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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.statistics;
import com.yahoo.log.event.Event;
import com.yahoo.statistics.Value.Parameters;
import java.util.Iterator;
import java.util.Map;
import java.util.HashMap;
/**
* A set of related values which should be logged together.
*
* @author <a href="mailto:steinar@yahoo-inc.com">Steinar Knutsen</a>
*/
public class ValueGroup extends Group {
// A map for names of subevents and Value instances
private Map<String, Value> subEvents = new HashMap<>();
/**
* Create a ValueGroup.
*
* @param name
* The symbolic name of this group of values
* @param manager
* the statistics manager acquired by injection
*/
public ValueGroup(String name, Statistics manager) {
this(name, manager, null);
}
/**
* Create a ValueGroup.
*
* @param name
* The symbolic name of this group of values
* @param manager
* the statistics manager acquired by injection
* @param callback
* will be invoked each time data is written to the log
*/
public ValueGroup(String name, Statistics manager, Callback callback) {
super(name, manager, callback);
manager.register(this);
}
/**
* Put a value into the named value in the group.
*/
public void put(String name, double x) {
Value v = getValue(name);
v.put(x);
}
/**
* Get a value with a given name, creates a new value if no
* value with the name given exists.
*
*/
synchronized Value getValue(String name) {
Value v = subEvents.get(name);
if (v == null) {
v = getNewValue(name);
}
return v;
}
private Value getNewValue(String subName) {
Value v = Value.initializeUnregisteredValue(subName, new Parameters().setLogRaw(true));
subEvents.put(subName, v);
return v;
}
/**
* Dump state to log and reset.
*/
@Override
public void runHandle() {
StringBuilder multi = new StringBuilder();
ValueProxy[] proxies;
int i = 0;
synchronized (this) {
proxies = new ValueProxy[subEvents.size()];
i = 0;
for (Iterator<Value> j = subEvents.values().iterator(); j.hasNext();) {
Value v = j.next();
proxies[i] = v.getProxyAndReset();
i++;
}
}
while (i > 0) {
i--;
if (multi.length() > 0) {
multi.append(", ");
}
multi.append(proxies[i].getName());
multi.append("=");
multi.append(proxies[i].getRaw());
}
Event.valueGroup(getName(), multi.toString());
}
@Override
public boolean equals(Object o) {
if (o.getClass() != this.getClass()) {
return false;
}
ValueGroup other = (ValueGroup) o;
return getName().equals(other.getName());
}
@Override
public int hashCode() {
return getName().hashCode() + 31 * "ValueGroup".hashCode();
}
}
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