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pubsub_publisher_flow_control.rb
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pubsub_publisher_flow_control.rb
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# Copyright 2023 Google, Inc
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
require "google/cloud/pubsub"
def publish_messages_async_with_flow_control topic_id:
# [START pubsub_publisher_flow_control]
# topic_id = "your-topic-id"
pubsub = Google::Cloud::Pubsub.new
topic = pubsub.topic topic_id, async: {
# Configure how many messages the publisher client can hold in memory
# and what to do when messages exceed the limit.
flow_control: {
message_limit: 100,
byte_limit: 10 * 1024 * 1024, # 10 MiB
# Block more messages from being published when the limit is reached. The
# other options are :ignore and :error.
limit_exceeded_behavior: :block
}
}
# Rapidly publishing 1000 messages in a loop may be constrained by flow control.
1000.times do |i|
topic.publish_async "message #{i}" do |result|
raise "Failed to publish the message." unless result.succeeded?
end
end
# Stop the async_publisher to send all queued messages immediately.
topic.async_publisher.stop.wait!
puts "Published messages with flow control settings to #{topic_id}."
# [END pubsub_publisher_flow_control]
end