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| -rw-r--r-- | include/comphelper/interfacecontainer3.hxx | 380 |
1 files changed, 380 insertions, 0 deletions
diff --git a/include/comphelper/interfacecontainer3.hxx b/include/comphelper/interfacecontainer3.hxx new file mode 100644 index 0000000000..02f96658dc --- /dev/null +++ b/include/comphelper/interfacecontainer3.hxx @@ -0,0 +1,380 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ +#pragma once + +#include <sal/config.h> + +#include <com/sun/star/lang/EventObject.hpp> +#include <com/sun/star/lang/DisposedException.hpp> +#include <o3tl/cow_wrapper.hxx> +#include <vector> + +namespace com::sun::star::uno +{ +class XInterface; +} +namespace osl +{ +class Mutex; +} + +namespace comphelper +{ +template <class ListenerT> class OInterfaceContainerHelper3; +/** + This is the iterator of an OInterfaceContainerHelper3. Typically + one constructs an instance on the stack for one firing session. + It is not allowed to assign or copy an instance of this class. + + @tparam ListenerT UNO event listener type + @see OInterfaceContainerHelper3 + */ +template <class ListenerT> class OInterfaceIteratorHelper3 +{ +public: + /** + Create an iterator over the elements of the container. The iterator + copies the elements of the container. A change to the container + during the lifetime of an iterator is allowed and does not + affect the iterator-instance. The iterator and the container take cares + themself for concurrent access, no additional guarding is necessary. + + Remark: The copy is on demand. The iterator copy the elements only if the container + change the contents... + + @param rCont the container of the elements. + */ + OInterfaceIteratorHelper3(OInterfaceContainerHelper3<ListenerT>& rCont_) + : rCont(rCont_) + , maData(rCont.maData) + // const_cast so we don't trigger make_unique via o3tl::cow_wrapper::operator-> + , nRemain(std::as_const(maData)->size()) + { + } + + /** Return true, if there are more elements in the iterator. */ + bool hasMoreElements() const { return nRemain != 0; } + /** Return the next element of the iterator. Calling this method if + hasMoreElements() has returned false, is an error. + */ + css::uno::Reference<ListenerT> const& next(); + + /** Removes the current element (the last one returned by next()) + from the underlying container. Calling this method before + next() has been called or calling it twice with no next() + in between is an error. + */ + void remove(); + +private: + OInterfaceContainerHelper3<ListenerT>& rCont; + o3tl::cow_wrapper<std::vector<css::uno::Reference<ListenerT>>, + o3tl::ThreadSafeRefCountingPolicy> + maData; + sal_Int32 nRemain; + + OInterfaceIteratorHelper3(const OInterfaceIteratorHelper3&) = delete; + OInterfaceIteratorHelper3& operator=(const OInterfaceIteratorHelper3&) = delete; +}; + +template <class ListenerT> +const css::uno::Reference<ListenerT>& OInterfaceIteratorHelper3<ListenerT>::next() +{ + nRemain--; + return (*std::as_const(maData))[nRemain]; +} + +template <class ListenerT> void OInterfaceIteratorHelper3<ListenerT>::remove() +{ + rCont.removeInterface((*std::as_const(maData))[nRemain]); +} + +/** + A container of interfaces. To access the elements use an iterator. + This implementation is thread-safe. + + This is a copy of the code at include/comphelper/interfacecontainer2.hxx, + except that it is templatized on the type of the listener, which allows + some parts of the code to avoid doing an UNO_QUERY that can be expensive + in bulk. + + @tparam ListenerT UNO event listener type + @see OInterfaceIteratorHelper + */ +template <class ListenerT> class OInterfaceContainerHelper3 +{ +public: + /** + Create an interface container. + + @param rMutex the mutex to protect multi thread access. + The lifetime must be longer than the lifetime + of this object. + */ + inline OInterfaceContainerHelper3(::osl::Mutex& rMutex_); + + /** + Return the number of Elements in the container. Only useful if you have acquired + the mutex. + */ + sal_Int32 getLength() const; + + /** + Return all interfaces added to this container. + **/ + std::vector<css::uno::Reference<ListenerT>> getElements() const; + + /** Inserts an element into the container. The position is not specified, thus it is not + specified in which order events are fired. + + @attention + If you add the same interface more than once, then it will be added to the elements list + more than once and thus if you want to remove that interface from the list, you have to call + removeInterface() the same number of times. + In the latter case, you will also get events fired more than once (if the interface is a + listener interface). + + @param rxIFace + interface to be added; it is allowed to insert + the same interface more than once + @return + the new count of elements in the container + */ + sal_Int32 addInterface(const css::uno::Reference<ListenerT>& rxIFace); + /** Removes an element from the container. It uses interface equality to remove the interface. + + @param rxIFace + interface to be removed + @return + the new count of elements in the container + */ + sal_Int32 removeInterface(const css::uno::Reference<ListenerT>& rxIFace); + /** Return an interface by index + */ + const css::uno::Reference<ListenerT>& getInterface(sal_Int32 nIndex) const; + /** + Call disposing on all object in the container that + support XEventListener. Then clear the container. + */ + void disposeAndClear(const css::lang::EventObject& rEvt); + /** + Clears the container without calling disposing(). + */ + void clear(); + + /** Executes a functor for each contained listener of specified type, e.g. + <code>forEach<awt::XPaintListener>(...