michael@0: function getCacheService()
michael@0: {
michael@0:     var nsCacheService = Components.classes["@mozilla.org/network/cache-service;1"];
michael@0:     var service = nsCacheService.getService(Components.interfaces.nsICacheService);
michael@0:     return service;
michael@0: }
michael@0: 
michael@0: function createCacheSession(clientID, storagePolicy, streamable)
michael@0: {
michael@0:     var service = getCacheService();
michael@0:     var nsICache = Components.interfaces.nsICache;
michael@0:     var session = service.createSession(clientID, storagePolicy, streamable);
michael@0:     return session;
michael@0: }
michael@0: 
michael@0: function openCacheEntry(clientID, url)
michael@0: {
michael@0:     var nsICache = Components.interfaces.nsICache;
michael@0:     var session = createCacheSession(clientID, nsICache.STORE_ANYWHERE, false);
michael@0:     var entry = session.openCacheEntry(url, nsICache.ACCESS_READ_WRITE);
michael@0:     return entry;
michael@0: }
michael@0: 
michael@0: function wrapString(str)
michael@0: {
michael@0:     var nsISupportsCString = Components.interfaces.nsISupportsCString;
michael@0:     var factory = Components.classes["@mozilla.org/supports-cstring;1"];
michael@0:     var wrapper = factory.createInstance(nsISupportsCString);
michael@0:     wrapper.data = str;
michael@0:     return wrapper;
michael@0: }
michael@0: 
michael@0: function test()
michael@0: {
michael@0:     var data = wrapString("javascript");
michael@0:     var entry = openCacheEntry("javascript", "theme:button");
michael@0:     entry.cacheElement = data;
michael@0:     entry.markValid();
michael@0:     entry.close();
michael@0: 
michael@0:     var newEntry = openCacheEntry("javascript", "theme:button");
michael@0:     if (newEntry.cacheElement === data)
michael@0:         print("object cache works.");
michael@0:     else
michael@0:         print("object cache failed.");
michael@0: }
michael@0: 
michael@0: test();