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Now it's easier to determine which class really uses which other class git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@82 6c8d7289-2bf4-0310-a012-ef5d649a1542
117 lines
5.4 KiB
Java
117 lines
5.4 KiB
Java
// serverHandler.java
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// -------------------------------------------
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2004
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// last major change: 05.04.2004
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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/*
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serverHandler:
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A Generic Server becomes a server for s specific protocol by impementation of
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a corresponding handler class. The handler class provides methods for each
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command of the protocol that is implemented.
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The Handler class is assigned to the serverCore by passing the handlers
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name to the serverCore upon initialization.
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Example:
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serverCore server = new serverCore(port, 1000, 0, false, "ftpdProtocol", null, 0);
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In this example the protocol handler "ftpdProtocol" is assigned. There a class
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named ftpdProtocol.java must be implemented, that implements this interface,
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a serverHandler.
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Any protocol command can be implemented in either way:
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public String COMMAND(String arg) throws IOException;
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public InputStream COMMAND(String arg) throws IOException;
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public void COMMAND(String arg) throws IOException;
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..where COMMAND is the command that had been passed to the server
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on the terminal connection. The 'arg' argument is the remaining part of
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the command on the terminal connection.
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If the handler method returns a NULL value, which is especially
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the case if the method implements a 'void' return-value method,
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then the server disconnects the connection.
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Any other return value (String or an InputStream) is returned to
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the client on it's own line through the terminal connection.
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If it is wanted that the server terminates right after submitting
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a last line, then this can be indicated by prefixing the return
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value by a '!'-character.
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If one of the command methods throws a IOException, then the
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server asks the error - method for a return value on the terminal
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connection.
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The greeting-method is used to request a string that is transmitted
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to the client as terminal output at the beginning of a connection
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session.
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*/
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package de.anomic.server;
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public interface serverHandler {
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// init method for static variables of the handler
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// this method shall be called only once
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// information that is passed here is cloned for every new instance
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//public void initHandler(serverSwitch switchboard) throws java.io.IOException;
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// an init method that the server calls to provide hooks and
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// information to the session's sockets and information
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// the Switchboard allowes to trigger events through all sessions
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// and an supervision process.
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// this method shall be called only once
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public void initSession(serverCore.Session session) throws java.io.IOException;
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// a response line upon connection is send to client
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// if no response line is wanted, return "" or null
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public String greeting();
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// return string in case of any error that occurs during communication
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// is always (but not only) called if an IO-dependent exception occurs.
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public String error(Throwable e);
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// clone method for the handler prototype
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// each time a server makes a new connection it clones the hanlder prototype
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// the clone method does not need to clone every detail of a handler connection,
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// but only the necessary one for a newly initialized instance
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public Object clone();
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// Instead of using clone this function can be used to reset an existing
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// handler prototype so that it can e reused
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public void reset();
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}
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