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    Reliable mobile agents with transactional behaviour
    (inderscience, 2014) Zeghache, Linda; Badache, Nadjib; Hurfin, Michel; Moise, Izabela
    The mobile agent systems are well suited for certain types of real world applications such as e-commerce and distributed transactions. However, this technology is not being used by many applications. This is due to the lack of infrastructures and methodologies that address fault tolerance and transactions. The basic requirements for fault-tolerant transactional mobile agent are: 1) non-blocking (i.e., a single failure does not prevent progress of the mobile agent execution); 2) exactly-once (i.e., multiple executions of the agent are prevented); 3) the execution atomicity (i.e., all tasks are committed or none at all). In this paper, we propose a mechanism for providing fault-tolerance capability based on the mobile agent replication and the backward process. The failure detection is not perfect. The replication may results in multiple executions of the agent. So, we defined a technique that detects multiple executions and allows only one agent to go on while the others are stopped. To ensure the execution atomicity of the distributed transaction we used a commit at destination approach.
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    Cloud-Based Support for Transactional Mobile Agents
    (2011-03-22) Moise, Izabela; Hurfin, Michel; Zeghache, Linda; Badache, Nadjib
    Mobile devices are now equipped with multiple sensors and networking capabilities. They can gather information about their surrounding environment and interact both with nearby nodes, using a dynamic and self-configurable ad-hoc network, and with distant nodes via the Internet. While the concept of mobile agent is appropriate to explore the ad-hoc network and autonomously discover service providers, it is not suitable for the implementation of strong distributed synchronization mechanisms. Moreover, the termination of a task assigned to an agent may be compromised if the persistence of the agent itself is not ensured. In the case of a transactional mobile agent, we identify two services, Availability of the Sources and Atomic Commit, that can be supplied by more powerful entities located in a cloud. We propose a solution where these two services are provided in a reliable and homogeneous way. To guarantee reliability, the proposed solution relies on a single agreement protocol that orders continuously all the new actions whatever the related transaction and service.
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    Remote Reliable Services to Support Transactional Mobile Agents
    (IEEE, 2010-07-15) Moise, Izabela; Hurfin, Michel; Zeghache, Linda; Badache, Nadjib
    Mobile devices are now equipped with multiple sensors and networking capabilities. They can gather information about their surrounding environment and interact both with nearby nodes, using a dynamic and self-configurable ad-hoc network, and with distant nodes via the Internet. While the concept of mobile agent is appropriate to explore the ad-hoc network and autonomously discover service providers, it is not suitable for the implementation of strong distributed synchronization mechanisms. Moreover, the termination of a task assigned to an agent may be compromised if the persistence of the agent itself is not ensured. In the case of a transactional mobile agent, we identify two services, Availability of the Source and Atomic Commit, that have to be supplied by more powerful entities located outside the ad-hoc network, in a remote network, called the support network. We propose a solution where the two services are successively provided by an active entity called the leader. In the support network, crash failures may also occur. To guarantee reliability, the main actions performed by the leader are the subject of a consensus with all the other potential leaders. The proposed solution relies on a single agreement protocol that orders continuously all the new actions.
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    Optimistic Replication Approach for Transactional Mobile Agent Fault Tolerance
    (Jixin Ma, Liz Bacon, Wencai Du, Miltos Petridis, 2010-06-09) Zeghache, Linda; Badache, Nadjib
    The mobile agent is a computer program that can move between different hosts in heterogeneous networks. This paradigm is advantageous for distributed systems implementation, especially in mobile computing application characterized by low bandwidth, high latency and unreliable networks connections. Mobile agent is also attractive for distributed transactions applications. Although mobile agent has been studied for twenty years for some good reasons, it is not largely used in developing distributed systems for simple reasons: important issues like security and fault tolerance are not solved in effective way. In this paper we address the issue of fault tolerance in mobile agent systems and transactional support. We present the agent system design and describe the protocol of our approach in which we treat infrastructure failures to prevent a partial or complete loss of mobile agent and deal with semantic failures to ensure atomic execution and transactional support for mobile agent.
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    Providing Reliability for Transactional Mobile Agents
    (CERIST, 2012-06) Zeghache, Linda
    A transactional agent is a mobile agent which migrates from a site to another site to execute a distributed transaction assigned by a user. Works on transactional mobile agents have identified two problems that can’t be solved by the agent alone. The first one is related to the reliability. The lack of a fault tolerant infrastructure and methodologies that address fault tolerant execution of mobile agents highlights a major drawback of this technology. The second problem for which the agent needs assistance is related to the atomic validation of the transaction. In this paper we address mobile agent fault tolerance and a transactional support.
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    Optimistic Replication Approach for Transactional Mobile Agent Fault Tolerance
    (CERIST, 2010-04) Zeghache, Linda; Badache, Nadjib
    The mobile agent is a computer program that can move agent and deal with semantic failures to ensure atomic execution and transactional support for mobile agent between different hosts in heterogeneous networks. This paradigm is advantageous for distributed systems implementation, especially in mobile computing application characterized by low bandwidth, high latency and unreliable networks connections. Mobile agent is also attractive for distributed transactions applications. Although mobile agent has been studied for twenty years for some good reasons, it is not largely used in developing distributed systems for simple reasons: important issues like security and fault tolerance are not solved in effective way. In this paper we address the issue of fault tolerance in mobile agent systems and transactional support. We present the agent system design and describe the protocol of our approach in which we treat infrastructure failures to prevent a partial or complete loss of mobile