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Log4j2Metrics.java
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Log4j2Metrics.java
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/**
* Copyright 2017 VMware, Inc.
* <p>
* Licensed 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
* <p>
* https://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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 io.micrometer.core.instrument.binder.logging;
import io.micrometer.core.instrument.Counter;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Tag;
import io.micrometer.core.instrument.binder.BaseUnits;
import io.micrometer.core.instrument.binder.MeterBinder;
import io.micrometer.core.lang.NonNullApi;
import io.micrometer.core.lang.NonNullFields;
import io.micrometer.core.lang.Nullable;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.core.Filter;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.LoggerContext;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.Configurator;
import org.apache.logging.log4j.core.config.LoggerConfig;
import org.apache.logging.log4j.core.filter.AbstractFilter;
import org.apache.logging.log4j.core.filter.CompositeFilter;
import java.util.Arrays;
import static java.util.Collections.emptyList;
/**
* {@link MeterBinder} for Apache Log4j 2.
*
* @author Steven Sheehy
* @author Johnny Lim
* @since 1.1.0
*/
@NonNullApi
@NonNullFields
public class Log4j2Metrics implements MeterBinder, AutoCloseable {
private static final String METER_NAME = "log4j2.events";
private final Iterable<Tag> tags;
private final LoggerContext loggerContext;
@Nullable
private MetricsFilter metricsFilter;
public Log4j2Metrics() {
this(emptyList());
}
public Log4j2Metrics(Iterable<Tag> tags) {
this(tags, (LoggerContext) LogManager.getContext(false));
}
public Log4j2Metrics(Iterable<Tag> tags, LoggerContext loggerContext) {
this.tags = tags;
this.loggerContext = loggerContext;
}
@Override
public void bindTo(MeterRegistry registry) {
metricsFilter = new MetricsFilter(registry, tags);
metricsFilter.start();
Configuration configuration = loggerContext.getConfiguration();
LoggerConfig rootLoggerConfig = configuration.getRootLogger();
rootLoggerConfig.addFilter(metricsFilter);
loggerContext.getConfiguration().getLoggers().values().stream()
.filter(loggerConfig -> !loggerConfig.isAdditive())
.forEach(loggerConfig -> {
if (loggerConfig == rootLoggerConfig) {
return;
}
Filter logFilter = loggerConfig.getFilter();
if ((logFilter instanceof CompositeFilter && Arrays.stream(((CompositeFilter) logFilter).getFiltersArray())
.anyMatch(innerFilter -> innerFilter instanceof MetricsFilter))) {
return;
}
if (logFilter instanceof MetricsFilter) {
return;
}
loggerConfig.addFilter(metricsFilter);
});
loggerContext.updateLoggers(configuration);
Configurator.reconfigure(configuration);
}
@Override
public void close() {
if (metricsFilter != null) {
Configuration configuration = loggerContext.getConfiguration();
LoggerConfig rootLoggerConfig = configuration.getRootLogger();
rootLoggerConfig.removeFilter(metricsFilter);
loggerContext.getConfiguration().getLoggers().values().stream()
.filter(loggerConfig -> !loggerConfig.isAdditive())
.forEach(loggerConfig -> {
if (loggerConfig != rootLoggerConfig) {
loggerConfig.removeFilter(metricsFilter);
}
});
loggerContext.updateLoggers(configuration);
metricsFilter.stop();
}
}
@NonNullApi
@NonNullFields
class MetricsFilter extends AbstractFilter {
private final Counter fatalCounter;
private final Counter errorCounter;
private final Counter warnCounter;
private final Counter infoCounter;
private final Counter debugCounter;
private final Counter traceCounter;
MetricsFilter(MeterRegistry registry, Iterable<Tag> tags) {
fatalCounter = Counter.builder(METER_NAME)
.tags(tags)
.tags("level", "fatal")
.description("Number of fatal level log events")
.baseUnit(BaseUnits.EVENTS)
.register(registry);
errorCounter = Counter.builder(METER_NAME)
.tags(tags)
.tags("level", "error")
.description("Number of error level log events")
.baseUnit(BaseUnits.EVENTS)
.register(registry);
warnCounter = Counter.builder(METER_NAME)
.tags(tags)
.tags("level", "warn")
.description("Number of warn level log events")
.baseUnit(BaseUnits.EVENTS)
.register(registry);
infoCounter = Counter.builder(METER_NAME)
.tags(tags)
.tags("level", "info")
.description("Number of info level log events")
.baseUnit(BaseUnits.EVENTS)
.register(registry);
debugCounter = Counter.builder(METER_NAME)
.tags(tags)
.tags("level", "debug")
.description("Number of debug level log events")
.baseUnit(BaseUnits.EVENTS)
.register(registry);
traceCounter = Counter.builder(METER_NAME)
.tags(tags)
.tags("level", "trace")
.description("Number of trace level log events")
.baseUnit(BaseUnits.EVENTS)
.register(registry);
}
@Override
public Result filter(LogEvent event) {
incrementCounter(event);
return Result.NEUTRAL;
}
private void incrementCounter(LogEvent event) {
switch (event.getLevel().getStandardLevel()) {
case FATAL:
fatalCounter.increment();
break;
case ERROR:
errorCounter.increment();
break;
case WARN:
warnCounter.increment();
break;
case INFO:
infoCounter.increment();
break;
case DEBUG:
debugCounter.increment();
break;
case TRACE:
traceCounter.increment();
break;
default:
break;
}
}
}
}