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/*
* Conditions Of Use
*
* This software was developed by employees of the National Institute of
* Standards and Technology (NIST), an agency of the Federal Government.
* Pursuant to title 15 Untied States Code Section 105, works of NIST
* employees are not subject to copyright protection in the United States
* and are considered to be in the public domain. As a result, a formal
* license is not needed to use the software.
*
* This software is provided by NIST as a service and is expressly
* provided "AS IS." NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
* OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
* AND DATA ACCURACY. NIST does not warrant or make any representations
* regarding the use of the software or the results thereof, including but
* not limited to the correctness, accuracy, reliability or usefulness of
* the software.
*
* Permission to use this software is contingent upon your acceptance
* of the terms of this agreement
*
* .
*
*/
package android.gov.nist.javax.sip.stack;
import android.gov.nist.core.CommonLogger;
import android.gov.nist.core.StackLogger;
import android.gov.nist.javax.sip.SipStackImpl;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Map;
import java.util.Timer;
import java.util.TimerTask;
import java.util.WeakHashMap;
import java.util.Map.Entry;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
/**
* This class is a simple thread analysis utility which tracks the time each request is stuck inside a JAIN SIP thread.
* It also runs periodic audits. If a request is stuck for too long a thread dump is logged. The parameters are specified
* in the MetricAnalysisConfiguration class and is dynamically reconfigurable.
*
* All fields are public without getters and setters for performance.
*
* Most of the synchronization is achieved without locks
*
* @author Vladimir Ralev
*
*/
public class CallAnalyzer {
private static StackLogger logger = CommonLogger.getLogger(CallAnalyzer.class);
/*
* This is a Thread -> Hashmap association, each hashmap can contain multiple metricts for the thread
*/
private Map> threadMap =
new WeakHashMap>();
/*
* Here we collect statistics about each metric over all threads (sum, avg, etc)
*/
private MetricReferenceMap metricStatisticsMap = new MetricReferenceMap();
private Timer timer = new Timer();
private SipStackImpl stack;
public CallAnalyzer(SipStackImpl stack) {
this.stack = stack;
}
public static class TImeMetricInfo {
public Long totalTime = new Long(0);
public Long numberOfEvents = new Long(0);
public Long averageTime = new Long(1);
public Long lastLoggedEventTime = new Long(0);
protected TimerTask task;
protected MetricAnalysisConfiguration config = new MetricAnalysisConfiguration(5000, 5000, 5000); // default config
}
/**
* Call this method to reconfigure the given metric
*
* @param ref
* @param config
*/
public void configure(MetricReference ref, MetricAnalysisConfiguration config) {
metricStatisticsMap.get(ref).config = config;
if(!isAnalysisStarted(ref)) {
startAnalysis(ref);
}
}
/**
* If the startAnalysis method was called and not stopped
* @param ref
* @return
*/
public boolean isAnalysisStarted(MetricReference ref) {
return metricStatisticsMap.get(ref).task != null;
}
/**
* Get the current stats for the metric over all threads
* @param ref
* @return
*/
public TImeMetricInfo getMetricStats(MetricReference ref) {
return metricStatisticsMap.get(ref);
}
/**
* This is the configuration for the analysis task.
* The analysis job will be run every checkingInterval milliseconds. If an error occurs
* a thread dump will be logged, but there will be only one dump per minimumDumpInterval
* milliseconds. The dump will be logged only if a request is stuck in some thread for more
* than stuckTimeBeforeDump milliseconds.
* @author vladimirralev
*
*/
public static class MetricAnalysisConfiguration {
public MetricAnalysisConfiguration(Long checkingInterval, Long minDumpInterval, Long stuckTimerBeforeDump) {
this.checkingInterval = checkingInterval;
this.minimumDumpInterval = minDumpInterval;
this.stuckTimeBeforeDump = stuckTimerBeforeDump;
}
public MetricAnalysisConfiguration(int checkingInterval, int minDumpInterval, int stuckTimerBeforeDump) {
this.checkingInterval = new Long(checkingInterval);
this.minimumDumpInterval = new Long(minDumpInterval);
this.stuckTimeBeforeDump = new Long(stuckTimerBeforeDump);
}
protected Long checkingInterval;
protected Long minimumDumpInterval;
protected Long stuckTimeBeforeDump;
}
/**
* This is just a name for certain statistic item. Such as a timestmp of request associated with a thread
* @author vladimirralev
*
*/
public static class MetricReference {
public MetricReference(String name) {
this.name = name;
}
public boolean equals(Object other) {
if(other instanceof MetricReference) {
MetricReference stat =(MetricReference) other;
return stat.name.equals(this.name);
}
return false;
}
public int hashCode() {
return this.name.hashCode();
}
public String name;
}
public static class MetricReferenceMap extends WeakHashMap {
/**
*
*/
private static final long serialVersionUID = 393231609328924828L;
public TImeMetricInfo get(Object key) {
if(super.get(key) == null) {
super.put((MetricReference) key, new TImeMetricInfo());
}
return super.get(key);
}
}
public static class StackTrace {
public StackTrace(int delta, String trace) {
this.delta = delta;
this.trace = trace;
}
public int delta;
public String trace;
}
public static class ThreadInfo {
public LinkedList stackTraces = new LinkedList();
public Object data;
}
/**
* Rest all stats and start over with sum, average, etc
* @param metricReference
*/
public void resetStats(MetricReference metricReference) {
TImeMetricInfo info = metricStatisticsMap.get(metricReference);
info.totalTime = new Long(0);
info.numberOfEvents = new Long(0);
info.averageTime = new Long(1);
info.lastLoggedEventTime = new Long(0);
}
public CallAnalyzer() {
}
/**
* Stop the analysis for a given metric, the analysis periodic job will be stopped and stack
* traces will no longer be produced.
