<body>
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default implementation of process execution in {@link org.jbpm.pvm.internal.model.ExecutionImpl}
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based on {@link org.jbpm.pvm.internal.model.AtomicOperation}s
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<h3>Bidirectional relations</h3>
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<p>In this process model thoughout the pvm codebase, there are several bidirectional
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relations. By convention, the bidirectional relations are maintained on the many side.
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This means that when you call for example {@link org.jbpm.pvm.internal.model.ProcessDefinitionImpl#addActivity(org.jbpm.pvm.internal.model.ActivityImpl)}, that
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method will also update the inverse pointer by invoking the
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{@link org.jbpm.pvm.internal.model.ActivityImpl#setProcessDefinition(org.jbpm.pvm.internal.model.ProcessDefinitionImpl)} setter. Setter methods will be plain setter
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methods and they will NOT update the inverse reference. (that would cause
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an infinite loop).
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</p>
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<p>In the same spirit, there is the convention that the many side of bidirection
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relations provide factory methods for the related objects. Those factory methods
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will also establish the bidirectional relation. E.g. {@link org.jbpm.pvm.internal.model.ProcessDefinitionImpl#createActivity(String)}.
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</p>
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</body>
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