Author: markt
Date: Tue Jan 9 21:57:26 2018
New Revision: 1820708
URL: http://svn.apache.org/viewvc?rev=1820708&view=rev
Log:
Prevent NullPointerException and other errors if the stock ticker example is
running when the examples web application is stopped.
Added:
tomcat/tc8.0.x/trunk/webapps/examples/WEB-INF/classes/async/AsyncStockContextListener.java
- copied unchanged from r1820705,
tomcat/trunk/webapps/examples/WEB-INF/classes/async/AsyncStockContextListener.java
Modified:
tomcat/tc8.0.x/trunk/ (props changed)
tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml
tomcat/tc8.0.x/trunk/webapps/examples/WEB-INF/classes/async/AsyncStockServlet.java
tomcat/tc8.0.x/trunk/webapps/examples/WEB-INF/classes/async/Stockticker.java
tomcat/tc8.0.x/trunk/webapps/examples/WEB-INF/web.xml
Propchange: tomcat/tc8.0.x/trunk/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Tue Jan 9 21:57:26 2018
@@ -1,2 +1,2 @@
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25907,1725910,1725914,1725920,1725926,1726177,1726202,1726628,1726632,1726637,1726639,1726648,1726651,1726654,1726669,1726676,1726803,1726925-1726926,1726972-1726973,1726991,1727162,1727670,1727675,1727899,1727914,1727917,1728091,1728138,1728433,1728448,1728664,1728677,1729185,1729361,1729625,1729730,1730101-1730102,1730137,1730612,1730946-1730975,1731008,1731055,1731079,1731283,1731856,1731882,1731946-1731958,1731976-1731983,1732359,1732488,1732900-1733448,1733602,1733617-1733963,1733978,1734113,1734128,1734192,1734258,1734301,1734418-1734454,1734466-1734512,1734522,1734592,1734594,1734597,1735041,1735577,1736162,1736209,1736280,1736646,1736836,1737119,1737280,1737339,1737632,1737664,1737715,1737834,1737903,1737959,1738014-1738015,1738018,1738022,1738039,1738043,1738059-1738060,1738147,1738149,1738174-1738175,1738643,1738850,1738982,1738996,1739079-1739081,1739087,1739113,1739153,1739172,1739176,1739474,1739492,1739726,1739762,1739775,1739814,1739817-1739818,1739975,1740131,1740324
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950-1754951,1755214,1755224,1755230,1755646-1755647,1755650,1755675,1755693,1755717,1755884,1755890,1755918-1755919,1755942,1756013,1756019,1756039,1756408,1756410,1756898,1756939,1757123-1757124,1757126,1757128,1757132-1757133,1757167-1757168,1757175,1757180,1757182,1757195,1757271,1757278,1757347,1757353-1757354,1757363,1757374,1757399,1757406,1757408,1757495,1757499,1757527,1757997,1758072-1758075,1758078-1758079,1758292,1758369,1758423,1758425-1758427,1758430,1758486-1758487,1758499,1758556,1758582,1758584,1758588,1758842,1759019,1759224,1759227,1759252,1759274,1759513-1759516,1759611,1760022,1760300,1760397,1760446,1760454,1760640,1760648,1761057,1761491,1761498,1761500-1761501,1761550,1761625-1761626,1761628,1761682,1761740,1762123,1762168,1762172,1762182,1762202,1762288,1762296,1762348,1762353,1762374,1762541,1762608,1762710,1762766,1762769,1762944,1762947,1762953,1763167,1763179,1763232,1763259,1763271-1763272,1763276,1763319,1763370,1763372,1763375,1763377,1763393,1763412,1
763430,1763477,1763479,1763512,1763574,1763634-1763635,1763718,1763786,1763798-1763799,1763810,1764083,1764659,1764682,1764897,1765299,1765358,1765439,1765571,1766276,1766514,1766822,1766834,1766840,1767328,1767362,1767368,1767429,1767471,1767505,1767641-1767644,1768651,1768762,1768922,1769263,1770140,1770180,1770258,1770656,1770666,1770718,1770762,1771087,1771139,1771386,1771611,1771613,1771711,1771718,1771723-1771724,1771730,1771743,1771752,1771963,1772174,1772223,1772229,1772554,1772849,1772947,1773418,1773756,1773813-1773814,1774052,1774131,1774248,1774253,1774257,1774259,1774262,1774267,1774271,1774303,1774340,1774406,1774412,1775596,1776540,1776937,1777011,1777173,1777211,1777261,1777524,1777605,1777647,1778061,1778138-1778139,1778141-1778150,1778154,1779654,1779718,1780109,1780120,1780189,1780196,1780488,1780514-1780516,1780601,1781569,1781986,1782814,1782857,1782868,1782946,1783144,1783155,1783408,1784182,1784565,1784583,1784657,1784669,1784712,1784751,1784963,1785271,178566
