RE: Re: Re: restlet-gwt serialization performance
Well, in fact the problem was ... the development mode of GWT. As I could not understand the problem, I tried to deploy the web app on tomcat and then the performances were almost the same for json and gwt serialization... Strange ... But the performance remains surprising : in speed tracer I compared the performance of the json and GWT, and surprisingly the GWT request is bigger (I expected it would be smaller since there is less data to transmit) but it is faster (?) Mime-type application/json Total Bytes 6924 bytes Request Timing @1009ms for 33ms Response Timing @1042ms for 11ms Total Timing@1009ms for 44ms Mime-type application/x-java-serialized-object+gwt Total Bytes 13491 bytes Request Timing @6297ms for 17ms Response Timing @6314ms for 17ms Total Timing@6297ms for 34ms Bigger ? but still faster ? where is the logic ? I must be missing something ... Ben -- http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447dsMessageId=2701542
RE: Re: restlet-gwt serialization performance
Hello, thank's for the quick answer ! I tried with IE, FF and Chrome. The result is the same. I profiled the client with the Chrome plugin Speed Tracer : I thought there was no ambiguity. But I had a doubt because chrome is working strangely on my pc. I then created a simple restlet client in order to test : ClientResource resource = new ClientResource(http://127.0.0.1:/restlet/operations/byAccDate/start01102010/end10102010;); resource.get(MediaType.APPLICATION_JAVA_OBJECT_GWT).write(System.out); There is no doubt : if i don't de-serialize, the performance is very good... The pb is on the client side... my first tests will be : 1/ desactivate every graphical update on the client side : done, no significant result (13s) 2/ de-serialize the json string result in gwt 3/ try the Google Chrome Frame you mentionned 4/ ? any suggestion ? Is there a way to improve the de-serialization with GWT ? Should I modify my objects ? Should I store the data corresponding to the Operations in tables / array (not very familiar with javascript...) Thank's ! Ben -- http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447dsMessageId=2699374
restlet-gwt serialization performance
Hello,
I encounter problem of performance in the serialization of an object by
restlet-gwt : the json version takes 24ms whereas the gwt version takes 18s ...
ON THE CLIENT SIDE :
// JSON Button :
requestButton.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
ClientResource r = new
ClientResource(/restlet/operations/byAccDate/start01102010/end10102010);
r.setOnResponse(new Uniform() {
public void handle(Request request, Response response) {
try {
respAreaLabel.setText(response.getEntity().getText());
} catch (IOException e) {
e.printStackTrace();
}
}
});
r.get(MediaType.APPLICATION_JSON);
}
});
// GWT Button :
btReqAllOpe.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
OperationsProxy orp = GWT.create(OperationsProxy.class);
orp.getClientResource().setReference(/restlet/operations/byAccDate/start01102010/end10102010);
orp.getClientResource().getClientInfo().getAcceptedMediaTypes().add(new
PreferenceMediaType(MediaType.APPLICATION_JAVA_OBJECT_GWT));
orp.retrieve(new Result Operations () {
public void onFailure(Throwable caught) {
String st = error: + caught.getMessage();
respAreaLabel.setText(st);
}
@Override
public void onSuccess(Operations opeList) {
for (Operation ope : opeList) {
addRowOpe(ft , ope);
}
}
});
}
});
ON THE SERVER SIDE :
public class CopyOfOperationsServerRessource extends ServerResource
implements OperationsServerRessource_Int {
private OperationDaoInterface opeDao;
public void setOpeDao(OperationDaoInterface opeDao) {
this.opeDao = opeDao;
}
public OperationDaoInterface getOpeDao() {
return opeDao;
}
@Get
public Operations retrieve() {
ArrayListOperation result = new Operations(opeDao.getAll()) ;
return new Operations(result) ;
}
@Get(json)
public JsonRepresentation retrieveJson() {
ArrayListOperation result = new Operations(opeDao.getAll()) ;
XStream xstream = new XStream(new JsonHierarchicalStreamDriver());
xstream.setMode(XStream.NO_REFERENCES);
xstream.alias(operation, Operation.class);
return new JsonRepresentation( xstream.toXML(result) );
}
}
public interface OperationsProxy extends ClientProxy {
@Get
public void retrieve(ResultOperations callback);
}
I thought I correctly use the gwt plugin, but the performance gap with the json
version seems just too huge : I must have missed something : any idea ?
regards !
