Initially split utility.h to multiple files in util/

src/util/container.h

@@ -0,0 +1,305 @@
+/*
+Minetest-c55
+Copyright (C) 2010-2012 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#ifndef UTIL_CONTAINER_HEADER
+#define UTIL_CONTAINER_HEADER
+
+#include "../irrlichttypes.h"
+#include <jmutex.h>
+#include <jmutexautolock.h>
+#include "../porting.h" // For sleep_ms
+
+/*
+	Queue with unique values with fast checking of value existence
+*/
+
+template<typename Value>
+class UniqueQueue
+{
+public:
+	
+	/*
+		Does nothing if value is already queued.
+		Return value:
+			true: value added
+			false: value already exists
+	*/
+	bool push_back(Value value)
+	{
+		// Check if already exists
+		if(m_map.find(value) != NULL)
+			return false;
+
+		// Add
+		m_map.insert(value, 0);
+		m_list.push_back(value);
+		
+		return true;
+	}
+
+	Value pop_front()
+	{
+		typename core::list<Value>::Iterator i = m_list.begin();
+		Value value = *i;
+		m_map.remove(value);
+		m_list.erase(i);
+		return value;
+	}
+
+	u32 size()
+	{
+		assert(m_list.size() == m_map.size());
+		return m_list.size();
+	}
+
+private:
+	core::map<Value, u8> m_map;
+	core::list<Value> m_list;
+};
+
+#if 1
+template<typename Key, typename Value>
+class MutexedMap
+{
+public:
+	MutexedMap()
+	{
+		m_mutex.Init();
+		assert(m_mutex.IsInitialized());
+	}
+	
+	void set(const Key &name, const Value &value)
+	{
+		JMutexAutoLock lock(m_mutex);
+
+		m_values[name] = value;
+	}
+	
+	bool get(const Key &name, Value *result)
+	{
+		JMutexAutoLock lock(m_mutex);
+
+		typename core::map<Key, Value>::Node *n;
+		n = m_values.find(name);
+
+		if(n == NULL)
+			return false;
+		
+		if(result != NULL)
+			*result = n->getValue();
+			
+		return true;
+	}
+
+private:
+	core::map<Key, Value> m_values;
+	JMutex m_mutex;
+};
+#endif
+
+/*
+	Generates ids for comparable values.
+	Id=0 is reserved for "no value".
+
+	Is fast at:
+	- Returning value by id (very fast)
+	- Returning id by value
+	- Generating a new id for a value
+
+	Is not able to:
+	- Remove an id/value pair (is possible to implement but slow)
+*/
+template<typename T>
+class MutexedIdGenerator
+{
+public:
+	MutexedIdGenerator()
+	{
+		m_mutex.Init();
+		assert(m_mutex.IsInitialized());
+	}
+	
+	// Returns true if found
+	bool getValue(u32 id, T &value)
+	{
+		if(id == 0)
+			return false;
+		JMutexAutoLock lock(m_mutex);
+		if(m_id_to_value.size() < id)
+			return false;
+		value = m_id_to_value[id-1];
+		return true;
+	}
+	
+	// If id exists for value, returns the id.
+	// Otherwise generates an id for the value.
+	u32 getId(const T &value)
+	{
+		JMutexAutoLock lock(m_mutex);
+		typename core::map<T, u32>::Node *n;
+		n = m_value_to_id.find(value);
+		if(n != NULL)
+			return n->getValue();
+		m_id_to_value.push_back(value);
+		u32 new_id = m_id_to_value.size();
+		m_value_to_id.insert(value, new_id);
+		return new_id;
+	}
+
+private:
+	JMutex m_mutex;
+	// Values are stored here at id-1 position (id 1 = [0])
+	core::array<T> m_id_to_value;
+	core::map<T, u32> m_value_to_id;
+};
+
+/*
+	FIFO queue (well, actually a FILO also)
+*/
+template<typename T>
+class Queue
+{
+public:
+	void push_back(T t)
+	{
+		m_list.push_back(t);
+	}
+	
+	T pop_front()
+	{
+		if(m_list.size() == 0)
+			throw ItemNotFoundException("Queue: queue is empty");
+
+		typename core::list<T>::Iterator begin = m_list.begin();
+		T t = *begin;
+		m_list.erase(begin);
+		return t;
+	}
+	T pop_back()
+	{
+		if(m_list.size() == 0)
+			throw ItemNotFoundException("Queue: queue is empty");
+
+		typename core::list<T>::Iterator last = m_list.getLast();
+		T t = *last;
+		m_list.erase(last);
+		return t;
+	}
+
+	u32 size()
+	{
+		return m_list.size();
+	}
+
+protected:
+	core::list<T> m_list;
+};
+
+/*
+	Thread-safe FIFO queue (well, actually a FILO also)
+*/
+
+template<typename T>
+class MutexedQueue
+{
+public:
+	MutexedQueue()
+	{
+		m_mutex.Init();
+	}
+	u32 size()
+	{
+		JMutexAutoLock lock(m_mutex);
+		return m_list.size();
+	}
+	void push_back(T t)
+	{
+		JMutexAutoLock lock(m_mutex);
+		m_list.push_back(t);
+	}
+	T pop_front(u32 wait_time_max_ms=0)
+	{
+		u32 wait_time_ms = 0;
+
+		for(;;)
+		{
+			{
+				JMutexAutoLock lock(m_mutex);
+
+				if(m_list.size() > 0)
+				{
+					typename core::list<T>::Iterator begin = m_list.begin();
+					T t = *begin;
+					m_list.erase(begin);
+					return t;
+				}
+
+				if(wait_time_ms >= wait_time_max_ms)
+					throw ItemNotFoundException("MutexedQueue: queue is empty");
+			}
+
+			// Wait a while before trying again
+			sleep_ms(10);
+			wait_time_ms += 10;
+		}
+	}
+	T pop_back(u32 wait_time_max_ms=0)
+	{
+		u32 wait_time_ms = 0;
+
+		for(;;)
+		{
+			{
+				JMutexAutoLock lock(m_mutex);
+
+				if(m_list.size() > 0)
+				{
+					typename core::list<T>::Iterator last = m_list.getLast();
+					T t = *last;
+					m_list.erase(last);
+					return t;
+				}
+
+				if(wait_time_ms >= wait_time_max_ms)
+					throw ItemNotFoundException("MutexedQueue: queue is empty");
+			}
+
+			// Wait a while before trying again
+			sleep_ms(10);
+			wait_time_ms += 10;
+		}
+	}
+
+	JMutex & getMutex()
+	{
+		return m_mutex;
+	}
+
+	core::list<T> & getList()
+	{
+		return m_list;
+	}
+
+protected:
+	JMutex m_mutex;
+	core::list<T> m_list;
+};
+
+#endif
+