/*
* Copyright 2010-2014 Ning, Inc.
*
* Ning 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.killbill.commons.skeleton.metrics;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.Timer;
import com.google.common.base.Joiner;
public class ResourceTimer {
private static final Joiner METRIC_NAME_JOINER = Joiner.on('.');
private final String resourcePath;
private final String name;
private final String httpMethod;
private final Map<String, Object> tags;
private final MetricRegistry registry;
public ResourceTimer(final String resourcePath, final String name, final String httpMethod, final Map<String, Object> tags, final MetricRegistry registry) {
this.resourcePath = resourcePath;
this.name = name;
this.httpMethod = httpMethod;
this.tags = tags;
this.registry = registry;
}
public void update(final int responseStatus, final long duration, final TimeUnit unit) {
final String metricName;
if (tags != null && !tags.isEmpty()) {
final String tags = METRIC_NAME_JOINER.join(getTagsValues());
metricName = METRIC_NAME_JOINER.join(
escapeMetrics("kb_resource", resourcePath, name, httpMethod, tags, responseStatusGroup(responseStatus), responseStatus));
} else {
metricName = METRIC_NAME_JOINER.join(
escapeMetrics("kb_resource", resourcePath, name, httpMethod, responseStatusGroup(responseStatus), responseStatus));
}
// Letting metric registry deal with unique metric creation
final Timer timer = registry.timer(metricName);
timer.update(duration, unit);
}
private List<String> escapeMetrics(final Object... names) {
final List<String> result = new ArrayList<String>(names.length);
for (final Object name : names) {
final String metricName = String.valueOf(name);
result.add(metricName.replaceAll("\\.", "_"));
}
return result;
}
private List<Object> getTagsValues() {
final List<Object> values = new ArrayList<Object>(tags.values().size());
for (final Object value : tags.values()) {
if (value != null) {
values.add(value);
} else {
values.add("null");
}
}
return values;
}
private String responseStatusGroup(final int responseStatus) {
return String.format("%sxx", responseStatus / 100);
}
}