I can't seem to get my async callback to fire. I don't get it.
What I'm trying to do is get information from a database, through a
server side service (ToolServiceImpl, not shown here as I know it
works) and then use the keys in the resulting HashMap to populate Tab
Bars.
When I execute it, my temporary loading gif loads, everything appears
to execute, I see information from the database calls displaying, but
then onSuccess (or onFailure) never seem to do anything, even when
debugging messages are put in there.
CODE:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta name='gwt:module' content='com.acme.Main=com.acme.Main'>
<title>Main</title>
</head>
<body>
<script language="javascript"
src="com.acme.Main/com.acme.Main.nocache.js"></script>
<h2>Application</h2>
<div id="loading">Loading, please wait....<br/>
<img src="img/ajax-loader.gif" alt="loading">
</div>
<div id="main">
</div>
</body>
</html>
CODE:
package com.acme.client;
import ...;
public class MainEntryPoint implements EntryPoint {
public void onModuleLoad() {
final String tool = "mytool";
ToolBuilder builder = new ToolBuilder(tool);
builder.buildNavigation(new ToolBuildHandler() {
public void onBuilt(Widget widget) {
HorizontalPanel panel = new HorizontalPanel();
panel.add(widget);
RootPanel.get().add(panel);
}
public void onFailure() {
throw new RuntimeException("Loading "+tool+" failed");
}
});
}
}
CODE:
package com.acme.client.tool;
import ...;
import com.acme.client.ToolService;
import com.acme.client.ToolServiceAsync;
public class ToolBuilder {
private final String tool;
public ToolBuilder(String tool) {
this.tool = tool;
}
protected Widget getNavigation(HashMap result) {
String tool = "null";
final HashMap r;
final HashMap ee = new HashMap();
final VerticalPanel mainPanel = new VerticalPanel();
final TabPanel gadgetTabs = new TabPanel();
try {
DOM.setInnerHTML(RootPanel.get("loading").getElement(),
"");
if(tool.equalsIgnoreCase("mytool")) {
r = (HashMap)result;
Iterator it = r.keySet().iterator();
while (it.hasNext()) {
String nameOfObj = (String)it.next();
MyTab myTab = new MyTab();
gadgetTabs.add(myTab, nameOfObj);
}
mainPanel.add(gadgetTabs);
gadgetTabs.addSelectionHandler(new SelectionHandler()
{
public void onSelection(SelectionEvent event) {
// Let the user know what they just did.
Window.alert("You clicked tab " +
event.getSelectedItem());
}
});
}
} catch(Exception e) {
System.out.println("Exception:"+e.toString());
}
return mainPanel;
}
public void buildNavigation(final ToolBuildHandler handler) {
AsyncCallback callback = new AsyncCallback() { // THIS NEVER
APPEARS TO WORK
public void onSuccess(Object result) {
handler.onBuilt(getNavigation((HashMap)result));
}
public void onFailure(Throwable arg0) {
System.out.println("Failed to execute tool");
}
};
getService().myMethod(tool,callback); // THIS WORKS
}
public static ToolServiceAsync getService() {
ToolServiceAsync service = (ToolServiceAsync) GWT.create
(ToolService.class);
ServiceDefTarget endpoint = (ServiceDefTarget) service;
String moduleRelativeURL = GWT.getModuleBaseURL() + "metrics/
toolservice";
endpoint.setServiceEntryPoint(moduleRelativeURL);
return service;
}
}
CODE:
package com.acme.client.tool;
import com.google.gwt.user.client.ui.Widget;
public interface ToolBuildHandler {
public void onBuilt(Widget widget);
public void onFailure();
}
CODE:
package com.acme.client.metrics;
import com.google.gwt.user.client.rpc.AsyncCallback;
public interface ToolServiceAsync {
public void myMethod(String s,AsyncCallback callback);
}
CODE:
package com.acme.client.metrics;
import com.google.gwt.user.client.rpc.RemoteService;
import java.util.HashMap;
public interface ToolService extends RemoteService{
public HashMap myMethod(String s);
}
CODE:
package com.acme.client.tool;
import ...;
public class MyTab extends DeckPanel {
HashMap myHashMap;
public MyTab() {
final Label text = new Label();
Button button = new Button("Click me!");
HTMLTable table = new Grid(5, 5);
for (int row = 0; row < 5; ++row) {
for (int col = 0; col < 5; ++col) {
table.setText(row, col, "" + row + ", " + col);
}
}
button.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
Window.alert("Hello, again");
}
});
}
}
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