RetroZilla/xpcom/tests/TestObserverService.cpp

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2015-10-21 05:03:22 +02:00
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsISupports.h"
#include "nsIComponentManager.h"
#include "nsIObserverService.h"
#include "nsIObserver.h"
#include "nsIEnumerator.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "prprf.h"
#include "nsWeakReference.h"
static nsIObserverService *anObserverService = NULL;
static void testResult( nsresult rv ) {
if ( NS_SUCCEEDED( rv ) ) {
printf("...ok\n");
} else {
printf("...failed, rv=0x%x\n", (int)rv);
}
return;
}
void printString(nsString &str) {
const char *cstr = ToNewCString(str);
printf("%s", cstr);
delete [] (char*)cstr;
}
class TestObserver : public nsIObserver, public nsSupportsWeakReference {
public:
TestObserver( const nsAString &name )
: mName( name ) {
}
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
nsString mName;
private:
~TestObserver() {}
};
NS_IMPL_ISUPPORTS2( TestObserver, nsIObserver, nsISupportsWeakReference )
NS_IMETHODIMP
TestObserver::Observe( nsISupports *aSubject,
const char *aTopic,
const PRUnichar *someData ) {
nsCString topic( aTopic );
nsString data( someData );
/*
The annoying double-cast below is to work around an annoying bug in
the compiler currently used on wensleydale. This is a test.
*/
printString(mName);
printf(" has observed something: subject@%p", (void*)aSubject);
printf(" name=");
printString(NS_REINTERPRET_CAST(TestObserver*, NS_REINTERPRET_CAST(void*, aSubject))->mName);
printf(" aTopic=%s", topic.get());
printf(" someData=");
printString(data);
printf("\n");
return NS_OK;
}
int main(int argc, char *argv[])
{
nsCString topicA; topicA.Assign( "topic-A" );
nsCString topicB; topicB.Assign( "topic-B" );
nsresult rv;
nsresult res = CallCreateInstance("@mozilla.org/observer-service;1", &anObserverService);
if (res == NS_OK) {
nsIObserver *aObserver = new TestObserver(NS_LITERAL_STRING("Observer-A"));
aObserver->AddRef();
nsIObserver *bObserver = new TestObserver(NS_LITERAL_STRING("Observer-B"));
bObserver->AddRef();
printf("Adding Observer-A as observer of topic-A...\n");
rv = anObserverService->AddObserver(aObserver, topicA.get(), PR_FALSE);
testResult(rv);
printf("Adding Observer-B as observer of topic-A...\n");
rv = anObserverService->AddObserver(bObserver, topicA.get(), PR_FALSE);
testResult(rv);
printf("Adding Observer-B as observer of topic-B...\n");
rv = anObserverService->AddObserver(bObserver, topicB.get(), PR_FALSE);
testResult(rv);
printf("Testing Notify(observer-A, topic-A)...\n");
rv = anObserverService->NotifyObservers( aObserver,
topicA.get(),
NS_LITERAL_STRING("Testing Notify(observer-A, topic-A)").get() );
testResult(rv);
printf("Testing Notify(observer-B, topic-B)...\n");
rv = anObserverService->NotifyObservers( bObserver,
topicB.get(),
NS_LITERAL_STRING("Testing Notify(observer-B, topic-B)").get() );
testResult(rv);
printf("Testing EnumerateObserverList (for topic-A)...\n");
nsCOMPtr<nsISimpleEnumerator> e;
rv = anObserverService->EnumerateObservers(topicA.get(), getter_AddRefs(e));
testResult(rv);
printf("Enumerating observers of topic-A...\n");
if ( e ) {
nsCOMPtr<nsIObserver> observer;
PRBool loop = PR_TRUE;
while( NS_SUCCEEDED(e->HasMoreElements(&loop)) && loop)
{
e->GetNext(getter_AddRefs(observer));
printf("Calling observe on enumerated observer ");
printString(NS_REINTERPRET_CAST(TestObserver*,
NS_REINTERPRET_CAST(void*, observer.get()))->mName);
printf("...\n");
rv = observer->Observe( observer,
topicA.get(),
NS_LITERAL_STRING("during enumeration").get() );
testResult(rv);
}
}
printf("...done enumerating observers of topic-A\n");
printf("Removing Observer-A...\n");
rv = anObserverService->RemoveObserver(aObserver, topicA.get());
testResult(rv);
printf("Removing Observer-B (topic-A)...\n");
rv = anObserverService->RemoveObserver(bObserver, topicB.get());
testResult(rv);
printf("Removing Observer-B (topic-B)...\n");
rv = anObserverService->RemoveObserver(bObserver, topicA.get());
testResult(rv);
}
return NS_OK;
}