7,1785762,1785774,1785823,1786070,1786123-1786124,1786127,1786129,1786341,1786378,1786844,1787250,1788224,1788241-1788242,1788248,1788323-1788324,1788328,1788741,1788747,1788764,1789051,1789400,1789415,1789442,1789733,1789735,1789744-1789745,1790119,1790180,1790183,1790376,1790443,1791027-1791028,1791050,1791527,1791557,1792460,1792468,1793468,1793487,1793498,1793502,1793514,1793712,1793736,1793746,1793771,1793819,1793980,1794674,1795278,1795298,1795305,1795813,1795893,1796275,1796693-1796694,1796806,1796836,1796873,1796878,1797197,1797338,1797344,1797354-1797355,1797516,1797678,1797692,1797694,1797748,1797828,1798280,1798371,1798379,1798384,1798390,1798395,1798419,1798505,1798507,1798509,1798533,1798546,1798561,1798977,1799115,1799126,1799164,1799190,1799194,1799285,1799368,1799893,1799895,1799916,1800136-1800138,1800202,1800309,1800390,1800617,1800791,1800816,1800981,1800984,1800988,1801686,1801688,1801709,1801717,1801774,1801778,1802083,1802403,1802475,1802490,1802639,1802796,180
2820,1802828,1802833,1802836,1803205,1803446,1803451,1803616,1803828,1803901,1804306,1804461-1804462,1804501,1804506-1804507,1804890,1804906,1805613,1805637,1805645,1805652,1805782,1806736,1806794,1806798,1806801,1806807,1806966,1806973,1807004,1807205-1807206,1807455,1807686,1807698,1808116,1808156,1808266,1808466,1809011,1809025,1809141,1809143-1809144,1809146,1809212,1809214,1809239,1809248,1809265,1809434,1809669,1809674,1809684,1809711,1809908,1809922,1810106,1810300,1811119,1811122,1811132,1811137,1811198-1811201,1811203-1811206,1811220,1811235,1811246,1811328,1811560,1811704,1811837-1811839,1811861,1811932,1812088,1812092,1812103,1812107,1812113,1812129,1812134-1812136,1812184,1812315,1812401,1812617,1814825,1814973,1814980,1815066,1815069,1815208,1815215,1815319,1815325,1815451,1815459,1815505,1815615,1815903,1815944,1815954,1816083,1816120,1816128,1816140,1816147,1816157,1816338,1816563,1816647,1817089,1817092,1817096,1817104,1817126,1817136-1817137,1817196,1817223,1817298,
1817305,1817495,1817517,1817520,1818179,1818184,1820003,1820138,1820153,1820194,1820196-1820197,1820202,1820206,1820222,1820272,1820279,1820302,1820634,1820701,1820705
Modified: tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml
URL:
http://svn.apache.org/viewvc/tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml?rev=1820708&r1=1820707&r2=1820708&view=diff
==============================================================================
--- tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml (original)
+++ tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml Tue Jan 9 21:57:26 2018
@@ -114,6 +114,11 @@
application. (markt)
</fix>
<fix>
+ <bug>61886</bug>: Prevent <code>NullPointerException</code> and other
+ errors if the stock ticker example is running when the examples web
+ application is stopped. (markt)
+ </fix>
+ <fix>
<bug>61910</bug>: Clarify the meaning of the <code>allowLinking</code>
option in the documentation web application. (markt)
</fix>
Modified:
tomcat/tc8.0.x/trunk/webapps/examples/WEB-INF/classes/async/AsyncStockServlet.java
URL:
http://svn.apache.org/viewvc/tomcat/tc8.0.x/trunk/webapps/examples/WEB-INF/classes/async/AsyncStockServlet.java?rev=1820708&r1=1820707&r2=1820708&view=diff
==============================================================================
---
tomcat/tc8.0.x/trunk/webapps/examples/WEB-INF/classes/async/AsyncStockServlet.java
(original)
+++
tomcat/tc8.0.x/trunk/webapps/examples/WEB-INF/classes/async/AsyncStockServlet.java
Tue Jan 9 21:57:26 2018
@@ -25,6 +25,7 @@ import java.util.concurrent.atomic.Atomi
import javax.servlet.AsyncContext;
import javax.servlet.AsyncEvent;
import javax.servlet.AsyncListener;
+import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
@@ -40,7 +41,6 @@ public class AsyncStockServlet extends H
private static final ConcurrentLinkedQueue<AsyncContext> clients =
new ConcurrentLinkedQueue<>();
private static final AtomicInteger clientcount = new AtomicInteger(0);
- private static final Stockticker ticker = new Stockticker();
public AsyncStockServlet() {
System.out.println("AsyncStockServlet created");
@@ -58,6 +58,8 @@ public class AsyncStockServlet extends H
resp.setContentType("text/plain");
clients.add(actx);
if (clientcount.incrementAndGet()==1) {
+ Stockticker ticker = (Stockticker)
req.getServletContext().getAttribute(
+ AsyncStockContextListener.STOCK_TICKER_KEY);
ticker.addTickListener(this);
}
} else {
@@ -99,8 +101,27 @@ public class AsyncStockServlet extends H
@Override
+ public void shutdown() {
+ // The web application is shutting down. Complete any AsyncContexts
+ // associated with an active client.
