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Added condition variable and timeout to ObjectPool::borrowObject/returnObject to block caller until an object is available.
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@ -22,6 +22,7 @@
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#include "Poco/Poco.h"
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#include "Poco/Mutex.h"
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#include "Poco/Condition.h"
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#include "Poco/AutoPtr.h"
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#include "Poco/SharedPtr.h"
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#include <vector>
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@ -157,7 +158,7 @@ class ObjectPool
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/// removed from the pool, activated (using the factory) and returned.
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/// - Otherwise, if the peak capacity of the pool has not yet been reached,
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/// a new object is created and activated, using the object factory, and returned.
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/// - If the peak capacity has already been reached, null is returned.
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/// - If the peak capacity has already been reached, null is returned after timeout.
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///
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/// When an object is returned to the pool:
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/// - If the object is valid (checked by calling validateObject()
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@ -207,33 +208,47 @@ public:
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}
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}
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P borrowObject()
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P borrowObject(long timeoutMilliseconds = 0)
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/// Obtains an object from the pool, or creates a new object if
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/// possible.
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///
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/// Returns null if no object is available.
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/// Returns null if no object is available after timeout.
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///
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/// If activating the object fails, the object is destroyed and
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/// the exception is passed on to the caller.
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{
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Poco::FastMutex::ScopedLock lock(_mutex);
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if (!_pool.empty())
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{
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P pObject = _pool.back();
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_pool.pop_back();
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return activateObject(pObject);
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}
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else if (_size < _peakCapacity)
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if (_size >= _peakCapacity)
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{
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P pObject = _factory.createObject();
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activateObject(pObject);
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_size++;
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return pObject;
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if (timeoutMilliseconds == 0)
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{
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return 0;
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}
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while (_size >= _peakCapacity)
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{
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if ( !_availableCondition.tryWait(_mutex, timeoutMilliseconds))
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{
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// timeout
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return 0;
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}
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}
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}
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else return 0;
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// _size < _peakCapacity
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P pObject = _factory.createObject();
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activateObject(pObject);
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_size++;
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return pObject;
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}
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void returnObject(P pObject)
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/// Returns an object to the pool.
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{
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@ -250,6 +265,7 @@ public:
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{
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_factory.destroyObject(pObject);
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_size--;
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_availableCondition.signal();
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}
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}
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else
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@ -308,6 +324,7 @@ private:
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std::size_t _size;
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std::vector<P> _pool;
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mutable Poco::FastMutex _mutex;
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Poco::Condition _availableCondition;
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};
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@ -77,9 +77,9 @@ class PooledConnection
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/// Helper class for borrowing and returning a connection automatically from a pool.
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{
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public:
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PooledConnection(Poco::ObjectPool<Connection, Connection::Ptr>& pool) : _pool(pool)
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PooledConnection(Poco::ObjectPool<Connection, Connection::Ptr>& pool, long timeoutMilliseconds = 0) : _pool(pool)
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{
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_connection = _pool.borrowObject();
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_connection = _pool.borrowObject(timeoutMilliseconds);
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}
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virtual ~PooledConnection()
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