Ben
--
http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447dsMessageId=2699162
RE: GWT demo project with R2.0.0
well, I made the test, with both the snapshot and the 2.0 stable release. I always have the same behaviour as with the project dowloaded and run without any modification... I think this is a problem with the tutorial, but i should not be the only one with this pb (the warnings are the same on my different computers...). any idea ? regards, Ben -- http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447dsMessageId=2649866
RE: GWT demo project with R2.0.0
Hello, Point 1 solved : I think I made a mistake : now my tests work with the jar of the lastest release. The bug was between the chair and the keyboard ! :-) Good. Point 2 : the given demo in the wiki continues to send warnings even if everything seems to work... If some one can correct it (but seems minor). see you, Ben -- http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447dsMessageId=2645355
how to send an array of json objects to a GWT client ?
Hello,
I need to send an ordered lit of objects to a GWT client.
Here is the solution I found, it works, but I am prety sure that tere is a more
efficient solution :
My code on the server side :
public class TestArrayOfjObjectRessource extends ServerResource {
@Get(json)
public Representation toJson() throws ResourceException {
ListObject list = new ArrayListObject();
MyClass myObject_1 = new MyClass;
MyClass myObject_2 = new MyClass;
list.add( new JsonRepresentation(myObject_1).getJsonObject());
list.add( new JsonRepresentation(myObject_2).getJsonObject());
JsonRepresentation jr = new JsonRepresentation(new
JSONArray(list));
return jr;
}
}
On client side :
jsonButton.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
ClientResource r = new
ClientResource(/restlet/simpleTestRessource);
r.setOnResponse(new Uniform() {
public void handle(Request request, Response
response) {
Representation myEntity = response.getEntity();
JsonRepresentation jRep = new
JsonRepresentation(myEntity);
try {
JSONObject jsonObject =
jRep.getValue().isObject();
respAreaLabel.setText(jsonObject.toString());
} catch (IOException e) {
e.printStackTrace();
}
}
});
// Indicates the client preferences and let the server handle
// the best representation with content negotiation.
r.get(MediaType.APPLICATION_JSON);
}
});
== the displayed result is [{...},{...}] what is the expected result.
does anyone have an idea if my solution can be improved.
thanks !
--
http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447dsMessageId=2645216
GWT demo project with R2.0.0
Hello,
I continue my investigations of Restlet : it sounds very promising but I
encounter few problems with the demo project of the GWT edition :
http://wiki.restlet.org/docs_2.0/13-restlet/275-restlet/144-restlet/188-restlet.html
It is not possible to propose this framework in a professional project if we do
not manage to put on the demo, i really hope that someone has a suggestion.
Here are the 2 points :
1/ if you replace the R2.0rc3 Restlet server jar located in war/WEB-INF/lib
with R2.0.0 ones, then the json test no longer works (and work again if the jar
are downgraded to 2.0rc3)
The warning are at the end of the post [1]
2/ when running the application (with R2.0rc3 jar), everything works fine,
nonetheless there is a warning about the WAR connector : ATTENTION: No
available client connector supports the required protocols: 'WAR' .
Complete warning further [2]
Any idea ?
Incompatibility between the demo project (testGwtRestlet-2.0) and R2.0.0 ?
Thank you, my analyse is stuck by sand dust and this is quite frustrating since
I have great expectation for this framework.
