Author: fhanik
Date: Thu Jul 24 14:00:38 2014
New Revision: 1613137
URL: http://svn.apache.org/r1613137
Log:
Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=53367
Fix interrupt handling in the FairBlockingQueue
Added:
tomcat/tc7.0.x/trunk/modules/jdbc-pool/src/test/java/org/apache/tomcat/jdbc/bugs/Bug53367.java
(with props)
Modified:
tomcat/tc7.0.x/trunk/modules/jdbc-pool/src/main/java/org/apache/tomcat/jdbc/pool/FairBlockingQueue.java
Modified:
tomcat/tc7.0.x/trunk/modules/jdbc-pool/src/main/java/org/apache/tomcat/jdbc/pool/FairBlockingQueue.java
URL:
http://svn.apache.org/viewvc/tomcat/tc7.0.x/trunk/modules/jdbc-pool/src/main/java/org/apache/tomcat/jdbc/pool/FairBlockingQueue.java?rev=1613137&r1=1613136&r2=1613137&view=diff
==============================================================================
---
tomcat/tc7.0.x/trunk/modules/jdbc-pool/src/main/java/org/apache/tomcat/jdbc/pool/FairBlockingQueue.java
(original)
+++
tomcat/tc7.0.x/trunk/modules/jdbc-pool/src/main/java/org/apache/tomcat/jdbc/pool/FairBlockingQueue.java
Thu Jul 24 14:00:38 2014
@@ -148,14 +148,36 @@ public class FairBlockingQueue<E> implem
//unlock the global lock
lock.unlock();
//wait for the specified timeout
- if (!c.await(timeout, unit)) {
- //if we timed out, remove ourselves from the waitlist
+ boolean didtimeout = true;
+ InterruptedException interruptedException = null;
+ try {
+ //wait for the specified timeout
+ didtimeout = !c.await(timeout, unit);
+ } catch (InterruptedException ix) {
+ interruptedException = ix;
+ }
+ if (didtimeout) {
+ //if we timed out, or got interrupted
+ // remove ourselves from the waitlist
lock.lock();
- waiters.remove(c);
- lock.unlock();
+ try {
+ waiters.remove(c);
+ } finally {
+ lock.unlock();
+ }
}
//return the item we received, can be null if we timed out
result = c.getItem();
+ if (null!=interruptedException) {
+ //we got interrupted
+ if (null!=result) {
+ //we got a result - clear the interrupt status
+ //don't propagate cause we have removed a connection
from pool
+ Thread.interrupted();
+ } else {
+ throw interruptedException;
+ }
+ }
} else {
//we have an object, release
lock.unlock();
Added:
tomcat/tc7.0.x/trunk/modules/jdbc-pool/src/test/java/org/apache/tomcat/jdbc/bugs/Bug53367.java
URL:
http://svn.apache.org/viewvc/tomcat/tc7.0.x/trunk/modules/jdbc-pool/src/test/java/org/apache/tomcat/jdbc/bugs/Bug53367.java?rev=1613137&view=auto
==============================================================================
---
tomcat/tc7.0.x/trunk/modules/jdbc-pool/src/test/java/org/apache/tomcat/jdbc/bugs/Bug53367.java
(added)
+++
tomcat/tc7.0.x/trunk/modules/jdbc-pool/src/test/java/org/apache/tomcat/jdbc/bugs/Bug53367.java
Thu Jul 24 14:00:38 2014
@@ -0,0 +1,163 @@
+package org.apache.tomcat.jdbc.bugs;
+
+
+
+import org.apache.tomcat.jdbc.test.DefaultProperties;
+import org.junit.Assert;
+import org.apache.tomcat.jdbc.pool.ConnectionPool;
+import org.apache.tomcat.jdbc.pool.DataSource;
+import org.apache.tomcat.jdbc.pool.PoolExhaustedException;
+import org.apache.tomcat.jdbc.pool.PoolProperties;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.ArrayBlockingQueue;
+
+@RunWith(Parameterized.class)
+public class Bug53367 {
+
+ private boolean fairQueue;
+
+ public Bug53367(boolean fair) {
+ this.fairQueue = fair;
+ }
+
+ @Parameterized.Parameters
+ public static Collection parameters() {
+ return Arrays.asList(new Object[][]{
+ new Object[] {Boolean.TRUE},
+ new Object[] {Boolean.FALSE},
+ });
+ }
+
+ @Test
+ public void testPool() throws SQLException, InterruptedException {
+ DriverManager.setLoginTimeout(1);
