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/*
* Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance
* with the License. A copy of the License is located at
*
* http://aws.amazon.com/apache2.0/
*
* or in the "license" file accompanying this file. This file 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 ai.djl.metric;
import com.google.gson.annotations.SerializedName;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* A class representing a single recorded {@code Metric} value.
*
* @see Metrics
*/
public class Metric {
private static final Pattern PATTERN =
Pattern.compile(
"\\s*([\\w\\s]+)\\.([\\w\\s]+):([0-9\\-,.e]+)(?>\\|#([^|]*))?(?>\\|(\\d+))?");
private static final Dimension HOST = new Dimension("Host", getLocalHostName());
@SerializedName("MetricName")
private String metricName;
@SerializedName("Value")
private String value;
@SerializedName("Unit")
private String unit;
@SerializedName("Dimensions")
private Dimension[] dimensions;
@SerializedName("Timestamp")
private String timestamp;
/**
* Constructs a {@code Metric} instance with the specified {@code metricName} and
* value.
*
* @param metricName the metric name
* @param value the metric value
*/
public Metric(String metricName, Number value) {
this(metricName, value, Unit.COUNT);
}
/**
* Constructs a {@code Metric} instance with the specified {@code metricName}, value
* , and {@code unit}.
*
* @param metricName the metric name
* @param value the metric value
* @param unit the metric unit
*/
public Metric(String metricName, Number value, Unit unit) {
this(metricName, value.toString(), unit.getValue(), null, HOST);
}
/**
* Constructs a {@code Metric} instance with the specified {@code metricName}, value
* , and {@code unit}.
*
* @param metricName the metric name
* @param value the metric value
* @param unit the metric unit
* @param dimensions the metric dimensions
*/
public Metric(String metricName, Number value, Unit unit, Dimension... dimensions) {
this(metricName, value.toString(), unit.getValue(), null, dimensions);
}
/**
* Constructs a new {@code Metric} instance.
*
* @param metricName the metric name
* @param value the metric value
* @param unit the metric unit
* @param timestamp the metric timestamp
* @param dimensions the metric dimensions
*/
private Metric(
String metricName,
String value,
String unit,
String timestamp,
Dimension... dimensions) {
this.metricName = metricName;
this.unit = unit;
this.value = value;
this.timestamp = timestamp;
this.dimensions = dimensions;
}
/**
* Returns the name of the {@code Metric}.
*
* @return the metric name
*/
public String getMetricName() {
return metricName;
}
/**
* Returns the int value of the {@code Metric}.
*
* @return the metric value in int
*/
public Double getValue() {
return Double.valueOf(value);
}
/**
* Returns the unit of the {@code Metric}.
*
* @return the metric unit
*/
public Unit getUnit() {
return Unit.fromValue(unit);
}
/**
* Returns the timestamp of the {@code Metric}.
*
* @return the metric timestamp
*/
public String getTimestamp() {
return timestamp;
}
/**
* Returns the metric dimensions.
*
* @return the metric dimensions
*/
public Dimension[] getDimensions() {
return dimensions;
}
/**
* Returns a {@code Metric} instance parsed from the log string.
*
* @param line the input string
* @return a {@code Metric} object
*/
public static Metric parse(String line) {
// DiskAvailable.Gigabytes:311|#Host:localhost|1650953744320
Matcher matcher = PATTERN.matcher(line);
if (!matcher.matches()) {
return null;
}
String metricName = matcher.group(1);
String unit = matcher.group(2);
String value = matcher.group(3);
String dimension = matcher.group(4);
String timestamp = matcher.group(5);
Dimension[] dimensions = null;
if (dimension != null) {
String[] dims = dimension.split(",");
dimensions = new Dimension[dims.length];
int index = 0;
for (String dim : dims) {
String[] pair = dim.split(":");
if (pair.length == 2) {
dimensions[index++] = new Dimension(pair[0], pair[1]);
}
}
}
return new Metric(metricName, value, unit, timestamp, dimensions);
}
/** {@inheritDoc} */
@Override
public String toString() {
StringBuilder sb = new StringBuilder(128);
sb.append(metricName).append('.').append(unit).append(':').append(value);
if (dimensions != null) {
boolean first = true;
for (Dimension dimension : dimensions) {
if (dimension == null) {
continue;
}
if (first) {
sb.append("|#");
first = false;
} else {
sb.append(',');
}
sb.append(dimension.getName()).append(':').append(dimension.getValue());
}
}
if (timestamp != null) {
sb.append('|').append(timestamp);
}
return sb.toString();
}
private static String getLocalHostName() {
try {
return InetAddress.getLocalHost().getHostName();
} catch (UnknownHostException e) {
return "Unknown";
}
}
}
