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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.catalina.valves;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Queue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicInteger;
import javax.servlet.ServletException;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.Response;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.res.StringManager;
/**
* This valve allows to detect requests that take a long time to process, which might
* indicate that the thread that is processing it is stuck.
* Based on code proposed by TomLu in Bugzilla entry #50306
*
* @author slaurent
*
*/
public class StuckThreadDetectionValve extends ValveBase {
/**
* The descriptive information related to this implementation.
*/
private static final String info =
"org.apache.catalina.valves.StuckThreadDetectionValve/1.0";
/**
* Logger
*/
private static final Log log = LogFactory.getLog(StuckThreadDetectionValve.class);
/**
* The string manager for this package.
*/
private static final StringManager sm =
StringManager.getManager(Constants.Package);
/**
* Keeps count of the number of stuck threads detected
*/
private final AtomicInteger stuckCount = new AtomicInteger(0);
/**
* In seconds. Default 600 (10 minutes).
*/
private int threshold = 600;
/**
* The only references we keep to actual running Thread objects are in
* this Map (which is automatically cleaned in invoke()s finally clause).
* That way, Threads can be GC'ed, eventhough the Valve still thinks they
* are stuck (caused by a long monitor interval)
*/
private ConcurrentHashMap activeThreads =
new ConcurrentHashMap();
/**
*
*/
private Queue completedStuckThreadsQueue =
new ConcurrentLinkedQueue();
/**
* Specify the threshold (in seconds) used when checking for stuck threads.
* If <=0, the detection is disabled. The default is 600 seconds.
*
* @param threshold
* The new threshold in seconds
*/
public void setThreshold(int threshold) {
this.threshold = threshold;
}
/**
* @see #setThreshold(int)
* @return The current threshold in seconds
*/
public int getThreshold() {
return threshold;
}
/**
* Required to enable async support.
*/
public StuckThreadDetectionValve() {
super(true);
}
@Override
protected void initInternal() throws LifecycleException {
super.initInternal();
if (log.isDebugEnabled()) {
log.debug("Monitoring stuck threads with threshold = "
+ threshold
+ " sec");
}
}
/**
* Return descriptive information about this Valve implementation.
*/
@Override
public String getInfo() {
return info;
}
private void notifyStuckThreadDetected(MonitoredThread monitoredThread,
long activeTime, int numStuckThreads) {
if (log.isWarnEnabled()) {
String msg = sm.getString(
"stuckThreadDetectionValve.notifyStuckThreadDetected",
monitoredThread.getThread().getName(), activeTime,
monitoredThread.getStartTime(), numStuckThreads,
monitoredThread.getRequestUri(), threshold);
// msg += "\n" + getStackTraceAsString(trace);
Throwable th = new Throwable();
th.setStackTrace(monitoredThread.getThread().getStackTrace());
log.warn(msg, th);
}
}
private void notifyStuckThreadCompleted(String threadName,
long activeTime, int numStuckThreads) {
if (log.isWarnEnabled()) {
String msg = sm.getString(
"stuckThreadDetectionValve.notifyStuckThreadCompleted",
threadName, activeTime, numStuckThreads);
// Since the "stuck thread notification" is warn, this should also
// be warn
log.warn(msg);
}
}
/**
* {@inheritDoc}
*/
@Override
public void invoke(Request request, Response response)
throws IOException, ServletException {
if (threshold <= 0) {
// short-circuit if not monitoring stuck threads
getNext().invoke(request, response);
return;
}
// Save the thread/runnable
// Keeping a reference to the thread object here does not prevent
// GC'ing, as the reference is removed from the Map in the finally clause
Long key = new Long(Thread.currentThread().getId());
StringBuffer requestUrl = request.getRequestURL();
if(request.getQueryString()!=null) {
requestUrl.append("?");
requestUrl.append(request.getQueryString());
}
MonitoredThread monitoredThread = new MonitoredThread(Thread.currentThread(),
requestUrl.toString());
activeThreads.put(key, monitoredThread);
try {
getNext().invoke(request, response);
} finally {
activeThreads.remove(key);
if (monitoredThread.markAsDone() == MonitoredThreadState.STUCK) {
completedStuckThreadsQueue.add(
new CompletedStuckThread(monitoredThread.getThread().getName(),
monitoredThread.getActiveTimeInMillis()));
}
}
}
@Override
public void backgroundProcess() {
super.backgroundProcess();
long thresholdInMillis = threshold * 1000;
// Check monitored threads, being careful that the request might have
// completed by the time we examine it
for (MonitoredThread monitoredThread : activeThreads.values()) {
long activeTime = monitoredThread.getActiveTimeInMillis();
if (activeTime >= thresholdInMillis && monitoredThread.markAsStuckIfStillRunning()) {
int numStuckThreads = stuckCount.incrementAndGet();
notifyStuckThreadDetected(monitoredThread, activeTime, numStuckThreads);
}
}
// Check if any threads previously reported as stuck, have finished.
for (CompletedStuckThread completedStuckThread = completedStuckThreadsQueue.poll();
completedStuckThread != null; completedStuckThread = completedStuckThreadsQueue.poll()) {
int numStuckThreads = stuckCount.decrementAndGet();
notifyStuckThreadCompleted(completedStuckThread.getName(),
completedStuckThread.getTotalActiveTime(), numStuckThreads);
}
}
public long[] getStuckThreadIds() {
List idList = new ArrayList();
for (MonitoredThread monitoredThread : activeThreads.values()) {
if (monitoredThread.isMarkedAsStuck()) {
idList.add(monitoredThread.getThread().getId());
}
}
long[] result = new long[idList.size()];
for (int i = 0; i < result.length; i++) {
result[i] = idList.get(i);
}
return result;
}
private class MonitoredThread {
/**
* Reference to the thread to get a stack trace from background task
*/
private final Thread thread;
private final String requestUri;
private final long start;
private final AtomicInteger state = new AtomicInteger(
MonitoredThreadState.RUNNING.ordinal());
public MonitoredThread(Thread thread, String requestUri) {
this.thread = thread;
this.requestUri = requestUri;
this.start = System.currentTimeMillis();
}
public Thread getThread() {
return this.thread;
}
public String getRequestUri() {
return requestUri;
}
public long getActiveTimeInMillis() {
return System.currentTimeMillis() - start;
}
public Date getStartTime() {
return new Date(start);
}
public boolean markAsStuckIfStillRunning() {
return this.state.compareAndSet(MonitoredThreadState.RUNNING.ordinal(),
MonitoredThreadState.STUCK.ordinal());
}
public MonitoredThreadState markAsDone() {
int val = this.state.getAndSet(MonitoredThreadState.DONE.ordinal());
return MonitoredThreadState.values()[val];
}
boolean isMarkedAsStuck() {
return this.state.get() == MonitoredThreadState.STUCK.ordinal();
}
}
private class CompletedStuckThread {
private String threadName;
private long totalActiveTime;
public CompletedStuckThread(String threadName, long totalActiveTime) {
this.threadName = threadName;
this.totalActiveTime = totalActiveTime;
}
public String getName() {
return this.threadName;
}
public long getTotalActiveTime() {
return this.totalActiveTime;
}
}
private enum MonitoredThreadState {
RUNNING, STUCK, DONE;
}
}
