Generic watching support classes.
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1573 a95241bf-73f2-0310-859d-f6bbb57e9c96
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//------------------------------------------------------------------------------
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// Copyright (c) 2001-2002, OpenBeOS
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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// File Name: EventMaskWatcher.cpp
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// Author: Ingo Weinhold (bonefish@users.sf.net)
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// Description: EventMaskWatcher is a Watcher extended by an event mask.
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// EventMaskWatcherFilter filters EventMaskWatchers with
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// respect to their event mask and a specific event.
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//------------------------------------------------------------------------------
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#include "EventMaskWatcher.h"
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// EventMaskWatcher
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// constructor
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EventMaskWatcher::EventMaskWatcher(const BMessenger &target, uint32 eventMask)
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: Watcher(target),
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fEventMask(eventMask)
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{
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}
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// EventMask
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uint32
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EventMaskWatcher::EventMask() const
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{
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return fEventMask;
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}
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// EventMaskWatcherFilter
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// constructor
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EventMaskWatcherFilter::EventMaskWatcherFilter(uint32 event)
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: WatcherFilter(),
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fEvent(event)
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{
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}
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// Filter
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bool
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EventMaskWatcherFilter::Filter(Watcher *watcher, BMessage *message)
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{
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EventMaskWatcher *emWatcher = dynamic_cast<EventMaskWatcher *>(watcher);
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return (emWatcher && (emWatcher->EventMask() & fEvent));
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}
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//------------------------------------------------------------------------------
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// Copyright (c) 2001-2002, OpenBeOS
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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// File Name: EventMaskWatcher.h
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// Author: Ingo Weinhold (bonefish@users.sf.net)
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// Description: EventMaskWatcher is a Watcher extended by an event mask.
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// EventMaskWatcherFilter filters EventMaskWatchers with
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// respect to their event mask and a specific event.
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//------------------------------------------------------------------------------
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#ifndef EVENT_MASK_WATCHER_H
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#define EVENT_MASK_WATCHER_H
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#include "Watcher.h"
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// EventMaskWatcher
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class EventMaskWatcher : public Watcher {
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public:
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EventMaskWatcher(const BMessenger &target, uint32 eventMask);
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uint32 EventMask() const;
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private:
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uint32 fEventMask;
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};
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// EventMaskWatcherFilter
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class EventMaskWatcherFilter : public WatcherFilter {
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public:
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EventMaskWatcherFilter(uint32 event);
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virtual bool Filter(Watcher *watcher, BMessage *message);
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private:
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uint32 fEvent;
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};
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#endif // EVENT_MASK_WATCHER_H
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//------------------------------------------------------------------------------
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// Copyright (c) 2001-2002, OpenBeOS
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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// File Name: Watcher.cpp
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// Author: Ingo Weinhold (bonefish@users.sf.net)
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// Description: A Watcher represents a target of a watching service.
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// A WatcherFilter represents a predicate on a Watcher.
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//------------------------------------------------------------------------------
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#include <Message.h>
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#include "Watcher.h"
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// Watcher
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// constructor
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Watcher::Watcher(const BMessenger &target)
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: fTarget(target)
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{
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}
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// destructor
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Watcher::~Watcher()
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{
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}
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// Target
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const BMessenger&
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Watcher::Target() const
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{
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return fTarget;
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}
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// SendMessage
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status_t
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Watcher::SendMessage(BMessage *message)
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{
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return fTarget.SendMessage(message, (BHandler*)NULL, 0);
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}
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// WatcherFilter
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// constructor
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WatcherFilter::WatcherFilter()
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{
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}
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// destructor
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WatcherFilter::~WatcherFilter()
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{
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}
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// Filter
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bool
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WatcherFilter::Filter(Watcher *watcher, BMessage *message)
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{
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return true;
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}
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//------------------------------------------------------------------------------
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// Copyright (c) 2001-2002, OpenBeOS
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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// File Name: Watcher.h
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// Author: Ingo Weinhold (bonefish@users.sf.net)
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// Description: A Watcher represents a target of a watching service.
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// A WatcherFilter represents a predicate on a Watcher.
