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36 package gr.grnet.aquarium.connector.rabbitmq.service
38 import com.ckkloverdos.maybe.{Just, Failed, MaybeEither}
40 import gr.grnet.aquarium.converter.JsonTextFormat
41 import gr.grnet.aquarium.connector.handler._
42 import gr.grnet.aquarium.event.model.ExternalEventModel
43 import gr.grnet.aquarium.util.safeUnit
44 import gr.grnet.aquarium.service.EventBusService
45 import gr.grnet.aquarium.Aquarium
48 * Generic handler of events arriving to Aquarium.
50 * We first parse them to JSON ([[gr.grnet.aquarium.converter.JsonTextFormat]]) and an appropriate event model
51 * (`E <:` [[gr.grnet.aquarium.event.model.ExternalEventModel]]),
52 * then store them to DB
53 * (`S <:` [[gr.grnet.aquarium.event.model.ExternalEventModel]])
54 * and then forward them to business logic.
56 * All the above actions are given polymorphically via appropriate functions.
58 * @author Christos KK Loverdos <loverdos@gmail.com>
61 class GenericPayloadHandler[E <: ExternalEventModel, S <: ExternalEventModel]
62 (jsonParser: Array[Byte] ⇒ JsonTextFormat,
63 onJsonParserSuccess: (Array[Byte], JsonTextFormat) ⇒ Unit,
64 onJsonParserError: (Array[Byte], Throwable) ⇒ Unit,
65 eventParser: JsonTextFormat ⇒ E,
66 onEventParserSuccess: (Array[Byte], E) ⇒ Unit,
67 onEventParserError: (Array[Byte], Throwable) ⇒ Unit,
69 forwardAction: S ⇒ Unit) extends PayloadHandler {
71 def handlePayload(payload: Array[Byte]): HandlerResult = {
72 // 1. try to parse as json
73 MaybeEither { jsonParser(payload) } match {
75 safeUnit(onJsonParserError(payload, e))
77 HandlerResultReject(e.getMessage)
79 case Just(jsonTextFormat) ⇒
80 safeUnit(onJsonParserSuccess(payload, jsonTextFormat))
82 // 2. try to parse as model
83 MaybeEither { eventParser(jsonTextFormat) } match {
85 safeUnit(onEventParserError(payload, e))
87 HandlerResultReject(e.getMessage)
90 safeUnit(onEventParserSuccess(payload, event))
92 // 3. try to save to DB
93 MaybeEither { saveAction(event) } match {
98 // 4. try forward but it's OK if something bad happens here.
99 safeUnit { forwardAction(s) }