/interpreter/tags/at2dist110511/src/edu/vub/at/actors/net/cmd/CMDInitRequireServices.java

http://ambienttalk.googlecode.com/ · Java · 74 lines · 19 code · 11 blank · 44 comment · 0 complexity · da52dffeb2b17f2e4a080c9c22a4073a 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.comm.Address;
  31. import edu.vub.at.actors.net.comm.CommunicationBus;
  32. import java.util.Set;
  33. /**
  34. * A CMDInitRequireServices message is sent asynchronously to any VM just discovered in the environment
  35. * if the discovering VM has some open subscriptions. This command is sent to the discovered VM to ask
  36. * it whether it has any publications matching the outstanding subscriptions at the sender VM.
  37. *
  38. * SENDER: the discovering VM
  39. * RECEIVER: the discovered VM
  40. * MODE: ASYNCHRONOUS, UNICAST
  41. * PROPERTIES: outstanding subscription topics of sender
  42. * REPLY: potential CMDJoinServices
  43. *
  44. * @author tvcutsem
  45. */
  46. public class CMDInitRequireServices extends VMCommand {
  47. private static final long serialVersionUID = 7177638111444788771L;
  48. /**
  49. * A Set of Packet objects representing serialized ATTypeTag topics.
  50. */
  51. private final Set topics_;
  52. public CMDInitRequireServices(Set topics) {
  53. super("initRequireServices");
  54. topics_ = topics;
  55. }
  56. public void send(CommunicationBus dispatcher, Address recipientVM) {
  57. dispatcher.sendAsyncUnicast(this, recipientVM);
  58. }
  59. public void uponReceiptBy(ELVirtualMachine remoteHost, Address senderAddress) {
  60. // query local discoverymanager for matching topics
  61. remoteHost.discoveryActor_.event_receiveNewSubscriptionsFrom(topics_, senderAddress);
  62. }
  63. }