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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.statistics;
import java.util.concurrent.atomic.AtomicLong;
import com.yahoo.log.event.Event;
import com.yahoo.container.StatisticsConfig;
/**
* A single integer value which can be incremented.
*
* @author Steinar Knutsen
*/
public class Counter extends Handle {
// The current value of this counter
private AtomicLong current = new AtomicLong(0L);
// Whether or not this counter shall be reset between each logging
// interval
private final boolean resetCounter;
/**
* A monotonically increasing 64 bit integer value.
*
* @param name
* The name of this counter, for use in logging.
* @param manager
* the statistics manager acquired by injection
* @param fetchParametersFromConfig
* Whether or not this counter should be initialized from config.
*/
public Counter(String name, Statistics manager, boolean fetchParametersFromConfig) {
this(name, manager, fetchParametersFromConfig, null, false, true);
}
/**
* A monotonically increasing 64 bit integer value.
*
* @param name
* The name of this counter, for use in logging.
* @param manager
* the statistics manager acquired by injection
* @param fetchParametersFromConfig
* Whether or not this counter should be initialized from config.
* @param callback
* will be invoked each time this counter is written to the log
* @param resetCounter
* Control for if this Counter should be reset between each
* logging interval.
*/
public Counter(String name, Statistics manager,
boolean fetchParametersFromConfig, Callback callback, boolean resetCounter) {
this(name, manager, fetchParametersFromConfig, callback,
resetCounter, true);
}
/**
* A monotonically increasing 64 bit integer value. Do not make this
* constructor public, it is used for creating unregistered counters.
*
* @param name
* The name of this counter, for use in logging.
* @param manager
* the statistics manager acquired by injection
* @param fetchParametersFromConfig
* Whether or not this counter should be initialized from config.
* @param callback
* will be invoked each time this counter is written to the log
* @param resetCounter
* Control for if this Counter should be reset between each
* logging interval.
* @param register
* Whether to register the counter in the statistics manager
*/
private Counter(String name, Statistics manager,
boolean fetchParametersFromConfig, Callback callback,
boolean resetCounter, boolean register) {
super(name, manager, callback);
if (fetchParametersFromConfig) {
StatisticsConfig config = manager.getConfig();
this.resetCounter = getResetCounter(name, config);
} else {
this.resetCounter = resetCounter;
}
if (register) {
manager.register(this);
}
}
/**
* Get a Counter instance not registered in the statistics manager. This is
* used by CounterGroup and should not be made public.
*
* @param name
* The name of this counter, for use in logging.
* @param resetCounter
* Control for if this Counter should be reset between each
* logging interval.
*/
static Counter intializeUnregisteredCounter(String name,
boolean resetCounter) {
return new Counter(name, null, false, null, resetCounter, false);
}
/**
* If this Counter is set up to read config, configure it
* according to the config given.
*/
private static boolean getResetCounter(String name, StatisticsConfig config) {
for (int i = 0; i < config.counterresets().size(); i++) {
String configName = config.counterresets(i).name();
if (configName.equals(name)) {
return true;
}
}
return false;
}
/**
* Increment by 1.
*/
public void increment() {
current.incrementAndGet();
}
/**
* Increment by n.
*/
public void increment(long n) {
current.addAndGet(n);
}
/**
* @return current value of this counter
*/
public long get() {
return current.get();
}
/**
* The reset counter is true if this is counter is reset to 0 between each
* logging interval.
*
* @return whether this counter is reset between each logging interval.
*/
public boolean getResetCounter() {
return resetCounter;
}
/**
* If this counter should be set to 0 between each logging interval,
* do that.
*/
public void reset() {
if (resetCounter) {
current.set(0L);
}
}
/**
* Log current state and reset.
*/
@Override
public void runHandle() {
String name = getName();
long lastCurrent;
boolean resetState = getResetCounter();
if (resetState) {
lastCurrent = current.getAndSet(0L);
Event.value(name, lastCurrent);
} else {
lastCurrent = current.get();
Event.count(name, lastCurrent);
}
}
@Override
public String toString() {
return super.toString() + " " + getName() + " " + current;
}
CounterProxy getProxyAndReset() {
CounterProxy c = new CounterProxy(getName());
if (getResetCounter()) {
c.setRaw(current.getAndSet(0L));
} else {
c.setRaw(current.get());
}
return c;
}
@Override
public boolean equals(Object o) {
if (o.getClass() != this.getClass()) {
return false;
}
Counter other = (Counter) o;
return getName().equals(other.getName());
}
@Override
public int hashCode() {
return getName().hashCode() + 31 * "Counter".hashCode();
}
}
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