gecko/xpcom/tests/TestObserverService.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2012-05-21 04:12:37 -07:00
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsISupports.h"
#include "nsIComponentManager.h"
#include "nsIObserverService.h"
#include "nsIObserver.h"
#include "nsISimpleEnumerator.h"
#include "nsStringGlue.h"
#include "nsWeakReference.h"
#include "nsComponentManagerUtils.h"
#include "mozilla/Attributes.h"
#include <stdio.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) {
printf("%s", NS_ConvertUTF16toUTF8(str).get());
}
class TestObserver MOZ_FINAL : 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(reinterpret_cast<TestObserver*>(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(), false);
testResult(rv);
printf("Adding Observer-B as observer of topic-A...\n");
rv = anObserverService->AddObserver(bObserver, topicA.get(), false);
testResult(rv);
printf("Adding Observer-B as observer of topic-B...\n");
rv = anObserverService->AddObserver(bObserver, topicB.get(), 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;
bool loop = true;
while( NS_SUCCEEDED(e->HasMoreElements(&loop)) && loop)
{
e->GetNext(getter_AddRefs(observer));
printf("Calling observe on enumerated observer ");
printString(reinterpret_cast<TestObserver*>
(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 0;
}