Examples of FunctionDeferred

com.google.gwt.query.client.plugins.deferred.FunctionDeferred
Utility class used to create customized functions with a deferred execution in pipelined processes. They have access to the associated deferred object via a method which will be called only in the case the previous promise is resolved. We can reuse the function and it will create new promises or will return the last one depending on the value of cache. It is very useful for caching server calls which we just want execute once like login, etc.
```
 Function login = new FunctionDeferred() {
@Override public void f(Deferred dfd) { dfd.resolve("logged in as james-bond at " + new Date()); } }.withCache(RESOLVED); when(login) .then(new Function() { public void f() { String loginMessage = arguments(0); } }); 
```

Examples of com.google.gwt.query.client.plugins.deferred.FunctionDeferred

      .when(new PromiseFunction() {
        public void f(Deferred dfd) {
          dfd.resolve("message");
        }
      })
      .and(new FunctionDeferred() {
          public void f(Deferred dfd) {
            dfd.resolve("then1 " + arguments[0]);
          }
      })
      .then(new FunctionDeferred() {
          public void f(Deferred dfd) {
            dfd.resolve("then2 " + arguments[0]);
          }
      })
      .fail(new Function() {

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Examples of com.google.gwt.query.client.plugins.deferred.FunctionDeferred

      .then(new Function(){
        public void f() {
          // should return the previous value
        }
      })
      .then(new FunctionDeferred() {
          public void f(Deferred dfd) {
            dfd.reject("then2 " + arguments[0]);
          }
      })
      .then(new FunctionDeferred() {
          public void f(Deferred dfd) {
            dfd.resolve("then3 " + arguments[0]);
          }
      })
      .done(new Function() {

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Examples of com.google.gwt.query.client.plugins.deferred.FunctionDeferred

      .when(new PromiseFunction() {
        public void f(Deferred dfd) {
          dfd.reject("reject-when");
        }
      })
      .or(new FunctionDeferred() {
        public void f(Deferred dfd) {
          dfd.reject(arguments[0] + " reject-or1");
        }
      })
      .or(new FunctionDeferred() {
          public void f(Deferred dfd) {
            dfd.reject(arguments[0] + " reject-or2");
          }
      })
      .or(new FunctionDeferred() {
          public void f(Deferred dfd) {
            dfd.resolve(arguments[0] + " resolve-or3");
          }
      })      
      .or(new FunctionDeferred() {
          public void f(Deferred dfd) {
            dfd.resolve(arguments[0] + " or4");
          }
      })      
      .or(new FunctionDeferred() {
        public void f(Deferred dfd) {
          dfd.reject(arguments[0] + " or5");
        }
      })
      .done(new Function() {

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Examples of com.google.gwt.query.client.plugins.deferred.FunctionDeferred

            // in dev-mode when resolve is protected. It works in JRE and production though.
            resolve.f();
          }
        });
      }
    }).then(new FunctionDeferred() {
      protected void f(Deferred dfd) {
        GQuery.when(new Function() {
          public void f() {
            resolve.f();
          }

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Examples of com.google.gwt.query.client.plugins.deferred.FunctionDeferred


  private Boolean deferredData;


  public void testFunctionDeferredCache() {


    FunctionDeferred cachedFunction = new FunctionDeferred() {
      protected void f(Deferred dfd) {
        dfd.resolve(deferredData);
      }
    };


    Function setDeferredDataToTrue = new Function(){
      public void f() {
        deferredData = true;
      }
    };


    Function setDeferredDataToFalse = new Function() {
      public void f() {
        deferredData = false;
      }
    };


    Function assertDeferredDataIsFalse = new Function() {
      public void f() {
        Boolean data = arguments(0);
        assertFalse(data);
      }
    };


    Function assertDeferredDataIsTrue = new Function() {
      public void f() {
        Boolean data = arguments(0);
        assertTrue(data);
      }
    };


    when(setDeferredDataToTrue, cachedFunction.withCache(CacheType.ALL))
      .always(setDeferredDataToFalse)
      .done(assertDeferredDataIsTrue)
      .then(cachedFunction)
      .done(assertDeferredDataIsTrue)
      .then(cachedFunction.withCache(CacheType.REJECTED))
      .done(assertDeferredDataIsFalse)
      .always(setDeferredDataToTrue)
      .then(cachedFunction.withCache(CacheType.RESOLVED))
      .done(assertDeferredDataIsFalse)
      .then(cachedFunction.resetCache())
      .done(assertDeferredDataIsTrue)
      .then(cachedFunction)
      .done(assertDeferredDataIsTrue)
    ;
  }

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