Preliminary Domain Model

Table of Contents Summary Domain Model Research Questions Domain Model Notes Json output

Summary

Try to create a domain model in JSON so we can base a preiminary screen Ui with a vue app.

- look at docs to see the domain: Existing OpenDDS Monitor GUI.pdf

Domain Model Research

---

• look at docs to see the domain: Existing OpenDDS Monitor GUI.pdf
• /OpenDDS-latest.pdf pg 17 has a picture and definitions
• http://opendds.org/about/articles/Article-Intro.html#OpenDDS - has good diagram, also good examples of stock quoter
  • it has two topocs. stock quotes (prices), and stock exchange events (open, closeing, suspend, or resume)
• http://opendds.org/about/dds_overview.html has a good diagrams
  • see basic components of a system
  • The basic components are Topic, Publisher, Subscriber, DataWriter, and DataReader, Samples
  • there are also builtin topics which are meta data topics
  • when datareadsers topic and datawriters topics are compatible, then you can exchange data
  • publish manages the writers, subscriber managers the readers
  • topics are container of object data, samples are the instances - subscribers and readers take interest in the topics. for topics without keys, the is only a single instance of that topic. for those with keys, the key identifies a unique instance of the topic
  • https://community.rti.com/static/documentation/connext-dds/5.2.3/doc/manuals/connext_dds/html_files/RTI_ConnextDDS_CoreLibraries_UsersManual/Content/UsersManual/DDS_Samplesand_Keys.htm

Questions

• what is the purpose of DomainParticipant
• if you have publishers then what is a topic for
  • its a container for DataWriters
  • publisher/subscriver
• hows does a separate application connect to all this? through a subscriber?
  • it says it the application on the subscribing side retrieves the data from the DataReader
• what is the relationship between publishers/subscribers and topics
• applications that are using DDS are publishers and subscribers

Domain Model Notes

Topic
	name, id, datatype
	hasMany dataWriters
	hasMany dataReaders
	
Publisher
	hasMany datawriters
	
Subscriber
	hasMany dataReaders
	
DataWriter
	Topic
	
DataReader
	Topic
	
- Monitor topic are enabled for the Monitoring Web Gateway - the UI will look at monitor topics and built in topics	- ops topics are the domain topics like radar, stock, or flight etc - 
	
- had to add hibernate.allow_update_outside_transaction = true - so that the transaction in bootstrap can go through
		- try in grails 3.3.10 and it works
		- maybe we needed to create a service for this but i wont bother
		- to make it render everything just change _object.gson to deep: true
		- cant have the deep and the parent reference at the same time. So just have the topic -> writers and if you need writers write your own query to get that json

Json output

[
  {
    "id": 1,
    "dataWriters": [
      {
        "id": 1,
        "name": "gasPriceWriter"
      }
    ],
    "name": "gasPrice",
    "dataReaders": [
      {
        "id": 1,
        "name": "gasPriceReader1"
      },
      {
        "id": 2,
        "name": "gasPriceReader2"
      }
    ]
  }
]

[
  {
    "id": 1,
    "name": "gasPriceSubscriber",
    "dataReaders": [
      {
        "id": 1,
        "name": "gasPriceReader1"
      },
      {
        "id": 2,
        "name": "gasPriceReader2"
      }
    ]
  }
]

[
  {
    "id": 1,
    "dataWriters": [
      {
        "id": 1,
        "name": "gasPriceWriter"
      }
    ],
    "name": "gasPricePublisher"
  }
]