Class: MarchHare::Session
- Inherits:
-
Object
- Object
- MarchHare::Session
- Defined in:
- lib/march_hare/session.rb
Overview
Connection to a RabbitMQ node.
Used to open and close connections and open (create) new channels.
Defined Under Namespace
Classes: BlockBlockedUnblockedListener, SSLContextException
Constant Summary collapse
- DEFAULT_NETWORK_RECOVERY_INTERVAL =
Default reconnection interval for TCP connection failures
5.0
Instance Attribute Summary collapse
-
#channels ⇒ Array<MarchHare::Channel>
readonly
Channels opened on this connection.
Class Method Summary collapse
-
.connect(options = {}) ⇒ Object
Connects to a RabbitMQ node.
Instance Method Summary collapse
- #add_automatic_recovery_hook ⇒ Object
-
#automatically_recover ⇒ Object
Begins automatic connection recovery (typically only used internally to recover from network failures).
-
#clear_blocked_connection_callbacks ⇒ Object
Clears all callbacks defined with #on_blocked and #on_unblocked.
-
#close ⇒ Object
Closes connection gracefully.
-
#closed? ⇒ Boolean
True if this channel is closed.
-
#create_channel(n = nil) ⇒ MarchHare::Channel
Opens a new channel.
- #disable_automatic_recovery ⇒ Object
-
#flush ⇒ Object
Flushes the socket used by this connection.
- #heartbeat=(n) ⇒ Object
- #hostname ⇒ Object (also: #host)
-
#initialize(connection_factory, opts = {}) ⇒ Session
constructor
A new instance of Session.
- #method_missing(selector, *args) ⇒ Object
-
#on_blocked(&block) ⇒ Object
Defines a connection.blocked handler.
-
#on_shutdown(&block) ⇒ Object
Defines a shutdown event callback.
-
#on_unblocked(&block) ⇒ Object
Defines a connection.unblocked handler.
-
#open? ⇒ Boolean
(also: #connected?)
True if connection is open, false otherwise.
- #port ⇒ Object
- #recover_shutdown_hooks(connection) ⇒ Object
- #register_channel(ch) ⇒ Object
- #should_initiate_connection_recovery?(signal) ⇒ Boolean
-
#start ⇒ Object
No-op, exists for better API compatibility with Bunny.
- #tls? ⇒ Boolean (also: #ssl?)
- #to_s ⇒ String
- #unregister_channel(ch) ⇒ Object
- #username ⇒ Object (also: #user)
- #vhost ⇒ Object
Constructor Details
#initialize(connection_factory, opts = {}) ⇒ Session
Returns a new instance of Session.
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# File 'lib/march_hare/session.rb', line 139 def initialize(connection_factory, opts = {}) @cf = connection_factory # March Hare uses its own connection recovery implementation and # as of Java client 4.x automatic recovery is enabled by # default. MK. @cf.automatic_recovery_enabled = false @cf.topology_recovery_enabled = false @uri = opts[:uri] @uses_uri = !(@uri.nil?) # executors cannot be restarted after shutdown, # so we really need a factory here. MK. @executor_factory = opts[:executor_factory] || build_executor_factory_from(opts) # we expect this option to be specified in seconds @executor_shutdown_timeout = opts.fetch(:executor_shutdown_timeout, 30.0) @addresses = self.class.adresses_from(opts) @connection = build_new_connection @channels = JavaConcurrent::ConcurrentHashMap.new # should automatic recovery from network failures be used? @automatically_recover = if opts[:automatically_recover].nil? && opts[:automatic_recovery].nil? true else opts[:automatically_recover] || opts[:automatic_recovery] end @network_recovery_interval = opts.fetch(:network_recovery_interval, DEFAULT_NETWORK_RECOVERY_INTERVAL) @shutdown_hooks = Array.new if @automatically_recover self.add_automatic_recovery_hook end end |
Dynamic Method Handling
This class handles dynamic methods through the method_missing method
#method_missing(selector, *args) ⇒ Object
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# File 'lib/march_hare/session.rb', line 372 def method_missing(selector, *args) @connection.__send__(selector, *args) end |
Instance Attribute Details
#channels ⇒ Array<MarchHare::Channel> (readonly)
Returns Channels opened on this connection.
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# File 'lib/march_hare/session.rb', line 135 def channels @channels end |
Class Method Details
.connect(options = {}) ⇒ Object
Connects to a RabbitMQ node.
