153 lines
5.1 KiB
C++
153 lines
5.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsISupports.h"
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#include "nsIComponentManager.h"
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#include "nsIObserverService.h"
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#include "nsIObserver.h"
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#include "nsISimpleEnumerator.h"
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#include "nsStringGlue.h"
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#include "nsWeakReference.h"
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#include "nsComponentManagerUtils.h"
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#include "mozilla/Attributes.h"
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#include <stdio.h>
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static nsIObserverService *anObserverService = nullptr;
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static void testResult( nsresult rv ) {
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if ( NS_SUCCEEDED( rv ) ) {
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printf("...ok\n");
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} else {
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printf("...failed, rv=0x%x\n", (int)rv);
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}
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return;
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}
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void printString(nsString &str) {
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printf("%s", NS_ConvertUTF16toUTF8(str).get());
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}
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class TestObserver final : public nsIObserver,
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public nsSupportsWeakReference
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{
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public:
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explicit TestObserver( const nsAString &name )
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: mName( name ) {
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}
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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nsString mName;
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private:
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~TestObserver() {}
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};
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NS_IMPL_ISUPPORTS( TestObserver, nsIObserver, nsISupportsWeakReference )
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NS_IMETHODIMP
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TestObserver::Observe( nsISupports *aSubject,
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const char *aTopic,
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const char16_t *someData ) {
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nsCString topic( aTopic );
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nsString data( someData );
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/*
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The annoying double-cast below is to work around an annoying bug in
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the compiler currently used on wensleydale. This is a test.
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*/
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printString(mName);
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printf(" has observed something: subject@%p", (void*)aSubject);
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printf(" name=");
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printString(reinterpret_cast<TestObserver*>(reinterpret_cast<void*>(aSubject))->mName);
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printf(" aTopic=%s", topic.get());
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printf(" someData=");
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printString(data);
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printf("\n");
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return NS_OK;
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}
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int main(int argc, char *argv[])
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{
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nsCString topicA; topicA.Assign( "topic-A" );
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nsCString topicB; topicB.Assign( "topic-B" );
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nsresult rv;
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nsresult res = CallCreateInstance("@mozilla.org/observer-service;1", &anObserverService);
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if (res == NS_OK) {
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nsIObserver *aObserver = new TestObserver(NS_LITERAL_STRING("Observer-A"));
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aObserver->AddRef();
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nsIObserver *bObserver = new TestObserver(NS_LITERAL_STRING("Observer-B"));
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bObserver->AddRef();
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printf("Adding Observer-A as observer of topic-A...\n");
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rv = anObserverService->AddObserver(aObserver, topicA.get(), false);
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testResult(rv);
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printf("Adding Observer-B as observer of topic-A...\n");
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rv = anObserverService->AddObserver(bObserver, topicA.get(), false);
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testResult(rv);
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printf("Adding Observer-B as observer of topic-B...\n");
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rv = anObserverService->AddObserver(bObserver, topicB.get(), false);
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testResult(rv);
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printf("Testing Notify(observer-A, topic-A)...\n");
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rv = anObserverService->NotifyObservers( aObserver,
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topicA.get(),
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MOZ_UTF16("Testing Notify(observer-A, topic-A)") );
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testResult(rv);
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printf("Testing Notify(observer-B, topic-B)...\n");
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rv = anObserverService->NotifyObservers( bObserver,
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topicB.get(),
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MOZ_UTF16("Testing Notify(observer-B, topic-B)") );
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testResult(rv);
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printf("Testing EnumerateObserverList (for topic-A)...\n");
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nsCOMPtr<nsISimpleEnumerator> e;
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rv = anObserverService->EnumerateObservers(topicA.get(), getter_AddRefs(e));
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testResult(rv);
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printf("Enumerating observers of topic-A...\n");
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if ( e ) {
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nsCOMPtr<nsIObserver> observer;
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bool loop = true;
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while( NS_SUCCEEDED(e->HasMoreElements(&loop)) && loop)
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{
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nsCOMPtr<nsISupports> supports;
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e->GetNext(getter_AddRefs(supports));
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observer = do_QueryInterface(supports);
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printf("Calling observe on enumerated observer ");
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printString(reinterpret_cast<TestObserver*>
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(reinterpret_cast<void*>(observer.get()))->mName);
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printf("...\n");
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rv = observer->Observe( observer,
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topicA.get(),
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MOZ_UTF16("during enumeration") );
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testResult(rv);
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}
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}
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printf("...done enumerating observers of topic-A\n");
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printf("Removing Observer-A...\n");
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rv = anObserverService->RemoveObserver(aObserver, topicA.get());
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testResult(rv);
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printf("Removing Observer-B (topic-A)...\n");
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rv = anObserverService->RemoveObserver(bObserver, topicB.get());
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testResult(rv);
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printf("Removing Observer-B (topic-B)...\n");
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rv = anObserverService->RemoveObserver(bObserver, topicA.get());
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testResult(rv);
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}
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return 0;
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}
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