+ PoolProperties poolProperties = new DefaultProperties();
+ int threadsCount = 3;
+ poolProperties.setMaxActive(threadsCount);
+ poolProperties.setMaxIdle(threadsCount);
+ poolProperties.setMinIdle(0);
+ poolProperties.setMaxWait(5000);
+ poolProperties.setInitialSize(0);
+ poolProperties.setRemoveAbandoned(true);
+ poolProperties.setRemoveAbandonedTimeout(300);
+ poolProperties.setRollbackOnReturn(true);
+ poolProperties.setFairQueue(fairQueue);
+ final DataSource ds = new DataSource(poolProperties);
+
+ final CountDownLatch openedLatch = new CountDownLatch(threadsCount);
+ final CountDownLatch closedLatch = new CountDownLatch(threadsCount);
+ final CountDownLatch toCloseLatch = new CountDownLatch(1);
+
+ for (int i = 0; i < threadsCount; i++) {
+ new Thread(new Runnable() {
+ @Override
+ public void run() {
+ try {
+ Connection connection = ds.getConnection();
+ openedLatch.countDown();
+
+ toCloseLatch.await();
+ connection.close();
+
+ closedLatch.countDown();
+
+ } catch (Exception e) {
+ System.err.println("Step 1:"+e.getMessage());
+ }
+ }
+ }).start();
+ }
+
+ openedLatch.await();
+ ConnectionPool pool = ds.getPool();
+ //Now we have 3 initialized busy connections
+ Assert.assertEquals(0, pool.getIdle());
+ Assert.assertEquals(threadsCount, pool.getActive());
+ Assert.assertEquals(threadsCount, pool.getSize());
+
+ List<Thread> threads = new ArrayList<Thread>();
+ for (int i = 0; i < threadsCount; i++) {
+ Thread thread = new Thread(new Runnable() {
+ @Override
+ public void run() {
+ try {
+ ds.getConnection();
+ } catch (Exception e) {
+ System.err.println("Step 2:"+e.getMessage());
+ }
+ }
+ });
+ thread.start();
+ threads.add(thread);
+ }
+ for (Thread thread : threads) {
+ thread.interrupt();
+ }
+ for (Thread thread : threads) {
+ thread.join();
+ }
+ //Still 3 active connections
+ Assert.assertEquals(0, pool.getIdle());
+ Assert.assertEquals(threadsCount, pool.getActive());
+ Assert.assertEquals(threadsCount, pool.getSize());
+
+ toCloseLatch.countDown();
+ closedLatch.await();
+
+ //Here comes the bug! No more active connections and unable to
establish new connections.
+
+ Assert.assertEquals(threadsCount, pool.getIdle()); // <-- Should be
threadsCount (3) here
+ Assert.assertEquals(0, pool.getActive());
+ Assert.assertEquals(threadsCount, pool.getSize());
+
+ final AtomicInteger failedCount = new AtomicInteger();
+ final ArrayBlockingQueue<Connection> cons = new
ArrayBlockingQueue<Connection>(threadsCount);
+ threads.clear();
+ for (int i = 0; i < threadsCount; i++) {
+ Thread thread = new Thread(new Runnable() {
+ @Override
+ public void run() {
+ try {
+ cons.add(ds.getConnection());
+ } catch (PoolExhaustedException e) {
+ failedCount.incrementAndGet();
+ System.err.println("Step 3:"+e.getMessage());
+ } catch (Exception e) {
+ System.err.println("Step 4:"+e.getMessage());
+ throw new RuntimeException(e);
+ }
+ }
+ });
+ thread.start();
+ threads.add(thread);
+ }
+
+ for (Thread thread : threads) {
+ thread.join();
+ }
+ Assert.assertEquals(0, failedCount.get());
+
+ Assert.assertEquals(0, pool.getIdle());
+ Assert.assertEquals(threadsCount, pool.getActive());
+ Assert.assertEquals(threadsCount, pool.getSize());
+ for (Connection con : cons) {
+ con.close();
+ }
+ Assert.assertEquals(threadsCount, pool.getIdle());
+ Assert.assertEquals(0, pool.getActive());
+ Assert.assertEquals(threadsCount, pool.getSize());
+ }
+}
\ No newline at end of file
Propchange:
tomcat/tc7.0.x/trunk/modules/jdbc-pool/src/test/java/org/apache/tomcat/jdbc/bugs/Bug53367.java
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