/// <summary>
/// 当配置更新时，被调用
/// </summary>
/// <param name="event"> </param>
public virtual void propertiesReloaded(PropertiesReloadedEvent @event)
{
Properties oldProperties = lastMergedProperties;
try
{
//
Properties newProperties = mergeProperties();
//
// 获取哪些 dynamic property 被影响
//
ISet<string> placeholders = placeholderToDynamics.Keys;
ISet<DynamicProperty> allDynamics = new HashSet<DynamicProperty>();
foreach (string placeholder in placeholders)
{
string newValue = newProperties.getProperty(placeholder);
string oldValue = oldProperties.getProperty(placeholder);
if (!string.ReferenceEquals(newValue, null) && !newValue.Equals(oldValue) || string.ReferenceEquals(newValue, null) && !string.ReferenceEquals(oldValue, null))
{
if (logger.InfoEnabled)
{
logger.info("Property changed detected: " + placeholder + (!string.ReferenceEquals(newValue, null) ? "=" + newValue : " removed"));
}
IList<DynamicProperty> affectedDynamics = placeholderToDynamics[placeholder];
allDynamics.addAll(affectedDynamics);
}
}
//
// 获取受影响的beans
//
IDictionary<string, IList<DynamicProperty>> dynamicsByBeanName = new Dictionary<string, IList<DynamicProperty>>();
IDictionary<string, object> beanByBeanName = new Dictionary<string, object>();
foreach (DynamicProperty dynamic in allDynamics)
{
string beanName = dynamic.BeanName;
IList<DynamicProperty> l = dynamicsByBeanName[beanName];
if (l == null)
{
dynamicsByBeanName[beanName] = (l = new List<DynamicProperty>());
object bean = null;
try
{
bean = applicationContext.getBean(beanName);
beanByBeanName[beanName] = bean;
}
catch (BeansException e)
{
// keep dynamicsByBeanName list, warn only once.
logger.error("Error obtaining bean " + beanName, e);
}
//
// say hello
//
try
{
if (bean is IReconfigurationAware)
{
((IReconfigurationAware) bean).beforeReconfiguration(); // hello!
}
}
catch (Exception e)
{
logger.error("Error calling beforeReconfiguration on " + beanName, e);
}
}
l.Add(dynamic);
}
//
// 处理受影响的bean
//
IDictionary<string, IList<DynamicProperty>>.KeyCollection beanNames = dynamicsByBeanName.Keys;
foreach (string beanName in beanNames)
{
object bean = beanByBeanName[beanName];
if (bean == null) // problems obtaining bean, earlier
{
continue;
}
BeanWrapper beanWrapper = new BeanWrapperImpl(bean);
// for all affected ...
IList<DynamicProperty> dynamics = dynamicsByBeanName[beanName];
foreach (DynamicProperty dynamic in dynamics)
{
string propertyName = dynamic.PropertyName;
string unparsedValue = dynamic.UnparsedValue;
// obtain an updated value, including dependencies
string newValue;
removeDynamic(dynamic);
currentBeanName = beanName;
currentPropertyName = propertyName;
try
{
newValue = parseStringValue(unparsedValue, newProperties, new HashSet());
}
finally
{
currentBeanName = null;
currentPropertyName = null;
}
if (logger.InfoEnabled)
{
logger.info("Updating property " + beanName + "." + propertyName + " to " + newValue);
}
// assign it to the bean
try
{
beanWrapper.setPropertyValue(propertyName, newValue);
}
catch (BeansException e)
{
logger.error("Error setting property " + beanName + "." + propertyName + " to " + newValue, e);
}
}
}
//
// say goodbye.
//
foreach (string beanName in beanNames)
{
object bean = beanByBeanName[beanName];
try
{
if (bean is IReconfigurationAware)
{
((IReconfigurationAware) bean).afterReconfiguration();
}
}
catch (Exception e)
{
logger.error("Error calling afterReconfiguration on " + beanName, e);
}
}
}
catch (IOException e)
{
logger.error("Error trying to reload net.unicon.iamlabs.spring.properties.example.net.unicon.iamlabs" + ".spring" + ".properties: " + e.Message, e);
}
}
/// <summary>
/// 通过listener去通知 reload
/// </summary>
/// <param name="oldProperties"> </param>
protected internal virtual void notifyPropertiesChanged(Properties oldProperties)
{
PropertiesReloadedEvent @event = new PropertiesReloadedEvent(this, oldProperties);
foreach (IReloadablePropertiesListener listener in listeners)
{
listener.propertiesReloaded(@event);
}
}
