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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.log;
import com.yahoo.text.Utf8;
import java.nio.MappedByteBuffer;
import java.util.logging.Level;
/**
* a level controller that does lookup in a file via a memory-mapped
* buffer for realtime logging control.
* Should only be used internally in the log library
*/
@SuppressWarnings("deprecation")
class MappedLevelController implements LevelController {
private static final int ONVAL = 0x20204f4e; // equals " ON" in file
private static final int OFFVAL = 0x204f4646; // equals " OFF" in file
private MappedByteBuffer mapBuf;
private int offset;
private java.util.logging.Logger associate;
public MappedLevelController(MappedByteBuffer buf,
int firstoffset,
String name)
{
this.mapBuf = buf;
this.offset = firstoffset;
this.associate = java.util.logging.Logger.getLogger(name);
}
/**
* return the current state as a string
* (directly fetched from the file via the mapping buffer)
**/
public String getOnOffString() {
byte[] levels = new byte[4 * VespaLevelControllerRepo.numLevels];
for (int i = 0; i < levels.length; i++) {
levels[i] = mapBuf.get(offset + i);
}
return Utf8.toString(levels);
}
/**
* check that each controlled level is either ON or OFF.
**/
public static boolean checkOnOff(MappedByteBuffer mapBuf,
int offset)
{
for (int i = 0; i < VespaLevelControllerRepo.numLevels; i++) {
int off = offset + 4 * i;
int val = mapBuf.getInt(off);
if (val != ONVAL && val != OFFVAL) {
System.err.println("bad on/off value: "+val);
return false;
}
}
return true;
}
/**
* make sure our associated java.util.Logger instance
* gets the correct logging level so it can avoid sending
* us lots of debug and spam log messages that will
* be discarded in the usual case.
**/
public void checkBack() {
associate.setLevel(getLevelLimit());
}
public Level getLevelLimit() {
Level lvl;
if (isOn(LogLevel.LogCtlSPAM)) {
lvl = LogLevel.ALL;
} else if (isOn(LogLevel.LogCtlDEBUG)) {
lvl = LogLevel.FINE;
} else if (isOn(LogLevel.LogCtlCONFIG)) {
lvl = LogLevel.CONFIG;
} else if (isOn(LogLevel.LogCtlINFO)) {
lvl = LogLevel.INFO;
} else if (isOn(LogLevel.LogCtlWARNING)) {
lvl = LogLevel.WARNING;
} else {
lvl = LogLevel.SEVERE;
}
return lvl;
}
/**
* is a specific Vespa level ON or OFF in the file?
**/
private boolean isOn(int num) {
int off = offset + num*4;
int val = mapBuf.getInt(off);
if (val == OFFVAL)
return false;
return true;
}
/**
* should we publish a log messages on the given java Level?
**/
public boolean shouldLog(Level level) {
int val = level.intValue();
// event is special and handled first:
if (val == LogLevel.IntValEVENT) { return isOn(LogLevel.LogCtlEVENT); }
// all other levels are handled in "severity order":
if (val >= LogLevel.IntValFATAL) { return isOn(LogLevel.LogCtlFATAL); }
// LogLevel.ERROR between here
if (val >= LogLevel.IntValSEVERE) { return isOn(LogLevel.LogCtlERROR); }
if (val >= LogLevel.IntValWARNING) { return isOn(LogLevel.LogCtlWARNING); }
if (val >= LogLevel.IntValINFO) { return isOn(LogLevel.LogCtlINFO); }
if (val >= LogLevel.IntValCONFIG) { return isOn(LogLevel.LogCtlCONFIG); }
// LogLevel.DEBUG between here
// LogLevel.FINE between here
if (val >= LogLevel.IntValFINER) { return isOn(LogLevel.LogCtlDEBUG); }
// LogLevel.FINEST and
// LogLevel.SPAM:
return isOn(LogLevel.LogCtlSPAM);
}
}
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