| /******************************************************************************* |
| * Copyright (c) 2001, 2004 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jem.internal.proxy.remote; |
| /* |
| * $RCSfile: REMMasterServerThread.java,v $ |
| * $Revision: 1.5 $ $Date: 2004/08/27 15:35:20 $ |
| */ |
| |
| import java.io.*; |
| import java.net.*; |
| |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.jem.internal.proxy.core.ProxyPlugin; |
| import org.eclipse.jem.internal.proxy.common.remote.Commands; |
| |
| /** |
| * Master Server thread for the Remote VMs. |
| * |
| * It responds to the remote vm requests to this IDE. |
| * |
| * It is package-protected because only ProxyRemotePluguin should access it. |
| * @author richkulp |
| */ |
| class REMMasterServerThread extends Thread { |
| |
| protected ServerSocket masterServerSocket; |
| protected REMRegistryController registryController; |
| protected boolean shuttingDown = false; |
| |
| // Kludge: Bug in Linux 1.3.xxx of JVM. Closing a socket while the socket is being read/accept will not interrupt the |
| // wait. Need to timeout to the socket read/accept before the socket close will be noticed. This has been fixed |
| // in Linux 1.4. So on Linux 1.3 need to put timeouts in on those sockets that can be separately closed while reading/accepting. |
| static boolean LINUX_1_3 = "linux".equalsIgnoreCase(System.getProperty("os.name")) && System.getProperty("java.version","").startsWith("1.3"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$ |
| |
| |
| public REMMasterServerThread(REMRegistryController registryController) { |
| super("Remote Proxy Master Server Thread"); //$NON-NLS-1$ |
| this.registryController = registryController; |
| |
| try { |
| masterServerSocket = new ServerSocket(0, 50, InetAddress.getByName("localhost")); // Any available port //$NON-NLS-1$ |
| if (LINUX_1_3) |
| masterServerSocket.setSoTimeout(1000); // Linux 1.3 bug, see comment on LINUX_1_3 |
| } catch (SocketException e) { |
| ProxyPlugin.getPlugin().getLogger().log(new Status(IStatus.ERROR, ProxyPlugin.getPlugin().getBundle().getSymbolicName(), 0, "", e)); // This is bad. Should be no exceptions creating a socket. |
| } catch (IOException e) { |
| ProxyPlugin.getPlugin().getLogger().log(new Status(IStatus.ERROR, ProxyPlugin.getPlugin().getBundle().getSymbolicName(), 0, "", e)); // This is bad. Should be no exceptions creating a socket. |
| } |
| } |
| |
| public ServerSocket getMasterSocket() { |
| return masterServerSocket; |
| } |
| |
| /** |
| * @see java.lang.Thread#run() |
| */ |
| public void run() { |
| try { |
| while (masterServerSocket != null) { |
| Socket incoming = null; |
| try { |
| incoming = masterServerSocket.accept(); |
| } catch (InterruptedIOException e) { |
| continue; // Timeout, try again |
| } catch (NullPointerException e) { |
| continue; // In Linux 1.3 case masterServerSocket could of gone null between loop test and try block. |
| } |
| boolean close = false; // process request will tell if socket should be closed. it may be passed onto callback thread instead. |
| try { |
| close = processRequest(incoming); |
| } finally { |
| if (close) { |
| try { |
| incoming.close(); |
| } catch (IOException e) { |
| } |
| } |
| } |
| incoming = null; |
| } |
| } catch (Exception e) { |
| if (!shuttingDown) |
| ProxyPlugin.getPlugin().getLogger().log(new Status(IStatus.ERROR, ProxyPlugin.getPlugin().getBundle().getSymbolicName(), 0, "", e)); |
| } |
| |
| shutdown(); // Either a bad exception or we were closed. Either way is shutdown. |
| } |
| |
| /** |
| * Use this to request a shutdown. |
| */ |
| public void requestShutdown() { |
| if (masterServerSocket == null) |
| return; |
| // Closing the server socket should cause a break. |
| try { |
| shuttingDown = true; |
| masterServerSocket.close(); |
| } catch (Exception e) { |
| } |
| return; |
| } |
| |
| protected boolean processRequest(Socket remote) throws IOException { |
| DataInputStream in = new DataInputStream(remote.getInputStream()); |
| DataOutputStream out = new DataOutputStream(remote.getOutputStream()); |
| boolean close = true; // flag indicating socket not given over to callback. Don't close the socket when done because callback has it. |
| try { |
| byte cmd = in.readByte(); |
| switch (cmd) { |
| case Commands.ALIVE: |
| int registryID = in.readInt(); |
| out.writeBoolean(registryController.getRegistry(new Integer(registryID)) != null); // Return if registry still alive |
| out.flush(); |
| break; |
| |
| case Commands.REMOTE_STARTED: |
| registryID = in.readInt(); |
| int remoteServerPort = in.readInt(); |
| REMProxyFactoryRegistry registry = registryController.getRegistry(new Integer(registryID)); |
| if (registry != null) { |
| registry.setServerPort(remoteServerPort); |
| out.writeBoolean(true); |
| } else |
| out.writeBoolean(false); // No registry |
| out.flush(); |
| break; |
| |
| case Commands.ATTACH_CALLBACK: |
| registryID = in.readInt(); |
| registry = registryController.getRegistry(new Integer(registryID)); |
| if (registry != null) { |
| close = !((REMCallbackRegistry) registry.getCallbackRegistry()).createCallback(remote); // close if failed, don't close if good. |
| out.writeBoolean(!close); // if not close, then return it worked. |
| } else |
| out.writeBoolean(false); |
| out.flush(); |
| break; |
| } |
| } catch (Exception e) { |
| ProxyPlugin.getPlugin().getLogger().log(new Status(IStatus.ERROR, ProxyPlugin.getPlugin().getBundle().getSymbolicName(), 0, "", e)); |
| } finally { |
| if (close) { |
| try { |
| in.close(); |
| } catch (IOException e) { |
| } |
| try { |
| out.close(); |
| } catch (IOException e) { |
| } |
| } |
| } |
| return close; |
| } |
| |
| private void shutdown() { |
| requestShutdown(); |
| masterServerSocket = null; |
| } |
| |
| } |