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GWT - RPC

GWT - RPC. RPC plumbing diagram. RPC plumbing diagram. package com.mycompany.client; import com.google.gwt.user.client.rpc.RemoteService; public interface MyAddService extends RemoteService { public int add(int a, int b); }. RPC plumbing diagram. package com.mycompany.server;

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GWT - RPC

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  1. GWT - RPC

  2. RPC plumbing diagram

  3. RPC plumbing diagram package com.mycompany.client; import com.google.gwt.user.client.rpc.RemoteService; public interface MyAddService extends RemoteService { public int add(int a, int b);}

  4. RPC plumbing diagram package com.mycompany.server; import com.google.gwt.user.server.rpc.RemoteServiceServlet;import com.mycompany.client.MyAddService; public class MyAddServiceImpl extends RemoteServiceServlet implements MyAddService{ public int add(int a, int b) { int z = a + b; return z; }}

  5. RPC plumbing diagram package com.mycompany.client; import com.google.gwt.user.client.rpc.AsyncCallback; public interface MyAddServiceAsync { public void add(int a, int b, AsyncCallback callback); }

  6. Deploy service • Tomcat -> add Servlet • Hosted mode -> modify module XML <module> <inherits name='com.google.gwt.user.User'/> <entry-point class='com.mycompany.client.MyApplication'/> <servlet path="/addService" class="com.mycompany.server.MyAddServiceImpl“/> </module>

  7. Actually making a call button.addClickListener( new ClickListener() { public void onClick(Widget sender) { AddServiceAsync addService = (AddServiceAsync) GWT.create(AddService.class); ServiceDefTarget endpoint = (ServiceDefTarget) addService; String moduleRelativeURL = GWT.getModuleBaseURL() + "myAddService“; endpoint.setServiceEntryPoint(moduleRelativeURL); instantiate service interface set service implementation url

  8. Actually making a call button.addClickListener( new ClickListener() { public void onClick(Widget sender) { AddServiceAsync addService = (AddServiceAsync) GWT.create(AddService.class); ServiceDefTarget endpoint = (ServiceDefTarget) addService; String moduleRelativeURL = GWT.getModuleBaseURL() + "myAddService“; endpoint.setServiceEntryPoint(moduleRelativeURL); AsyncCallback callback = new AsyncCallback(){ public void onSuccess(Object result){ resultaatLabel.setText(result.toString()); } public void onFailure(Throwable caught) { resultaatLabel.setText(caught.getMessage()); } create an asynchronous callback to handle the result

  9. Actually making a call button.addClickListener( new ClickListener() { public void onClick(Widget sender) { AddServiceAsync addService = (AddServiceAsync) GWT.create(AddService.class); ServiceDefTarget endpoint = (ServiceDefTarget) addService; String moduleRelativeURL = GWT.getModuleBaseURL() + "myAddService“; endpoint.setServiceEntryPoint(moduleRelativeURL); AsyncCallback callback = new AsyncCallback(){ public void onSuccess(Object result){ resultaatLabel.setText(result.toString()); } public void onFailure(Throwable caught) { resultaatLabel.setText(caught.getMessage()); } }; addService.add(Integer.parseInt(aBox.getText()), Integer.parseInt(bBox.getText()), callback); } } ); actually make the call

  10. Actually making a call button.addClickListener( new ClickListener() { public void onClick(Widget sender) { AddServiceAsync addService = (AddServiceAsync) GWT.create(AddService.class); ServiceDefTarget endpoint = (ServiceDefTarget) addService; String moduleRelativeURL = GWT.getModuleBaseURL() + "myAddService“; endpoint.setServiceEntryPoint(moduleRelativeURL); AsyncCallback callback = new AsyncCallback(){ public void onSuccess(Object result){ resultaatLabel.setText(result.toString()); } public void onFailure(Throwable caught) { resultaatLabel.setText(caught.getMessage()); } }; addService.add(Integer.parseInt(aBox.getText()), Integer.parseInt(bBox.getText()), callback); } } );

  11. In Eclipse: GWT Remote Service

  12. code executed on client side code executed on server side

  13. In Eclipse: GWT Remote Service • Cypal studio maakt zelf Async interface en implementatie klasse aan, en past xml file aan • Implementatie van methodes moet wel zelf voorzien worden • Refresh werkt enkel voor client-side aanpassingen • Bij server-side aanpassingen moet heel de applicatie herstart worden

  14. Meer info • http://code.google.com/docreader/#p=google-web-toolkit-doc-1-5&s=google-web-toolkit-doc-1-5&t=DevGuideRemoteProcedureCalls

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