Class: Google::Cloud::Pubsub::Topic::List

Inherits:
Array
  • Object
show all
Defined in:
lib/google/cloud/pubsub/topic/list.rb

Overview

Topic::List is a special case Array with additional values.

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#token ⇒ Object

If not empty, indicates that there are more topics that match the request and this value should be passed to the next Project#topics to continue.



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# File 'lib/google/cloud/pubsub/topic/list.rb', line 29

def token
  @token
end

Instance Method Details

#all(request_limit: nil) {|topic| ... } ⇒ Enumerator

Retrieves all topics by repeatedly loading #next until #next? returns false. Calls the given block once for each topic, which is passed as the parameter.

An Enumerator is returned if no block is given.

This method may make several API calls until all topics are retrieved. Be sure to use as narrow a search criteria as possible. Please use with caution.

Examples:

Iterating each topic by passing a block:

require "google/cloud"

gcloud = Google::Cloud.new
pubsub = gcloud.pubsub

topics = pubsub.topics
topics.all do |topic|
  puts topic.name
end

Using the enumerator by not passing a block:

require "google/cloud"

gcloud = Google::Cloud.new
pubsub = gcloud.pubsub

topics = pubsub.topics
all_names = topics.all.map do |topic|
  topic.name
end

Limit the number of API calls made:

require "google/cloud"

gcloud = Google::Cloud.new
pubsub = gcloud.pubsub

topics = pubsub.topics
topics.all(request_limit: 10) do |topic|
  puts topic.name
end

Parameters:

  • request_limit (Integer) —

    The upper limit of API requests to make to load all topics. Default is no limit.

Yields:

  • (topic) —

    The block for accessing each topic.

Yield Parameters:

  • topic (Topic) —

    The topic object.

Returns:

  • (Enumerator) 


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# File 'lib/google/cloud/pubsub/topic/list.rb', line 132

def all request_limit: nil
  request_limit = request_limit.to_i if request_limit
  unless block_given?
    return enum_for(:all, request_limit: request_limit)
  end
  results = self
  loop do
    results.each { |r| yield r }
    if request_limit
      request_limit -= 1
      break if request_limit < 0
    end
    break unless results.next?
    results = results.next
  end
end

#next ⇒ Topic::List

Retrieve the next page of topics.

Examples:

require "google/cloud"

gcloud = Google::Cloud.new
pubsub = gcloud.pubsub

topics = pubsub.topics
if topics.next?
  next_topics = topics.next
end

Returns:



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# File 'lib/google/cloud/pubsub/topic/list.rb', line 73

def next
  return nil unless next?
  ensure_service!
  options = { token: token, max: @max }
  grpc = @service.list_topics options
  self.class.from_grpc grpc, @service, @max
end

#next? ⇒ Boolean

Whether there a next page of topics.

Examples:

require "google/cloud"

gcloud = Google::Cloud.new
pubsub = gcloud.pubsub

topics = pubsub.topics
if topics.next?
  next_topics = topics.next
end

Returns:

  • (Boolean) 


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# File 'lib/google/cloud/pubsub/topic/list.rb', line 53

def next?
  !token.nil?
end