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tosca_definitions_version: tosca_simple_yaml_1_0

description: >
  Transaction subsystem, which is service template with topology_template,
  act as a nested system inside another system and also act as stand
  alone service template.

imports:
  - definitions.yaml

topology_template:
  description: Template of a database including its hosting stack.

  inputs:
    mq_server_ip:
      type: string
      description: IP address of the message queuing server to receive messages from.
      default: 127.0.0.1
    receiver_port:
      type: integer
      description: Port to be used for receiving messages.
      default: 8080
    my_cpus:
      type: integer
      description: Number of CPUs for the server.
      default: 2
      constraints:
        - valid_values: [ 1, 2, 4, 8 ]

  substitution_mappings:
    node_type: example.TransactionSubsystem
    capabilities:
      message_receiver: [ app, message_receiver ]
    requirements:
      database_endpoint: [ app, database ]

  node_templates:
    app:
      type: example.SomeApp
      properties:
        admin_user: foo
        pool_size: 10
      capabilities:
        message_receiver:
          properties:
            server_ip: { get_input: mq_server_ip }
      requirements:
        - host:
            node: websrv

    websrv:
      type: tosca.nodes.WebServer
      capabilities:
        data_endpoint:
          properties:
            port_name: { get_input: receiver_port }
      requirements:
        - host:
            node: server

    server:
      type: tosca.nodes.Compute
      capabilities:
        host:
          properties:
            disk_size: 10 GB
            num_cpus: { get_input: my_cpus }
            mem_size: 4096 MB
        os:
          properties:
            architecture: x86_64
            type: Linux
            distribution: Ubuntu
            version: 14.04

  outputs:
    receiver_ip:
      description: private IP address of the message receiver application
      value: { get_attribute: [ server, private_address ] }

    receiver_port:
      description: receiver_port of the message receiver application
      value: { get_input: receiver_port }

  groups:
    webserver_group:
      members: [ websrv, server ]
      type: tosca.groups.Root