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9.2. Contributions
the identified requirements, this dissertation proposes an ownershipbased
metaobject protocol (OMOP) in Chapter 5.
Demonstrate Applicability The third and final research goal was to demonstrate
the applicability of the proposed OMOP. On the one hand, Chapter
6 needed to evaluate the OMOP’s capabilities as a unifying substrate.
Thus, it needed to demonstrate that the OMOP facilitates the implementation
of a wide range of concepts for concurrent programming. On the
other hand, in Chapter 8 it was the goal to show that the OMOP gives
rise to an efficient implementation. Thus, the evaluation needed to show
that by using the OMOP it is possible to implement concepts for concurrent
programming in a way that their performance is on par with
conventional implementations.
Two prototypes of the OMOP were implemented to support the thesis
statement and to achieve the research goals. The first implementation uses
AST transformation on top of an unchanged VM. The second implementation
adapts the bytecode semantics of an existing VM. Based on these implementations,
Chapter 6 evaluated the OMOP and Chapter 8 demonstrated its
applicability.
9.2. Contributions
This section recapitulates the main chapters of this dissertation so as to identify
the individual contributions of each of them.
• Chapter 2 discusses the widespread use of VMs as general purpose
platforms and identifies the need for a unifying abstractions to avoid
complex feature interaction in VMs that hinder extensibility and maintainability.
Furthermore, it revisits the reasons for the multicore revolution and concludes
that software developers need to pursue parallelism to achieve
the performance required for their applications. The vision of this dissertation
is that applications are built using the appropriate concurrent
and parallel programming techniques for, e. g., user interface and data
processing.
Moreover, the chapter defines the notions of concurrent programming and
parallel programming to enable a categorization of the corresponding programming
concepts based on their intent.
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