I have the client side working, looks like everything is alright. I can save the object and retrieve the object back from the client side.
However, if i am trying to use gfsh or data browser to view the data, i got this exception on gfsh
Message : Could not create an instance of a class com.room.backend.soa.spring.cache.geode.test.domain.Book
Result : false
and on data browser
javalangException- Query could not be executed due to - orgapachegeodepdxPdxSerializationException- Could not create an instance of a class comroombackendsoaspringcachegeodetestdomainBook
My code is like this
ClientCacheFactoryBean gemfireCache = new ClientCacheFactoryBean();
gemfireCache.setClose(true);
gemfireCache.setProperties(gemfireProperties);
gemfireCache.setPdxSerializer(pdxSerializer);
pdxSerializer is
ReflectionBasedAutoSerializer serializer =
new ReflectionBasedAutoSerializer(
"com.room.backend.soa.spring.cache.geode.test.domain.*",
"com.room.backend.soa.spring.cache.geode.test.domain.Book",
"com.room.backend.soa.spring.cache.geode.test.domain.Book#identity=id.*",
"com.room.backend.soa.spring.cache.geode.test.domain.#identity=id.*"
);
You need to run the gfsh>configure pdx --read-serialized=true command. This should be done after starting the locator, but before starting the servers. Please refer to this docs page for details.
Related
My application, an API server, is thought to be organized as follows:
MainVerticle is called on startup and should create all necessary objects for the application to work. Mainly a mongoDB pool of connections (MongoClient.createShared(...)) and a global configuration object available instance-wide. It also starts the HTTP Listener, several instances of a HttpVerticle.
HttpVerticle is in charge of receiving requests and, based the command xxx in the payload, execute the XxxHandler.handle(...) method.
Most of the XxxHandler.handle(...) methods will need to access the database. In addition, some others will also deploy additional verticles with parameters from the global conf. For example LoginHandler.handle(...) will deploy a verticle to keep user state while he's connected and this verticle will be undeployed when the user logs out.
I can't figure out how to get the global configuration object while being in XxxHandler.handle(...) or in a "sub"-verticle. Same for the mongo client.
Q1: For configuration data, I tried to use SharedData. In `MainVerticle.start() I have:
LocalMap<String, String> lm = vertx.sharedData().getLocalMap("conf");
lm.put("var", "val");
and in `HttpVerticle.start() I have:
LocalMap<String, String> lm = vertx.sharedData().getLocalMap("conf");
log.debug("var={}", lm.get("var"));
but the log output is var=null.... What am I doing wrong ?
Q2: Besides this basic example with a <String, String> map type, what if the value is a mutable Object like JsonObject which actually is what I would need ?
Q3: Finally how to make the instance of the mongo client available to all verticles?
Instead of getLocalMap() you should be using getClusterWideMap(). Then you should be able to operate on shared data accross the whole cluster and not just in one verticle.
Be aware that the shared operations are async and the code might look like (code in Groovy):
vertx.sharedData().getClusterWideMap( 'your-name' ){ AsyncResult<AsyncMap<String,String>> res ->
if( res.succeeded() )
res.result().put( 'var', 'val', { log.info "put succeeded: ${it.succeeded()}" } )
}
You should be able to use any Serializable objects in your map.
I have a ServiceWorker registered on my page and want to pass some data to it so it can be stored in an IndexedDB and used later for network requests (it's an access token).
Is the correct thing just to use network requests and catch them on the SW side using fetch, or is there something more clever?
Note for future readers wondering similar things to me:
Setting properties on the SW registration object, e.g. setting self.registration.foo to a function within the service worker and doing the following in the page:
navigator.serviceWorker.getRegistration().then(function(reg) { reg.foo; })
Results in TypeError: reg.foo is not a function. I presume this is something to do with the lifecycle of a ServiceWorker meaning you can't modify it and expect those modification to be accessible in the future, so any interface with a SW likely has to be postMessage style, so perhaps just using fetch is the best way to go...?
So it turns out that you can't actually call a method within a SW from your app (due to lifecycle issues), so you have to use a postMessage API to pass serialized JSON messages around (so no passing callbacks etc).
