Non‐functional information transmission patterns for distributed real‐time Java

Concurrency and Computation

et al. 2011

SUMMARYService-based approach has been successfully applied to distributed environments, modelling them as pieces of functionality that exchange information by means of messages in order to achieve a common goal. The advantages of this approach can be also be applied to distributed real-time systems, increasing their flexibility and allowing the creation of new brand applications from existing services in the system. If this is an online process, then time-bounded composition algorithms are needed to not jeopardize the performance of the whole system. Different composition algorithms are studied and proposed, two of them optimal and another two based on heuristics. This paper presents an analytical solution that selects, depending on the structure of the application and on the load of the whole system, the most suitable composition algorithm to be executed in order to obtain a composed application in bounded time.

Section: Introductionmentioning

confidence: 99%

A hybrid approach for selecting service‐based real‐time composition algorithms in heterogeneous environments

Concurrency and Computation

et al. 2011

“…All these result were obtained on DREQUIEMI [14], [32], [33] (ii) to evaluate the performance on an industrial benchmark; and (iii) to measure the overhead introduced by the distributed event model on the former distributed event model of the DRTSJ.…”

Section: Empirical Results and Evaluationmentioning

confidence: 99%

“…It is based on an industrial use-case defined in [33] for AUTOSAR applications. The frequency of the tasks in the framework ranges from 83 Hz to 0.25 kHz and all tasks have to meet their deadlines before their next release (i.e.,…”

Section: B Industrial Use-case Evaluationmentioning

confidence: 99%

A Dual Programming Model for Distributed Real-Time Java

2011

IEEE Trans. Ind. Inf.

Self Cite

More-and-more, the use of Java as a programming language for real-time applications is becoming of interest in industrial middleware. This is mainly because it offers advantages for the programmer as reduced deployment times, increased portability, and a number of APIs that may be integrated in large distributed applications. This paper contributes a dual communication model for distributed real-time Java applications. Current efforts in distributed real-time Java [e.g., The Distributed Real Time Specification for Java (DRTSJ)] are mainly focused on remote invocations (R.I.) and set aside other valuable approaches such as distributed events. The proposed model offers two choices for developing distributed real-time Java applications (one based on R.I., and another on distributed events), which may be used to develop applications. Both models include an additional support for asynchronism in communications, a feature that may speed up their communication performance. This paper includes a description for the two models, the changes that are required in the current API to accommodate them, and an empirical evaluation of their performance on a reference implementation.

“…COMPOSING AND SCHEDULING TT-DISTRIBUTED RT-JAVA SOAS 153 used by distributed real-time applications, such as the concept of connection-pool, memory-pool and thread-pool or the usage of a distributed garbage collector, defining a dual programming model that allows the choice of between a development based on remote invocation or based on distributed events [7][8][9]. Service-oriented paradigms have been successfully applied to distributed environments, increasing their flexibility and allowing the reusability of their components.…”

mentioning

confidence: 99%

Composing and scheduling service‐oriented applications in time‐triggered distributed real‐time Java environments

Concurrency and Computation

2012

During the last decade, the number of distributed application domains with temporal requirements has significantly augmented, arising the necessity of exploring new concepts and paradigms that allow, on the one hand, the development of dynamic and flexible distributed applications and, on the other hand, the reusability of code. Service-oriented paradigms have been successfully applied to distributed environments, increasing their flexibility and allowing the reusability of their components. Besides, distributed real-time Java technologies have shown to be a good candidate to deploy real-time distributed applications. This paper presents a model for service-oriented applications on a time-triggered distributed real-time Java environment, focusing on the definition of the temporal model of an application and its schedulability, applying and evaluating this model in real-time service-oriented composition algorithms. COMPOSING AND SCHEDULING TT-DISTRIBUTED RT-JAVA SOAS 153 used by distributed real-time applications, such as the concept of connection-pool, memory-pool and thread-pool or the usage of a distributed garbage collector, defining a dual programming model that allows the choice of between a development based on remote invocation or based on distributed events [7][8][9]. DREQUIEMI also includes a synchronous scheduling service [10] that allows the establishment of a common temporal axis for a distributed application.This work aims to give the basis to design and develop a service-oriented application in a distributed real-time Java environment. The support given by the synchronous scheduling service over DREQUIEMI for real-time coordination between entities within the system (allowing the coordination between services within an application) and between the system and external actions (allowing the system to interact with sensors and actuators or the cooperation between different autonomous applications) makes it a good candidate for supporting real-time service-based applications. This service is based on a time-triggered communications paradigm and also supports asynchronous traffic, with temporal isolation, needed for the communication of events between different entities of a real-time service-based distributed system.This RTRMI middleware will be used as underlying platform in a real-time service-based system. In a real-time service-based architecture, the underlying paradigm (RMI or any other) should be transparent from the point of view of the application programmer, so she only needs to be aware of the abstract notion of a service and of the desired behaviour and quality of service (QoS) of an application. The system is, then, in charge of building loosely coupled communications (one of the main characteristics of a service-based approach) on top of the given underlying platform. This is achieved by the definition of suitable architectures [11][12][13][14] and translation rules between application and communication concepts (as the presented in Section 4.2.1).When composing real-time service-oriented ...