ADF | Things not to do in a Component Validator in ADF

Hi,

This a very newbie post that will help new ADF Developers.

In ADF we use component validator to validate any value that Is being posted in the binding layer. This is a very effective way to avoid any garbage post in the Application.

During the development we face many challenges and to meet those challenges we do different types of things.  Sometimes we write codes at inappropriate places which in turn puts an adverse effect on the Applications performance. 

So here are few of the things that should not be done in a Validator of a Component in ADF.

1. Never use the validator to validate the Mandatory field. This is because the validator doesn’t get fired in case of a null value in the component. So sometimes people are expecting a validation in case of null value and it doesn't get fired.
2. Never use database function to do CRUD operation or any kind of CRUD Operation in the Application in a Validator because the Validator runs every time the data is being posted in the binding layer and the update will run many times which will have a negative impact on the database and Application performance.
3. Never use processUpdates  inside a Validator ProcessUpdate updates the value of the component in the binding layer which will actually defeat the purpose of the validator.

Thanks.

Automatic Refresh table data in Oracle ADF

Hi,

Today I am going to post about how we can automatically refresh a table on particular time interval. For this we will be using af:poll component.

Let us start by simply creating a sample application with hr Schema.

And then drop a viewObject as a table on a page.

Here is the page.

Correction : To refresh the table on every refresh we will have to disable the cache from the Table Iterator.[This step can pe skipped].

After that when we run the application.

 After that, we change the data in the database.

Then when a poll is called then the department name Admin changed to Admin New

Here is the code of the Page used in this project.

<af:panelBox text="Sample Auto Table Refresh" id="pb1" showDisclosure="false">
    <f:facet name="toolbar">
      <af:toolbar id="t2">
        <af:selectBooleanCheckbox label="Auto Refresh" id="sbc1"
                                  value="#{viewScope.smplPageRefreshBean.autoRefreshEnabled}"
                                  autoSubmit="true"/>
        <af:inputText label="Refresh Duration" id="it1" contentStyle="width:50px;"
                      value="#{viewScope.smplPageRefreshBean.refreshDuration}" autoSubmit="true"
                      partialTriggers="sbc1" visible="#{viewScope.smplPageRefreshBean.pollOn}"/>
        <af:outputText value="Last Refresh on : #{viewScope.smplPageRefreshBean.lastRefreshedOn}" id="ot5"
                       partialTriggers="sbc1 p1" visible="#{viewScope.smplPageRefreshBean.pollOn}"/>
      </af:toolbar>
    </f:facet>
    <af:panelGroupLayout id="pgl1" layout="vertical">
      <af:poll id="p1" interval="#{viewScope.smplPageRefreshBean.pollDuration}" partialTriggers="sbc1"
               pollListener="#{viewScope.smplPageRefreshBean.pollListner}"/>
      <af:table value="#{bindings.DepartmentsVO1.collectionModel}" var="row" rows="#{bindings.DepartmentsVO1.rangeSize}"
                emptyText="#{bindings.DepartmentsVO1.viewable ? 'No data to display.' : 'Access Denied.'}"
                rowBandingInterval="0" selectedRowKeys="#{bindings.DepartmentsVO1.collectionModel.selectedRow}"
                selectionListener="#{bindings.DepartmentsVO1.collectionModel.makeCurrent}" rowSelection="single"
                fetchSize="#{bindings.DepartmentsVO1.rangeSize}" id="t1" partialTriggers="::sbc1 ::p1" autoHeightRows="10"
                styleClass="AFStretchWidth">
        <af:column headerText="#{bindings.DepartmentsVO1.hints.DeptId.label}" id="c1">
          <af:outputText value="#{row.DeptId}" shortDesc="#{bindings.DepartmentsVO1.hints.DeptId.tooltip}" id="ot1">
            <af:convertNumber groupingUsed="false" pattern="#{bindings.DepartmentsVO1.hints.DeptId.format}"/>
          </af:outputText>
        </af:column>
        <af:column headerText="#{bindings.DepartmentsVO1.hints.DeptNm.label}" id="c2">
          <af:outputText value="#{row.DeptNm}" shortDesc="#{bindings.DepartmentsVO1.hints.DeptNm.tooltip}" id="ot2"/>
        </af:column>
        <af:column headerText="#{bindings.DepartmentsVO1.hints.DeptLoc.label}" id="c3">
          <af:outputText value="#{row.DeptLoc}" shortDesc="#{bindings.DepartmentsVO1.hints.DeptLoc.tooltip}" id="ot3">
            <af:convertNumber groupingUsed="false" pattern="#{bindings.DepartmentsVO1.hints.DeptLoc.format}"/>
          </af:outputText>
        </af:column>
        <af:column headerText="#{bindings.DepartmentsVO1.hints.DeptMngr.label}" id="c4">
          <af:outputText value="#{row.DeptMngr}" shortDesc="#{bindings.DepartmentsVO1.hints.DeptMngr.tooltip}" id="ot4">
            <af:convertNumber groupingUsed="false" pattern="#{bindings.DepartmentsVO1.hints.DeptMngr.format}"/>
          </af:outputText>
        </af:column>
      </af:table>
    </af:panelGroupLayout>

And in the Bean.

package sampleautorefreshtable.adfjavacodes.view.bean;

import java.util.Date;

import javax.faces.application.FacesMessage;

import oracle.adf.model.BindingContext;

import oracle.binding.OperationBinding;

import org.apache.myfaces.trinidad.event.PollEvent;

public class smplPageRefreshBean {
    // To decide if refresh is enabled or not
    private boolean autoRefreshEnabled = false;
    // To decide the last refreshed time
    private Date lastRefreshedOn = new Date(System.currentTimeMillis());
    // To decide refresh time interval in seconds
    private long refreshDuration = 10;
    // To set poll to on or off
    private boolean pollOn = false;

    public boolean isPollOn() {
        return pollOn;
    }

    public smplPageRefreshBean() {
    }

    public void setAutoRefreshEnabled(boolean autoRefreshEnabled) {
        if (autoRefreshEnabled) {
            pollOn = true;
            refreshDuration = 10;
        } else {
            pollOn = false;
        }
        this.autoRefreshEnabled = autoRefreshEnabled;
    }

    public boolean isAutoRefreshEnabled() {
        return autoRefreshEnabled;
    }

    public void setLastRefreshedOn(Date lastRefreshedOn) {
        this.lastRefreshedOn = lastRefreshedOn;
    }

    public Date getLastRefreshedOn() {
        return lastRefreshedOn;
    }

    public void setRefreshDuration(long refreshDuration) {
        this.refreshDuration = refreshDuration;
    }

    public long getRefreshDuration() {
        return refreshDuration;
    }

    public long getPollDuration() {
        return (pollOn ? refreshDuration * 1000 : -1);
    }

    public void pollListner(PollEvent pollEvent) {
        OperationBinding o = BindingContext.getCurrent().getCurrentBindingsEntry().getOperationBinding("Execute");
        o.execute();
        System.out.println("refreshed");
        lastRefreshedOn = new Date(System.currentTimeMillis());
    }
}

You can find the sample project here: SampleAutoRefreshTable

Thanks!

References : http://pamkoertshuis.blogspot.in/2016/01/auto-refresh-op-table-in-adf.html