You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
117 lines
5.4 KiB
117 lines
5.4 KiB
// serverHandler.java
|
|
// -------------------------------------------
|
|
// (C) by Michael Peter Christen; mc@anomic.de
|
|
// first published on http://www.anomic.de
|
|
// Frankfurt, Germany, 2004
|
|
// last major change: 05.04.2004
|
|
//
|
|
// This program is free software; you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation; either version 2 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program; if not, write to the Free Software
|
|
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
//
|
|
// Using this software in any meaning (reading, learning, copying, compiling,
|
|
// running) means that you agree that the Author(s) is (are) not responsible
|
|
// for cost, loss of data or any harm that may be caused directly or indirectly
|
|
// by usage of this softare or this documentation. The usage of this software
|
|
// is on your own risk. The installation and usage (starting/running) of this
|
|
// software may allow other people or application to access your computer and
|
|
// any attached devices and is highly dependent on the configuration of the
|
|
// software which must be done by the user of the software; the author(s) is
|
|
// (are) also not responsible for proper configuration and usage of the
|
|
// software, even if provoked by documentation provided together with
|
|
// the software.
|
|
//
|
|
// Any changes to this file according to the GPL as documented in the file
|
|
// gpl.txt aside this file in the shipment you received can be done to the
|
|
// lines that follows this copyright notice here, but changes must not be
|
|
// done inside the copyright notive above. A re-distribution must contain
|
|
// the intact and unchanged copyright notice.
|
|
// Contributions and changes to the program code must be marked as such.
|
|
|
|
/*
|
|
serverHandler:
|
|
|
|
A Generic Server becomes a server for s specific protocol by impementation of
|
|
a corresponding handler class. The handler class provides methods for each
|
|
command of the protocol that is implemented.
|
|
The Handler class is assigned to the serverCore by passing the handlers
|
|
name to the serverCore upon initialization.
|
|
Example:
|
|
serverCore server = new serverCore(port, 1000, 0, false, "ftpdProtocol", null, 0);
|
|
In this example the protocol handler "ftpdProtocol" is assigned. There a class
|
|
named ftpdProtocol.java must be implemented, that implements this interface,
|
|
a serverHandler.
|
|
Any protocol command can be implemented in either way:
|
|
|
|
public String COMMAND(String arg) throws IOException;
|
|
public InputStream COMMAND(String arg) throws IOException;
|
|
public void COMMAND(String arg) throws IOException;
|
|
|
|
..where COMMAND is the command that had been passed to the server
|
|
on the terminal connection. The 'arg' argument is the remaining part of
|
|
the command on the terminal connection.
|
|
If the handler method returns a NULL value, which is especially
|
|
the case if the method implements a 'void' return-value method,
|
|
then the server disconnects the connection.
|
|
Any other return value (String or an InputStream) is returned to
|
|
the client on it's own line through the terminal connection.
|
|
If it is wanted that the server terminates right after submitting
|
|
a last line, then this can be indicated by prefixing the return
|
|
value by a '!'-character.
|
|
|
|
If one of the command methods throws a IOException, then the
|
|
server asks the error - method for a return value on the terminal
|
|
connection.
|
|
|
|
The greeting-method is used to request a string that is transmitted
|
|
to the client as terminal output at the beginning of a connection
|
|
session.
|
|
*/
|
|
|
|
package de.anomic.server;
|
|
|
|
|
|
public interface serverHandler {
|
|
|
|
// init method for static variables of the handler
|
|
// this method shall be called only once
|
|
// information that is passed here is cloned for every new instance
|
|
//public void initHandler(serverSwitch switchboard) throws java.io.IOException;
|
|
|
|
// an init method that the server calls to provide hooks and
|
|
// information to the session's sockets and information
|
|
// the Switchboard allowes to trigger events through all sessions
|
|
// and an supervision process.
|
|
// this method shall be called only once
|
|
public void initSession(serverCore.Session session) throws java.io.IOException;
|
|
|
|
// a response line upon connection is send to client
|
|
// if no response line is wanted, return "" or null
|
|
public String greeting();
|
|
|
|
// return string in case of any error that occurs during communication
|
|
// is always (but not only) called if an IO-dependent exception occurs.
|
|
public String error(Throwable e);
|
|
|
|
// clone method for the handler prototype
|
|
// each time a server makes a new connection it clones the hanlder prototype
|
|
// the clone method does not need to clone every detail of a handler connection,
|
|
// but only the necessary one for a newly initialized instance
|
|
public Object clone();
|
|
|
|
// Instead of using clone this function can be used to reset an existing
|
|
// handler prototype so that it can e reused
|
|
public void reset();
|
|
|
|
}
|