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
boolean	error(long nowNanos, java.lang.String s, java.lang.Object... objects)
boolean	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)
NoSpamLogger.NoSpamLogStatement	getStatement(java.lang.String key, java.lang.String s)
NoSpamLogger.NoSpamLogStatement	getStatement(java.lang.String key, java.lang.String s, long minIntervalNanos)
boolean	info(long nowNanos, java.lang.String s, java.lang.Object... objects)
boolean	info(java.lang.String s, java.lang.Object... objects)
static boolean	log(org.slf4j.Logger logger, NoSpamLogger.Level level, long minInterval, java.util.concurrent.TimeUnit unit, java.lang.String message, java.lang.Object... objects)
static boolean	log(org.slf4j.Logger logger, NoSpamLogger.Level level, java.lang.String key, long minInterval, java.util.concurrent.TimeUnit unit, long nowNanos, java.lang.String message, java.lang.Object... objects)
static boolean	log(org.slf4j.Logger logger, NoSpamLogger.Level level, java.lang.String key, long minInterval, java.util.concurrent.TimeUnit unit, java.lang.String message, java.lang.Object... objects)
boolean	log(NoSpamLogger.Level l, java.lang.String s, long nowNanos, java.lang.Object... objects)
boolean	warn(long nowNanos, java.lang.String s, java.lang.Object... objects)
boolean	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 boolean 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 boolean log(org.slf4j.Logger logger,
                          NoSpamLogger.Level level,
                          java.lang.String key,
                          long minInterval,
                          java.util.concurrent.TimeUnit unit,
                          java.lang.String message,
                          java.lang.Object... objects)

log

public static boolean log(org.slf4j.Logger logger,
                          NoSpamLogger.Level level,
                          java.lang.String key,
                          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 boolean info(long nowNanos,
                    java.lang.String s,
                    java.lang.Object... objects)

info

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

warn

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

warn

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

error

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

error

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

log

public boolean 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 key,
                                                    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)

getStatement

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