/**
* 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.camel.component.metrics;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.Slf4jReporter;
import org.apache.camel.Endpoint;
import org.apache.camel.RuntimeCamelException;
import org.apache.camel.component.metrics.counter.CounterEndpoint;
import org.apache.camel.component.metrics.histogram.HistogramEndpoint;
import org.apache.camel.component.metrics.meter.MeterEndpoint;
import org.apache.camel.component.metrics.timer.TimerEndpoint;
import org.apache.camel.impl.DefaultComponent;
import org.apache.camel.spi.Registry;
import org.apache.camel.util.ObjectHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Represents the component that manages metrics endpoints.
*/
public class MetricsComponent extends DefaultComponent {
public static final String METRIC_REGISTRY_NAME = "metricRegistry";
public static final MetricsType DEFAULT_METRICS_TYPE = MetricsType.METER;
public static final long DEFAULT_REPORTING_INTERVAL_SECONDS = 60L;
private static final Logger LOG = LoggerFactory.getLogger(MetricsComponent.class);
private MetricRegistry metricRegistry;
@Override
protected Endpoint createEndpoint(String uri, String remaining, Map<String, Object> parameters) throws Exception {
if (metricRegistry == null) {
Registry camelRegistry = getCamelContext().getRegistry();
metricRegistry = getOrCreateMetricRegistry(camelRegistry, METRIC_REGISTRY_NAME);
}
String metricsName = getMetricsName(remaining);
MetricsType metricsType = getMetricsType(remaining);
LOG.info("Metrics type: {}; name: {}", metricsType, metricsName);
Endpoint endpoint = createNewEndpoint(metricRegistry, metricsType, metricsName);
setProperties(endpoint, parameters);
return endpoint;
}
String getMetricsName(String remaining) {
String name = ObjectHelper.after(remaining, ":");
return name == null ? remaining : name;
}
Endpoint createNewEndpoint(MetricRegistry registry, MetricsType type, String metricsName) {
Endpoint endpoint;
switch (type) {
case COUNTER:
endpoint = new CounterEndpoint(registry, metricsName);
break;
case METER:
endpoint = new MeterEndpoint(registry, metricsName);
break;
case HISTOGRAM:
endpoint = new HistogramEndpoint(registry, metricsName);
break;
case TIMER:
endpoint = new TimerEndpoint(registry, metricsName);
break;
default:
throw new RuntimeCamelException("Metrics type \"" + type.toString() + "\" not supported");
}
return endpoint;
}
MetricsType getMetricsType(String remaining) {
String name = ObjectHelper.before(remaining, ":");
MetricsType type;
if (name == null) {
type = DEFAULT_METRICS_TYPE;
} else {
type = MetricsType.getByName(name);
}
if (type == null) {
throw new RuntimeCamelException("Unknown metrics type \"" + name + "\"");
}
return type;
}
MetricRegistry getOrCreateMetricRegistry(Registry camelRegistry, String registryName) {
LOG.debug("Looking up MetricRegistry from Camel Registry for name \"{}\"", registryName);
MetricRegistry result = getMetricRegistryFromCamelRegistry(camelRegistry, registryName);
if (result == null) {
LOG.debug("MetricRegistry not found from Camel Registry for name \"{}\"", registryName);
LOG.info("Creating new default MetricRegistry");
result = createMetricRegistry();
}
return result;
}
MetricRegistry getMetricRegistryFromCamelRegistry(Registry camelRegistry, String registryName) {
return camelRegistry.lookupByNameAndType(registryName, MetricRegistry.class);
}
MetricRegistry createMetricRegistry() {
MetricRegistry registry = new MetricRegistry();
final Slf4jReporter reporter = Slf4jReporter.forRegistry(registry)
.outputTo(LOG)
.convertRatesTo(TimeUnit.SECONDS)
.convertDurationsTo(TimeUnit.MILLISECONDS)
.build();
reporter.start(DEFAULT_REPORTING_INTERVAL_SECONDS, TimeUnit.SECONDS);
return registry;
}
}