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                    ATTX Project
            
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                    Deploying ATTX Components on Docker Swarm
            
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                    Deploying ATTX Broker on Kontena
            
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                    Workflow Component
            
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                    ETL Artifacts
            
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                    UVProvovenance Service
            
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                    Graph Component
            
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                    Graph Manager Service
            
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                    Graph Manager Message Examples
            
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                    Graph Store
            
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                    Ontology/Data model
            
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                    Linking Strategies
            
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                    Distribution Component
            
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                    Service Discovery
            
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                    Consul Service Discovery Implementation
            
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                    Consul for Service Discovery on Docker Swarm
            
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                    Message Broker
            
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                    ActiveMQ Message Broker
            
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                    RabbitMQ Message Broker
            
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                    Provenance Service
            
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                    Provenance Messages Examples
            
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                    RML Service
            
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                    RML Messages Examples
            
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                    Indexing Service
            
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                    Indexing Messages Examples
            
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                    Graph Framing Service
            
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                    Graph Framing Messages Examples
            
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                    Validation Service
            
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                    Validation Examples
            
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                    Ontology Service
            
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                    Ontology Examples
            
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                    Data Administrator's User guide
            
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                    ATTX Development Environment
            
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                    Feature Roadmap
            
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                    Release Plan
            
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                    CI/CD Enviroment
            
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                    Jenkins CI
            
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                    Build Environment Setup
            
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                    Containerized Testing
            
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                    Reports
            
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                    CSC cPouta Cloud Services Report
            
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                    Building with (Py)Gradle
            
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                    Messaging Brokers Solutions Overview
            
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                    Service Discovery Solutions Overview
            
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                    Workflow Management Tools Overview
            
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                    API Gateway Solutions Overview
            
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                    Presentations
            
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                    Open Source Contributions
            
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                                <div class="git-author-container git-author-top"><div class="modified">Current page last modified at: 07-Dec-2017 12:32:44</div></div><h1 id="asynchronous-communication-between-platform-components">Asynchronous communication between platform components</h1>
<p>Replicating request/async response pattern between workflow steps and ATTX services. In order for the responses to be non blocking while waiting fro them, we recommend implementing under the assumption that the response might not arrive for a while.</p>
<p><img src="images/messaging-request-response.svg" alt="Figure 1. Request/async response pattern using message broker"></p>
<p>Two solutions have been taken into consideration for the Messaging service:</p>
<ul>
<li><a href="MessageBroker-ActiveMQ.html">ActiveMQ Message Broker</a></li>
<li><a href="MessageBroker-RabbitMQ.html">RabbitMQ Message Broker</a> - selected</li>
</ul>
<p>Provenance service should receive all(?) the messages. This can implemented using Camel route that intercept, copies and sends messages to queue://core.provenance.</p>
<h2 id="requirements-for-attx-services">Requirements for ATTX services</h2>
<ul>
<li>For queues, service must listen to a queue named <code>attx.{servicename}</code> or <code>attx.{servicename}.inbox</code> or <code>provenance.inbox</code>. Are there any reserved topic names?</li>
<li>Queues starting with &quot;core.&quot; are reserved for special cases such as for provenance service.</li>
</ul>
<h2 id="how-do-attx-service-find-the-messagebroker">How do ATTX service find the MessageBroker?</h2>
<p>Implementation alternatives:</p>
<ul>
<li>Configure and use <a href="http://activemq.apache.org/discovery.html" target="_blank">discovery service</a> provided by the ActiveMQ that is based on multicast.</li>
<li>Have ActiveMQ to register itself to the ATTX Discovery service and query that or use it through a proxy.</li>
</ul>
<h2 id="using-topics-aka-publishsubscribe">Using topics aka publish/subscribe</h2>
<p>What are the use cases for topic based messaging where the same message can have multiple recipients?</p>
<h2 id="example-messaging-ones-way-through-basic-distribution-workflow">Example: Messaging one&apos;s way through basic distribution workflow</h2>
<p>This examples shows the steps, services and messages involved in a basic distribution workflow that takes data from from the graphstore, transfers it to JSON and indexes newly created JSON data to a ElasticSearch.</p>
<p><strong>TODO: Maybe we need to add some messages related to provenance, depending on how it is implemented.</strong></p>
<p><img src="images/distribution-workflow-basic.svg" alt="Distribution workflow and services"></p>
<p><strong>Query datasets</strong>
Since the workflow is using data already existing in the platform, we need to be able to query the created datasets and their properties. Step will communicate with the GM-API and directly with the graphstore.</p>
<p><strong>Transform</strong>
Example step uses <a href="https://json-ld.org/spec/latest/json-ld-framing/" target="_blank">JSON-LD framing</a> to generate JSON representation of the source graph. In order to do that, it needs to get the graph data from the GM-API.</p>
<p><strong>Index</strong>
Indexing services organizes ES indices and indexes the output from the Framer service.</p>
<p><strong>Manage graphs</strong>
GM-API uses Fuseki&apos;s API to add, delete and retrieve triples from the graph store.</p>
<p><strong>Manage indices</strong>
Indexing services uses Elastic&apos;s APIs to delete and create indices and to index JSON document either individually or in bulk.</p>
<h2 id="references">References:</h2>
<ul>
<li><a href="https://www.nginx.com/blog/building-microservices-inter-process-communication/" target="_blank">Inter-Process Communication in a Microservices Architecture</a></li>
</ul>

                                
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