Package org.apache.hadoop.hbase.client.metrics

Class ScanMetricsUtil

java.lang.Object

org.apache.hadoop.hbase.client.metrics.ScanMetricsUtil

@Private
public final class ScanMetricsUtil
extends Object

Constructor Summary

Constructors

Modifier	Constructor	Description
private	ScanMetricsUtil()

Method Summary

Modifier and Type	Method	Description
(package private) static void	addToCounter(Map<String,AtomicLong> counters, String counterName, long delta)	Increments the counter with counterName by delta, does nothing if counter does not exist.
(package private) static Map<String,Long>	collectMetrics(Map<String,AtomicLong> counters, boolean reset)	Get all the values.
(package private) static AtomicLong	createCounter(Map<String,AtomicLong> counters, String counterName)	Creates a new counter with the specified name and stores it in the counters map.
(package private) static AtomicLong	getCounter(Map<String,AtomicLong> counters, String counterName)	Returns AtomicLong instance for this counter name, null if counter does not exist.
(package private) static boolean	hasCounter(Map<String,AtomicLong> counters, String counterName)	Returns true if a counter exists with the counterName.
(package private) static void	setCounter(Map<String,AtomicLong> counters, String counterName, long value)	Sets counter with counterName to passed in value, does nothing if counter does not exist.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ScanMetricsUtil

private ScanMetricsUtil()

Method Details

createCounter

static AtomicLong createCounter(Map<String,AtomicLong> counters,
 String counterName)

Creates a new counter with the specified name and stores it in the counters map.

Returns:

AtomicLong instance for the counter with counterName

setCounter

static void setCounter(Map<String,AtomicLong> counters,
 String counterName,
 long value)

Sets counter with counterName to passed in value, does nothing if counter does not exist.

addToCounter

static void addToCounter(Map<String,AtomicLong> counters,
 String counterName,
 long delta)

Increments the counter with counterName by delta, does nothing if counter does not exist.

hasCounter

static boolean hasCounter(Map<String,AtomicLong> counters,
 String counterName)

Returns true if a counter exists with the counterName.

getCounter

static AtomicLong getCounter(Map<String,AtomicLong> counters,
 String counterName)

Returns AtomicLong instance for this counter name, null if counter does not exist.

collectMetrics

static Map<String,Long> collectMetrics(Map<String,AtomicLong> counters,
 boolean reset)

Get all the values. If reset is true, we will reset the all AtomicLongs back to 0.

Parameters:

reset - whether to reset the AtomicLongs to 0.

Returns:

A Map of String -> Long for metrics