| [084729c] | 1 | /*
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| 2 | * Project: MoleCuilder
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| 3 | * Description: creates and alters molecular systems
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| 4 | * Copyright (C) 2010 University of Bonn. All rights reserved.
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| 5 | * Please see the LICENSE file or "Copyright notice" in builder.cpp for details.
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| 6 | */
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| 7 |
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| 8 | /**
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| 9 | * \file observer.dox
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| 10 | *
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| 11 | * Created on: Dec 1, 2011
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| 12 | * Author: heber
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| 13 | */
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| 14 |
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| 15 | /** \page pattern-observer
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| 16 | *
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| 17 | * Basic structure for the observer pattern
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| 18 | *
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| 19 | * Observers register themselves with the observables to be notified when something changes.
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| 20 | * In the Observable code that changes, attributes should be started with OBSERVE;. This macro
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| 21 | * locks the observer mechanism while changes are done. At the end of the scope in which the
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| 22 | * macro was placed the lock is released. When the last lock is released all changes are
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| 23 | * propagated to the observers.
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| 24 | *
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| 25 | * Each observerable can have sub-observables. When one of these sub-observables changes and
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| 26 | * notifies its observers the observable that contains them will also notify its observers.
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| 27 | * This passing on of updates is blocked, when the main-observable is in the process of
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| 28 | * updating many of its internal sub-observables. This means the update is not passed, if
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| 29 | * it is produced while the main-observable itself is within any Observation block.
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| 30 | *
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| 31 | * \section pattern-observer-howtos Howto
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| 32 | *
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| 33 | * Below you find various howtos to guide you through how to use the various
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| 34 | * observer patterns.
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| 35 | *
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| 36 | * \section pattern-observer-howtos-observer Observers
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| 37 | *
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| 38 | * \todo write howto for using an Observer
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| 39 | *
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| 40 | * \section pattern-observer-howtos-observables Observables
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| 41 | *
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| 42 | * \todo write howto for using an Observable
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| 43 | *
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| 44 | * \section pattern-observer-howtos-relay Relays
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| 45 | *
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| 46 | * Lets us assume that you want to observe all instances of class "foo".
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| 47 | * In order to create a Relay you have to do the following:
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| 48 | * -# Create a new class "bar" that inherits the Relay pattern.
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| 49 | * \code
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| 50 | * #include "CodePatterns/Relay.hpp"
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| 51 | * class bar : public Relay {
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| 52 | * ...
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| 53 | * };
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| 54 | * \endcode
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| 55 | * -# In the constructor bar::bar() create a Channels object for your Relay and
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| 56 | * add a channel for each of foo's channels, use foo's enum for this:
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| 57 | * \code
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| 58 | * bar::bar() {
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| 59 | * Channels *OurChannel = new Channels();
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| 60 | * NotificationChannels.insert( std::make_pair(this, OurChannel) );
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| 61 | * OurChannel->addChannel(foo::Notification1);
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| 62 | * OurChannel->addChannel(foo::Notification2);
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| 63 | * ...
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| 64 | * }
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| 65 | * \endcode
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| 66 | * -# Someplace else you have add all Observers that need to check on all
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| 67 | * instances of "foo" to be signed on.
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| 68 | * \code
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| 69 | * bar barInstance;
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| 70 | * ... someObserverInstance;
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| 71 | * barInstance.signOn(someObserverInstance);
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| 72 | * \endcode
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| 73 | * -# ... or maybe just for a specific channel of foo.
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| 74 | * \code
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| 75 | * bar barInstance;
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| 76 | * ... someObserverInstance;
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| 77 | * barInstance.signOn(someObserverInstance, foo::Notification1);
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| 78 | * \endcode
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| 79 | *
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| 80 | *
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| 81 | * \date 2011-12-01
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| 82 | */
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| 83 |
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