Dashboard Edge connector handle cluster edge devices

[zero88]

1 client will have one dashboard, and manage some edge cluster devices, 1 cluster has many devices, 1 cluster can contains different set of edge device services (with other clusters) So 1 dashboard will have multiple REST services for each cluster. So these tasks will be:

1. Dashboard web must have model to manage many edge REST clusters
2. REST for each cluster is able to manage multiple devices
3. REST to manage device services (done) Ref: #15

Current Situation

• REST service is project :dashboard:connector:edge
• Edge device is project :edge:bios
• Using hazelcast member to join all edge devices and REST service in one cluster
• Bad things:
  • hazelcast member uses too much RAM when cluster is grown up
  • REST service is not considered as leader, when it is gone, one of edge device is selected as leader

Overview Solution

• Use hazelcast client in edge device
• Make REST service as leader with hazelcast member
• Maybe consider Kafka as alternative for hazelcast

Useful resource

• https://github.com/vert-x3/vertx-hazelcast/blob/master/src/main/asciidoc/index.adoc#using-lite-members
• https://github.com/vert-x3/vertx-hazelcast/blob/master/src/main/asciidoc/index.adoc#using-an-existing-hazelcast-cluster

Acceptance criteria

• Project :core:base
  • Add interface listener ClientListener when one client is joined or unjoined. Similar with ClusterNodeListener
  • In IClusterDelegate add registerClientListener, findClientById, getAllClients
  • Modify ClusterConfig to add listener address for member listener and client listener. Remember modify json config file. See here and here
• Project :core:cluster:hazelcast:client (new project)
  • Add hazelcast-client dependencies
  • Some shared code
• Project :core:cluster:hazelcast
  • Create HazelcastClientListener implements ClientListener
  • Implement HazelcastClusterDelegate based on changes in IClusterDelegate
  • Add some configuration for Hazelcast client
• Project :dashboard:connector:edge
  • Design database to keep information about list of devices. Use :core:sql (test in h2, production in postgres)
  • Update REST endpoint to
• Project :edge:bios
  • Add :core:cluster:hazelcast:client in dependencies
  • Using hazelcast client to connect :dashboard:connector:edge
  • Check :edge:bios can send/receive data from :dashboard:connector:edge

[zero88]

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