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Support callbacks for partitions assigned/revoked #108

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189ed1b
partitions listeners without pid
gelivisg Feb 11, 2021
db08f15
set listener in consumer config
gelivisg Feb 11, 2021
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3 changes: 3 additions & 0 deletions lib/kaffe/config/consumer.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ defmodule Kaffe.Config.Consumer do
group_config: consumer_group_config(),
consumer_config: client_consumer_config(),
message_handler: message_handler(),
partitions_listener: partitions_listener(),
async_message_ack: async_message_ack(),
rebalance_delay_ms: rebalance_delay_ms(),
max_bytes: max_bytes(),
Expand All @@ -31,6 +32,8 @@ defmodule Kaffe.Config.Consumer do

def message_handler, do: config_get!(:message_handler)

def partitions_listener, do: config_get!(:partitions_listener)

def async_message_ack, do: config_get(:async_message_ack, false)

def endpoints do
Expand Down
14 changes: 10 additions & 4 deletions lib/kaffe/consumer_group/subscriber/group_member.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,8 @@ defmodule Kaffe.GroupMember do
worker_manager_pid: nil,
topic: nil,
configured_offset: nil,
current_gen_id: nil
current_gen_id: nil,
partitions_listener: nil
end

## ==========================================================================
Expand Down Expand Up @@ -102,7 +103,8 @@ defmodule Kaffe.GroupMember do
group_coordinator_pid: pid,
consumer_group: consumer_group,
worker_manager_pid: worker_manager_pid,
topic: topic
topic: topic,
partitions_listener: Kaffe.Config.Consumer.configuration().partitions_listener
}}
end

Expand All @@ -111,14 +113,14 @@ defmodule Kaffe.GroupMember do
# configuration.
def handle_cast({:assignments_received, gen_id, assignments}, state) do
Logger.info("event#assignments_received=#{name(state.subscriber_name, state.topic)} generation_id=#{gen_id}")

state.partitions_listener.assigned(assignments)
Process.send_after(self(), {:allocate_subscribers, gen_id, assignments}, rebalance_delay())
{:noreply, %{state | current_gen_id: gen_id}}
end

def handle_cast({:assignments_revoked}, state) do
Logger.info("event#assignments_revoked=#{name(state.subscriber_name, state.topic)}")

state.partitions_listener.revoked()
stop_subscribers(state.subscribers)
{:noreply, %{state | :subscribers => []}}
end
Expand Down Expand Up @@ -207,6 +209,10 @@ defmodule Kaffe.GroupMember do
Application.get_env(:kaffe, :subscriber_mod, Kaffe.Subscriber)
end

defp partitions_listener do
Application.get_env(:kaffe, :partitions_listener)
end

defp name(subscriber_name, topic) do
:"#{__MODULE__}.#{subscriber_name}.#{topic}"
end
Expand Down