Added condition variable and timeout to ObjectPool::borrowObject/returnObject to block caller until an object is available.

Foundation/include/Poco/ObjectPool.h

@@ -22,6 +22,7 @@
 
 #include "Poco/Poco.h"
 #include "Poco/Mutex.h"
+#include "Poco/Condition.h"
 #include "Poco/AutoPtr.h"
 #include "Poco/SharedPtr.h"
 #include <vector>
@@ -157,7 +158,7 @@ class ObjectPool
 	///     removed from the pool, activated (using the factory) and returned. 
 	///   - Otherwise, if the peak capacity of the pool has not yet been reached, 
 	///     a new object is created and activated, using the object factory, and returned. 
-	///   - If the peak capacity has already been reached, null is returned.
+	///   - If the peak capacity has already been reached, null is returned after timeout.
 	///
 	/// When an object is returned to the pool:
 	///   - If the object is valid (checked by calling validateObject()
@@ -207,11 +208,11 @@ public:
 		}
 	}
 		
-	P borrowObject()
+	P borrowObject(long timeoutMilliseconds = 0)
 		/// Obtains an object from the pool, or creates a new object if
 		/// possible.
 		///
-		/// Returns null if no object is available.
+		/// Returns null if no object is available after timeout.
 		///
 		/// If activating the object fails, the object is destroyed and
 		/// the exception is passed on to the caller.
@@ -224,15 +225,29 @@ public:
 			_pool.pop_back();
 			return activateObject(pObject);
 		}
-		else if (_size < _peakCapacity)
+
+		if (_size >= _peakCapacity)
 		{
+			if (timeoutMilliseconds == 0)
+			{
+				return 0;
+			}
+			while (_size >= _peakCapacity)
+			{
+				if ( !_availableCondition.tryWait(_mutex, timeoutMilliseconds))
+				{
+					// timeout
+					return 0;
+				}
+			}
+		}
+
+		// _size < _peakCapacity
 		P pObject = _factory.createObject();
 		activateObject(pObject);
 		_size++;
 		return pObject;
 	}
-		else return 0;
-	}
 
 	void returnObject(P pObject)
 		/// Returns an object to the pool.
@@ -250,6 +265,7 @@ public:
 			{
 				_factory.destroyObject(pObject);
 				_size--;
+				_availableCondition.signal();
 			}
 		}
 		else
@@ -308,6 +324,7 @@ private:
 	std::size_t _size;
 	std::vector<P> _pool;
 	mutable Poco::FastMutex _mutex;
+	Poco::Condition _availableCondition;
 };
 
 

MongoDB/include/Poco/MongoDB/PoolableConnectionFactory.h

@@ -77,9 +77,9 @@ class PooledConnection
 	/// Helper class for borrowing and returning a connection automatically from a pool.
 {
 public:
-	PooledConnection(Poco::ObjectPool<Connection, Connection::Ptr>& pool) : _pool(pool)
+	PooledConnection(Poco::ObjectPool<Connection, Connection::Ptr>& pool, long timeoutMilliseconds = 0) : _pool(pool)
 	{
-		_connection = _pool.borrowObject();
+		_connection = _pool.borrowObject(timeoutMilliseconds);
 	}
 
 	virtual ~PooledConnection()