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Use Commanded to build your own Elixir applications following the CQRS/ES pattern.
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Files
test/commands/dispatch_consistency_test.exs
defmodule Commanded.Commands.DispatchConsistencyTest do
use Commanded.StorageCase
alias Commanded.Commands.{
ConsistencyAggregateRoot,
ConsistencyRouter,
ConsistencyPrefixRouter,
EventuallyConsistentEventHandler,
ExecutionResult,
StronglyConsistentEventHandler,
}
alias Commanded.EventStore
alias Commanded.Helpers.ProcessHelper
alias ConsistencyAggregateRoot.{
ConsistencyCommand,
NoOpCommand,
RequestDispatchCommand,
}
setup do
{:ok, handler1} = StronglyConsistentEventHandler.start_link()
{:ok, handler2} = EventuallyConsistentEventHandler.start_link()
on_exit fn ->
ProcessHelper.shutdown(handler1)
ProcessHelper.shutdown(handler2)
end
:ok
end
test "should wait for strongly consistent event handler to handle event" do
command = %ConsistencyCommand{uuid: UUID.uuid4(), delay: 0}
assert :ok = ConsistencyRouter.dispatch(command, consistency: :strong)
end
# default consistency timeout set to 100ms test config
test "should timeout waiting for strongly consistent event handler to handle event" do
command = %ConsistencyCommand{uuid: UUID.uuid4(), delay: 5_000}
assert {:error, :consistency_timeout} = ConsistencyRouter.dispatch(command, consistency: :strong)
end
test "should not wait when command creates no events" do
command = %NoOpCommand{uuid: UUID.uuid4()}
assert :ok = ConsistencyRouter.dispatch(command, consistency: :strong)
end
test "should allow strongly consistent event handler to dispatch a command" do
command = %RequestDispatchCommand{uuid: UUID.uuid4(), delay: 0}
assert :ok = ConsistencyRouter.dispatch(command, consistency: :strong)
end
test "should timeout waiting for strongly consistent handler dispatching a command" do
command = %RequestDispatchCommand{uuid: UUID.uuid4(), delay: 5_000}
assert {:error, :consistency_timeout} = ConsistencyRouter.dispatch(command, consistency: :strong)
end
describe "aggregate identity prefix" do
test "should wait for strongly consistent event handler to handle event" do
uuid = UUID.uuid4()
command = %ConsistencyCommand{uuid: uuid, delay: 0}
assert :ok = ConsistencyPrefixRouter.dispatch(command, consistency: :strong)
end
test "should append events to stream using prefixed aggregate uuid" do
uuid = UUID.uuid4()
command = %ConsistencyCommand{uuid: uuid, delay: 0}
assert {:ok, %ExecutionResult{aggregate_uuid: aggregate_uuid}}
= ConsistencyPrefixRouter.dispatch(command, consistency: :strong, include_execution_result: true)
assert aggregate_uuid == "example-prefix-" <> uuid
recorded_events = EventStore.stream_forward(aggregate_uuid) |> Enum.to_list()
assert length(recorded_events) == 1
end
end
end