Implementation of the synchronization mechanism:
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objects that wish to collaborate implement Updatable interface:
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getStateUpdate(int feature, DataOutputStream update)
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updateState( int feature, DataInputStream update)
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feature is a particular feature which is updated
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when state of an object changes and synchronization is needed, object notifies the synchronization mechanism about the type of change by posting event to the Synchronizer:
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new UpdateEvent( Updatable this, int feature)
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special feature values UPDATE_CREATE, UPDATE_DELETE are recognized
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the rest is taken care by the Synchronizer
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