/*
* Copyright 2013 Cloudera Inc.
*
* 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
*
* 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 com.cloudera.cdk.morphline.stdlib;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import org.slf4j.LoggerFactory;
import org.slf4j.helpers.BasicMarkerFactory;
import com.cloudera.cdk.morphline.api.Command;
import com.cloudera.cdk.morphline.api.CommandBuilder;
import com.cloudera.cdk.morphline.api.MorphlineContext;
import com.cloudera.cdk.morphline.api.Record;
import com.cloudera.cdk.morphline.base.AbstractCommand;
import com.cloudera.cdk.morphline.base.Notifications;
import com.codahale.metrics.MetricFilter;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.Slf4jReporter;
import com.codahale.metrics.Slf4jReporter.Builder;
import com.typesafe.config.Config;
/**
* Command that starts periodically logging the metrics of the
* {@code com.codahale.metrics.MetricRegistry} of the
* morphline context to SLF4j, configured via a
* {@code com.codahale.metrics.Slf4jReporter.Builder}.
*/
public final class StartReportingMetricsToSLF4JBuilder implements CommandBuilder {
@Override
public Collection<String> getNames() {
return Collections.singletonList("startReportingMetricsToSLF4J");
}
@Override
public Command build(Config config, Command parent, Command child, MorphlineContext context) {
return new StartReportingMetricsToSLF4J(this, config, parent, child, context);
}
///////////////////////////////////////////////////////////////////////////////
// Nested classes:
///////////////////////////////////////////////////////////////////////////////
private static final class StartReportingMetricsToSLF4J extends AbstractCommand {
private final String logger;
private static final Map<MetricRegistry, Map<String, Slf4jReporter>> REGISTRIES = new IdentityHashMap();
public StartReportingMetricsToSLF4J(CommandBuilder builder, Config config, Command parent, Command child, MorphlineContext context) {
super(builder, config, parent, child, context);
MetricFilter filter = PatternMetricFilter.parse(getConfigs(), config);
TimeUnit defaultDurationUnit = getConfigs().getTimeUnit(config, "defaultDurationUnit", TimeUnit.MILLISECONDS);
TimeUnit defaultRateUnit = getConfigs().getTimeUnit(config, "defaultRateUnit", TimeUnit.SECONDS);
long frequency = getConfigs().getNanoseconds(config, "frequency", 10 * 1000L * 1000 * 1000); // 10 secs, also see https://github.com/typesafehub/config/blob/master/HOCON.md#duration-format
this.logger = getConfigs().getString(config, "logger", "metrics");
String marker = getConfigs().getString(config, "marker", null);
validateArguments();
MetricRegistry registry = context.getMetricRegistry();
synchronized (REGISTRIES) {
Map<String, Slf4jReporter> reporters = REGISTRIES.get(registry);
if (reporters == null) {
reporters = new HashMap();
REGISTRIES.put(registry, reporters);
}
Slf4jReporter reporter = reporters.get(logger);
if (reporter == null) {
Builder reporterBuilder = Slf4jReporter.forRegistry(registry)
.filter(filter)
.convertDurationsTo(defaultDurationUnit)
.convertRatesTo(defaultRateUnit)
.outputTo(LoggerFactory.getLogger(logger));
if (marker != null) {
reporterBuilder = reporterBuilder.markWith(new BasicMarkerFactory().getMarker(marker));
}
reporter = reporterBuilder.build();
reporter.start(frequency, TimeUnit.NANOSECONDS);
reporters.put(logger, reporter);
}
}
}
@Override
protected void doNotify(Record notification) {
for (Object event : Notifications.getLifecycleEvents(notification)) {
if (event == Notifications.LifecycleEvent.SHUTDOWN) {
synchronized (REGISTRIES) {
Map<String, Slf4jReporter> reporters = REGISTRIES.get(getContext().getMetricRegistry());
if (reporters != null) {
Slf4jReporter reporter = reporters.remove(logger);
if (reporter != null) {
reporter.stop();
}
}
}
}
}
super.doNotify(notification);
}
}
}