRun()
      {
        // Ignore unless the property has been initialized
        if (_properties.containsKey(prop))

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