+ Iterator<AsyncContext> it = clients.iterator();
+ while (it.hasNext()) {
+ AsyncContext actx = it.next();
+ try {
+ actx.complete();
+ } catch (Exception e) {
+ // Ignore. The async error handling will deal with this.
+ }
+ }
+ }
+
+
+ @Override
public void onComplete(AsyncEvent event) throws IOException {
if (clients.remove(event.getAsyncContext()) &&
clientcount.decrementAndGet()==0) {
+ ServletContext sc =
event.getAsyncContext().getRequest().getServletContext();
+ Stockticker ticker = (Stockticker) sc.getAttribute(
+ AsyncStockContextListener.STOCK_TICKER_KEY);
ticker.removeTickListener(this);
}
}
Modified:
tomcat/tc8.0.x/trunk/webapps/examples/WEB-INF/classes/async/Stockticker.java
URL:
http://svn.apache.org/viewvc/tomcat/tc8.0.x/trunk/webapps/examples/WEB-INF/classes/async/Stockticker.java?rev=1820708&r1=1820707&r2=1820708&view=diff
==============================================================================
---
tomcat/tc8.0.x/trunk/webapps/examples/WEB-INF/classes/async/Stockticker.java
(original)
+++
tomcat/tc8.0.x/trunk/webapps/examples/WEB-INF/classes/async/Stockticker.java
Tue Jan 9 21:57:26 2018
@@ -37,6 +37,12 @@ public class Stockticker implements Runn
}
public synchronized void stop() {
+ // On context stop this can be called multiple times.
+ // NO-OP is the ticker thread is not set
+ // (i.e. stop() has already completed)
+ if (ticker == null) {
+ return;
+ }
run = false;
try {
ticker.join();
@@ -47,6 +53,17 @@ public class Stockticker implements Runn
ticker = null;
}
+ public void shutdown() {
+ // Notify each listener of the shutdown. This enables them to
+ // trigger any necessary clean-up.
+ for (TickListener l : listeners) {
+ l.shutdown();
+ }
+ // Wait for the thread to stop. This prevents warnings in the logs
+ // that the thread is still active when the context stops.
+ stop();
+ }
+
public void addTickListener(TickListener listener) {
if (listeners.add(listener)) {
if (counter.incrementAndGet()==1) start();
@@ -98,6 +115,7 @@ public class Stockticker implements Runn
public static interface TickListener {
public void tick(Stock stock);
+ public void shutdown();
}
public static final class Stock implements Cloneable {
Modified: tomcat/tc8.0.x/trunk/webapps/examples/WEB-INF/web.xml
URL:
http://svn.apache.org/viewvc/tomcat/tc8.0.x/trunk/webapps/examples/WEB-INF/web.xml?rev=1820708&r1=1820707&r2=1820708&view=diff
==============================================================================
--- tomcat/tc8.0.x/trunk/webapps/examples/WEB-INF/web.xml (original)
+++ tomcat/tc8.0.x/trunk/webapps/examples/WEB-INF/web.xml Tue Jan 9 21:57:26
2018
@@ -115,6 +115,11 @@
<listener-class>listeners.SessionListener</listener-class>
</listener>
+ <!-- Define listeners required by examples -->
+ <listener>
+ <listener-class>async.AsyncStockContextListener</listener-class>
+ </listener>
+
<!-- Define servlets that are included in the example application -->
<servlet>
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