</code>. + + If a css::lang::DisposedException occurs which relates to + the called listener, then that listener is removed from the container. + + @tparam FuncT unary functor type, let your compiler deduce this for you + @param func unary functor object expecting an argument of type + css::uno::Reference<ListenerT> + */ + template <typename FuncT> inline void forEach(FuncT const& func); + + /** Calls a UNO listener method for each contained listener. + + The listener method must take a single argument of type EventT, + and return <code>void</code>. + + If a css::lang::DisposedException occurs which relates to + the called listener, then that listener is removed from the container. + + @tparam EventT event type, let your compiler deduce this for you + @param NotificationMethod + Pointer to a method of a ListenerT interface. + @param Event + Event to notify to all contained listeners + + Example: +@code + awt::PaintEvent aEvent( static_cast< cppu::OWeakObject* >( this ), ... ); + listeners.notifyEach( &XPaintListener::windowPaint, aEvent ); +@endcode + */ + template <typename EventT> + inline void notifyEach(void (SAL_CALL ListenerT::*NotificationMethod)(const EventT&), + const EventT& Event); + +private: + friend class OInterfaceIteratorHelper3<ListenerT>; + o3tl::cow_wrapper<std::vector<css::uno::Reference<ListenerT>>, + o3tl::ThreadSafeRefCountingPolicy> + maData; + ::osl::Mutex& mrMutex; + OInterfaceContainerHelper3(const OInterfaceContainerHelper3&) = delete; + OInterfaceContainerHelper3& operator=(const OInterfaceContainerHelper3&) = delete; + + static o3tl::cow_wrapper<std::vector<css::uno::Reference<ListenerT>>, + o3tl::ThreadSafeRefCountingPolicy>& + DEFAULT() + { + static o3tl::cow_wrapper<std::vector<css::uno::Reference<ListenerT>>, + o3tl::ThreadSafeRefCountingPolicy> + SINGLETON; + return SINGLETON; + } + +private: + template <typename EventT> class NotifySingleListener + { + private: + typedef void (SAL_CALL ListenerT::*NotificationMethod)(const EventT&); + NotificationMethod const m_pMethod; + const EventT& m_rEvent; + + public: + NotifySingleListener(NotificationMethod method, const EventT& event) + : m_pMethod(method) + , m_rEvent(event) + { + } + + void operator()(const css::uno::Reference<ListenerT>& listener) const + { + (listener.get()->*m_pMethod)(m_rEvent); + } + }; +}; + +template <class T> +inline OInterfaceContainerHelper3<T>::OInterfaceContainerHelper3(::osl::Mutex& rMutex_) + : maData(OInterfaceContainerHelper3<T>::DEFAULT()) + , mrMutex(rMutex_) +{ +} + +template <class T> +template <typename FuncT> +inline void OInterfaceContainerHelper3<T>::forEach(FuncT const& func) +{ + OInterfaceIteratorHelper3<T> iter(*this); + while (iter.hasMoreElements()) + { + auto xListener = iter.next(); + try + { + func(xListener); + } + catch (css::lang::DisposedException const& exc) + { + if (exc.Context == xListener) + iter.remove(); + } + } +} + +template <class ListenerT> +template <typename EventT> +inline void OInterfaceContainerHelper3<ListenerT>::notifyEach( + void (SAL_CALL ListenerT::*NotificationMethod)(const EventT&), const EventT& Event) +{ + forEach<NotifySingleListener<EventT>>(NotifySingleListener<EventT>(NotificationMethod, Event)); +} + +template <class ListenerT> sal_Int32 OInterfaceContainerHelper3<ListenerT>::getLength() const +{ + osl::MutexGuard aGuard(mrMutex); + return maData->size(); +} + +template <class ListenerT> +std::vector<css::uno::Reference<ListenerT>> +OInterfaceContainerHelper3<ListenerT>::getElements() const +{ + std::vector<css::uno::Reference<ListenerT>> rVec; + osl::MutexGuard aGuard(mrMutex); + rVec = *maData; + return rVec; +} + +template <class ListenerT> +sal_Int32 +OInterfaceContainerHelper3<ListenerT>::addInterface(const css::uno::Reference<ListenerT>& rListener) +{ + assert(rListener.is()); + osl::MutexGuard aGuard(mrMutex); + + maData->push_back(rListener); + return maData->size(); +} + +template <class ListenerT> +sal_Int32 OInterfaceContainerHelper3<ListenerT>::removeInterface( + const css::uno::Reference<ListenerT>& rListener) +{ + assert(rListener.is()); + osl::MutexGuard aGuard(mrMutex); + + // It is not valid to compare the pointer directly, but it's faster. + auto it = std::find_if(maData->begin(), maData->end(), + [&rListener](const css::uno::Reference<css::uno::XInterface>& rItem) { + return rItem.get() == rListener.get(); + }); + + // interface not found, use the correct compare method + if (it == maData->end()) + it = std::find(maData->begin(), maData->end(), rListener); + + if (it != maData->end()) + maData->erase(it); + + return maData->size(); +} + +template <class ListenerT> +const css::uno::Reference<ListenerT>& +OInterfaceContainerHelper3<ListenerT>::getInterface(sal_Int32 nIndex) const +{ + osl::MutexGuard aGuard(mrMutex); + + return (*maData)[nIndex]; +} + +template <class ListenerT> +void OInterfaceContainerHelper3<ListenerT>::disposeAndClear(const css::lang::EventObject& rEvt) +{ + osl::ClearableMutexGuard aGuard(mrMutex); + OInterfaceIteratorHelper3<ListenerT> aIt(*this); + maData->clear(); + aGuard.clear(); + while (aIt.hasMoreElements()) + { + try + { + aIt.next()->disposing(rEvt); + } + catch (css::uno::RuntimeException&) + { + // be robust, if e.g. a remote bridge has disposed already. + // there is no way to delegate the error to the caller :o(. + } + } +} + +template <class ListenerT> void OInterfaceContainerHelper3<ListenerT>::clear() +{ + osl::MutexGuard aGuard(mrMutex); + maData->clear(); +} +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |