김용환 블로그(2004-2020) :: 'Web service' 카테고리의 글 목록 (12 Page)

package org.apache.catalina.loader; 

import java.io.IOException; 
import java.util.Timer; 
import java.util.TimerTask; 

import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 

import org.apache.catalina.Context; 
import org.apache.catalina.startup.Tomcat; 
import org.apache.catalina.startup.TomcatBaseTest; 

public class TestWebappClassLoaderMemoryLeak extends TomcatBaseTest { 

public void testTimerThreadLeak() throws Exception { 
Tomcat tomcat = getTomcatInstance(); 

// Must have a real docBase - just use temp 
Context ctx = 
tomcat.addContext("/", System.getProperty("java.io.tmpdir")); 

Tomcat.addServlet(ctx, "taskServlet", new TaskServlet()); 
ctx.addServletMapping("/", "taskServlet"); 

tomcat.start(); 

// This will trigger the timer & thread creation 
getUrl("http://localhost:" + getPort() + "/"); 

// Stop the context 
ctx.stop(); 

// If the thread still exists, we have a thread/memory leak 
try { 
Thread.sleep(1000); 
} catch(InterruptedException ie) { 
// ignore 
} 
Thread[] threads = getThreads(); 
for (Thread thread : threads) { 
if (thread != null && 
TaskServlet.TIMER_THREAD_NAME.equals(thread.getName())) { 
fail("Timer thread still running"); 
} 
} 
} 

/* 
* Get the set of current threads as an array. 
* Copied from WebappClassLoader 
*/ 
private Thread[] getThreads() { 
// Get the current thread group 
ThreadGroup tg = Thread.currentThread( ).getThreadGroup( ); 
// Find the root thread group 
while (tg.getParent() != null) { 
tg = tg.getParent(); 
} 

int threadCountGuess = tg.activeCount() + 50; 
Thread[] threads = new Thread[threadCountGuess]; 
int threadCountActual = tg.enumerate(threads); 
// Make sure we don't miss any threads 
while (threadCountActual == threadCountGuess) { 
threadCountGuess *=2; 
threads = new Thread[threadCountGuess]; 
// Note tg.enumerate(Thread[]) silently ignores any threads that 
// can't fit into the array 
threadCountActual = tg.enumerate(threads); 
} 

return threads; 
} 

private static final class TaskServlet extends HttpServlet { 

private static final long serialVersionUID = 1L; 
private static final String TIMER_THREAD_NAME = "leaked-thread"; 

@Override 
protected void doGet(HttpServletRequest req, HttpServletResponse resp) 
throws ServletException, IOException { 
Timer timer = new Timer(TIMER_THREAD_NAME); 
timer.schedule(new LocalTask(), 0, 10000); 
} 

} 

private static final class LocalTask extends TimerTask { 

@Override 
public void run() { 
// Doesn't actually need to do anything. 
} 

} 
} 
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17	package org.apache.catalina.loader;
18
19	import java.io.IOException;
20	import java.util.Timer;
21	import java.util.TimerTask;
22
23	import javax.servlet.ServletException;
24	import javax.servlet.http.HttpServlet;
25	import javax.servlet.http.HttpServletRequest;
26	import javax.servlet.http.HttpServletResponse;
27
28	import org.apache.catalina.Context;
29	import org.apache.catalina.startup.Tomcat;
30	import org.apache.catalina.startup.TomcatBaseTest;
31
32	public class TestWebappClassLoaderMemoryLeak extends TomcatBaseTest {
33
34	public void testTimerThreadLeak() throws Exception {
35	Tomcat tomcat = getTomcatInstance();
36
37	// Must have a real docBase - just use temp
38	Context ctx =
39	tomcat.addContext("/", System.getProperty("java.io.tmpdir"));
40
41	Tomcat.addServlet(ctx, "taskServlet", new TaskServlet());
42	ctx.addServletMapping("/", "taskServlet");
43
44	tomcat.start();
45
46	// This will trigger the timer & thread creation
47	getUrl("http://localhost:" + getPort() + "/");
48
49	// Stop the context
50	ctx.stop();
51
52	// If the thread still exists, we have a thread/memory leak
53	try {
54	Thread.sleep(1000);
55	} catch(InterruptedException ie) {
56	// ignore
57	}
58	Thread[] threads = getThreads();
59	for (Thread thread : threads) {
60	if (thread != null &&
61	TaskServlet.TIMER_THREAD_NAME.equals(thread.getName())) {
62	fail("Timer thread still running");
63	}
64	}
65	}
66
67	/*
68	* Get the set of current threads as an array.
69	* Copied from WebappClassLoader
70	*/
71	private Thread[] getThreads() {
72	// Get the current thread group
73	ThreadGroup tg = Thread.currentThread( ).getThreadGroup( );
74	// Find the root thread group
75	while (tg.getParent() != null) {
76	tg = tg.getParent();
77	}
78
79	int threadCountGuess = tg.activeCount() + 50;
80	Thread[] threads = new Thread[threadCountGuess];
81	int threadCountActual = tg.enumerate(threads);
82	// Make sure we don't miss any threads
83	while (threadCountActual == threadCountGuess) {
84	threadCountGuess *=2;
85	threads = new Thread[threadCountGuess];
86	// Note tg.enumerate(Thread[]) silently ignores any threads that
87	// can't fit into the array
88	threadCountActual = tg.enumerate(threads);
89	}
90
91	return threads;
92	}
93
94	private static final class TaskServlet extends HttpServlet {
95
96	private static final long serialVersionUID = 1L;
97	private static final String TIMER_THREAD_NAME = "leaked-thread";
98
99	@Override
100	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
101	throws ServletException, IOException {
102	Timer timer = new Timer(TIMER_THREAD_NAME);
103	timer.schedule(new LocalTask(), 0, 10000);
104	}
105
106	}
107
108	private static final class LocalTask extends TimerTask {
109
110	@Override
111	public void run() {
112	// Doesn't actually need to do anything.
113	}
114
115	}
116	}
Description:	Encloses directives that are processed conditional on the presence or absence of a specific module
Syntax:	`<IfModule [!]module-name> ... </IfModule>`
Context:	server config, virtual host, directory, .htaccess
Override:	All
Status:	Core
Module:	core
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cacheMaxSize	Maximum size of the static resource cache in kilobytes. If not specified, the default value is 10240 (10 megabytes).
cacheObjectMaxSize	Maximum size of the static resource that will be placed in the cache. If not specified, the default value is 512 (512 kilobytes). If this value is greater than cacheMaxSize/20 it will be reduced to cacheMaxSize/20.