How to use

DynamicListProperty

in

com.netflix.config

@Override
public List<String> getNamedMaps() {
  return KEYS.get();
}

private void propertyChangedInternal() {
  load();
  propertyChanged();
}

/**
 * Create the dynamic list property. The guava Splitter used is created as
 * <code>Splitter.onPattern(delimiterRegex).omitEmptyStrings().trimResults()</code>. The default
 * list value will be taken from the passed in list argument.
 */
public DynamicListProperty(String propName, List<T> defaultValue, String delimiterRegex) {
  setup(propName, defaultValue, delimiterRegex);
}

/**
 * Create the dynamic list property. The guava Splitter used is created as
 * <code>Splitter.onPattern(delimiterRegex).omitEmptyStrings().trimResults()</code>. The default
 * list value will be transformed from list of strings after splitting. If defaultValue string is
 * null, the default list value will be an empty list.
 */
public DynamicListProperty(String propName, String defaultValue, String delimiterRegex) {
  this.splitter = Splitter.onPattern(delimiterRegex).omitEmptyStrings().trimResults();
  setup(propName, transform(split(defaultValue)), splitter);
}

protected void load() {
  if (delegate.get() == null) {
    values = defaultValues;
  } else {
    values = transform(split(delegate.get()));
  }
}

protected List<T> transform(List<String> stringValues) {
  List<T> list = new ArrayList<T>(stringValues.size());
  for (String s : stringValues) {
    list.add(from(s));
  }
  return Collections.unmodifiableList(list);    
}

private void setup(String propName, List<T> defaultValue, Splitter splitter) {
  // Make a defensive copy of the default value. Would prefer to use an ImmutableList, but that
  // does not allow for null values in the List.
  this.defaultValues = (defaultValue == null ? null : 
    Collections.unmodifiableList(new ArrayList<T>(defaultValue)));
  
  this.splitter = splitter;
  delegate = DynamicPropertyFactory.getInstance().getStringProperty(propName, null);
  load();
  Runnable callback = new Runnable() {
    @Override
    public void run() {
      propertyChangedInternal();
    }
  };
  delegate.addCallback(callback);
}

/**
 * Create the dynamic list property. The guava Splitter used is created as
 * <code>Splitter.onPattern(delimiterRegex).omitEmptyStrings().trimResults()</code>. The default
 * list value will be transformed from list of strings after splitting. If defaultValue string is
 * null, the default list value will be an empty list.
 */
public DynamicListProperty(String propName, String defaultValue, String delimiterRegex) {
  this.splitter = Splitter.onPattern(delimiterRegex).omitEmptyStrings().trimResults();
  setup(propName, transform(split(defaultValue)), splitter);
}

protected void load() {
  if (delegate.get() == null) {
    values = defaultValues;
  } else {
    values = transform(split(delegate.get()));
  }
}

protected List<T> transform(List<String> stringValues) {
  List<T> list = new ArrayList<T>(stringValues.size());
  for (String s : stringValues) {
    list.add(from(s));
  }
  return Collections.unmodifiableList(list);    
}

private void setup(String propName, List<T> defaultValue, Splitter splitter) {
  // Make a defensive copy of the default value. Would prefer to use an ImmutableList, but that
  // does not allow for null values in the List.
  this.defaultValues = (defaultValue == null ? null : 
    Collections.unmodifiableList(new ArrayList<T>(defaultValue)));
  
  this.splitter = splitter;
  delegate = DynamicPropertyFactory.getInstance().getStringProperty(propName, null);
  load();
  Runnable callback = new Runnable() {
    @Override
    public void run() {
      propertyChangedInternal();
    }
  };
  delegate.addCallback(callback);
}

@Override
public List<T> getValue() {
  return get();
}

private void propertyChangedInternal() {
  load();
  propertyChanged();
}

/**
 * Create the dynamic list property using the splitter and default list value passed in 
 * from the arguments.
 */
public DynamicListProperty(String propName, List<T> defaultValue, Splitter splitter) {
  setup(propName, defaultValue, splitter);
}

@Override
public List<T> getValue() {
  return get();
}

/**
 * Create the dynamic list property using the splitter and default list value passed in 
 * from the arguments.
 */
public DynamicListProperty(String propName, List<T> defaultValue, Splitter splitter) {
  setup(propName, defaultValue, splitter);
}

public static List<String> getStringList(String property) {
  final DynamicListProperty<String> listProperty = new DynamicStringListProperty(property, "");
  return listProperty.get();
}

/**
 * Create the dynamic list property. The guava Splitter used is created as
 * <code>Splitter.onPattern(delimiterRegex).omitEmptyStrings().trimResults()</code>. The default
 * list value will be taken from the passed in list argument.
 */
public DynamicListProperty(String propName, List<T> defaultValue, String delimiterRegex) {
  setup(propName, defaultValue, delimiterRegex);
}

@Override
protected void populateContext(Agent agent, Instance instance, ConfigItem item, ArchiveContext context) {
  context.getData().put("data", map.getMap(name));
  if (instance != null) {
    return;
  }
  Client client = new Client(Agent.class, agent.getId());
  ConfigUpdateRequest request = new ConfigUpdateRequest(client).withDeferredTrigger(true);
  for (String itemName : REQUIRED.get()) {
    if (!statusManager.isAssigned(client, itemName)) {
      log.info("Adding missing [{}] to agent [{}]", itemName, agent.getId());
      request.addItem(itemName);
    }
  }
  if (request.getItems().size() > 0) {
    statusManager.updateConfig(request);
  }
}

private void setup(String propName, List<T> defaultValue, String delimiterRegex) {
  setup(propName, defaultValue, Splitter.onPattern(delimiterRegex).omitEmptyStrings().trimResults());
}