intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 132 insertions, 0 deletions

diff --git a/contrib/libs/poco/Foundation/include/Poco/ExpireStrategy.h b/contrib/libs/poco/Foundation/include/Poco/ExpireStrategy.h
new file mode 100644
index 0000000000..40e49eae8c
--- /dev/null
+++ b/contrib/libs/poco/Foundation/include/Poco/ExpireStrategy.h
@@ -0,0 +1,132 @@
+//
+// ExpireStrategy.h
+//
+// Library: Foundation
+// Package: Cache
+// Module:  ExpireStrategy
+//
+// Definition of the ExpireStrategy class.
+//
+// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_ExpireStrategy_INCLUDED
+#define Foundation_ExpireStrategy_INCLUDED
+
+
+#include "Poco/KeyValueArgs.h"
+#include "Poco/ValidArgs.h"
+#include "Poco/AbstractStrategy.h"
+#include "Poco/Bugcheck.h"
+#include "Poco/Timestamp.h"
+#include "Poco/EventArgs.h"
+#include <set>
+#include <map>
+
+
+namespace Poco {
+
+
+template < 
+	class TKey,
+	class TValue
+>
+class ExpireStrategy: public AbstractStrategy<TKey, TValue>
+	/// An ExpireStrategy implements time based expiration of cache entries
+{
+public:
+	typedef std::multimap<Timestamp, TKey>     TimeIndex;
+	typedef typename TimeIndex::iterator       IndexIterator;
+	typedef typename TimeIndex::const_iterator ConstIndexIterator;
+	typedef std::map<TKey, IndexIterator>      Keys;
+	typedef typename Keys::iterator            Iterator;
+
+public:
+	ExpireStrategy(Timestamp::TimeDiff expireTimeInMilliSec): _expireTime(expireTimeInMilliSec * 1000)
+		/// Create an expire strategy. Note that the smallest allowed caching time is 25ms.
+		/// Anything lower than that is not useful with current operating systems.
+	{
+		if (_expireTime < 25000) throw InvalidArgumentException("expireTime must be at least 25 ms");  
+	}
+
+	~ExpireStrategy()
+	{
+	}
+
+	void onAdd(const void*, const KeyValueArgs <TKey, TValue>& args)
+	{
+		Timestamp now;
+		typename TimeIndex::value_type tiValue(now, args.key());
+		IndexIterator it = _keyIndex.insert(tiValue);
+		typename Keys::value_type kValue(args.key(), it);
+		std::pair<Iterator, bool> stat = _keys.insert(kValue);
+		if (!stat.second)
+		{
+			_keyIndex.erase(stat.first->second);
+			stat.first->second = it;
+		}
+	}
+
+	void onRemove(const void*, const TKey& key)
+	{
+		Iterator it = _keys.find(key);
+		if (it != _keys.end())
+		{
+			_keyIndex.erase(it->second);
+			_keys.erase(it);
+		}
+	}
+
+	void onGet(const void*, const TKey& /*key*/)
+	{
+		// get triggers no changes in an expire
+	}
+
+	void onClear(const void*, const EventArgs& /*args*/)
+	{
+		_keys.clear();
+		_keyIndex.clear();
+	}
+
+	void onIsValid(const void*, ValidArgs<TKey>& args)
+	{
+		Iterator it = _keys.find(args.key());
+		if (it != _keys.end())
+		{
+			if (it->second->first.isElapsed(_expireTime))
+			{
+				args.invalidate();
+			}
+		}
+		else //not found: probably removed by onReplace
+			args.invalidate();
+	}
+
+	void onReplace(const void*, std::set<TKey>& elemsToRemove)
+	{
+		// Note: replace only informs the cache which elements
+		// it would like to remove!
+		// it does not remove them on its own!
+		IndexIterator it = _keyIndex.begin();
+		while (it != _keyIndex.end() && it->first.isElapsed(_expireTime))
+		{
+			elemsToRemove.insert(it->second);
+			++it;
+		}
+	}
+
+protected:
+	Timestamp::TimeDiff _expireTime;
+	Keys      _keys;     /// For faster replacement of keys, the iterator points to the _keyIndex map
+	TimeIndex _keyIndex; /// Maps time to key value
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_ExpireStrategy_INCLUDED