Module Netplex_types

module Netplex_types: sig .. end

Types for Netplex

type encap = Netplex_encap.encap

type param_value = [ `Bool of bool | `Float of float | `Int of int | `String of string ]

type param_value_or_any = [ `Any of exn
       | `Bool of bool
       | `Encap of encap
       | `Float of float
       | `Int of int
       | `String of string ]

type level = [ `Alert | `Crit | `Debug | `Emerg | `Err | `Info | `Notice | `Warning ]

Log levels, modeled after syslog

class type logger = object .. end

A logger receives log messages

type parallelization_type = [ `Controller_attached | `Multi_processing | `Multi_threading ]

Type of parallelization:

`Multi_processing on a single host
`Multi_threading on a single host
`Controller_attached means that the service runs within the controller. This is (for now) only allowed for controller-internal services.

type thread_sys_id = [ `Process of int | `Thread of int ]

A system-specific identifier of the thread/process

type socket_state = [ `Disabled | `Down | `Enabled | `Restarting of bool ]

The state of a socket:

`Enabled: The controller allows containers to accept connections. Note that this does not necessarily means that there such containers.
`Disabled: It is not allowed to accept new connections. The socket is kept open, however.
`Restarting b: The containers are being restarted. The boolean argument says whether the socket will be enabled after that.
`Down: The socket is down/closed

type container_id = < socket_service_name : string >

Such objects identify containers. As additional info, the method socket_service_name returns the name of the socket service the container implements

type container_state = [ `Accepting of int * float | `Busy | `Shutting_down | `Starting of float ]

The container state for workload management:

`Accepting(n,t): The container is accepting further connections. It currently processes n connections. The last connection was accepted at time t (seconds since the epoch).
`Busy: The container does not accept connections
`Starting t: The container was started at time t and is not yet ready.
`Shutting_down: The container is being shutted down.

type capacity = [ `Low_quality of int | `Normal_quality of int | `Unavailable ]

How many connections a container can accept in addition to the existing connections:

`Normal_quality n: It can accept n connections with normal service quality, n > 0
`Low_quality n: It can accept n connections with low service quality (e.g. because it is already quite loaded), n > 0
`Unavailable: No capacity free

type extended_address = [ `Container of
           string * string * string * [ `Any | `Process of int | `Thread of int ]
       | `Socket of Unix.sockaddr
       | `Socket_file of string
       | `W32_pipe of string
       | `W32_pipe_file of string ]

Possible addresses:

`Socket s: The socket at this socket address
`Socket_file f: The file f contains the (anonymous) port number of a socket bound to 127.0.0.1 (This is meant as substitute for Unix Domain sockets on Win32.)
`W32_pipe name: The Win32 pipe with this name which must be of the form "\\.\pipe\<pname>"
`W32_pipe_file f: The file f contains the (random) name of a Win32 pipe
`Container(socket_dir,service_name,proto_name,thread_id): The special endpoint of the container for service_name that is running as thread_id. It is system-dependent what this endpoint "is" in reality, usually a socket or named pipe. If any container of a service is meant, the value `Any is substituted as a placeholder for a not yet known thread_id.

class type controller = object .. end

The controller is the object in the Netplex master process/thread that manages the containers, logging, and service definitions

class type controller_config = object .. end

class type socket_service = object .. end

class type socket_service_config = object .. end

class type protocol = object .. end

class type socket_controller = object .. end

class type ctrl_message_receiver = object .. end

class type processor_hooks = object .. end

Processor hooks can be used to modify the behavior of a processor.

class type processor = object .. end

The processor is the object that is notified when a new TCP connection is accepted.

class type container = object .. end

Containers encapsulate the control flow of the service components.

class type workload_manager = object .. end

See Netplex_workload for definitions of workload managers

class type plugin = object .. end

Plugins are extensions of the Netplex system that run in the controller and can be invoked from containers

class type par_thread = object .. end

class type parallelizer = object .. end

type config_tree = [ `Parameter of address * string * param_value
       | `Section of address * string * config_tree list ]

type address = <  >

class type config_file = object .. end

class type processor_factory = object .. end

class type workload_manager_factory = object .. end

class type logger_factory = object .. end

class type netplex_config = object .. end

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