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org.apache.sling.tracer.internal.TracerSet Maven / Gradle / Ivy
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Tracer provides support for enabling the logs for specific category at specific level and
only for specific request. It provides a very fine level of control via config provided
as part of HTTP request around how the logging should be performed for given category.
Refer to http://sling.apache.org/documentation/bundles/log-tracers.html
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.sling.tracer.internal;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import ch.qos.logback.classic.Level;
import org.apache.sling.commons.osgi.ManifestHeader;
class TracerSet {
public static final String LEVEL = "level";
public static final String CALLER = "caller";
public static final String CALLER_PREFIX_FILTER = "caller-exclude-filter";
private final String name;
private final List configs;
public TracerSet(String config) {
int indexOfColon = config.indexOf(':');
if (indexOfColon == -1) {
throw new IllegalArgumentException("Invalid tracer config format. TracerSet " +
"name cannot be determined " + config);
}
name = config.substring(0, indexOfColon).toLowerCase().trim();
configs = parseTracerConfigs(config.substring(indexOfColon + 1));
}
public TracerSet(String name, String config) {
this.name = name;
this.configs = parseTracerConfigs(config);
}
public TracerConfig getConfig(String category) {
for (TracerConfig tc : configs) {
if (tc.match(category)) {
return tc;
}
}
return null;
}
public List getConfigs() {
return configs;
}
public String getName() {
return name;
}
private static List parseTracerConfigs(String config) {
ManifestHeader parsedConfig = ManifestHeader.parse(config);
List result = new ArrayList(parsedConfig.getEntries().length);
for (ManifestHeader.Entry e : parsedConfig.getEntries()) {
String category = e.getValue();
//Defaults to Debug
Level level = Level.valueOf(e.getAttributeValue(LEVEL));
CallerStackReporter reporter = createReporter(e);
result.add(new TracerConfig(category, level, reporter));
}
return Collections.unmodifiableList(result);
}
static CallerStackReporter createReporter(ManifestHeader.Entry e) {
String caller = e.getAttributeValue(CALLER);
if (caller == null){
return null;
}
if ("true".equals(caller)){
return new CallerStackReporter(0, Integer.MAX_VALUE, CallerFilter.ALL);
}
CallerFilter filter = CallerFilter.ALL;
int depth;
try{
depth = Integer.parseInt(caller);
} catch (NumberFormatException ignore){
return null;
}
String filterValue = e.getAttributeValue(CALLER_PREFIX_FILTER);
if (filterValue != null){
filter = PrefixExcludeFilter.from(filterValue);
}
return new CallerStackReporter(0, depth, filter);
}
}