Java - Tips n Tricks

Flow

- Communication object is simple JS Array.

- GWT client layer is invoked by native JS call with array object created by External client application.

- JNSI Object get modified by server (using GWT Async. RPC call).

- Additional external app info’s can also be passed from external app(If required).

Benefits

- Call and communication object is same for all Actions like save, update, any other future operations.

- Hiding the details of internal integration part with GWT.

- Reducing number of native JS object creation.

JavaScript variable:

var arr= new Array()["one","two","three"];

JNSI Call :

private native JSHolderArray getArr()/*-{
return $wnd.arr ;

}-*/;

External JavaScript Object (arr)can be convertible to custom GWT JavaScriptObject to manipulate external script object using GWT JNSI call.

package com.google.gwt.sample.contacts.client;
import com.google.gwt.core.client.JavaScriptObject;
/**
*External javascript array object holder.
*
* @author Hiren
*
*/

public class JSHolderArray extends JavaScriptObject {
protected JSHolderArray() {
}

public final native int length() /*-{
return this.length;
}-*/;

public final native String getOtherData(int index) /*-{
return this[index];
}-*/;

public final native void setOtherData(int index, String data) /*-{
this[index] = data;
}-*/;
}