Ben
WARNINGS :
[1]
14:03:08.218 [ERROR] [testgwtrestlet_2_0] Uncaught exception escaped
com.google.gwt.json.client.JSONException:
com.google.gwt.core.client.JavaScriptException: (SyntaxError): invalid regular
expression flag a
fileName:
http://127.0.0.1:1212/testgwtrestlet_2_0/hosted.html?testgwtrestlet_2_0
lineNumber: 54
stack: eval((?xml version=\1.0\
encoding=\UTF-8\?mainkey2value2/key2key1value1/key1/main))@:0
((?xml version=\1.0\
encoding=\UTF-8\?mainkey2value2/key2key1value1/key1/main))@http://127.0.0.1:1212/testgwtrestlet_2_0/hosted.html?testgwtrestlet_2_0:54
(?xml version=\1.0\
encoding=\UTF-8\?mainkey2value2/key2key1value1/key1/main)@http://127.0.0.1:1212:27
@:0
([object GWTJavaObject],786433,[object
XMLHttpRequest])@http://127.0.0.1:1212/testgwtrestlet_2_0/hosted.html?testgwtrestlet_2_0:56
([object Event])@http://127.0.0.1:1212:80
((function () {__gwt_makeJavaInvoke(1)(handler, 786433, _this);}),[object
XMLHttpRequest],[object Object])@http://127.0.0.1:1212:60
@:0
(null,65560,(function () {__gwt_makeJavaInvoke(1)(handler, 786433,
_this);}),[object XMLHttpRequest],[object
Object])@http://127.0.0.1:1212/testgwtrestlet_2_0/hosted.html?testgwtrestlet_2_0:56
([object Event])@http://127.0.0.1:1212:48
at com.google.gwt.json.client.JSONParser.parse(JSONParser.java:53)
at
org.restlet.client.ext.json.JsonRepresentation.getValue(JsonRepresentation.java:160)
at
org.restlet.example.gwt.client.SimpleExample$3$1.handle(SimpleExample.java:170)
at
org.restlet.client.engine.http.adapter.ClientAdapter$1.handle(ClientAdapter.java:102)
at
org.restlet.client.engine.http.GwtClientCall$2.onResponseReceived(GwtClientCall.java:245)
at
com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
at
com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:393)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at
com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:157)
at
com.google.gwt.dev.shell.BrowserChannel.reactToMessagesWhileWaitingForReturn(BrowserChannel.java:1714)
at
com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:165)
at
com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:120)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:507)
at
com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:264)
at
com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:188)
at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at
com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:157)
at
com.google.gwt.dev.shell.BrowserChannel.reactToMessages(BrowserChannel.java:1669)
at
com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:401)
at
com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:222)
at java.lang.Thread.run(Unknown Source)
Caused by: com.google.gwt.core.client.JavaScriptException:
Restlet 2.0 gwt : where are server class packages ?
Hello, My first steps with restlet gwt 2.0 were very promising. The exemple project works fine. Then I tried to set up my own project : I put on the class path the 3 jar given with the gwt edition 2.0.0 : - org.restlet.jar - org.restlet.ext.json.jar - org.restlet.ext.xml.jar But none of these jar contains server side classes such as - org.restlet.Application or - org.restlet.ressource.ServerRessource == where should i find these classes ? I can't use org.restlet.jar from another edition otherwise gwt classes will be missing ... many thanks, ben -- http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447dsMessageId=2643228
RE: Restlet 2.0 gwt : where are server class packages ?
Ok thank you, with your informations and by digging the documentation, I understood : 1/ The 3 jar given with the gwt edition 2.0.0 (client side) : - org.restlet.jar - org.restlet.ext.json.jar - org.restlet.ext.xml.jar must be in the class path of the project (file can be where ever we want, just add it to the class path). 2/ The jar given with the edition corresponding to the server side used (jee in my case), must be placed in : war/WEB-INF/lib and then added to the classpath. When reading the doc it is not said clearly, i hope this post will help other people with the same misunderstanding. anyway, it work's well, thank you for your help ! -- http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447dsMessageId=2643907
