org.apache.cassandra.utils

Class NoSpamLogger

java.lang.Object

org.apache.cassandra.utils.NoSpamLogger

public class NoSpamLogger
extends java.lang.Object

Logging that limits each log statement to firing based on time since the statement last fired. Every logger has a unique timer per statement. Minimum time between logging is set for each statement the first time it is used and a subsequent attempt to request that statement with a different minimum time will result in the original time being used. No warning is provided if there is a mismatch. If the statement is cached and used to log directly then only a volatile read will be required in the common case. If the Logger is cached then there is a single concurrent hash map lookup + the volatile read. If neither the logger nor the statement is cached then it is two concurrent hash map lookups + the volatile read.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	NoSpamLogger.Level Levels for programmatically specifying the severity of a log statement
class	NoSpamLogger.NoSpamLogStatement

Method Summary

Modifier and Type	Method and Description
void	error(long nowNanos, java.lang.String s, java.lang.Object... objects)
void	error(java.lang.String s, java.lang.Object... objects)
static NoSpamLogger	getLogger(org.slf4j.Logger logger, long minInterval, java.util.concurrent.TimeUnit unit)
static NoSpamLogger.NoSpamLogStatement	getStatement(org.slf4j.Logger logger, java.lang.String message, long minInterval, java.util.concurrent.TimeUnit unit)
NoSpamLogger.NoSpamLogStatement	getStatement(java.lang.String s)
NoSpamLogger.NoSpamLogStatement	getStatement(java.lang.String s, long minIntervalNanos)
NoSpamLogger.NoSpamLogStatement	getStatement(java.lang.String s, long minInterval, java.util.concurrent.TimeUnit unit)
void	info(long nowNanos, java.lang.String s, java.lang.Object... objects)
void	info(java.lang.String s, java.lang.Object... objects)
static void	log(org.slf4j.Logger logger, NoSpamLogger.Level level, long minInterval, java.util.concurrent.TimeUnit unit, long nowNanos, java.lang.String message, java.lang.Object... objects)
static void	log(org.slf4j.Logger logger, NoSpamLogger.Level level, long minInterval, java.util.concurrent.TimeUnit unit, java.lang.String message, java.lang.Object... objects)
void	log(NoSpamLogger.Level l, java.lang.String s, long nowNanos, java.lang.Object... objects)
void	warn(long nowNanos, java.lang.String s, java.lang.Object... objects)
void	warn(java.lang.String s, java.lang.Object... objects)

Methods inherited from class java.lang.Object

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

Method Detail

getLogger

public static NoSpamLogger getLogger(org.slf4j.Logger logger,
                                     long minInterval,
                                     java.util.concurrent.TimeUnit unit)

log

public static void log(org.slf4j.Logger logger,
                       NoSpamLogger.Level level,
                       long minInterval,
                       java.util.concurrent.TimeUnit unit,
                       java.lang.String message,
                       java.lang.Object... objects)

log

public static void log(org.slf4j.Logger logger,
                       NoSpamLogger.Level level,
                       long minInterval,
                       java.util.concurrent.TimeUnit unit,
                       long nowNanos,
                       java.lang.String message,
                       java.lang.Object... objects)

getStatement

public static NoSpamLogger.NoSpamLogStatement getStatement(org.slf4j.Logger logger,
                                                           java.lang.String message,
                                                           long minInterval,
                                                           java.util.concurrent.TimeUnit unit)

info

public void info(long nowNanos,
                 java.lang.String s,
                 java.lang.Object... objects)

info

public void info(java.lang.String s,
                 java.lang.Object... objects)

warn

public void warn(long nowNanos,
                 java.lang.String s,
                 java.lang.Object... objects)

warn

public void warn(java.lang.String s,
                 java.lang.Object... objects)

error

public void error(long nowNanos,
                  java.lang.String s,
                  java.lang.Object... objects)

error

public void error(java.lang.String s,
                  java.lang.Object... objects)

log

public void log(NoSpamLogger.Level l,
                java.lang.String s,
                long nowNanos,
                java.lang.Object... objects)

getStatement

public NoSpamLogger.NoSpamLogStatement getStatement(java.lang.String s)

getStatement

public NoSpamLogger.NoSpamLogStatement getStatement(java.lang.String s,
                                                    long minInterval,
                                                    java.util.concurrent.TimeUnit unit)

getStatement

public NoSpamLogger.NoSpamLogStatement getStatement(java.lang.String s,
                                                    long minIntervalNanos)