org.apache.kafka.common.MetricName Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of kafka-clients Show documentation
Show all versions of kafka-clients Show documentation
Kafka client whose producer requires explicit encoders.
The newest version!
/**
* 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.kafka.common;
import java.util.HashMap;
import java.util.Map;
import org.apache.kafka.common.utils.Utils;
/**
* The MetricName class encapsulates a metric's name, logical group and its related attributes
*
* This class captures the following parameters
*
* name The name of the metric
* group logical group name of the metrics to which this metric belongs.
* description A human-readable description to include in the metric. This is optional.
* tags additional key/value attributes of the metric. This is optional.
*
* group, tags parameters can be used to create unique metric names while reporting in JMX or any custom reporting.
*
* Ex: standard JMX MBean can be constructed like domainName:type=group,key1=val1,key2=val2
*
* Usage looks something like this:
*
{@code
* // set up metrics:
* Metrics metrics = new Metrics(); // this is the global repository of metrics and sensors
* Sensor sensor = metrics.sensor("message-sizes");
*
* Map metricTags = new LinkedHashMap();
* metricTags.put("client-id", "producer-1");
* metricTags.put("topic", "topic");
*
* MetricName metricName = new MetricName("message-size-avg", "producer-metrics", "average message size", metricTags);
* sensor.add(metricName, new Avg());
*
* metricName = new MetricName("message-size-max", "producer-metrics", metricTags);
* sensor.add(metricName, new Max());
*
* metricName = new MetricName("message-size-min", "producer-metrics", "message minimum size", "client-id", "my-client", "topic", "my-topic");
* sensor.add(metricName, new Min());
*
* // as messages are sent we record the sizes
* sensor.record(messageSize);
* }
*/
public final class MetricName {
private final String name;
private final String group;
private final String description;
private Map tags;
private int hash = 0;
/**
* @param name The name of the metric
* @param group logical group name of the metrics to which this metric belongs
* @param description A human-readable description to include in the metric
* @param tags additional key/value attributes of the metric
*/
public MetricName(String name, String group, String description, Map tags) {
this.name = Utils.notNull(name);
this.group = Utils.notNull(group);
this.description = Utils.notNull(description);
this.tags = Utils.notNull(tags);
}
/**
* @param name The name of the metric
* @param group logical group name of the metrics to which this metric belongs
* @param description A human-readable description to include in the metric
* @param keyValue additional key/value attributes of the metric (must come in pairs)
*/
public MetricName(String name, String group, String description, String... keyValue) {
this(name, group, description, getTags(keyValue));
}
private static Map getTags(String... keyValue) {
if ((keyValue.length % 2) != 0)
throw new IllegalArgumentException("keyValue needs to be specified in paris");
Map tags = new HashMap();
for (int i=0; i<(keyValue.length / 2); i++)
tags.put(keyValue[i], keyValue[i+1]);
return tags;
}
/**
* @param name The name of the metric
* @param group logical group name of the metrics to which this metric belongs
* @param tags key/value attributes of the metric
*/
public MetricName(String name, String group, Map tags) {
this(name, group, "", tags);
}
/**
* @param name The name of the metric
* @param group logical group name of the metrics to which this metric belongs
* @param description A human-readable description to include in the metric
*/
public MetricName(String name, String group, String description) {
this(name, group, description, new HashMap());
}
/**
* @param name The name of the metric
* @param group logical group name of the metrics to which this metric belongs
*/
public MetricName(String name, String group) {
this(name, group, "", new HashMap());
}
public String name() {
return this.name;
}
public String group() {
return this.group;
}
public Map tags() {
return this.tags;
}
public String description() {
return this.description;
}
@Override
public int hashCode() {
if (hash != 0)
return hash;
final int prime = 31;
int result = 1;
result = prime * result + ((group == null) ? 0 : group.hashCode());
result = prime * result + ((name == null) ? 0 : name.hashCode());
result = prime * result + ((tags == null) ? 0 : tags.hashCode());
this.hash = result;
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
MetricName other = (MetricName) obj;
if (group == null) {
if (other.group != null)
return false;
} else if (!group.equals(other.group))
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
if (tags == null) {
if (other.tags != null)
return false;
} else if (!tags.equals(other.tags))
return false;
return true;
}
@Override
public String toString() {
return "MetricName [name=" + name + ", group=" + group + ", description="
+ description + ", tags=" + tags + "]";
}
}