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get rid of the really really frequent temporary object creation

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This commit is contained in:
jrandom
2004-10-04 13:53:10 +00:00
committed by zzz
parent a3ba968386
commit d092dd79ba
1 changed files with 85 additions and 44 deletions
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101
core/java/src/net/i2p/stat/BufferedStatLog.java
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@ -12,24 +12,34 @@ import java.util.StringTokenizer;
import net.i2p.I2PAppContext;
import net.i2p.util.I2PThread;
import net.i2p.util.Log;
/**
*
*/
public class BufferedStatLog implements StatLog {
private I2PAppContext _context;
private List _events;
private Log _log;
private StatEvent _events[];
private int _eventNext;
private int _lastWrite;
/** flush stat events to disk after this many events (or 30s)*/
private int _flushFrequency;
private List _statFilters;
private String _lastFilters;
private BufferedWriter _out;
private String _outFile;
public BufferedStatLog(I2PAppContext ctx) {
_context = ctx;
_events = new ArrayList(1000);
_log = ctx.logManager().getLog(BufferedStatLog.class);
_events = new StatEvent[1000];
for (int i = 0; i < 1000; i++)
_events[i] = new StatEvent();
_eventNext = 0;
_lastWrite = _events.length-1;
_statFilters = new ArrayList(10);
_flushFrequency = 1000;
_flushFrequency = 500;
I2PThread writer = new I2PThread(new StatLogWriter(), "StatLogWriter");
writer.setDaemon(true);
writer.start();
@ -37,9 +47,22 @@ public class BufferedStatLog implements StatLog {
public void addData(String scope, String stat, long value, long duration) {
synchronized (_events) {
_events.add(new StatEvent(scope, stat, value, duration));
if (_events.size() > _flushFrequency)
_events[_eventNext].init(scope, stat, value, duration);
_eventNext = (_eventNext + 1) % _events.length;
if (_eventNext == _lastWrite)
_lastWrite = (_lastWrite + 1) % _events.length; // drop an event
if (_log.shouldLog(Log.DEBUG))
_log.debug("AddData next=" + _eventNext + " lastWrite=" + _lastWrite);
if (_eventNext > _lastWrite) {
if (_eventNext - _lastWrite >= _flushFrequency)
_events.notifyAll();
} else {
if (_events.length - 1 - _lastWrite + _eventNext >= _flushFrequency)
_events.notifyAll();
}
}
}
@ -52,12 +75,17 @@ public class BufferedStatLog implements StatLog {
private void updateFilters() {
String val = _context.getProperty("stat.logFilters");
if (val != null) {
if ( (_lastFilters != null) && (_lastFilters.equals(val)) ) {
// noop
} else {
StringTokenizer tok = new StringTokenizer(val, ",");
synchronized (_statFilters) {
_statFilters.clear();
while (tok.hasMoreTokens())
_statFilters.add(tok.nextToken().trim());
}
}
_lastFilters = val;
} else {
synchronized (_statFilters) { _statFilters.clear(); }
}
@ -79,45 +107,58 @@ public class BufferedStatLog implements StatLog {
private class StatLogWriter implements Runnable {
private SimpleDateFormat _fmt = new SimpleDateFormat("yyyyMMdd HH:mm:ss.SSS");
public void run() {
List cur = new ArrayList(1000);
int writeStart = -1;
int writeEnd = -1;
while (true) {
synchronized (_events) {
if (_events.size() < _flushFrequency) {
if (_eventNext > _lastWrite) {
if (_eventNext - _lastWrite < _flushFrequency)
try { _events.wait(30*1000); } catch (InterruptedException ie) {}
} else {
if (_events.length - 1 - _lastWrite + _eventNext < _flushFrequency)
try { _events.wait(30*1000); } catch (InterruptedException ie) {}
}
cur.addAll(_events);
_events.clear();
writeStart = (_lastWrite + 1) % _events.length;
writeEnd = _eventNext;
_lastWrite = (writeEnd == 0 ? _events.length-1 : writeEnd - 1);
}
if (writeStart != writeEnd) {
try {
if (_log.shouldLog(Log.DEBUG))
_log.debug("writing " + writeStart +"->"+ writeEnd);
writeEvents(writeStart, writeEnd);
} catch (Exception e) {
_log.error("error writing " + writeStart +"->"+ writeEnd, e);
}
if (cur.size() > 0) {
writeEvents(cur);
cur.clear();
}
}
}
private void writeEvents(List events) {
private void writeEvents(int start, int end) {
try {
updateFilters();
for (int i = 0; i < events.size(); i++) {
StatEvent evt = (StatEvent)events.get(i);
if (!shouldLog(evt.getStat())) continue;
int cur = start;
while (cur != end) {
if (shouldLog(_events[cur].getStat())) {
String when = null;
synchronized (_fmt) {
when = _fmt.format(new Date(evt.getTime()));
when = _fmt.format(new Date(_events[cur].getTime()));
}
_out.write(when);
_out.write(" ");
if (evt.getScope() == null)
if (_events[cur].getScope() == null)
_out.write("noScope ");
else
_out.write(evt.getScope() + " ");
_out.write(evt.getStat()+" ");
_out.write(evt.getValue()+" ");
_out.write(evt.getDuration()+"\n");
_out.write(_events[cur].getScope() + " ");
_out.write(_events[cur].getStat()+" ");
_out.write(_events[cur].getValue()+" ");
_out.write(_events[cur].getDuration()+"\n");
}
cur = (cur + 1) % _events.length;
}
_out.flush();
} catch (IOException ioe) {
ioe.printStackTrace();
_log.error("Error writing out", ioe);
}
}
}
@ -129,18 +170,18 @@ public class BufferedStatLog implements StatLog {
private long _value;
private long _duration;
public StatEvent(String scope, String stat, long value, long duration) {
public long getTime() { return _time; }
public String getScope() { return _scope; }
public String getStat() { return _stat; }
public long getValue() { return _value; }
public long getDuration() { return _duration; }
public void init(String scope, String stat, long value, long duration) {
_scope = scope;
_stat = stat;
_value = value;
_duration = duration;
_time = _context.clock().now();
}
public long getTime() { return _time; }
public String getScope() { return _scope; }
public String getStat() { return _stat; }
public long getValue() { return _value; }
public long getDuration() { return _duration; }
}
}