ModelView::ItemPool Class Reference

Provides registration of SessionItem pointers and their unique identifiers in global memory pool. More...

Public Member Functions
	ItemPool ()=default
	ItemPool (const ItemPool &)=delete
	ItemPool (ItemPool &&)=delete
SessionItem *	item_for_key (const identifier_type &key) const
identifier_type	key_for_item (const SessionItem *item) const
ItemPool &	operator= (const ItemPool &)=delete
ItemPool &	operator= (ItemPool &&)=delete
identifier_type	register_item (SessionItem *item, identifier_type key={})
size_t	size () const
void	unregister_item (SessionItem *item)

Private Attributes
std::map< const SessionItem *, identifier_type >	m_item_to_key
std::map< identifier_type, SessionItem * >	m_key_to_item

Detailed Description

Provides registration of SessionItem pointers and their unique identifiers in global memory pool.

Definition at line 29 of file itempool.h.

Constructor & Destructor Documentation

ItemPool() [1/3]

ModelView::ItemPool::ItemPool ( )

default

ItemPool() [2/3]

ModelView::ItemPool::ItemPool ( const ItemPool &  )

delete

ItemPool() [3/3]

ModelView::ItemPool::ItemPool ( ItemPool &&  )

delete

Member Function Documentation

item_for_key()

SessionItem * ItemPool::item_for_key

(

const identifier_type &

key

)

const

Definition at line 72 of file itempool.cpp.

{
    auto it = m_key_to_item.find(key);
    if (it != m_key_to_item.end())
        return it->second;
 
    return nullptr;
}

References m_key_to_item.

key_for_item()

identifier_type ItemPool::key_for_item

(

const SessionItem *

item

)

const

Definition at line 63 of file itempool.cpp.

{
    const auto it = m_item_to_key.find(item);
    if (it != m_item_to_key.end())
        return it->second;
 
    return {};
}

References m_item_to_key.

operator=() [1/2]

ItemPool& ModelView::ItemPool::operator= ( const ItemPool &  )

delete

operator=() [2/2]

ItemPool& ModelView::ItemPool::operator= ( ItemPool &&  )

delete

register_item()

identifier_type ItemPool::register_item	(	SessionItem *	item,
		identifier_type	key = {}
	)

Definition at line 28 of file itempool.cpp.

{
    if (m_item_to_key.find(item) != m_item_to_key.end())
        throw std::runtime_error("ItemPool::register_item() -> Attempt to register already "
                                 "registered item.");
 
    if (key.empty()) {
        key = UniqueIdGenerator::generate();
        while (m_key_to_item.find(key) != m_key_to_item.end())
            key = UniqueIdGenerator::generate(); // preventing improbable duplicates
    } else {
        if (m_key_to_item.find(key) != m_key_to_item.end())
            throw std::runtime_error(" ItemPool::register_item() -> Attempt to reuse existing key");
    }
 
    m_key_to_item.insert(std::make_pair(key, item));
    m_item_to_key.insert(std::make_pair(item, key));
 
    return key;
}

References ModelView::UniqueIdGenerator::generate(), m_item_to_key, and m_key_to_item.

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size()

size_t ItemPool::size

(

)

const

Definition at line 21 of file itempool.cpp.

{
    if (m_key_to_item.size() != m_item_to_key.size())
        throw std::runtime_error("Error in ItemPool: array size mismatch");
    return m_key_to_item.size();
}

References m_item_to_key, and m_key_to_item.

Referenced by TEST_F().

unregister_item()

void ItemPool::unregister_item

(

SessionItem *

item

)

Definition at line 50 of file itempool.cpp.

{
    auto it = m_item_to_key.find(item);
    if (it == m_item_to_key.end())
        throw std::runtime_error("ItemPool::deregister_item() -> Attempt to deregister "
                                 "non existing item.");
    auto key = it->second;
    m_item_to_key.erase(it);
 
    auto it2 = m_key_to_item.find(key);
    m_key_to_item.erase(it2);
}

References m_item_to_key, and m_key_to_item.

Member Data Documentation

m_item_to_key

std::map<const SessionItem*, identifier_type> ModelView::ItemPool::m_item_to_key

private

Definition at line 48 of file itempool.h.

Referenced by key_for_item(), register_item(), size(), and unregister_item().

m_key_to_item

std::map<identifier_type, SessionItem*> ModelView::ItemPool::m_key_to_item

private

Definition at line 47 of file itempool.h.

Referenced by item_for_key(), register_item(), size(), and unregister_item().

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The documentation for this class was generated from the following files:

• /home/www/ba/mvvm/model/mvvm/model/itempool.h
• /home/www/ba/mvvm/model/mvvm/model/itempool.cpp