com.yammer.metrics.core.MetricName Maven / Gradle / Ivy
package com.yammer.metrics.core;
import javax.management.ObjectName;
import java.lang.reflect.Method;
/**
* A value class encapsulating a metric's owning class and name.
*/
public class MetricName implements Comparable {
private final String group;
private final String type;
private final String name;
private final String scope;
private final String mBeanName;
/**
* Creates a new {@link MetricName} without a scope.
*
* @param klass the {@link Class} to which the {@link Metric} belongs
* @param name the name of the {@link Metric}
*/
public MetricName(Class klass, String name) {
this(klass, name, null);
}
/**
* Creates a new {@link MetricName} without a scope.
*
* @param group the group to which the {@link Metric} belongs
* @param type the type to which the {@link Metric} belongs
* @param name the name of the {@link Metric}
*/
public MetricName(String group, String type, String name) {
this(group, type, name, null);
}
/**
* Creates a new {@link MetricName} without a scope.
*
* @param klass the {@link Class} to which the {@link Metric} belongs
* @param name the name of the {@link Metric}
* @param scope the scope of the {@link Metric}
*/
public MetricName(Class klass, String name, String scope) {
this(klass.getPackage() == null ? "" : klass.getPackage().getName(),
klass.getSimpleName().replaceAll("\\$$", ""),
name,
scope);
}
/**
* Creates a new {@link MetricName} without a scope.
*
* @param group the group to which the {@link Metric} belongs
* @param type the type to which the {@link Metric} belongs
* @param name the name of the {@link Metric}
* @param scope the scope of the {@link Metric}
*/
public MetricName(String group, String type, String name, String scope) {
this(group, type, name, scope, createMBeanName(group, type, name, scope));
}
/**
* Creates a new {@link MetricName} without a scope.
*
* @param group the group to which the {@link Metric} belongs
* @param type the type to which the {@link Metric} belongs
* @param name the name of the {@link Metric}
* @param scope the scope of the {@link Metric}
* @param mBeanName the 'ObjectName', represented as a string, to use when registering the
* MBean.
*/
public MetricName(String group, String type, String name, String scope, String mBeanName) {
if (group == null || type == null) {
throw new IllegalArgumentException("Both group and type need to be specified");
}
if (name == null) {
throw new IllegalArgumentException("Name needs to be specified");
}
this.group = group;
this.type = type;
this.name = name;
this.scope = scope;
this.mBeanName = mBeanName;
}
/**
* Returns the group to which the {@link Metric} belongs. For class-based metrics, this will be
* the package name of the {@link Class} to which the {@link Metric} belongs.
*
* @return the group to which the {@link Metric} belongs
*/
public String getGroup() {
return group;
}
/**
* Returns the type to which the {@link Metric} belongs. For class-based metrics, this will be
* the simple class name of the {@link Class} to which the {@link Metric} belongs.
*
* @return the type to which the {@link Metric} belongs
*/
public String getType() {
return type;
}
/**
* Returns the name of the {@link Metric}.
*
* @return the name of the {@link Metric}
*/
public String getName() {
return name;
}
/**
* Returns the scope of the {@link Metric}.
*
* @return the scope of the {@link Metric}
*/
public String getScope() {
return scope;
}
/**
* Returns {@code true} if the {@link Metric} has a scope, {@code false} otherwise.
*
* @return {@code true} if the {@link Metric} has a scope
*/
public boolean hasScope() {
return scope != null;
}
/**
* Returns the MBean name for the {@link Metric} identified by this metric name.
*
* @return the MBean name
*/
public String getMBeanName() {
return mBeanName;
}
@Override
public boolean equals(Object o) {
if (this == o) { return true; }
if (o == null || getClass() != o.getClass()) { return false; }
final MetricName that = (MetricName) o;
return mBeanName.equals(that.mBeanName);
}
@Override
public int hashCode() {
return mBeanName.hashCode();
}
@Override
public String toString() {
return mBeanName;
}
@Override
public int compareTo(MetricName o) {
return mBeanName.compareTo(o.mBeanName);
}
private static String createMBeanName(String group, String type, String name, String scope) {
final StringBuilder nameBuilder = new StringBuilder();
nameBuilder.append(ObjectName.quote(group));
nameBuilder.append(":type=");
nameBuilder.append(ObjectName.quote(type));
if (scope != null) {
nameBuilder.append(",scope=");
nameBuilder.append(ObjectName.quote(scope));
}
if (name.length() > 0) {
nameBuilder.append(",name=");
nameBuilder.append(ObjectName.quote(name));
}
return nameBuilder.toString();
}
/**
* If the group is empty, use the package name of the given class. Otherwise use group
* @param group The group to use by default
* @param klass The class being tracked
* @return a group for the metric
*/
public static String chooseGroup(String group, Class klass) {
if(group == null || group.isEmpty()) {
group = klass.getPackage() == null ? "" : klass.getPackage().getName();
}
return group;
}
/**
* If the type is empty, use the simple name of the given class. Otherwise use type
* @param type The type to use by default
* @param klass The class being tracked
* @return a type for the metric
*/
public static String chooseType(String type, Class klass) {
if(type == null || type.isEmpty()) {
type = klass.getSimpleName().replaceAll("\\$$", "");
}
return type;
}
/**
* If name is empty, use the name of the given method. Otherwise use name
* @param name The name to use by default
* @param method The method being tracked
* @return a name for the metric
*/
public static String chooseName(String name, Method method) {
if(name == null || name.isEmpty()) {
name = method.getName();
}
return name;
}
}
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