Package org.jcsp.lang
Class AltingConnectionServerImpl
java.lang.Object
org.jcsp.lang.Guard
org.jcsp.lang.AltingConnectionServer
org.jcsp.lang.AltingConnectionServerImpl
- All Implemented Interfaces:
ConnectionServer
This class does not need to be used by standard JCSP users. It is exposed so that the connection
mechanism can be extended for custom connections.
- Author:
- Quickstone Technologies Limited
-
Field Summary
FieldsModifier and TypeFieldDescriptionprotected static final int
Server state.protected static final int
Server state.protected static final int
Server state.Fields inherited from interface org.jcsp.lang.ConnectionServer
FACTORY
-
Constructor Summary
ConstructorsModifierConstructorDescriptionprotected
AltingConnectionServerImpl
(AltingChannelInput openIn, AltingChannelInput furtherRequestIn) Constructs a new server instance. -
Method Summary
Modifier and TypeMethodDescriptionprotected int
void
Sends some data back to the client after a request has been received but keeps the connection open.void
Sends some data back to the client after a request has been received.void
replyAndClose
(Object data) Sends some data back to the client and closes the connection.request()
Receives some data from a client once a connection has been established.Methods inherited from class org.jcsp.lang.AltingConnectionServer
getAltingChannel, pending, setAltingChannel
-
Field Details
-
SERVER_STATE_CLOSED
protected static final int SERVER_STATE_CLOSEDServer state. The server is initially CLOSED the first request will take it to the RECEIVED state. A reply will take it back to OPEN or CLOSED depending on the mode of reply. From the OPEN or CLOSED state a further request can occur.- See Also:
-
SERVER_STATE_OPEN
protected static final int SERVER_STATE_OPENServer state. The server is initially CLOSED the first request will take it to the RECEIVED state. A reply will take it back to OPEN or CLOSED depending on the mode of reply. From the OPEN or CLOSED state a further request can occur.- See Also:
-
SERVER_STATE_RECEIVED
protected static final int SERVER_STATE_RECEIVEDServer state. The server is initially CLOSED the first request will take it to the RECEIVED state. A reply will take it back to OPEN or CLOSED depending on the mode of reply. From the OPEN or CLOSED state a further request can occur.- See Also:
-
-
Constructor Details
-
AltingConnectionServerImpl
protected AltingConnectionServerImpl(AltingChannelInput openIn, AltingChannelInput furtherRequestIn) Constructs a new server instance. This must be called by a subclass which is responsible for creating the channels.
-
-
Method Details
-
request
Receives some data from a client once a connection has been established. This will block until the client callsrequest(Object)
but by establishing a connection.- Returns:
- the
Object
sent by the client. - Throws:
IllegalStateException
-
reply
Sends some data back to the client after a request has been received but keeps the connection open. After calling this method, the server should callrecieve()
to receive a further request.- Parameters:
data
- the data to send to the client.- Throws:
IllegalStateException
-
reply
Sends some data back to the client after a request has been received. The closed parameter indicates whether or not the connection should be closed. The connection will be closed iff close istrue
.- Parameters:
data
- the data to send to the client.close
-boolean
indicating whether or not the connection should be closed.- Throws:
IllegalStateException
-
replyAndClose
Sends some data back to the client and closes the connection. This method will not block. After calling this method, the server may callaccept()
in order to allow another connection to this server to be established. If this method did not take any data to send back to the client, and the server was meant to callreply(Object)
followed by aclose()
, then there would be a race hazard at the client as it would not know whether the connection had remained open or not.- Parameters:
data
- the data to send back to client.- Throws:
IllegalStateException
-
getServerState
protected int getServerState()
-