src/apps/cortex/support/observe.cpp

   1 /*
   2  * Copyright (c) 1999-2000, Eric Moon.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions, and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions, and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. The name of the author may not be used to endorse or promote products
  17  *    derived from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21  * OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  23  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  24  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  27  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31
  32 // observe.cpp
  33
  34 #include "observe.h"
  35
  36 #include <Debug.h>
  37 #include <Message.h>
  38
  39 //__USE_CORTEX_NAMESPACE
  40
  41 // -------------------------------------------------------- //
  42 // *** HELPERS ***
  43 // -------------------------------------------------------- //
  44
  45 // * Asynchronous
  46
  47 status_t __CORTEX_NAMESPACE__ add_observer(
  48         const BMessenger&                               observer,
  49         const BMessenger&                               target) {
  50 //      ASSERT(observer.IsValid());
  51 //      ASSERT(target.IsValid());
  52
  53         BMessage m(M_ADD_OBSERVER);
  54         m.AddMessenger("observer", observer);
  55         return target.SendMessage(&m, observer);
  56 }
  57
  58 status_t __CORTEX_NAMESPACE__ remove_observer(
  59         const BMessenger&                               observer,
  60         const BMessenger&                               target) {
  61 //      ASSERT(observer.IsValid());
  62 //      ASSERT(target.IsValid());
  63
  64         BMessage m(M_REMOVE_OBSERVER);
  65         m.AddMessenger("observer", observer);
  66         return target.SendMessage(&m, observer);
  67 }
  68
  69 // * Synchronous
  70
  71 status_t __CORTEX_NAMESPACE__ add_observer(
  72         const BMessenger&                               observer,
  73         const BMessenger&                               target,
  74         BMessage&                                                               reply,
  75         bigtime_t                                                               timeout) {
  76 //      ASSERT(observer.IsValid());
  77 //      ASSERT(target.IsValid());
  78
  79         BMessage m(M_ADD_OBSERVER);
  80         m.AddMessenger("observer", observer);
  81         return target.SendMessage(&m, &reply, timeout);
  82 }
  83
  84 status_t __CORTEX_NAMESPACE__ remove_observer(
  85         const BMessenger&                               observer,
  86         const BMessenger&                               target,
  87         BMessage&                                                               reply,
  88         bigtime_t                                                               timeout) {
  89 //      ASSERT(observer.IsValid());
  90 //      ASSERT(target.IsValid());
  91
  92         BMessage m(M_REMOVE_OBSERVER);
  93         m.AddMessenger("observer", observer);
  94         return target.SendMessage(&m, &reply, timeout);
  95 }
  96
  97 // END -- observe.cpp --