src/apps/cortex/support/MultiInvoker.cpp

   1 /*
   2  * Copyright 1999, Be Incorporated.
   3  * Copyright (c) 1999-2000, Eric Moon.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions, and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions, and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. The name of the author may not be used to endorse or promote products
  18  *    derived from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
  21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  22  * OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  24  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  25  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  27  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  28  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32
  33 ////////////////////////////////////////////////////////////
  34 // MultiInvoker.cpp
  35 // ----------------
  36 // Implements the MultiInvoker class.
  37 //
  38
  39 #include <Messenger.h>
  40 #include "MultiInvoker.h"
  41
  42 MultiInvoker::MultiInvoker()
  43 {
  44         m_message = 0;
  45         m_timeout = B_INFINITE_TIMEOUT;
  46         m_replyHandler = 0;
  47 }
  48
  49 MultiInvoker::MultiInvoker(const MultiInvoker& src)
  50 {
  51         Clone(src);
  52 }
  53
  54 MultiInvoker::~MultiInvoker()
  55 {
  56         Clear();
  57 }
  58
  59 MultiInvoker& MultiInvoker::operator=(const MultiInvoker& src)
  60 {
  61         if (this != &src) {
  62                 Clear();
  63                 Clone(src);
  64         }
  65         return *this;
  66 }
  67
  68 void MultiInvoker::Clear()
  69 {
  70         delete m_message;
  71         int32 i=CountTargets();
  72         while (--i >=0) {
  73                 RemoveTarget(i);
  74         }
  75 }
  76
  77 void MultiInvoker::Clone(const MultiInvoker& src)
  78 {
  79         m_message = new BMessage(*src.Message());
  80         int32 len=src.CountTargets();
  81         for (int32 i=0; i<len; i++) {
  82                 AddTarget(src.TargetAt(i));
  83         }
  84         m_timeout = src.Timeout();
  85         m_replyHandler = src.HandlerForReply();
  86 }
  87
  88 void MultiInvoker::SetMessage(BMessage* message)
  89 {
  90         delete m_message;
  91         m_message = message;
  92 }
  93
  94 BMessage* MultiInvoker::Message() const
  95 {
  96         return m_message;
  97 }
  98
  99 uint32 MultiInvoker::Command() const
 100 {
 101         return (m_message) ? m_message->what : 0;
 102 }
 103
 104 status_t MultiInvoker::AddTarget(const BHandler* h, const BLooper* loop)
 105 {
 106         status_t err;
 107         BMessenger* msgr = new BMessenger(h, loop, &err);
 108         if (err == B_OK)
 109                 m_messengers.AddItem(msgr);
 110         else
 111                 delete msgr;
 112         return err;
 113 }
 114
 115 status_t MultiInvoker::AddTarget(BMessenger* msgr)
 116 {
 117         if (msgr) {
 118                 m_messengers.AddItem(msgr);
 119                 return B_OK;
 120         } else {
 121                 return B_BAD_VALUE;
 122         }
 123 }
 124
 125 void MultiInvoker::RemoveTarget(const BHandler* h)
 126 {
 127         int32 i = IndexOfTarget(h);
 128         if (i >= 0)
 129                 RemoveTarget(i);
 130 }
 131
 132 void MultiInvoker::RemoveTarget(int32 index)
 133 {
 134         BMessenger* msgr = static_cast<BMessenger*>
 135                 (m_messengers.RemoveItem(index));
 136         delete msgr;
 137 }
 138
 139 int32 MultiInvoker::IndexOfTarget(const BHandler* h) const
 140 {
 141         int32 len = CountTargets();
 142         for (int32 i=0; i<len; i++) {
 143                 BMessenger* msgr = MessengerAt(i);
 144                 if (msgr && msgr->Target(0) == h) {
 145                         return i;
 146                 }
 147         }
 148         return -1;
 149 }
 150
 151 int32 MultiInvoker::CountTargets() const
 152 {
 153         return m_messengers.CountItems();
 154 }
 155
 156 BHandler* MultiInvoker::TargetAt(int32 index, BLooper** looper) const
 157 {
 158         BMessenger* msgr = MessengerAt(index);
 159         if (msgr) {
 160                 return msgr->Target(looper);
 161         } else {
 162                 if (looper) *looper = 0;
 163                 return 0;
 164         }
 165 }
 166
 167 BMessenger* MultiInvoker::MessengerAt(int32 index) const
 168 {
 169         return static_cast<BMessenger*>
 170                 (m_messengers.ItemAt(index));
 171 }
 172
 173 bool MultiInvoker::IsTargetLocal(int32 index) const
 174 {
 175         BMessenger* msgr = MessengerAt(index);
 176         return (msgr) ? msgr->IsTargetLocal() : false;
 177 }
 178
 179 void MultiInvoker::SetTimeout(bigtime_t timeout)
 180 {
 181         m_timeout = timeout;
 182 }
 183
 184 bigtime_t MultiInvoker::Timeout() const
 185 {
 186         return m_timeout;
 187 }
 188
 189 void MultiInvoker::SetHandlerForReply(BHandler* h)
 190 {
 191         m_replyHandler = h;
 192 }
 193
 194 BHandler* MultiInvoker::HandlerForReply() const
 195 {
 196         return m_replyHandler;
 197 }
 198
 199 status_t MultiInvoker::Invoke(BMessage* msg)
 200 {
 201         BMessage* sendMsg = (msg) ? msg : m_message;
 202         if (! sendMsg)
 203                 return B_BAD_VALUE;
 204
 205         status_t err, finalResult=B_OK;
 206         BMessage replyMsg;
 207         int32 len = CountTargets();
 208         for (int32 i=0; i<len; i++) {
 209                 BMessenger* msgr = MessengerAt(i);
 210                 if (msgr) {
 211                         err = msgr->SendMessage(sendMsg,
 212                                 HandlerForReply(), m_timeout);
 213                         if (err != B_OK) finalResult = err;
 214                 }
 215         }
 216         return finalResult;
 217 }