I've stuck everything on github; git://github.com/manstis/gwt-plugins.git
plugin - the "plugin"
pluginserver - the "framework"
plugincommon contains my common model
There's only about 10 files in all; so it's not so ominous.
I thought this would be easier than trying to explain directly - I'm
not expecting you to fix anything, it's just so you can see what I
have and give some suggestions.
As it stands, I can pass the "common" model class to the "framework",
but all attributes are undefined:
http://stackoverflow.com/questions/6535303/gwt-gwt-exporter-passing-objects
If you decided to try and run it; plugin and pluginserver WARs can be
deployed to Tomcat (I use 6.0) and select the URL for the server
portion.
Cheers,
Mike
On Jul 3, 10:14 am, lemaiol <lema...@gmail.com> wrote:
> Hi Mike,
>
> How are the modules loaded and how are they invoked?
>
> Berto
>
> On Jun 22, 2:10 pm, manstis <michael.ans...@gmail.com> wrote:> Great, lots to play with :)
>
> > Before I look into writing my own JSNI bridge, I've still been trying
> > to use gwt-exporter, but.....
>
> > I've three GWT applications:-
> > (1) Plugin (inherits "Common")
> > (2) Backend (inherits "Common")
> > (3) Common
>
> > "Plugin"
> > --------
> > Contains:-
>
> > ...
> > echoButton.addClickHandler(new ClickHandler() {
>
> > public void onClick(ClickEvent event) {
> > //Debugging statements shown --> shows 'callback' is not null
> > PluginCallback<String> callback = getPluginCallback();
> > Window.alert("Plugin.onModuleLoad.onClick.callback is " +
> > (callback != null ? "not " : "") + "null");
>
> > echo(text.getText(), callback);
> > }
>
> > });
> > ...
>
> > private native void echo(String text, PluginCallback<String>
> > callback) /*-{
> > //Debugging statements shown --> shows 'callback' is not null
> > alert("Plugin.echo.callback is " + (callback != null ? "not " :
> > "") + "null");
>
> > $wnd.com.anstis.pluginserver.CommonService.echo(text, callback);
> > }-*/;
>
> > "Backend"
> > --------
> > Contains:-
>
> > public void onModuleLoad() {
> > //Use gwt-exporter to generate the JSNI for CommonService.class
> > GWT.create(CommonService.class);
> > }
>
> > CommonService is:-
>
> > @Export
> > public class CommonService implements Exportable {
>
> > private static final EchoServiceAsync echoService =
> > GWT.create(EchoService.class);
>
> > public static void echo(String input, PluginCallback<String>
> > callback) {
> > //Debugging statements shown --> shows 'callback' is null
> > Window.alert("CommonService.echo.callback is " + (callback !=
> > null ? "not " : "") + "null");
> > try {
>
> > //The guts of the method, invoke a GWT-RPC call --> RTE, as
> > 'callback' is null
> > echoService.echo(input, callback);
>
> > } catch (Exception e) {
> > e.fillInStackTrace();
> > e.printStackTrace(System.out);
> > Window.alert(e.getMessage());
> > }
> > }
>
> > }
>
> > "Common"
> > --------
> > Simply defines PluginCallback, as follows:-
>
> > public class PluginCallback<T> implements AsyncCallback<T> {
> > public void onFailure(Throwable caught) {}
> > public void onSuccess(T result) {}
> > }
>
> > My problem is that the PluginCallback instance is proven to be non-
> > null in "Plugin" (both Java and JSNI methods), but is reported as null
> > in "Backends" CommonService.
>
> > Somewhere it is getting munged, but I only pass a Java Object from
> > "Plugin" to JSNI (echo) to Java (CommonService) so don't understand
> > why it's being nulled?!?!
>
> > Any ideas (I'll post as a new question if you don't see anything
> > wrong, so it gets seen by a new audience as opposed to those just
> > following this thread).
>
> > Thanks,
>
> > Mike
>
> > On Jun 21, 7:32 pm,lemaiol<lema...@gmail.com> wrote:
>
> > > Hi Mike,
>
> > > > I am growing to believe I need to deploy each plug-in as a separate
> > > > WAR on a web-server. Is this true, or have I missed something?
>
> > > In the case of my architecture, it is even a requirement that every
> > > plugin will be deployed as an own WAR file. It allows different teams
> > > working in parallel in completely independent applications (plugins)
> > > which have a common "message data model". When inside the plugins
> > > container, they receive messages with this "common data model". When
> > > out of the plugins container, the show a simplified UI to let the
> > > developer pass a "message" generated by hand and therefore test the
> > > application.
