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com.ericsson.otp.erlang
Class AbstractNode

java.lang.Object
  extended by com.ericsson.otp.erlang.AbstractNode
All Implemented Interfaces:
OtpTransportFactory
Direct Known Subclasses:
OtpLocalNode, OtpPeer

public class AbstractNode
extends java.lang.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 Summary
protected AbstractNode(OtpTransportFactory transportFactory)
           
protected AbstractNode(java.lang.String node)
          Create a node with the given name and default cookie and transport factory.
protected AbstractNode(java.lang.String node, OtpTransportFactory transportFactory)
          Create a node with the given name, transport factory and the default cookie.
protected AbstractNode(java.lang.String name, java.lang.String cookie)
          Create a node with the given name, cookie and default transport factory.
protected AbstractNode(java.lang.String name, java.lang.String cookie, OtpTransportFactory transportFactory)
          Create a node with the given name, cookie and transport factory.
 
Method Summary
 java.lang.String alive()
          Get the alivename part of the hostname.
 java.lang.String cookie()
          Get the authorization cookie used by this node.
 OtpServerTransport createServerTransport(int port)
          Create instance of OtpServerTransport
 OtpTransport createTransport(java.net.InetAddress addr, int port)
          Create instance of OtpTransport
 OtpTransport createTransport(java.lang.String addr, int port)
          Create instance of OtpTransport
 java.lang.String host()
          Get the hostname part of the nodename.
 java.lang.String node()
          Get the name of this node.
 java.lang.String setCookie(java.lang.String cookie)
          Set the authorization cookie used by this node.
 java.lang.String toString()
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

AbstractNode

protected AbstractNode(OtpTransportFactory transportFactory)

AbstractNode

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


AbstractNode

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


AbstractNode

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


AbstractNode

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

Method Detail

node

public java.lang.String node()
Get the name of this node.

Returns:
the name of the node represented by this object.

host

public java.lang.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 java.lang.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 java.lang.String cookie()
Get the authorization cookie used by this node.

Returns:
the authorization cookie used by this node.

setCookie

public java.lang.String setCookie(java.lang.String cookie)
Set the authorization cookie used by this node.

Returns:
the previous authorization cookie used by this node.

toString

public java.lang.String toString()
Overrides:
toString in class java.lang.Object

createTransport

public OtpTransport createTransport(java.lang.String addr,
                                    int port)
                             throws java.io.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:
java.io.IOException

createTransport

public OtpTransport createTransport(java.net.InetAddress addr,
                                    int port)
                             throws java.io.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:
java.io.IOException

createServerTransport

public OtpServerTransport createServerTransport(int port)
                                         throws java.io.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:
java.io.IOException