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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.logserver.filter;
import com.yahoo.log.LogLevel;
import java.util.HashMap;
import java.util.Map;
/**
* The LogFilterManager keeps track of associations between
* LogFilter names and instances, so that access to filters
* is truly global. It also manages the LogFilter namespace
* to ensure that system-defined filters are not tampered with.
*
* @author Bjorn Borud
*/
@SuppressWarnings("deprecation")
public class LogFilterManager {
private static final LogFilterManager instance;
static {
instance = new LogFilterManager();
LevelFilter allEvents = new LevelFilter();
allEvents.addLevel(LogLevel.EVENT);
instance.addLogFilterInternal("system.allevents", allEvents);
instance.addLogFilterInternal("system.all", new NullFilter());
instance.addLogFilterInternal("system.mute", MuteFilter.getInstance());
}
private final Map<String, LogFilter> filters = new HashMap<String, LogFilter>();
private LogFilterManager() {
}
/**
* Public interface for adding a name-logfilter mapping. If
* there exists a mapping already the old mapping is replaced
* with the new mapping.
* <p>
* If the name is within the namespace reserved for internal
* built-in filters it will throw an exception
*/
public static void addLogFilter(String name, LogFilter filter) {
if (filter == null) {
throw new NullPointerException("filter cannot be null");
}
if (name == null) {
throw new NullPointerException("name cannot be null");
}
String n = name.toLowerCase();
if (n.startsWith("system.")) {
throw new IllegalArgumentException("'system' namespace is reserved");
}
instance.addLogFilterInternal(n, filter);
}
/**
* LogFilter lookup function
*
* @param name The name of the LogFilter to be looked up.
* @return Returns the LogFilter associated with this name or
* <code>null</code> if not found.
*/
public static LogFilter getLogFilter(String name) {
return instance.filters.get(name);
}
/**
* Get the names of the defined filters.
*
* @return Returns an array containing the names of filters that
* have been registered.
*/
public static String[] getFilterNames() {
synchronized (instance.filters) {
String[] filterNames = new String[instance.filters.keySet().size()];
instance.filters.keySet().toArray(filterNames);
return filterNames;
}
}
/**
* Internal method which takes care of the job of adding
* LogFilter mappings but doesn't perform any of the checks
* performed by the public method for adding mappings.
*/
private void addLogFilterInternal(String name, LogFilter filter) {
filters.put(name, filter);
}
}
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