Packages
commanded
0.16.0-rc.0
1.4.10
1.4.9
1.4.8
1.4.7
1.4.6
1.4.3
1.4.2
1.4.1
1.4.0
1.4.0-rc.0
1.3.1
1.3.0
1.2.0
1.1.1
1.1.0
1.0.1
1.0.0
1.0.0-rc.1
1.0.0-rc.0
0.19.1
0.19.0
0.18.1
0.18.0
0.17.5
0.17.4
0.17.3
0.17.2
0.17.1
0.17.0
0.16.0
0.16.0-rc.1
0.16.0-rc.0
0.15.1
0.15.0
0.14.0
0.14.0-rc.0
0.13.0
0.12.0
0.11.0
0.10.0
0.9.0
0.8.5
0.8.4
0.8.3
0.8.1
0.8.0
0.7.1
0.6.2
0.6.1
0.6.0
0.4.0
0.3.1
0.3.0
0.2.1
0.2.0
0.1.0
Use Commanded to build your own Elixir applications following the CQRS/ES pattern.
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Files
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Files
test/event/support/error/error_event_handler.ex
defmodule Commanded.Event.ErrorEventHandler do
@moduledoc false
use Commanded.Event.Handler, name: __MODULE__
alias Commanded.Event.FailureContext
alias Commanded.Event.ErrorAggregate.Events.ErrorEvent
def handle(%ErrorEvent{}, _metadata) do
# simulate event handling failure
{:error, :failed}
end
def error({:error, :failed}, %ErrorEvent{strategy: "retry", delay: delay} = event, %FailureContext{
context: context
}) do
context = context |> record_failure() |> Map.put(:delay, delay)
case Map.get(context, :failures) do
too_many when too_many >= 3 ->
# stop error handler after third failure
send_reply({:error, :too_many_failures, context}, event)
{:stop, :too_many_failures}
_ ->
# retry event, record failure count in context map
send_reply({:error, :failed, context}, event)
{:retry, context}
end
end
# skip event
def error({:error, :failed}, %ErrorEvent{strategy: "skip"} = event, _failure_context) do
send_reply({:error, :skipping}, event)
:skip
end
# default behaviour is to stop the event handler with the given error reason
def error({:error, reason}, %ErrorEvent{strategy: "default"} = event, _failure_context) do
send_reply({:error, :stopping}, event)
{:stop, reason}
end
# return an invalid response
def error({:error, :failed}, %ErrorEvent{strategy: "invalid"} = event, _failure_context) do
send_reply({:error, :invalid}, event)
:invalid
end
defp record_failure(context) do
Map.update(context, :failures, 1, fn failures -> failures + 1 end)
end
defp send_reply(reply, %ErrorEvent{reply_to: reply_to}) do
pid = :erlang.list_to_pid(reply_to)
send(pid, reply)
end
end