>
> > > > I am also using gwt-exporter to make the JSNI messaging mechanism;
> > > > i.e. I just write an "Exportable" class and use the resulting JS API
> > > > from my plugins. I am hoping to use gwt-api-interop to remove the need
> > > > to use the JS API.
>
> > > I have seen gwt-exporter but do not know gwt-api-interop.
>
> > > > I assume the JS "bridge" between GWT applications handles the
> > > > messaging between them (i.e. plugins register callbacks to handle
> > > > messages sent from the "host"?)
>
> > > Yes.
>
> > > > If I understand correctly, adding additional script tags to my
> > > > "loader" page and having each plug-in as a separate WAR I avoid the
> > > > need to inherit in my gwt.xml file?
>
> > > My common model and plugin base classes live in a common GWT module
> > > that each plugin inherits.
>
> > > > An example of your use of JavaScriptObject in your messaging sub-
> > > > system would be interesting....
>
> > > // Application specific common model
> > > public final class CustomerInfo extends ModuleInfo {
> > > protected CustomerInfo() {
> > > }
>
> > > public native String getId() /*-{
> > > return this.id;
> > > }-*/;
>
> > > public native void setId(String id) /*-{
> > > this.id = id;
> > > }-*/;
>
> > > }
>
> > > // Base class for common models - no functionality as of now
> > > public class ModuleInfo extends JavaScriptObject {
> > > protected ModuleInfo() {
> > > }
>
> > > }
>
> > > // To be implemented by every module
> > > public interface IModule<T extends ModuleInfo> {
> > > public String getName();
> > > public void dispatch(String containerId, T moduleInfo);
>
> > > }
>
> > > // To be implemented by the main module or classes interested in
> > > module lifecycle events
> > > public interface IModuleAware<T extends ModuleInfo> {
> > > public void onModuleAttached(Module<T> module);
>
> > > }
>
> > > // Durable callback implementation - Because it uses JSNI, can be
> > > inherited from GWT modules but it is interoperable. Avoids using gwt-
> > > exporter
> > > public final class ModuleListener<T extends ModuleInfo> extends
> > > JavaScriptObject {
> > > protected ModuleListener() {
> > > }
>
> > > public void onModuleAttached(Module<T> module) {
> > > invokeCallback(getCallback(), module);
> > > }
>
> > > private native void invokeCallback(JavaScriptObject callback,
> > > Module<T> module) /*-{
> > > this.callback(module);
> > > }-*/;
>
> > > private native JavaScriptObject getCallback() /*-{
> > > return this.callback;
> > > }-*/;
>
> > > public native void setCallback(JavaScriptObject callback) /*-{
> > > this.callback = callback;
> > > }-*/;
>
> > > }
>
> > > // Support for common modules functionality (static methods)
> > > public abstract class ModulesSupport {
> > > public static <T extends ModuleInfo> boolean
> > > registerAsListener(IModuleAware<T> instance) {
> > > ModulesConfig<T> modulesConfig = getModulesConfig();
> > > boolean result = null != modulesConfig;
> > > if (result) {
> > > modulesConfig.registerListener(createListener(instance));
> > > }
> > > return result;
> > > }
>
> > > public static <T extends ModuleInfo> boolean
> > > registerAsModule(IModule<T> module) {
> > > ModulesConfig modulesConfig = ModulesConfig.get();
> > > boolean result = null != modulesConfig;
> > > if (result) {
> > > modulesConfig.attach(module.getName(),
> > > createDispatchCallback(module));
> > > }
> > > return result;
> > > }
>
> > > public static <T extends ModuleInfo> ModulesConfig<T>
> > > getModulesConfig() {
> > > return ModulesConfig.get();
> > > }
>
> > > private static <T extends ModuleInfo> ModuleListener<T>
> > > createListener(IModuleAware<T> instance) {
> > > ModuleListener<T> result =
> > > JavaScriptObject.createObject().cast();
> > > result.setCallback(createListenerCallback(instance));
> > > return result;
> > > }
>
> > > private static native JavaScriptObject
> > > createListenerCallback(IModuleAware instance) /*-{
> > > return function(module) {
>
> > > instan...@org.myexample.modules.client.IModuleAware::onModuleAttached(Lorg/
> > > myexample/modules/client/Module;)(module);
> > > };
> > > }-*/;
>
> > > private static native JavaScriptObject
> > > createDispatchCallback(IModule instance) /*-{
> > > return function(containerId, moduleInfo) {
>
> > > instan...@org.myexample.modules.client.IModule::dispatch(Ljava/lang/
> > > String;Lorg/myexample/modules/client/ModuleInfo;)(containerId,
> > > moduleInfo);
> > > };
> > > }-*/;
>
> > > }
>
> > > Hope it helps,
> > > Berto
>
>
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