Class: PgVersions::ConnectionThread
- Inherits:
-
Object
- Object
- PgVersions::ConnectionThread
- Defined in:
- lib/pg_versions/pg_versions.rb
Defined Under Namespace
Classes: Closing
Instance Attribute Summary collapse
-
#status ⇒ Object
readonly
Returns the value of attribute status.
Instance Method Summary collapse
-
#initialize(connection) ⇒ ConnectionThread
constructor
A new instance of ConnectionThread.
- #request(function, *params) ⇒ Object
- #request_nonblock(function, *params) ⇒ Object
Constructor Details
#initialize(connection) ⇒ ConnectionThread
Returns a new instance of ConnectionThread.
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# File 'lib/pg_versions/pg_versions.rb', line 170 def initialize(connection) retry_on_exceptions = [ PG::ConnectionBad, PG::UnableToSend ] retry_on_exceptions << ActiveRecord::ConnectionNotEstablished if defined? ActiveRecord @subscribers = Hash.new { |h,k| h[k] = Set.new } @status = :disconnected @thread_requests_mutex = Mutex.new @thread_requests = [] thread_requests_notify_r, @thread_requests_notify_w = IO.pipe @thread = Thread.new { reset_connection = false retry_delay = 0 begin PgVersions.with_connection(connection, reset: reset_connection) do |pg_connection| @status = :connected retry_delay = 0 @subscribers.each_key { |channel| listen(pg_connection, channel) } read(pg_connection, @subscribers.keys).each_pair { |channel, version| @subscribers[channel].each { |subscriber| subscriber.notify({ channel => version }) } } loop { @thread_requests_mutex.synchronize { @thread_requests.each { |function, retpipe, params| raise Closing, retpipe if function == :stop retpipe << send(function, pg_connection, *params) } @thread_requests.clear } while notification = pg_connection.notifies channel, payload = notification[:relname], notification[:extra] @subscribers[channel].each { |subscriber| subscriber.notify({ channel => PgVersions.string_to_version(payload) }) } end #TODO: handle errors reads,_writes,_errors = IO::select([pg_connection.socket_io, thread_requests_notify_r]) if reads.include?(pg_connection.socket_io) pg_connection.consume_input end if reads.include?(thread_requests_notify_r) thread_requests_notify_r.read(1) end } rescue Closing => e e.retpipe << true end rescue *retry_on_exceptions => e reset_connection = true @status = :disconnected $stderr.puts "Pg connection failed. Retrying in #{retry_delay/1000.0}s." sleep retry_delay/1000.0 retry_delay = { 0=>100, 100=>1000, 1000=>2000, 2000=>2000 }[retry_delay] retry end } @thread.abort_on_exception = true end |
Instance Attribute Details
#status ⇒ Object (readonly)
Returns the value of attribute status.
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# File 'lib/pg_versions/pg_versions.rb', line 168 def status @status end |
Instance Method Details
#request(function, *params) ⇒ Object
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# File 'lib/pg_versions/pg_versions.rb', line 277 def request(function, *params) request_nonblock(function, *params).pop end |
#request_nonblock(function, *params) ⇒ Object
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# File 'lib/pg_versions/pg_versions.rb', line 281 def request_nonblock(function, *params) retpipe = Queue.new @thread_requests_mutex.synchronize { @thread_requests.push [function, retpipe, params] } @thread_requests_notify_w.write('!') retpipe end |