* @param metricReference
*/
public void stopAnalysis(final MetricReference metricReference) {
final TImeMetricInfo statInfo = metricStatisticsMap.get(metricReference);
if(statInfo.task != null) {
statInfo.task.cancel();
statInfo.task = null;
}
}
/**
* Start the analysis job that will check the status of the requests periodically and make thread dumps
* if some request is stuck.
* @param metricReference
*/
public void startAnalysis(final MetricReference metricReference) {
stopAnalysis(metricReference);
resetStats(metricReference);
final TImeMetricInfo statInfo = metricStatisticsMap.get(metricReference);
statInfo.task = new TimerTask() {
@Override
public void run() {
try {
Long lastDump = statInfo.lastLoggedEventTime;
// if there has been enough time since the last dump proceed with the check
if(System.currentTimeMillis() - lastDump>statInfo.config.minimumDumpInterval) {
// check all threads for requests that are stuck for too long
Iterator>> threadInfos = threadMap.entrySet().iterator();
while(threadInfos.hasNext()) {
Entry> info = threadInfos.next();
Long entryTime = (Long) info.getValue().get(metricReference);
if(!entryTime.equals(Long.MIN_VALUE)) {
Long delta = System.currentTimeMillis() - entryTime;
// if a thread is stuck for too long log it
if(logger != null && delta>statInfo.config.stuckTimeBeforeDump) {
logger.logWarning("Offending thread:\n" + getCurrentStack(info.getKey()));
StringBuilder sb = new StringBuilder();
Thread[] threads = new Thread[5000];
int count = Thread.enumerate(threads);
for(int q=0; q subInfo = threadMap.get(threads[q]);
if(subInfo != null) {
Long stamp = (Long) threadMap.get(threads[q]).get(metricReference);
if(stamp != null) {
threadStuck = System.currentTimeMillis() - stamp;
}
if(stamp != Long.MIN_VALUE) {
sb.append("->Stuck time:" + threadStuck + " " + getCurrentStack(threads[q]));
}
}
}
logger.logWarning(sb.toString());
threads = null;
break;
}
}
}
}
} catch (Exception ex) {
//Ignore excpetions here - even concurrent modification exceptions are not critical
}}
};
timer.scheduleAtFixedRate(statInfo.task, statInfo.config.checkingInterval, statInfo.config.checkingInterval);
}
/**
* Stop everything
*/
public void stop() {
timer.cancel();
timer = null;
}
public Long getTime(Thread threadId, MetricReference metricReference) {
HashMap attribs = getAttributes(threadId);
return (Long) attribs.get(metricReference);
}
/**
* You can associate Objects for a given thread and display them later for more analysis items.
*
* @param threadId
* @param objectName
* @param object
*/
public void setObject(Thread threadId, MetricReference objectName, Object object) {
getAttributes(threadId).put(objectName, object);
}
/**
* Retrieve items associated with the thread
*
* @param threadId
* @param objectName
* @return
*/
public Object getObject(Thread threadId, String objectName) {
return getAttributes(threadId).get(objectName);
}
public synchronized HashMap getAttributes(Thread threadId) {
HashMap threadLocal = threadMap.get(threadId);
if(threadLocal == null) {
threadLocal = new HashMap();
threadMap.put(threadId, threadLocal);
}
return threadLocal;
}
/**
* Enter a traced zone by the name of metricReference for the current thread. This puts the enter timestamp
* and all lost call calculations will be based on this timestamp
*
* @param threadId
* @param metricReference
*/
public void enter(MetricReference metricReference) {
Thread threadId = Thread.currentThread();
enter(threadId, metricReference);
}
/**
* Leave a traced zone by the name of metricReference for the specified thread. This puts the timestamp in
* inactive mode. No more analysis will be done on this thread.
*
* @param threadId
* @param metricReference
*/
public void leave(MetricReference metricReference) {
Thread threadId = Thread.currentThread();
leave(threadId, metricReference);
}
/**
* Enter a traced zone by the name of metricReference for the specified thread. This puts the enter timestamp
* and all lost call calculations will be based on this timestamp.
*
* @param threadId
* @param metricReference
*/
public void enter(Thread threadId, MetricReference metricReference) {
HashMap attribs = getAttributes(threadId);
attribs.put(metricReference, System.currentTimeMillis());
}
/**
* Leave a traced zone by the name of metricReference for the specifed thread. No more analysis will be done
* on this thread.
*
* @param threadId
* @param metricReference
*/
public void leave(Thread threadId, MetricReference metricReference) {
TImeMetricInfo info = metricStatisticsMap.get(metricReference);
HashMap attribs = getAttributes(threadId);
long delta = System.currentTimeMillis() - (Long) attribs.get(metricReference);
info.totalTime += delta;
info.numberOfEvents ++;
info.averageTime = info.totalTime/info.numberOfEvents;
attribs.put(metricReference, Long.MIN_VALUE);
}
/**
* Current stacktrace of the thread
* @param thread
* @return
*/
public String getCurrentStack(Thread thread) {
StringBuilder sb = new StringBuilder();
sb.append("\n" + thread.getName() + " " + thread.getId() + " " + thread.getState().toString() + "\n");
StackTraceElement[] ste = thread.getStackTrace();
for( StackTraceElement el : ste ) {
sb.append(" " + el.toString() + "\n");
}
return sb.toString();
}
/**
* Returns the stacktraces of all threads
* @return
*/
public String getThreadDump() {
StringBuilder sb = new StringBuilder();
Thread[] threads = new Thread[5000];
int count = Thread.enumerate(threads);
for(int q=0; q0) {
throw new RuntimeException("Should be zero by this point. Leak.");
}
}
static int count =0;
}
