icuSources/common/servnotf.cpp

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /**
   4  *******************************************************************************
   5  * Copyright (C) 2001-2012, International Business Machines Corporation and    *
   6  * others. All Rights Reserved.                                                *
   7  *******************************************************************************
   8  */
   9
  10 #include "unicode/utypes.h"
  11
  12 #if !UCONFIG_NO_SERVICE
  13
  14 #include "servnotf.h"
  15 #ifdef NOTIFIER_DEBUG
  16 #include <stdio.h>
  17 #endif
  18
  19 U_NAMESPACE_BEGIN
  20
  21 EventListener::~EventListener() {}
  22 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(EventListener)
  23
  24 static UMutex notifyLock = U_MUTEX_INITIALIZER;
  25
  26 ICUNotifier::ICUNotifier(void)
  27 : listeners(NULL)
  28 {
  29 }
  30
  31 ICUNotifier::~ICUNotifier(void) {
  32     {
  33         Mutex lmx(&notifyLock);
  34         delete listeners;
  35         listeners = NULL;
  36     }
  37 }
  38
  39
  40 void
  41 ICUNotifier::addListener(const EventListener* l, UErrorCode& status)
  42 {
  43     if (U_SUCCESS(status)) {
  44         if (l == NULL) {
  45             status = U_ILLEGAL_ARGUMENT_ERROR;
  46             return;
  47         }
  48
  49         if (acceptsListener(*l)) {
  50             Mutex lmx(&notifyLock);
  51             if (listeners == NULL) {
  52                 listeners = new UVector(5, status);
  53             } else {
  54                 for (int i = 0, e = listeners->size(); i < e; ++i) {
  55                     const EventListener* el = (const EventListener*)(listeners->elementAt(i));
  56                     if (l == el) {
  57                         return;
  58                     }
  59                 }
  60             }
  61
  62             listeners->addElement((void*)l, status); // cast away const
  63         }
  64 #ifdef NOTIFIER_DEBUG
  65         else {
  66             fprintf(stderr, "Listener invalid for this notifier.");
  67             exit(1);
  68         }
  69 #endif
  70     }
  71 }
  72
  73 void
  74 ICUNotifier::removeListener(const EventListener *l, UErrorCode& status)
  75 {
  76     if (U_SUCCESS(status)) {
  77         if (l == NULL) {
  78             status = U_ILLEGAL_ARGUMENT_ERROR;
  79             return;
  80         }
  81
  82         {
  83             Mutex lmx(&notifyLock);
  84             if (listeners != NULL) {
  85                 // identity equality check
  86                 for (int i = 0, e = listeners->size(); i < e; ++i) {
  87                     const EventListener* el = (const EventListener*)listeners->elementAt(i);
  88                     if (l == el) {
  89                         listeners->removeElementAt(i);
  90                         if (listeners->size() == 0) {
  91                             delete listeners;
  92                             listeners = NULL;
  93                         }
  94                         return;
  95                     }
  96                 }
  97             }
  98         }
  99     }
 100 }
 101
 102 void
 103 ICUNotifier::notifyChanged(void)
 104 {
 105     if (listeners != NULL) {
 106         Mutex lmx(&notifyLock);
 107         if (listeners != NULL) {
 108             for (int i = 0, e = listeners->size(); i < e; ++i) {
 109                 EventListener* el = (EventListener*)listeners->elementAt(i);
 110                 notifyListener(*el);
 111             }
 112         }
 113     }
 114 }
 115
 116 U_NAMESPACE_END
 117
 118 /* UCONFIG_NO_SERVICE */
 119 #endif
 120