You can send a message to the controlling SW with the following app code:
navigator.serviceWorker.controller.postMessage({'hello': 'world'})
Combined with the following in the SW code:
self.addEventListener('message', function (evt) {
console.log('postMessage received', evt.data);
})
Which results in the following in my SW's console:
postMessage received Object {hello: "world"}
So by passing in a message (JS object) which indicates the function and arguments I want to call my event listener can receive it and call the right function in the SW. To return a result to the app code you will need to also pass a port of a MessageChannel in to the SW and then respond via postMessage, for example in the app you'd create and send over a MessageChannel with the data:
var messageChannel = new MessageChannel();
messageChannel.port1.onmessage = function(event) {
console.log(event.data);
};
// This sends the message data as well as transferring messageChannel.port2 to the service worker.
// The service worker can then use the transferred port to reply via postMessage(), which
// will in turn trigger the onmessage handler on messageChannel.port1.
// See https://html.spec.whatwg.org/multipage/workers.html#dom-worker-postmessage
navigator.serviceWorker.controller.postMessage(message, [messageChannel.port2]);
and then you can respond via it in your Service Worker within the message handler:
evt.ports[0].postMessage({'hello': 'world'});
To pass data to your service worker, the above mentioned is a good way. But in case, if someone is still having a hard time implementing that, there is an other hack around for that,
1 - append your data to get parameter while you load service-worker (for eg., from sw.js -> sw.js?a=x&b=y&c=z)
2- Now in service worker, fetch those data using self.self.location.search.
Note, this will be beneficial only if the data you pass do not change for a particular client very often, other wise it will keep changing the loading url of service worker for that particular client and every time the client reloads or revisits, new service worker is installed.
I have a jobque mechanism in ZF.
The jobque simlpy stores the the function call (Class, Method and params) and later executes it as CLI daemon. The daemon works, however at places the application looks for information from the request object, and when called from the CLI these places fail, or get no info.
I would like to store the original request object together with the job and when the job is processed set the request object back as if the job was done by the originall request, somethin along the line of the following pseudo code:
$ser_request = serialize(Zend_Controller_Front::getInstance ()->getRequest ());
-->save to db
-->retrive from db
$ZCF= new Zend_Controller_Front;
$ZCF::getInstance ()->setRequest (unserialize($ser_request))
The aim is to store and replay the jobs later withouth having to change the rest of the application.
Any suggestions how to do that?
I am not sure if this works, but here's an idea. Try to implement _sleep and _wakeup magic methods for the request object. Haven't tried it out, but maybe it's at least a starting solution.
I am new to lift. I have been working with MVC model so far and using basic session management model i.e. storing a token in the session and check on each request.
I am trying to do the same with lift, but my session getting expired abruptly. even some time I just logged in and it logged out. I have analysis that whenever I gets log message like this:
INFO - Session ucjrn5flnq9q1ke52z5zixgtt expired
I have searched but I couldn't find any step by step tutor
Sessions are managed by your servlet container. Which one are you using? You should look at the container's documentation.
Do not attempt to use S.get et al to access session bound information. This is just plain dangerous. Do it like this:
class Thing {
object SessionThing extends SessionVar[Box[String]](Empty)
...
def someMethod = {
...
SessionThing.is // returns you a Box[String].
// operates on the session variable if it exists,
// otherwise provides a sensible default
SessionThing.is.map(_.toLowerCase).openOr("default")
...
}
}
You need to understand the snippet and state lifecycles really, as it seems you're not fully understanding how lift's session mechanics work.
I found the solution of the problem. I was using embedded jetty server, where I was using ServletContextHandler to register lift filter. I changed it to WebAppContext and it started working fine.
Puneet
I have created Zend_Auth adapter implementing Zend_Auth_Adapter_Interface (similar to Pádraic's adapter) and created simple ACL plugin. Everything works fine with default session handler. So far, so good.
As a next step I have created custom Session SaveHandler to persist session data in the database. My implementation is very similar to this one from parables-demo. Seems that everything is working fine. Session data are properly saved to the database, session objects are serialized, but authentication does not work when I enable this custom SaveHandler.
I have debugged the authentication and all works fine up till the next request, when the authentication data are lost.
I suspected, that is has something to do with the fact, that I use $adapter->write($object) instead $adapter->write($string), but the same happens with strings.
I'm bootstrapping Zend_Application_Resource_Session in the first Bootstrap method, as early as possible.
Does Zend_Auth need any extra configuration to persist data in the database?
Why the authentity is being lost?
I have found the cause of the problems.
I used 'data' as a column name. Session SaveHandler from parables-demo was calling code similar to this:
$string = 'test'
$doctrineModel->data = $string;
echo gettype($doctrineModel->data); // displays 'Array', not string as some would expect
So the data I wanted to save were accidentally converted to arrays.