+++ /dev/null
-package org.vamsas.client.picking;\r
-\r
-import java.net.*;\r
-import java.util.*;\r
-import java.util.logging.*;\r
-\r
-/**\r
- * Manager class that maintains a list of connected clients in addition to\r
- * attempting to run a server to listen for client connections. If the server\r
- * initialization fails, then an attempt to connect (as a client) to another JVM\r
- * that is already a server happens instead.\r
- */\r
-public class PickManager\r
-{\r
- private static Logger logger = Logger.getLogger("org.vamsas.client.picking");\r
- \r
- // Maintains a list of client communication objects - each object represents\r
- // a way of talking to either:\r
- // the server - if this is client side (and in which case, the list will only contain one element\r
- // the other clients - if this is server side\r
- private LinkedList clients;\r
- \r
- private PickServer server;\r
- \r
- /**\r
- * Constructs a new PickManager. This method will return immediately, while\r
- * a looping thread runs that attempts to run the server or connect to an\r
- * existing server.\r
- */\r
- public PickManager()\r
- {\r
- server = new PickServer(this);\r
- clients = new LinkedList();\r
- \r
- new InitializeThread().start();\r
- }\r
- \r
- /**\r
- * Attempts to establish a connection between two client endpoints. This\r
- * method is called in two ways: 1) by the server when it receives a remote\r
- * request (in which case the socket will already be established) and 2) by\r
- * a client that is attempting to connect *to* the server.\r
- * @param socket a socket endpoint for the connection\r
- * @return true if the connection is successfully, false otherwise\r
- */\r
- boolean addEndPoint(Socket socket)\r
- {\r
- PickEndPoint client = new PickEndPoint(this, socket);\r
- \r
- if (client.openConnection())\r
- {\r
- clients.add(client);\r
- logger.fine("List now contains " + clients.size() + " client(s)");\r
- return true;\r
- }\r
- \r
- return false;\r
- }\r
- \r
- /**\r
- * Sends a message to other clients.\r
- * @param str the message to send\r
- */\r
- public void sendMessage(String str)\r
- {\r
- forwardMessage(null, str);\r
- }\r
- \r
- /**\r
- * Forwards (or sends) a message. When the server (client A) receives a\r
- * message from client B, it must also forward it to clients C and D (etc),\r
- * but mustn't forward it *back* to client B.\r
- * @param origin the client endpoint that received the message (will be null\r
- * if the message originates from this instance\r
- * @param str the message to send\r
- */\r
- private void forwardMessage(PickEndPoint origin, String str)\r
- {\r
- ListIterator itor = clients.listIterator();\r
- while (itor.hasNext())\r
- {\r
- PickEndPoint client = (PickEndPoint) itor.next();\r
- \r
- if (client != origin)\r
- client.send(str);\r
- }\r
- }\r
- \r
- /**\r
- * Handles a received message. If the manager is running in server mode,\r
- * then it must ensure the message is also forwarded to the other clients.\r
- * @param origin the client endpoint that received the message\r
- * @str the message that was received\r
- */\r
- void handleMessage(PickEndPoint origin, String str)\r
- {\r
- if (server.isServer())\r
- forwardMessage(origin, str);\r
- \r
- // TODO: pass message to VAMSAS API\r
- }\r
- \r
- /**\r
- * Removes a client connection from the list when its connection is no\r
- * longer valid.\r
- * @param client the client endpoint to remove\r
- */\r
- void removeEndPoint(PickEndPoint client)\r
- {\r
- clients.remove(client);\r
- logger.fine("List now contains " + clients.size() + " client(s)");\r
- \r
- // If there's no endpoints left, then we've lost all connections and\r
- // need to reinitialize\r
- if (clients.size() == 0)\r
- new InitializeThread().start();\r
- }\r
- \r
- /**\r
- * Thread extension class to handle the actual initialization\r
- */\r
- private class InitializeThread extends Thread\r
- {\r
- public void run()\r
- {\r
- logger.fine("Initializing connection...");\r
- boolean connected = false;\r
- \r
- // Loop until we can get a connection (one way or the other)\r
- while (!connected)\r
- {\r
- // Sleep for a rnd time so we don't end up with all the VAMSAS\r
- // apps trying to initialize servers at the same time\r
- try { Thread.sleep((int)Math.random()); }\r
- catch (InterruptedException e) {}\r
- \r
- // Attempt to open the server port...\r
- if (server.isServer() || server.createServer())\r
- connected = true;\r
-\r
- // If it fails, then attempt to make a client connection...\r
- else if (addEndPoint(null))\r
- connected = true;\r
- }\r
- }\r
- }\r
-}
\ No newline at end of file
git://source.jalview.org / vamsas.git / blobdiff