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# File 'lib/march_hare/session.rb', line 57 def self.connect( = {}) cf = ConnectionFactory.new if [:uri] cf.uri = [:uri] if [:uri] elsif [:hosts] || [:addresses] cf.virtual_host = vhost_from() if include_vhost?() cf.username = username_from() if include_username?() cf.password = password_from() if include_password?() else cf.host = hostname_from() if include_host?() cf.port = [:port].to_i if [:port] cf.virtual_host = vhost_from() if include_vhost?() cf.username = username_from() if include_username?() cf.password = password_from() if include_password?() end cf.connection_timeout = timeout_from() if include_timeout?() cf.requested_heartbeat = heartbeat_from() cf.connection_timeout = connection_timeout_from() if include_connection_timeout?() cf.thread_factory = thread_factory_from() if include_thread_factory?() cf.exception_handler = exception_handler_from() if include_exception_handler?() tls = ([:ssl] || [:tls]) case tls when true then cf.use_ssl_protocol when String then # TODO: logging $stdout.puts "Using TLS/SSL version #{tls}" # Note: `options[:trust_manager] = com.rabbitmq.client.NullTrustManager.new` can be set to disable TLS verification. if (cert_path = tls_certificate_path_from()) && (password = tls_certificate_password_from()) ctx = SSLContext.get_instance(tls) pwd = password.to_java.to_char_array begin is = File.new(cert_path).to_inputstream ks = KeyStore.get_instance('PKCS12') ks.load(is, pwd) kmf = KeyManagerFactory.get_instance("SunX509") kmf.init(ks, pwd) if [:trust_manager] ctx.init(kmf.get_key_managers, [[:trust_manager]], nil) else # use the key store as the trust store tmf = TrustManagerFactory.get_instance(TrustManagerFactory.getDefaultAlgorithm()); tmf.init(ks) ctx.init(kmf.get_key_managers, tmf.getTrustManagers(), nil) end cf.use_ssl_protocol(ctx) rescue Java::JavaLang::Throwable => e = e. << "\n" << e.backtrace.join("\n") raise SSLContextException.new() ensure is.close if is end elsif [:trust_manager] cf.use_ssl_protocol(tls, [:trust_manager]) else cf.use_ssl_protocol(tls) end end new(cf, ) end |
Instance Method Details
#add_automatic_recovery_hook ⇒ Object
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# File 'lib/march_hare/session.rb', line 257 def add_automatic_recovery_hook fn = Proc.new do |_, signal| if should_initiate_connection_recovery?(signal) self.automatically_recover end end @automatic_recovery_hook = self.on_shutdown(&fn) end |
#automatically_recover ⇒ Object
Begins automatic connection recovery (typically only used internally to recover from network failures)
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# File 'lib/march_hare/session.rb', line 279 def automatically_recover ms = @network_recovery_interval * 1000 # recovering immediately makes little sense. Wait a bit first. MK. java.lang.Thread.sleep(ms) new_connection = converting_rjc_exceptions_to_ruby do reconnecting_on_network_failures(ms) { build_new_connection } end self.recover_shutdown_hooks(new_connection) # sorting channels by id means that the cases like the following: # # ch1 = conn.create_channel # ch2 = conn.create_channel # # x = ch1.topic("logs", :durable => false) # q = ch2.queue("", :exclusive => true) # # q.bind(x) # # will recover correctly because exchanges and queues will be recovered # in the order the user expects and before bindings. @channels.sort_by {|id, _| id}.each do |id, ch| begin ch.automatically_recover(self, new_connection) rescue Exception, java.io.IOException => e # TODO: logging $stderr.puts e end end @connection = new_connection end |
#clear_blocked_connection_callbacks ⇒ Object
Clears all callbacks defined with #on_blocked and #on_unblocked.
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# File 'lib/march_hare/session.rb', line 251 def clear_blocked_connection_callbacks @connection.clear_blocked_listeners end |
#close ⇒ Object
Closes connection gracefully.
This includes shutting down consumer work pool gracefully, waiting up to 5 seconds for all consumer deliveries to be processed.
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# File 'lib/march_hare/session.rb', line 208 def close @channels.select { |_, ch| ch.open? }.each do |_, ch| ch.close end maybe_shut_down_executor @connection.close end |
#closed? ⇒ Boolean
Returns true if this channel is closed.
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# File 'lib/march_hare/session.rb', line 224 def closed? !@connection.open? end |
#create_channel(n = nil) ⇒ MarchHare::Channel
Opens a new channel.