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//------------------------------------------------------------------------------
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#ifndef WATCHER_H
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#define WATCHER_H
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#include <Messenger.h>
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// Watcher
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class Watcher {
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public:
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Watcher(const BMessenger &target);
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virtual ~Watcher();
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const BMessenger &Target() const;
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status_t SendMessage(BMessage *message);
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private:
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BMessenger fTarget;
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};
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// WatcherFilter
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class WatcherFilter {
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public:
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WatcherFilter();
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virtual ~WatcherFilter();
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virtual bool Filter(Watcher *watcher, BMessage *message);
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};
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#endif // WATCHER_H
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//------------------------------------------------------------------------------
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// Copyright (c) 2001-2002, OpenBeOS
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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// File Name: WatchingService.cpp
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// Author: Ingo Weinhold (bonefish@users.sf.net)
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// Description: Features everything needed to provide a watching service.
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//------------------------------------------------------------------------------
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#include <List.h>
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#include "Watcher.h"
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#include "WatchingService.h"
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// constructor
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WatchingService::WatchingService()
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: fWatchers()
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{
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}
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// destructor
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WatchingService::~WatchingService()
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{
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// delete the watchers
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for (watcher_map::iterator it = fWatchers.begin();
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it != fWatchers.end();
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++it) {
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delete it->second;
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}
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}
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// AddWatcher
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bool
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WatchingService::AddWatcher(Watcher *watcher)
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{
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bool result = (watcher);
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if (result) {
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RemoveWatcher(watcher->Target(), true);
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fWatchers[watcher->Target()] = watcher;
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}
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return result;
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}
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// AddWatcher
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bool
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WatchingService::AddWatcher(const BMessenger &target)
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{
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return AddWatcher(new(nothrow) Watcher(target));
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}
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// RemoveWatcher
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bool
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WatchingService::RemoveWatcher(Watcher *watcher, bool deleteWatcher)
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{
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return (watcher && RemoveWatcher(watcher->Target(), deleteWatcher));
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}
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// RemoveWatcher
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bool
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WatchingService::RemoveWatcher(const BMessenger &target, bool deleteWatcher)
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{
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watcher_map::iterator it = fWatchers.find(target);
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bool result = (it != fWatchers.end());
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if (result) {
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if (deleteWatcher)
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delete it->second;
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fWatchers.erase(it);
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}
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return result;
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}
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// NotifyWatchers
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void
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WatchingService::NotifyWatchers(BMessage *message, WatcherFilter *filter)
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{
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BList staleWatchers;
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// deliver the message
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for (watcher_map::iterator it = fWatchers.begin();
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it != fWatchers.end();
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++it) {
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Watcher *watcher = it->second;
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// TODO: If a watcher is invalid, but the filter never selects it, it will
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// not be removed.
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if (!filter || filter->Filter(watcher, message)) {
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status_t error = watcher->SendMessage(message);
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if (error != B_OK && error != B_WOULD_BLOCK)
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staleWatchers.AddItem(watcher);
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}
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}
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// remove the stale watchers
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for (int32 i = 0;
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Watcher *watcher = (Watcher*)staleWatchers.ItemAt(i);
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i++) {
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RemoveWatcher(watcher, true);
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}
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}
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@ -0,0 +1,56 @@
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//------------------------------------------------------------------------------
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// Copyright (c) 2001-2002, OpenBeOS
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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// File Name: WatchingService.h
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// Author: Ingo Weinhold (bonefish@users.sf.net)
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// Description: Features everything needed to provide a watching service.
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//------------------------------------------------------------------------------
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#ifndef WATCHING_SERVICE_H
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#define WATCHING_SERVICE_H
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#include <map>
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#include <Messenger.h>
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class Watcher;
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class WatcherFilter;
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class WatchingService {
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public:
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WatchingService();
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virtual ~WatchingService();
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bool AddWatcher(Watcher *watcher);
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bool AddWatcher(const BMessenger &target);
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bool RemoveWatcher(Watcher *watcher, bool deleteWatcher = true);
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bool RemoveWatcher(const BMessenger &target, bool deleteWatcher = true);
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void NotifyWatchers(BMessage *message, WatcherFilter *filter = NULL);
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private:
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typedef map<BMessenger,Watcher*> watcher_map;
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private:
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watcher_map fWatchers;
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};
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#endif // WATCHING_SERVICE_H
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