Author: markt
Date: Mon Dec  8 13:28:01 2014
New Revision: 1643815

URL: http://svn.apache.org/r1643815
Log:
Update fork of Apache Commons Pool2 to latest trunk to pick up fixes including 
one for a potential infinite loop.
Modified:
    tomcat/tc8.0.x/trunk/   (props changed)
    tomcat/tc8.0.x/trunk/java/org/apache/tomcat/dbcp/pool2/   (props changed)
    
tomcat/tc8.0.x/trunk/java/org/apache/tomcat/dbcp/pool2/impl/BaseGenericObjectPool.java
    
tomcat/tc8.0.x/trunk/java/org/apache/tomcat/dbcp/pool2/impl/DefaultPooledObject.java
    
tomcat/tc8.0.x/trunk/java/org/apache/tomcat/dbcp/pool2/impl/LinkedBlockingDeque.java
    tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml

Propchange: tomcat/tc8.0.x/trunk/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Mon Dec  8 13:28:01 2014
@@ -1 +1 @@
-/tomcat/trunk:1636524,1637156,1637176,1637188,1637331,1637684,1637695,1638720-1638725,1639653,1640010,1640084,1640088,1640275,1640322,1640347,1640361,1640365,1640403,1640410,1640652,1640655-1640658,1640688,1640700-1640883,1640903,1640976,1640978,1641000,1641026,1641038-1641039,1641051-1641052,1641058,1641064,1641300,1641369,1641374,1641380,1641486,1641634,1641656-1641692,1641704,1641707-1641718,1641720-1641722,1641735,1641981,1642554,1642564,1642595,1642606,1642668,1642679,1642697,1642699,1643002,1643045,1643054-1643055,1643066,1643121,1643206,1643209-1643210,1643216,1643249,1643270,1643283,1643309-1643310,1643323,1643365-1643366,1643370-1643371,1643465,1643474,1643570,1643634,1643649,1643651,1643654,1643675,1643731,1643733-1643734,1643761,1643766
+/tomcat/trunk:1636524,1637156,1637176,1637188,1637331,1637684,1637695,1638720-1638725,1639653,1640010,1640084,1640088,1640275,1640322,1640347,1640361,1640365,1640403,1640410,1640652,1640655-1640658,1640688,1640700-1640883,1640903,1640976,1640978,1641000,1641026,1641038-1641039,1641051-1641052,1641058,1641064,1641300,1641369,1641374,1641380,1641486,1641634,1641656-1641692,1641704,1641707-1641718,1641720-1641722,1641735,1641981,1642554,1642564,1642595,1642606,1642668,1642679,1642697,1642699,1643002,1643045,1643054-1643055,1643066,1643121,1643206,1643209-1643210,1643216,1643249,1643270,1643283,1643309-1643310,1643323,1643365-1643366,1643370-1643371,1643465,1643474,1643570,1643634,1643649,1643651,1643654,1643675,1643731,1643733-1643734,1643761,1643766,1643814

Propchange: tomcat/tc8.0.x/trunk/java/org/apache/tomcat/dbcp/pool2/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Mon Dec  8 13:28:01 2014
@@ -1 +1,2 @@
-/commons/proper/pool/trunk/src/main/java/org/apache/commons/pool2:1593516-1627271
+/commons/proper/pool/trunk/src/main/java/org/apache/commons/pool2:1593516-1643813
+/tomcat/trunk/java/org/apache/tomcat/dbcp/pool2:1643814

Modified: 
tomcat/tc8.0.x/trunk/java/org/apache/tomcat/dbcp/pool2/impl/BaseGenericObjectPool.java
URL: 
http://svn.apache.org/viewvc/tomcat/tc8.0.x/trunk/java/org/apache/tomcat/dbcp/pool2/impl/BaseGenericObjectPool.java?rev=1643815&r1=1643814&r2=1643815&view=diff
==============================================================================
--- 
tomcat/tc8.0.x/trunk/java/org/apache/tomcat/dbcp/pool2/impl/BaseGenericObjectPool.java
 (original)
+++ 
tomcat/tc8.0.x/trunk/java/org/apache/tomcat/dbcp/pool2/impl/BaseGenericObjectPool.java
 Mon Dec  8 13:28:01 2014
@@ -111,8 +111,7 @@ public abstract class BaseGenericObjectP
     private final StatsStore activeTimes = new 
StatsStore(MEAN_TIMING_STATS_CACHE_SIZE);
     private final StatsStore idleTimes = new 
StatsStore(MEAN_TIMING_STATS_CACHE_SIZE);
     private final StatsStore waitTimes = new 
StatsStore(MEAN_TIMING_STATS_CACHE_SIZE);
-    private final Object maxBorrowWaitTimeMillisLock = new Object();
-    private volatile long maxBorrowWaitTimeMillis = 0; // 
@GuardedBy("maxBorrowWaitTimeMillisLock")
+    private final AtomicLong maxBorrowWaitTimeMillis = new AtomicLong(0L);
     private volatile SwallowedExceptionListener swallowedExceptionListener = 
null;
 
 
@@ -809,7 +808,7 @@ public abstract class BaseGenericObjectP
      * @return maximum wait time in milliseconds since the pool was created
      */
     public final long getMaxBorrowWaitTimeMillis() {
-        return maxBorrowWaitTimeMillis;
+        return maxBorrowWaitTimeMillis.get();
     }
 
     /**
@@ -873,11 +872,15 @@ public abstract class BaseGenericObjectP
         borrowedCount.incrementAndGet();
         idleTimes.add(p.getIdleTimeMillis());
         waitTimes.add(waitTime);
-        synchronized (maxBorrowWaitTimeMillisLock) {
-            if (waitTime > maxBorrowWaitTimeMillis) {
-                maxBorrowWaitTimeMillis = waitTime;
+
+        // lock-free optimistic-locking maximum
+        long currentMax;
+        do {
+            currentMax = maxBorrowWaitTimeMillis.get();
+            if (currentMax >= waitTime) {
+                break;
             }
-        }
+        } while (!maxBorrowWaitTimeMillis.compareAndSet(currentMax, waitTime));
     }
 
     /**
@@ -1039,12 +1042,21 @@ public abstract class BaseGenericObjectP
         }
     }
 
+    /**
+     * Maintains a cache of values for a single metric and reports
+     * statistics on the cached values.
+     */
     private class StatsStore {
 
         private final AtomicLong values[];
         private final int size;
         private int index;
 
+        /**
+         * Create a StatsStore with the given cache size.
+         *
+         * @param size number of values to maintain in the cache.
+         */
         public StatsStore(int size) {
             this.size = size;
             values = new AtomicLong[size];
@@ -1053,6 +1065,12 @@ public abstract class BaseGenericObjectP
             }
         }
 
+        /**
+         * Adds a value to the cache.  If the cache is full, one of the
+         * existing values is replaced by the new value.
+         *
+         * @param value new value to add to the cache.
+         */
         public synchronized void add(long value) {
             values[index].set(value);
             index++;
@@ -1061,6 +1079,11 @@ public abstract class BaseGenericObjectP
             }
         }
 
+        /**
+         * Returns the mean of the cached values.
+         *
+         * @return the mean of the cache, truncated to long
+         */
         public long getMean() {
             double result = 0;
             int counter = 0;
@@ -1073,7 +1096,6 @@ public abstract class BaseGenericObjectP
                 }
             }
             return (long) result;
-
         }
     }
 }

Modified: 
tomcat/tc8.0.x/trunk/java/org/apache/tomcat/dbcp/pool2/impl/DefaultPooledObject.java
URL: 
http://svn.apache.org/viewvc/tomcat/tc8.0.x/trunk/java/org/apache/tomcat/dbcp/pool2/impl/DefaultPooledObject.java?rev=1643815&r1=1643814&r2=1643815&view=diff
==============================================================================
--- 
tomcat/tc8.0.x/trunk/java/org/apache/tomcat/dbcp/pool2/impl/DefaultPooledObject.java
 (original)
+++ 
tomcat/tc8.0.x/trunk/java/org/apache/tomcat/dbcp/pool2/impl/DefaultPooledObject.java
 Mon Dec  8 13:28:01 2014
@@ -289,7 +289,7 @@ public class DefaultPooledObject<T> impl
         private static final long serialVersionUID = 7398692158058772916L;
 
         /** Date format */
-        //@GuardedBy("this")
+        //@GuardedBy("format")
         private static final SimpleDateFormat format = new SimpleDateFormat
             ("'Pooled object created' yyyy-MM-dd HH:mm:ss Z " +
              "'by the following code has not been returned to the pool:'");

Modified: 
tomcat/tc8.0.x/trunk/java/org/apache/tomcat/dbcp/pool2/impl/LinkedBlockingDeque.java
URL: 
http://svn.apache.org/viewvc/tomcat/tc8.0.x/trunk/java/org/apache/tomcat/dbcp/pool2/impl/LinkedBlockingDeque.java?rev=1643815&r1=1643814&r2=1643815&view=diff
==============================================================================
--- 
tomcat/tc8.0.x/trunk/java/org/apache/tomcat/dbcp/pool2/impl/LinkedBlockingDeque.java
 (original)
+++ 
tomcat/tc8.0.x/trunk/java/org/apache/tomcat/dbcp/pool2/impl/LinkedBlockingDeque.java
 Mon Dec  8 13:28:01 2014
@@ -1226,23 +1226,33 @@ class LinkedBlockingDeque<E> extends Abs
         }
 
         /**
+         * Returns the successor node of the given non-null, but
+         * possibly previously deleted, node.
+         */
+        private Node<E> succ(Node<E> n) {
+            // Chains of deleted nodes ending in null or self-links
+            // are possible if multiple interior nodes are removed.
+            for (;;) {
+                Node<E> s = nextNode(n);
+                if (s == null)
+                    return null;
+                else if (s.item != null)
+                    return s;
+                else if (s == n)
+                    return firstNode();
+                else
+                    n = s;
+            }
+        }
+
+        /**
          * Advances next.
          */
         void advance() {
             lock.lock();
             try {
                 // assert next != null;
-                Node<E> s = nextNode(next);
-                if (s == next) {
-                    next = firstNode();
-                } else {
-                    // Skip over removed nodes.
-                    // May be necessary if multiple interior Nodes are removed.
-                    while (s != null && s.item == null) {
-                        s = nextNode(s);
-                    }
-                    next = s;
-                }
+                next = succ(next);
                 nextItem = next == null ? null : next.item;
             } finally {
                 lock.unlock();

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=1643815&r1=1643814&r2=1643815&view=diff
==============================================================================
--- tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml (original)
+++ tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml Mon Dec  8 13:28:01 2014
@@ -243,6 +243,11 @@
         project that uses Java 7 compliance settings instead of workspace-wide
         defaults. (kkolinko)
       </fix>
+     <fix>
+        Update the package renamed copy of Apache Commons Pool 2 to revision
+        1643813 to pick up additional fixes since the 2.2 release including
+        one for a possible infinite loop. (markt)
+      </fix>
     </changelog>
   </subsection>
 </section>



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