Middleware Configuration

Overview
Configuration

Overview 

The Vector SIL Kit uses an internal middleware for message exchange. This middleware is open source and included in the sources of the Vector SIL Kit.

The middleware can be configured as follows.

Configuration 

For the initial discovery of the SIL Kit participants, the SIL Kit uses a central registry process at a preconfigured hostname and port. By default, the registry is expected to be running on ‘localhost’ listening on port 8500. These values can be changed via the RegistryUri, for example:

Middleware:
  RegistryUri: silkit://localhost:8500
  ConnectAttempts: 1
  TcpNoDelay: false
  TcpQuickAck: false
  TcpSendBufferSize: 1024
  TcpReceiveBufferSize: 1024
  RegistryAsFallbackProxy: false
  ConnectTimeoutSeconds: 5.0

Table 20 Middleware Configuration
Property Name	Description
RegistryUri	The URI used by participants when connecting to the SIL Kit Registry. By default, the registry is expected to be running on ‘localhost’ with port 8500. The URI uses a scheme of ‘silkit’, i.e., `silkit://localhost:8500`.
ConnectAttempts	Number of connects to the registry a participant should attempt before giving up and signaling an error. By default, only a single connect is attempted.
TcpNoDelay	Enable the TCP_NODELAY flag on TCP sockets. This disables Nagle’s algorithm.
TcpQuickAck	Enable the TCP_QUICKACK flag on TCP sockets (Linux only). Disables delayed acknowledges, at the cost of increased syscall overhead.
TcpSendBufferSize	Sets the TCP send buffer size. Be careful when changing the OS defaults!
TcpReceiveBufferSize	Sets the TCP receive buffer size. Be careful when changing the OS defaults!
AcceptorUris	Overwrite the default acceptor URIs of the participant. The configuration field exists to support more complicated network setups, where the listening ports of the participant must have a known, fixed port number and address. It is not required to set this field under normal circumstances.
RegistryAsFallbackProxy	Disable using the registry as a proxy for participant-to-participant communication as a fallback, if the direct connection attempts fail. The feature is enabled by default and can be disabled explicitly via this field. It is not required to set this field under normal circumstances.
ConnectTimeoutSeconds	The timeout (in seconds) until a connection attempt is aborted or a handshake is considered failed. This timeout applies to each attempt (TCP, Local-Domain) individually. It is not required to set this field under normal circumstances.