Package com.ericsson.otp.erlang

Class AbstractNode

java.lang.Object
com.ericsson.otp.erlang.AbstractNode
All Implemented Interfaces:
OtpTransportFactory
Direct Known Subclasses:
OtpLocalNode, OtpPeer
public class AbstractNode extends Object implements OtpTransportFactory

Represents an OTP node.

About nodenames: Erlang nodenames consist of two components, an alivename and a hostname separated by '@'. Additionally, there are two nodename formats: short and long. Short names are of the form "alive@hostname", while long names are of the form "alive@host.fully.qualified.domainname". Erlang has special requirements regarding the use of the short and long formats, in particular they cannot be mixed freely in a network of communicating nodes, however Jinterface makes no distinction. See the Erlang documentation for more information about nodenames.

The constructors for the AbstractNode classes will create names exactly as you provide them as long as the name contains '@'. If the string you provide contains no '@', it will be treated as an alivename and the name of the local host will be appended, resulting in a shortname. Nodenames longer than 255 characters will be truncated without warning.

Upon initialization, this class attempts to read the file .erlang.cookie in the user's home directory, and uses the trimmed first line of the file as the default cookie by those constructors lacking a cookie argument. If for any reason the file cannot be found or read, the default cookie will be set to the empty string (""). The location of a user's home directory is determined using the system property "user.home", which may not be automatically set on all platforms.

Instances of this class cannot be created directly, use one of the subclasses instead.

  • Constructor Details

    • AbstractNode

      protected AbstractNode(OtpTransportFactory transportFactory)

    • AbstractNode

      protected AbstractNode(String node)
      Create a node with the given name and default cookie and transport factory.

    • AbstractNode

      protected AbstractNode(String node, OtpTransportFactory transportFactory)
      Create a node with the given name, transport factory and the default cookie.

    • AbstractNode

      protected AbstractNode(String name, String cookie)
      Create a node with the given name, cookie and default transport factory.

    • AbstractNode

      protected AbstractNode(String name, String cookie, OtpTransportFactory transportFactory)
      Create a node with the given name, cookie and transport factory.

  • Method Details

    • node

      public String node()
      Get the name of this node.
      Returns:
      the name of the node represented by this object.

    • host

      public String host()
      Get the hostname part of the nodename. Nodenames are composed of two parts, an alivename and a hostname, separated by '@'. This method returns the part of the nodename following the '@'.
      Returns:
      the hostname component of the nodename.

    • alive

      public String alive()
      Get the alivename part of the hostname. Nodenames are composed of two parts, an alivename and a hostname, separated by '@'. This method returns the part of the nodename preceding the '@'.
      Returns:
      the alivename component of the nodename.

    • cookie

      public String cookie()
      Get the authorization cookie used by this node.
      Returns:
      the authorization cookie used by this node.

    • setCookie

      public String setCookie(String cookie)
      Set the authorization cookie used by this node.
      Returns:
      the previous authorization cookie used by this node.

    • toString

      public String toString()
      Overrides:
      toString in class Object

    • createTransport

      public OtpTransport createTransport(String addr, int port) throws IOException
      Description copied from interface: OtpTransportFactory
      Create instance of OtpTransport
      Specified by:
      createTransport in interface OtpTransportFactory
      Parameters:
      addr - host name or IP address string
      port - port number
      Returns:
      new socket object
      Throws:
      IOException

    • createTransport

      public OtpTransport createTransport(InetAddress addr, int port) throws IOException
      Description copied from interface: OtpTransportFactory
      Create instance of OtpTransport
      Specified by:
      createTransport in interface OtpTransportFactory
      Parameters:
      addr - peer address
      port - port number
      Returns:
      new socket object
      Throws:
      IOException

    • createServerTransport

      public OtpServerTransport createServerTransport(int port) throws IOException
      Description copied from interface: OtpTransportFactory
      Create instance of OtpServerTransport
      Specified by:
      createServerTransport in interface OtpTransportFactory
      Parameters:
      port - port number to listen on
      Returns:
      new socket object
      Throws:
      IOException