/interpreter/tags/at_build150307/src/edu/vub/at/actors/net/cmd/CMDInitRequireServices.java

http://ambienttalk.googlecode.com/ · Java · 83 lines · 29 code · 10 blank · 44 comment · 0 complexity · 8f48cf1f63f51f8156a3710a1d091643 MD5 · raw file

  1. /**
  2. * AmbientTalk/2 Project
  3. * VMInitialDiscovery.java created on 22-feb-2007 at 13:20:13
  4. * (c) Programming Technology Lab, 2006 - 2007
  5. * Authors: Tom Van Cutsem & Stijn Mostinckx
  6. *
  7. * Permission is hereby granted, free of charge, to any person
  8. * obtaining a copy of this software and associated documentation
  9. * files (the "Software"), to deal in the Software without
  10. * restriction, including without limitation the rights to use,
  11. * copy, modify, merge, publish, distribute, sublicense, and/or
  12. * sell copies of the Software, and to permit persons to whom the
  13. * Software is furnished to do so, subject to the following
  14. * conditions:
  15. *
  16. * The above copyright notice and this permission notice shall be
  17. * included in all copies or substantial portions of the Software.
  18. *
  19. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  20. * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  21. * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  22. * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  23. * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  24. * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  25. * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  26. * OTHER DEALINGS IN THE SOFTWARE.
  27. */
  28. package edu.vub.at.actors.net.cmd;
  29. import edu.vub.at.actors.natives.ELVirtualMachine;
  30. import edu.vub.at.actors.net.Logging;
  31. import java.util.Set;
  32. import org.jgroups.Address;
  33. import org.jgroups.Message;
  34. import org.jgroups.SuspectedException;
  35. import org.jgroups.TimeoutException;
  36. import org.jgroups.blocks.MessageDispatcher;
  37. /**
  38. * A CMDInitRequireServices message is sent asynchronously to any VM just discovered in the environment
  39. * if thhe discovering VM has some open subscriptions. This command is sent to the discovered VM to ask
  40. * it whether it has any publications matching the outstanding subscriptions at the sender VM.
  41. *
  42. * SENDER: the discovering VM
  43. * RECEIVER: the discovered VM
  44. * MODE: ASYNCHRONOUS, UNICAST
  45. * PROPERTIES: outstanding subscription topics of sender
  46. * REPLY: potential CMDJoinServices
  47. *
  48. * @author tvcutsem
  49. */
  50. public class CMDInitRequireServices extends VMCommand {
  51. /**
  52. * A Set of Packet objects representing serialized ATStripe topics.
  53. */
  54. private final Set topics_;
  55. public CMDInitRequireServices(Set topics) {
  56. super("initRequireServices");
  57. topics_ = topics;
  58. }
  59. public void send(MessageDispatcher dispatcher, Address recipientVM) {
  60. try {
  61. super.sendAsyncUnicast(dispatcher, recipientVM);
  62. } catch (TimeoutException e) {
  63. Logging.VirtualMachine_LOG.warn(this + ": timeout while trying to transmit discovery query, dropping");
  64. } catch (SuspectedException e) {
  65. Logging.VirtualMachine_LOG.warn(this + ": remote VM suspected while sending discovery query");
  66. }
  67. }
  68. public Object uponReceiptBy(ELVirtualMachine remoteHost, Message wrapper) throws Exception {
  69. // query local discoverymanager for matching topics
  70. remoteHost.discoveryActor_.event_receiveNewSubscriptionsFrom(topics_, wrapper.getSrc());
  71. return null;
  72. }
  73. }