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# File 'lib/march_hare/session.rb', line 182 def create_channel(n = nil) jc = if n @connection.create_channel(n) else @connection.create_channel end if jc.nil? = <<-MSG Unable to create a channel. This is likely due to having a channel_max setting on the rabbitmq broker (see https://www.rabbitmq.com/configure.html). There are currently #{@channels.size} channels on this connection. MSG raise ::MarchHare::ChannelError.new(, false) end ch = Channel.new(self, jc) register_channel(ch) ch end |
#disable_automatic_recovery ⇒ Object
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# File 'lib/march_hare/session.rb', line 273 def disable_automatic_recovery @connection.remove_shutdown_listener(@automatic_recovery_hook) if @automatic_recovery_hook end |
#flush ⇒ Object
Flushes the socket used by this connection.
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# File 'lib/march_hare/session.rb', line 321 def flush @connection.flush end |
#heartbeat=(n) ⇒ Object
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# File 'lib/march_hare/session.rb', line 326 def heartbeat=(n) @connection.heartbeat = n end |
#hostname ⇒ Object Also known as: host
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# File 'lib/march_hare/session.rb', line 352 def hostname @cf.host end |
#on_blocked(&block) ⇒ Object
Defines a connection.blocked handler
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# File 'lib/march_hare/session.rb', line 241 def on_blocked(&block) self.add_blocked_listener(BlockBlockedUnblockedListener.for_blocked(block)) end |
#on_shutdown(&block) ⇒ Object
Defines a shutdown event callback. Shutdown events are broadcasted when a connection is closed, either explicitly or forcefully, or due to a network/peer failure.
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# File 'lib/march_hare/session.rb', line 231 def on_shutdown(&block) sh = ShutdownListener.new(self, &block) @shutdown_hooks << sh @connection.add_shutdown_listener(sh) sh end |
#on_unblocked(&block) ⇒ Object
Defines a connection.unblocked handler
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# File 'lib/march_hare/session.rb', line 246 def on_unblocked(&block) self.add_blocked_listener(BlockBlockedUnblockedListener.for_unblocked(block)) end |
#open? ⇒ Boolean Also known as: connected?
Returns true if connection is open, false otherwise.
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# File 'lib/march_hare/session.rb', line 218 def open? @connection.open? end |
#port ⇒ Object
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# File 'lib/march_hare/session.rb', line 357 def port @cf.port end |
#recover_shutdown_hooks(connection) ⇒ Object
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# File 'lib/march_hare/session.rb', line 314 def recover_shutdown_hooks(connection) @shutdown_hooks.each do |sh| connection.add_shutdown_listener(sh) end end |
#register_channel(ch) ⇒ Object
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# File 'lib/march_hare/session.rb', line 387 def register_channel(ch) @channels[ch.channel_number] = ch end |
#should_initiate_connection_recovery?(signal) ⇒ Boolean
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# File 'lib/march_hare/session.rb', line 268 def should_initiate_connection_recovery?(signal) !signal.initiated_by_application || signal.instance_of?(MissedHeartbeatException) end |
#start ⇒ Object
No-op, exists for better API compatibility with Bunny.
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# File 'lib/march_hare/session.rb', line 331 def start # no-op # # This method mimics Bunny::Session#start in Bunny 0.9. # Without it, #method_missing will proxy the call to com.rabbitmq.client.AMQConnection, # which happens to have a #start method which is not idempotent. # # So we stub out #start in case someone migrating from Bunny forgets to remove # the call to #start. MK. self end |
#tls? ⇒ Boolean Also known as: ssl?
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# File 'lib/march_hare/session.rb', line 361 def tls? if @uses_uri u = java.net.URI.new(@uri.to_java_string) u.scheme == "amqps" else self.port == ConnectionFactory.DEFAULT_AMQP_OVER_SSL_PORT end end |
#to_s ⇒ String
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# File 'lib/march_hare/session.rb', line 377 def to_s "#<#{self.class.name}:#{object_id} #{@cf.username}@#{@cf.host}:#{@cf.port}, vhost=#{@cf.virtual_host}>" end |
#unregister_channel(ch) ⇒ Object
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# File 'lib/march_hare/session.rb', line 392 def unregister_channel(ch) @channels.delete(ch.channel_number) end |
#username ⇒ Object Also known as: user
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# File 'lib/march_hare/session.rb', line 343 def username @cf.username end |
#vhost ⇒ Object
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# File 'lib/march_hare/session.rb', line 348 def vhost @cf.virtual_host end |