/**
* 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 com.codahale.metrics.MetricRegistry;
import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.impl.DefaultProducer;
import org.apache.camel.util.ObjectHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public abstract class AbstractMetricsProducer<T extends AbstractMetricsEndpoint> extends DefaultProducer {
public static final String HEADER_PATTERN = MetricsConstants.HEADER_PERFIX + "*";
private static final Logger LOG = LoggerFactory.getLogger(AbstractMetricsProducer.class);
public AbstractMetricsProducer(T endpoint) {
super(endpoint);
}
@Override
public void process(Exchange exchange) throws Exception {
@SuppressWarnings("unchecked")
T endpoint = (T) getEndpoint();
Message in = exchange.getIn();
String defaultMetricsName = endpoint.getMetricsName();
String finalMetricsName = getMetricsName(in, defaultMetricsName);
MetricRegistry registry = endpoint.getRegistry();
try {
doProcess(exchange, endpoint, registry, finalMetricsName);
} catch (Exception e) {
LOG.warn("Failed to produce metrics for {} in {} - {}", new Object[] {
finalMetricsName, getClass().getSimpleName(), e.getMessage() });
}
clearMetricsHeaders(in);
}
protected abstract void doProcess(Exchange exchange, T endpoint, MetricRegistry registry, String metricsName) throws Exception;
public String getMetricsName(Message in, String defaultValue) {
return getStringHeader(in, MetricsConstants.HEADER_METRIC_NAME, defaultValue);
}
public String getStringHeader(Message in, String header, String defaultValue) {
String headerValue = in.getHeader(header, String.class);
return ObjectHelper.isNotEmpty(headerValue) ? headerValue : defaultValue;
}
public Long getLongHeader(Message in, String header, Long defaultValue) {
return in.getHeader(header, defaultValue, Long.class);
}
protected boolean clearMetricsHeaders(Message in) {
return in.removeHeaders(HEADER_PATTERN);
}
}