/**
* This method performs threshold checks and invokes filters before delegating actual logging to
* the subclasses specific {@link AppenderSkeleton#append} method.
*/
public synchronized void doAppend(LoggingEvent event) {
if (closed) {
LogLog.error("Attempted to append to closed appender named [" + name + "].");
return;
}
if (!isAsSevereAsThreshold(event.getLevel())) {
return;
}
Filter f = this.headFilter;
FILTER_LOOP:
while (f != null) {
switch (f.decide(event)) {
case Filter.DENY:
return;
case Filter.ACCEPT:
break FILTER_LOOP;
case Filter.NEUTRAL:
f = f.getNext();
}
}
this.append(event);
}
/**
* Add a filter to end of the filter list.
*
* @since 0.9.0
*/
public void addFilter(Filter newFilter) {
if (headFilter == null) {
headFilter = tailFilter = newFilter;
} else {
tailFilter.setNext(newFilter);
tailFilter = newFilter;
}
}
void parseAppenderFilters(Properties props, String appenderName, Appender appender) {
// extract filters and filter options from props into a hashtable mapping
// the property name defining the filter class to a list of pre-parsed
// name-value pairs associated to that filter
final String filterPrefix = APPENDER_PREFIX + appenderName + ".filter.";
int fIdx = filterPrefix.length();
Hashtable filters = new Hashtable();
Enumeration e = props.keys();
String name = "";
while (e.hasMoreElements()) {
String key = (String) e.nextElement();
if (key.startsWith(filterPrefix)) {
int dotIdx = key.indexOf('.', fIdx);
String filterKey = key;
if (dotIdx != -1) {
filterKey = key.substring(0, dotIdx);
name = key.substring(dotIdx + 1);
}
Vector filterOpts = (Vector) filters.get(filterKey);
if (filterOpts == null) {
filterOpts = new Vector();
filters.put(filterKey, filterOpts);
}
if (dotIdx != -1) {
String value = OptionConverter.findAndSubst(key, props);
filterOpts.add(new NameValue(name, value));
}
}
}
// sort filters by IDs, insantiate filters, set filter options,
// add filters to the appender
Enumeration g = new SortedKeyEnumeration(filters);
while (g.hasMoreElements()) {
String key = (String) g.nextElement();
String clazz = props.getProperty(key);
if (clazz != null) {
LogLog.debug(
"Filter key: ["
+ key
+ "] class: ["
+ props.getProperty(key)
+ "] props: "
+ filters.get(key));
Filter filter = (Filter) OptionConverter.instantiateByClassName(clazz, Filter.class, null);
if (filter != null) {
PropertySetter propSetter = new PropertySetter(filter);
Vector v = (Vector) filters.get(key);
Enumeration filterProps = v.elements();
while (filterProps.hasMoreElements()) {
NameValue kv = (NameValue) filterProps.nextElement();
propSetter.setProperty(kv.key, kv.value);
}
propSetter.activate();
LogLog.debug(
"Adding filter of type ["
+ filter.getClass()
+ "] to appender named ["
+ appender.getName()
+ "].");
appender.addFilter(filter);
}
} else {
LogLog.warn("Missing class definition for filter: [" + key + "]");
}
}
}