Class: RJR::Nodes::TCP
Overview
TCP node definition, listen for and invoke json-rpc requests via TCP sockets
Clients should specify the hostname / port when listening for requests and when invoking them.
Constant Summary collapse
- RJR_NODE_TYPE =
:tcp
- PERSISTENT_NODE =
true
- INDIRECT_NODE =
false
Instance Attribute Summary collapse
-
#connections ⇒ Object
Returns the value of attribute connections.
Attributes inherited from RJR::Node
#connection_event_handlers, #dispatcher, #message_headers, #node_id
Instance Method Summary collapse
-
#initialize(args = {}) ⇒ TCP
constructor
TCP initializer.
-
#invoke(uri, rpc_method, *args) ⇒ Object
Instructs node to send rpc request, and wait for / return response.
-
#listen ⇒ Object
Instruct Node to start listening for and dispatching rpc requests.
-
#notify(uri, rpc_method, *args) ⇒ Object
Instructs node to send rpc notification (immadiately returns / no response is generated).
-
#send_msg(data, connection) ⇒ Object
Send data using specified connection.
- #to_s ⇒ Object
Methods inherited from RJR::Node
#clear_event_handlers, em, #em, #halt, #indirect?, indirect?, #join, #node_type, #on, persistent?, #persistent?, tp, #tp
Constructor Details
#initialize(args = {}) ⇒ TCP
TCP initializer
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# File 'lib/rjr/nodes/tcp.rb', line 113 def initialize(args = {}) super(args) @host = args[:host] @port = args[:port] @connections = [] @connections_lock = Mutex.new end |
Instance Attribute Details
#connections ⇒ Object
Returns the value of attribute connections.
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# File 'lib/rjr/nodes/tcp.rb', line 86 def connections @connections end |
Instance Method Details
#invoke(uri, rpc_method, *args) ⇒ Object
Instructs node to send rpc request, and wait for / return response.
Implementation of RJR::Node#invoke
Do not invoke directly from em event loop or callback as will block the message subscription used to receive responses
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# File 'lib/rjr/nodes/tcp.rb', line 154 def invoke(uri, rpc_method, *args) uri = URI.parse(uri) host,port = uri.host, uri.port = Messages::Request.new :method => rpc_method, :args => args, :headers => @message_headers connection = nil @@em.schedule { init_client(:host => host, :port => port, :rjr_node => self) { |c| connection = c c.send_msg .to_s } } # TODO optional timeout for response ? result = wait_for_result() if result.size > 2 raise Exception, result[2] end return result[1] end |
#listen ⇒ Object
Instruct Node to start listening for and dispatching rpc requests
Implementation of RJR::Node#listen
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# File 'lib/rjr/nodes/tcp.rb', line 136 def listen @@em.schedule { @@em.start_server @host, @port, TCPConnection, { :rjr_node => self } } self end |
#notify(uri, rpc_method, *args) ⇒ Object
Instructs node to send rpc notification (immadiately returns / no response is generated)
Implementation of RJR::Node#notify
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# File 'lib/rjr/nodes/tcp.rb', line 187 def notify(uri, rpc_method, *args) # will block until message is published published_l = Mutex.new published_c = ConditionVariable.new uri = URI.parse(uri) host,port = uri.host, uri.port invoked = false conn = nil = Messages::Notification.new :method => rpc_method, :args => args, :headers => @message_headers @@em.schedule { init_client(:host => host, :port => port, :rjr_node => self) { |c| conn = c c.send_msg .to_s # XXX, this should be invoked only when we are sure event # machine sent message. Shouldn't pose a problem unless event # machine is killed immediately after published_l.synchronize { invoked = true ; published_c.signal } } } published_l.synchronize { published_c.wait published_l unless invoked } #sleep 0.01 until conn.get_outbound_data_size == 0 nil end |
#send_msg(data, connection) ⇒ Object
Send data using specified connection
Implementation of RJR::Node#send_msg
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# File 'lib/rjr/nodes/tcp.rb', line 129 def send_msg(data, connection) connection.send_msg(data) end |
#to_s ⇒ Object
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# File 'lib/rjr/nodes/tcp.rb', line 122 def to_s "RJR::Nodes::TCP<#{@node_id},#{@host},#{@port}>" end |