Class: Gitlab::Database::LoadBalancing::HostList

Inherits:
Object
  • Object
show all
Defined in:
lib/gitlab/database/load_balancing/host_list.rb

Overview

A list of database hosts to use for connections.

Instance Method Summary collapse

Constructor Details

#initialize(hosts = []) ⇒ HostList

hosts - The list of secondary hosts to add.



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# File 'lib/gitlab/database/load_balancing/host_list.rb', line 9

def initialize(hosts = [])
  @hosts = hosts.shuffle
  @index = 0
  @mutex = Mutex.new
  @hosts_gauge = Gitlab::Metrics.gauge(:db_load_balancing_hosts, 'Current number of load balancing hosts')

  set_metrics!
end

Instance Method Details

#host_names_and_ports ⇒ Object 



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# File 'lib/gitlab/database/load_balancing/host_list.rb', line 32

def host_names_and_ports
  @mutex.synchronize { @hosts.map { |host| [host.host, host.port] } }
end

#hosts ⇒ Object 



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# File 'lib/gitlab/database/load_balancing/host_list.rb', line 18

def hosts
  @mutex.synchronize { @hosts.dup }
end

#hosts=(hosts) ⇒ Object 



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# File 'lib/gitlab/database/load_balancing/host_list.rb', line 36

def hosts=(hosts)
  @mutex.synchronize do
    @hosts = hosts
    unsafe_shuffle
  end

  set_metrics!
end

#length ⇒ Object 



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# File 'lib/gitlab/database/load_balancing/host_list.rb', line 28

def length
  @mutex.synchronize { @hosts.length }
end

#next ⇒ Object

Sets metrics before returning next host



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# File 'lib/gitlab/database/load_balancing/host_list.rb', line 46

def next
  next_host.tap do |_|
    set_metrics!
  end
end

#shuffle ⇒ Object 



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# File 'lib/gitlab/database/load_balancing/host_list.rb', line 22

def shuffle
  @mutex.synchronize do
    unsafe_shuffle
  end
end